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SubjectRe: [PATCH v7 2/3] drm: Add support for the LogiCVC display controller
Hi,

On Tue 03 Nov 20, 10:46, Maxime Ripard wrote:
> On Mon, Nov 02, 2020 at 04:53:07PM +0100, Paul Kocialkowski wrote:
> > Introduces a driver for the LogiCVC display controller, a programmable
> > logic controller optimized for use in Xilinx Zynq-7000 SoCs and other
> > Xilinx FPGAs. The controller is mostly configured at logic synthesis
> > time so only a subset of configuration is left for the driver to
> > handle.
> >
> > The following features are implemented and tested:
> > - LVDS 4-bit interface;
> > - RGB565 pixel formats;
> > - Multiple layers and hardware composition;
> > - Layer-wide alpha mode;
> >
> > The following features are implemented but untested:
> > - Other RGB pixel formats;
> > - Layer framebuffer configuration for version 4;
> > - Lowest-layer used as background color;
> > - Per-pixel alpha mode.
> >
> > The following features are not implemented:
> > - YUV pixel formats;
> > - DVI, LVDS 3-bit, ITU656 and camera link interfaces;
> > - External parallel input for layer;
> > - Color-keying;
> > - LUT-based alpha modes.
> >
> > Additional implementation-specific notes:
> > - Panels are only enabled after the first page flip to avoid flashing a
> > white screen.
> > - Depth used in context of the LogiCVC driver only counts color components
> > to match the definition of the synthesis parameters.
> >
> > Support is implemented for both version 3 and 4 of the controller.
> >
> > With version 3, framebuffers are stored in a dedicated contiguous
> > memory area, with a base address hardcoded for each layer. This requires
> > using a dedicated CMA pool registered at the base address and tweaking a
> > few offset-related registers to try to use any buffer allocated from
> > the pool. This is done on a best-effort basis to have the hardware cope
> > with the DRM framebuffer allocation model and there is no guarantee
> > that each buffer allocated by GEM CMA can be used for any layer.
> > In particular, buffers allocated below the base address for a layer are
> > guaranteed not to be configurable for that layer. See the implementation of
> > logicvc_layer_buffer_find_setup for specifics.
> >
> > Version 4 allows configuring each buffer address directly, which
> > guarantees that any buffer can be configured.
> >
> > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> > Reviewed-by: Maxime Ripard <mripard@kernel.org>
>
> There's a bunch of checkpatch issues here

Okay, I'll take a look!

> > ---
> > MAINTAINERS | 6 +
> > drivers/gpu/drm/Kconfig | 2 +
> > drivers/gpu/drm/Makefile | 1 +
> > drivers/gpu/drm/logicvc/Kconfig | 9 +
> > drivers/gpu/drm/logicvc/Makefile | 4 +
> > drivers/gpu/drm/logicvc/logicvc_crtc.c | 277 +++++++++
> > drivers/gpu/drm/logicvc/logicvc_crtc.h | 21 +
> > drivers/gpu/drm/logicvc/logicvc_drm.c | 472 +++++++++++++++
> > drivers/gpu/drm/logicvc/logicvc_drm.h | 64 ++
> > drivers/gpu/drm/logicvc/logicvc_interface.c | 224 +++++++
> > drivers/gpu/drm/logicvc/logicvc_interface.h | 30 +
> > drivers/gpu/drm/logicvc/logicvc_layer.c | 615 ++++++++++++++++++++
> > drivers/gpu/drm/logicvc/logicvc_layer.h | 64 ++
> > drivers/gpu/drm/logicvc/logicvc_mode.c | 101 ++++
> > drivers/gpu/drm/logicvc/logicvc_mode.h | 15 +
> > drivers/gpu/drm/logicvc/logicvc_of.c | 197 +++++++
> > drivers/gpu/drm/logicvc/logicvc_of.h | 46 ++
> > drivers/gpu/drm/logicvc/logicvc_regs.h | 88 +++
> > 18 files changed, 2236 insertions(+)
> > create mode 100644 drivers/gpu/drm/logicvc/Kconfig
> > create mode 100644 drivers/gpu/drm/logicvc/Makefile
> > create mode 100644 drivers/gpu/drm/logicvc/logicvc_crtc.c
> > create mode 100644 drivers/gpu/drm/logicvc/logicvc_crtc.h
> > create mode 100644 drivers/gpu/drm/logicvc/logicvc_drm.c
> > create mode 100644 drivers/gpu/drm/logicvc/logicvc_drm.h
> > create mode 100644 drivers/gpu/drm/logicvc/logicvc_interface.c
> > create mode 100644 drivers/gpu/drm/logicvc/logicvc_interface.h
> > create mode 100644 drivers/gpu/drm/logicvc/logicvc_layer.c
> > create mode 100644 drivers/gpu/drm/logicvc/logicvc_layer.h
> > create mode 100644 drivers/gpu/drm/logicvc/logicvc_mode.c
> > create mode 100644 drivers/gpu/drm/logicvc/logicvc_mode.h
> > create mode 100644 drivers/gpu/drm/logicvc/logicvc_of.c
> > create mode 100644 drivers/gpu/drm/logicvc/logicvc_of.h
> > create mode 100644 drivers/gpu/drm/logicvc/logicvc_regs.h
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 71e29dc0ab9d..9c4c5edef0ba 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -5522,6 +5522,12 @@ S: Orphan / Obsolete
> > F: drivers/gpu/drm/i810/
> > F: include/uapi/drm/i810_drm.h
> >
> > +DRM DRIVER FOR LOGICVC DISPLAY CONTROLLER
> > +M: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> > +T: git git://anongit.freedesktop.org/drm/drm-misc
> > +S: Supported
> > +F: drivers/gpu/drm/logicvc/
> > +
>
> Do you have the rights to commit in drm-misc or will you need it?

Yes I think I still have the right to push, but it's probably better if
someone else pushes the series ;)

> > +static int logicvc_crtc_atomic_check(struct drm_crtc *drm_crtc,
> > + struct drm_atomic_state *state)
> > +{
> > + struct drm_crtc_state *crtc_state =
> > + drm_atomic_get_new_crtc_state(state, drm_crtc);
> > + struct drm_display_mode *mode = &crtc_state->adjusted_mode;
> > +
> > + if (mode->flags & DRM_MODE_FLAG_INTERLACE)
> > + return -EINVAL;
> > +
> > + return 0;
> > +}
>
> You probably want to have a mode_valid here to check for this as well,
> it would be weird to expose a mode that we outright reject.

You're right, mode_valid looks like a more appropriate place to check this.

> > +static void logicvc_crtc_atomic_begin(struct drm_crtc *drm_crtc,
> > + struct drm_atomic_state *state)
> > +{
> > + struct logicvc_crtc *crtc = logicvc_crtc(drm_crtc);
> > + struct drm_crtc_state *crtc_state =
> > + drm_atomic_get_old_crtc_state(state, drm_crtc);
> > + struct drm_device *drm_dev = drm_crtc->dev;
> > + unsigned long flags;
> > +
> > + /* Register pending event, only if vblank is already on. */
> > + if (drm_crtc->state->event && crtc_state->active) {
> > + spin_lock_irqsave(&drm_dev->event_lock, flags);
> > + WARN_ON(drm_crtc_vblank_get(drm_crtc) != 0);
> > +
> > + crtc->event = drm_crtc->state->event;
> > + drm_crtc->state->event = NULL;
> > +
> > + spin_unlock_irqrestore(&drm_dev->event_lock, flags);
> > + }
> > +}
>
> That's unusual to do it in atomic_begin, why do you need it?

This is to cover the case where we need to send a page flip event but the
crtc is already on. In that case, neither atomic_enable nor atomic_disable
will be called so we need to rely on atomic_begin to grab that event.
This happens for example when a single plane is updated.

The same thing is done in e.g. sun4i-drm.

> > +static void logicvc_crtc_atomic_enable(struct drm_crtc *drm_crtc,
> > + struct drm_atomic_state *state)
> > +{
> > + struct logicvc_crtc *crtc = logicvc_crtc(drm_crtc);
> > + struct logicvc_drm *logicvc = logicvc_drm(drm_crtc->dev);
> > + struct drm_display_mode *mode = &drm_crtc->state->adjusted_mode;
>
> You should use drm_atomic_get_new_crtc_state here, we're removing the
> direct references of crtc->state to make it more obvious if we're using
> the old or new state.

Okay, will do!

> > + struct drm_crtc_state *crtc_state =
> > + drm_atomic_get_old_crtc_state(state, drm_crtc);
> > + struct drm_device *drm_dev = drm_crtc->dev;
> > + unsigned int hact, hfp, hsl, hbp;
> > + unsigned int vact, vfp, vsl, vbp;
> > + unsigned long flags;
> > + u32 ctrl;
> > +
> > + /* Timings */
> > +
> > + hact = mode->hdisplay;
> > + hfp = mode->hsync_start - mode->hdisplay;
> > + hsl = mode->hsync_end - mode->hsync_start;
> > + hbp = mode->htotal - mode->hsync_end;
> > +
> > + vact = mode->vdisplay;
> > + vfp = mode->vsync_start - mode->vdisplay;
> > + vsl = mode->vsync_end - mode->vsync_start;
> > + vbp = mode->vtotal - mode->vsync_end;
> > +
> > + regmap_write(logicvc->regmap, LOGICVC_HSYNC_FRONT_PORCH_REG, hfp - 1);
> > + regmap_write(logicvc->regmap, LOGICVC_HSYNC_REG, hsl - 1);
> > + regmap_write(logicvc->regmap, LOGICVC_HSYNC_BACK_PORCH_REG, hbp - 1);
> > + regmap_write(logicvc->regmap, LOGICVC_HRES_REG, hact - 1);
> > +
> > + regmap_write(logicvc->regmap, LOGICVC_VSYNC_FRONT_PORCH_REG, vfp - 1);
> > + regmap_write(logicvc->regmap, LOGICVC_VSYNC_REG, vsl - 1);
> > + regmap_write(logicvc->regmap, LOGICVC_VSYNC_BACK_PORCH_REG, vbp - 1);
> > + regmap_write(logicvc->regmap, LOGICVC_VRES_REG, vact - 1);
> > +
> > + /* Signals */
> > +
> > + ctrl = LOGICVC_CTRL_HSYNC_ENABLE | LOGICVC_CTRL_VSYNC_ENABLE |
> > + LOGICVC_CTRL_DE_ENABLE;
> > +
> > + if (mode->flags & DRM_MODE_FLAG_NHSYNC)
> > + ctrl |= LOGICVC_CTRL_HSYNC_INVERT;
> > +
> > + if (mode->flags & DRM_MODE_FLAG_NVSYNC)
> > + ctrl |= LOGICVC_CTRL_VSYNC_INVERT;
> > +
> > + if (logicvc->interface) {
> > + struct drm_connector *connector =
> > + &logicvc->interface->drm_connector;
> > + struct drm_display_info *display_info =
> > + &connector->display_info;
> > +
> > + if (display_info->bus_flags & DRM_BUS_FLAG_DE_LOW)
> > + ctrl |= LOGICVC_CTRL_DE_INVERT;
> > +
> > + if (display_info->bus_flags &
> > + DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
> > + ctrl |= LOGICVC_CTRL_CLOCK_INVERT;
> > + }
> > +
> > + regmap_update_bits(logicvc->regmap, LOGICVC_CTRL_REG,
> > + LOGICVC_CTRL_HSYNC_ENABLE |
> > + LOGICVC_CTRL_HSYNC_INVERT |
> > + LOGICVC_CTRL_VSYNC_ENABLE |
> > + LOGICVC_CTRL_VSYNC_INVERT |
> > + LOGICVC_CTRL_DE_ENABLE |
> > + LOGICVC_CTRL_DE_INVERT |
> > + LOGICVC_CTRL_PIXEL_INVERT |
> > + LOGICVC_CTRL_CLOCK_INVERT, ctrl);
> > +
> > + /* Generate internal state reset. */
> > + regmap_write(logicvc->regmap, LOGICVC_DTYPE_REG, 0);
> > +
> > + drm_crtc_vblank_on(drm_crtc);
> > +
> > + /* Register our event after vblank is enabled. */
> > + if (drm_crtc->state->event && !crtc_state->active) {
> > + spin_lock_irqsave(&drm_dev->event_lock, flags);
> > + WARN_ON(drm_crtc_vblank_get(drm_crtc) != 0);
> > +
> > + crtc->event = drm_crtc->state->event;
> > + drm_crtc->state->event = NULL;
> > + spin_unlock_irqrestore(&drm_dev->event_lock, flags);
> > + }
>
> Haven't you done that in atomic_begin already?

No, atomic_begin grabs a page flip event when the CRTC is already enabled.
This will grab it when the CRTC was previously disabled and we are now
enabling it. Maybe both cases could be merged into atomic_begin since it's
called in both situations.

> > +}
> > +
> > +static void logicvc_crtc_atomic_disable(struct drm_crtc *drm_crtc,
> > + struct drm_atomic_state *state)
> > +{
> > + struct logicvc_drm *logicvc = logicvc_drm(drm_crtc->dev);
> > + struct drm_device *drm_dev = drm_crtc->dev;
> > +
> > + drm_crtc_vblank_off(drm_crtc);
> > +
> > + /* Disable and clear CRTC bits. */
> > + regmap_update_bits(logicvc->regmap, LOGICVC_CTRL_REG,
> > + LOGICVC_CTRL_HSYNC_ENABLE |
> > + LOGICVC_CTRL_HSYNC_INVERT |
> > + LOGICVC_CTRL_VSYNC_ENABLE |
> > + LOGICVC_CTRL_VSYNC_INVERT |
> > + LOGICVC_CTRL_DE_ENABLE |
> > + LOGICVC_CTRL_DE_INVERT |
> > + LOGICVC_CTRL_PIXEL_INVERT |
> > + LOGICVC_CTRL_CLOCK_INVERT, 0);
> > +
> > + /* Generate internal state reset. */
> > + regmap_write(logicvc->regmap, LOGICVC_DTYPE_REG, 0);
> > +
> > + /* Consume leftover event since vblank is now disabled. */
> > + if (drm_crtc->state->event && !drm_crtc->state->active) {
> > + spin_lock_irq(&drm_dev->event_lock);
> > +
> > + drm_crtc_send_vblank_event(drm_crtc, drm_crtc->state->event);
> > + drm_crtc->state->event = NULL;
> > + spin_unlock_irq(&drm_dev->event_lock);
> > + }
>
> And here too. It's definitely worth explaining in the commit log and /
> or comments what you're trying to address.

Well, there are already comments there but maybe the one in atomic_begin would
need more details to be explicit. In any case, the three blocks cover the
three distinct cases that can happen:
- page flip is requested and CRTC was already enabled
- page flip is requested and CRTC is getting enabled
- page flip is requested and CRTC is getting disabled

> > +}
> > +
> > +static const struct drm_crtc_helper_funcs logicvc_crtc_helper_funcs = {
> > + .atomic_check = logicvc_crtc_atomic_check,
> > + .atomic_begin = logicvc_crtc_atomic_begin,
> > + .atomic_enable = logicvc_crtc_atomic_enable,
> > + .atomic_disable = logicvc_crtc_atomic_disable,
> > +};
> > +
> > +static int logicvc_crtc_enable_vblank(struct drm_crtc *drm_crtc)
> > +{
> > + struct logicvc_drm *logicvc = logicvc_drm(drm_crtc->dev);
> > +
> > + /* Clear any pending V_SYNC interrupt. */
> > + regmap_write_bits(logicvc->regmap, LOGICVC_INT_STAT_REG,
> > + LOGICVC_INT_STAT_V_SYNC, LOGICVC_INT_STAT_V_SYNC);
> > +
> > + /* Unmask V_SYNC interrupt. */
> > + regmap_write_bits(logicvc->regmap, LOGICVC_INT_MASK_REG,
> > + LOGICVC_INT_MASK_V_SYNC, 0);
> > +
> > + return 0;
> > +}
> > +
> > +static void logicvc_crtc_disable_vblank(struct drm_crtc *drm_crtc)
> > +{
> > + struct logicvc_drm *logicvc = logicvc_drm(drm_crtc->dev);
> > +
> > + /* Mask V_SYNC interrupt. */
> > + regmap_write_bits(logicvc->regmap, LOGICVC_INT_MASK_REG,
> > + LOGICVC_INT_MASK_V_SYNC, LOGICVC_INT_MASK_V_SYNC);
> > +}
> > +
> > +static const struct drm_crtc_funcs logicvc_crtc_funcs = {
> > + .reset = drm_atomic_helper_crtc_reset,
> > + .destroy = drm_crtc_cleanup,
> > + .set_config = drm_atomic_helper_set_config,
> > + .page_flip = drm_atomic_helper_page_flip,
> > + .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
> > + .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
> > + .enable_vblank = logicvc_crtc_enable_vblank,
> > + .disable_vblank = logicvc_crtc_disable_vblank,
> > +};
> > +
> > +void logicvc_crtc_vblank_handler(struct logicvc_drm *logicvc)
> > +{
> > + struct drm_device *drm_dev = &logicvc->drm_dev;
> > + struct logicvc_crtc *crtc = logicvc->crtc;
> > + unsigned long flags;
> > +
> > + if (!crtc)
> > + return;
> > +
> > + drm_crtc_handle_vblank(&crtc->drm_crtc);
> > +
> > + if (crtc->event) {
> > + spin_lock_irqsave(&drm_dev->event_lock, flags);
> > + drm_crtc_send_vblank_event(&crtc->drm_crtc, crtc->event);
> > + drm_crtc_vblank_put(&crtc->drm_crtc);
> > + crtc->event = NULL;
> > + spin_unlock_irqrestore(&drm_dev->event_lock, flags);
> > + }
> > +}
> > +
> > +int logicvc_crtc_init(struct logicvc_drm *logicvc)
> > +{
> > + struct drm_device *drm_dev = &logicvc->drm_dev;
> > + struct device *dev = drm_dev->dev;
> > + struct device_node *of_node = dev->of_node;
> > + struct logicvc_crtc *crtc;
> > + struct logicvc_layer *layer_primary;
> > + int ret;
> > +
> > + crtc = devm_kzalloc(dev, sizeof(*crtc), GFP_KERNEL);
> > + if (!crtc)
> > + return -ENOMEM;
> > +
> > + layer_primary = logicvc_layer_get_primary(logicvc);
> > + if (!layer_primary) {
> > + DRM_ERROR("Failed to get primary layer\n");
> > + return -EINVAL;
> > + }
> > +
> > + ret = drm_crtc_init_with_planes(drm_dev, &crtc->drm_crtc,
> > + &layer_primary->drm_plane, NULL,
> > + &logicvc_crtc_funcs, NULL);
> > + if (ret) {
> > + DRM_ERROR("Failed to initalize CRTC\n");
> > + return ret;
> > + }
> > +
> > + drm_crtc_helper_add(&crtc->drm_crtc, &logicvc_crtc_helper_funcs);
> > +
> > + crtc->drm_crtc.port = of_graph_get_port_by_id(of_node, 1);
> > +
> > + logicvc->crtc = crtc;
> > +
> > + return 0;
> > +}
> > diff --git a/drivers/gpu/drm/logicvc/logicvc_crtc.h b/drivers/gpu/drm/logicvc/logicvc_crtc.h
> > new file mode 100644
> > index 000000000000..6a1291c37704
> > --- /dev/null
> > +++ b/drivers/gpu/drm/logicvc/logicvc_crtc.h
> > @@ -0,0 +1,21 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ */
> > +/*
> > + * Copyright (C) 2019 Bootlin
> > + * Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> > + */
> > +
> > +#ifndef _LOGICVC_CRTC_H_
> > +#define _LOGICVC_CRTC_H_
> > +
> > +struct drm_pending_vblank_event;
> > +struct logicvc_drm;
> > +
> > +struct logicvc_crtc {
> > + struct drm_crtc drm_crtc;
> > + struct drm_pending_vblank_event *event;
> > +};
> > +
> > +void logicvc_crtc_vblank_handler(struct logicvc_drm *logicvc);
> > +int logicvc_crtc_init(struct logicvc_drm *logicvc);
> > +
> > +#endif
> > diff --git a/drivers/gpu/drm/logicvc/logicvc_drm.c b/drivers/gpu/drm/logicvc/logicvc_drm.c
> > new file mode 100644
> > index 000000000000..b73e92fb2026
> > --- /dev/null
> > +++ b/drivers/gpu/drm/logicvc/logicvc_drm.c
> > @@ -0,0 +1,472 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright (C) 2019 Bootlin
> > + * Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> > + */
> > +
> > +#include <linux/clk.h>
> > +#include <linux/mfd/syscon.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/of_address.h>
> > +#include <linux/of_device.h>
> > +#include <linux/of_reserved_mem.h>
> > +#include <linux/regmap.h>
> > +#include <linux/types.h>
> > +
> > +#include <drm/drm_atomic_helper.h>
> > +#include <drm/drm_drv.h>
> > +#include <drm/drm_fb_helper.h>
> > +#include <drm/drm_gem_cma_helper.h>
> > +#include <drm/drm_print.h>
> > +
> > +#include "logicvc_crtc.h"
> > +#include "logicvc_drm.h"
> > +#include "logicvc_interface.h"
> > +#include "logicvc_mode.h"
> > +#include "logicvc_layer.h"
> > +#include "logicvc_of.h"
> > +#include "logicvc_regs.h"
> > +
> > +DEFINE_DRM_GEM_CMA_FOPS(logicvc_drm_fops);
> > +
> > +static int logicvc_drm_gem_cma_dumb_create(struct drm_file *file_priv,
> > + struct drm_device *drm_dev,
> > + struct drm_mode_create_dumb *args)
> > +{
> > + struct logicvc_drm *logicvc = logicvc_drm(drm_dev);
> > +
> > + /* Stride is always fixed to its configuration value. */
> > + args->pitch = logicvc->config.row_stride * DIV_ROUND_UP(args->bpp, 8);
> > +
> > + return drm_gem_cma_dumb_create_internal(file_priv, drm_dev, args);
> > +}
> > +
> > +static struct drm_driver logicvc_drm_driver = {
> > + .driver_features = DRIVER_GEM | DRIVER_MODESET |
> > + DRIVER_ATOMIC,
> > +
> > + .fops = &logicvc_drm_fops,
> > + .name = "logicvc-drm",
> > + .desc = "Xylon LogiCVC DRM driver",
> > + .date = "20200403",
> > + .major = 1,
> > + .minor = 0,
> > +
> > + DRM_GEM_CMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE(logicvc_drm_gem_cma_dumb_create),
> > +};
> > +
> > +static struct regmap_config logicvc_drm_regmap_config = {
> > + .reg_bits = 32,
> > + .val_bits = 32,
> > + .reg_stride = 4,
> > + .name = "logicvc-drm",
> > +};
> > +
> > +static irqreturn_t logicvc_drm_irq_handler(int irq, void *data)
> > +{
> > + struct logicvc_drm *logicvc = data;
> > + irqreturn_t ret = IRQ_NONE;
> > + u32 stat = 0;
> > +
> > + /* Get pending interrupt sources. */
> > + regmap_read(logicvc->regmap, LOGICVC_INT_STAT_REG, &stat);
> > +
> > + /* Clear all pending interrupt sources. */
> > + regmap_write(logicvc->regmap, LOGICVC_INT_STAT_REG, stat);
> > +
> > + if (stat & LOGICVC_INT_STAT_V_SYNC) {
> > + logicvc_crtc_vblank_handler(logicvc);
> > + ret = IRQ_HANDLED;
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +static int logicvc_drm_config_parse(struct logicvc_drm *logicvc)
> > +{
> > + struct drm_device *drm_dev = &logicvc->drm_dev;
> > + struct device *dev = drm_dev->dev;
> > + struct device_node *of_node = dev->of_node;
> > + struct logicvc_drm_config *config = &logicvc->config;
> > + struct device_node *layers_node;
> > + int ret;
> > +
> > + logicvc_of_property_parse_bool(of_node, LOGICVC_OF_PROPERTY_DITHERING,
> > + &config->dithering);
> > + logicvc_of_property_parse_bool(of_node,
> > + LOGICVC_OF_PROPERTY_BACKGROUND_LAYER,
> > + &config->background_layer);
> > + logicvc_of_property_parse_bool(of_node,
> > + LOGICVC_OF_PROPERTY_LAYERS_CONFIGURABLE,
> > + &config->layers_configurable);
> > +
> > + ret = logicvc_of_property_parse_u32(of_node,
> > + LOGICVC_OF_PROPERTY_DISPLAY_INTERFACE,
> > + &config->display_interface);
> > + if (ret)
> > + return ret;
> > +
> > + ret = logicvc_of_property_parse_u32(of_node,
> > + LOGICVC_OF_PROPERTY_DISPLAY_COLORSPACE,
> > + &config->display_colorspace);
> > + if (ret)
> > + return ret;
> > +
> > + ret = logicvc_of_property_parse_u32(of_node,
> > + LOGICVC_OF_PROPERTY_DISPLAY_DEPTH,
> > + &config->display_depth);
> > + if (ret)
> > + return ret;
> > +
> > + ret = logicvc_of_property_parse_u32(of_node,
> > + LOGICVC_OF_PROPERTY_ROW_STRIDE,
> > + &config->row_stride);
> > + if (ret)
> > + return ret;
> > +
> > + layers_node = of_get_child_by_name(of_node, "layers");
> > + if (!layers_node) {
> > + DRM_ERROR("Missing non-optional layers node\n");
> > + return -EINVAL;
> > + }
> > +
> > + config->layers_count = of_get_child_count(layers_node);
> > + if (!config->layers_count) {
> > + DRM_ERROR("Missing a non-optional layers children node\n");
> > + return -EINVAL;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static void logicvc_version_print(struct logicvc_drm *logicvc)
> > +{
> > + u32 version;
> > +
> > + regmap_read(logicvc->regmap, LOGICVC_IP_VERSION_REG, &version);
> > +
> > + DRM_INFO("LogiCVC version %d.%02d.%c\n",
> > + (int)LOGICVC_FIELD_GET(LOGICVC_IP_VERSION_MAJOR, version),
> > + (int)LOGICVC_FIELD_GET(LOGICVC_IP_VERSION_MINOR, version),
> > + (char)LOGICVC_FIELD_GET(LOGICVC_IP_VERSION_LEVEL, version) +
> > + 'a');
>
> DRM_DEV_INFO?

Okay but now according to Sam, "DRM_DEV_ERROR() and friends are deprecated"
so I wonder which is the right one to use at this point.

> > +}
> > +
> > +static int logicvc_clocks_prepare(struct logicvc_drm *logicvc)
> > +{
> > + struct drm_device *drm_dev = &logicvc->drm_dev;
> > + struct device *dev = drm_dev->dev;
> > +
> > + struct {
> > + struct clk **clk;
> > + char *name;
> > + bool optional;
> > + } clocks_map[] = {
> > + {
> > + .clk = &logicvc->vclk,
> > + .name = "vclk",
> > + .optional = false,
> > + },
> > + {
> > + .clk = &logicvc->vclk2,
> > + .name = "vclk2",
> > + .optional = true,
> > + },
> > + {
> > + .clk = &logicvc->lvdsclk,
> > + .name = "lvdsclk",
> > + .optional = true,
> > + },
> > + {
> > + .clk = &logicvc->lvdsclkn,
> > + .name = "lvdsclkn",
> > + .optional = true,
> > + },
> > + };
> > + unsigned int i;
> > + int ret;
> > +
> > + for (i = 0; i < ARRAY_SIZE(clocks_map); i++) {
> > + struct clk *clk;
> > +
> > + clk = devm_clk_get(dev, clocks_map[i].name);
> > + if (IS_ERR(clk)) {
> > + if (PTR_ERR(clk) == -ENOENT && clocks_map[i].optional)
> > + continue;
> > +
> > + DRM_ERROR("Missing non-optional clock %s\n",
> > + clocks_map[i].name);
> > +
> > + ret = PTR_ERR(clk);
> > + goto error;
> > + }
> > +
> > + ret = clk_prepare_enable(clk);
> > + if (ret) {
> > + DRM_ERROR("Failed to prepare and enable clock %s\n",
> > + clocks_map[i].name);
> > + goto error;
> > + }
> > +
> > + *clocks_map[i].clk = clk;
> > + }
> > +
> > + return 0;
> > +
> > +error:
> > + for (i = 0; i < ARRAY_SIZE(clocks_map); i++) {
> > + if (!*clocks_map[i].clk)
> > + continue;
> > +
> > + clk_disable_unprepare(*clocks_map[i].clk);
> > + *clocks_map[i].clk = NULL;
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +static int logicvc_clocks_unprepare(struct logicvc_drm *logicvc)
> > +{
> > + struct clk **clocks[] = {
> > + &logicvc->vclk,
> > + &logicvc->vclk2,
> > + &logicvc->lvdsclk,
> > + &logicvc->lvdsclkn,
> > + };
> > + unsigned int i;
> > +
> > + for (i = 0; i < ARRAY_SIZE(clocks); i++) {
> > + if (!*clocks[i])
> > + continue;
> > +
> > + clk_disable_unprepare(*clocks[i]);
> > + *clocks[i] = NULL;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int logicvc_drm_probe(struct platform_device *pdev)
> > +{
> > + struct device_node *of_node = pdev->dev.of_node;
> > + struct device_node *reserved_mem_node;
> > + struct reserved_mem *reserved_mem = NULL;
> > + const struct logicvc_drm_caps *caps;
> > + struct logicvc_drm *logicvc;
> > + struct device *dev = &pdev->dev;
> > + struct drm_device *drm_dev;
> > + struct regmap *regmap;
> > + struct resource res;
> > + void __iomem *base;
> > + int irq;
> > + int ret;
> > +
> > + caps = of_device_get_match_data(dev);
> > + if (!caps)
> > + return -EINVAL;
> > +
> > + ret = of_reserved_mem_device_init(dev);
> > + if (ret && ret != -ENODEV) {
> > + dev_err(dev, "Failed to init memory region\n");
> > + goto error_early;
> > + }
> > +
> > + reserved_mem_node = of_parse_phandle(of_node, "memory-region", 0);
> > + if (reserved_mem_node) {
> > + reserved_mem = of_reserved_mem_lookup(reserved_mem_node);
> > + of_node_put(reserved_mem_node);
> > + }
> > +
> > + /* Get regmap from syscon first if available. */
> > + regmap = syscon_regmap_lookup_by_phandle(of_node, "xylon,syscon");
> > +
> > + /* Then get regmap from parent if available. */
> > + if (IS_ERR(regmap) && of_node->parent)
> > + regmap = syscon_node_to_regmap(of_node->parent);
> > +
> > + /* Register our own regmap otherwise. */
> > + if (IS_ERR(regmap)) {
> > + ret = of_address_to_resource(of_node, 0, &res);
> > + if (ret) {
> > + dev_err(dev, "Failed to get resource from address\n");
> > + goto error_reserved_mem;
> > + }
> > +
> > + base = devm_ioremap_resource(dev, &res);
> > + if (IS_ERR(base)) {
> > + dev_err(dev, "Failed to map I/O base\n");
> > + ret = PTR_ERR(base);
> > + goto error_reserved_mem;
> > + }
> > +
> > + logicvc_drm_regmap_config.max_register = resource_size(&res) -
> > + 4;
> > +
> > + regmap = devm_regmap_init_mmio(dev, base,
> > + &logicvc_drm_regmap_config);
> > + if (IS_ERR(regmap)) {
> > + dev_err(dev, "Failed to create regmap for I/O\n");
> > + ret = PTR_ERR(regmap);
> > + goto error_reserved_mem;
> > + }
> > + }
> > +
> > + irq = platform_get_irq(pdev, 0);
> > + if (irq < 0) {
> > + dev_err(dev, "Failed to get IRQ\n");
> > + ret = -ENODEV;
> > + goto error_reserved_mem;
> > + }
> > +
> > + logicvc = devm_drm_dev_alloc(dev, &logicvc_drm_driver,
> > + struct logicvc_drm, drm_dev);
> > + if (IS_ERR(logicvc)) {
> > + ret = PTR_ERR(logicvc);
> > + goto error_reserved_mem;
> > + }
> > +
> > + platform_set_drvdata(pdev, logicvc);
> > + drm_dev = &logicvc->drm_dev;
> > +
> > + logicvc->caps = caps;
> > + logicvc->regmap = regmap;
> > + INIT_LIST_HEAD(&logicvc->layers_list);
> > +
> > + if (reserved_mem)
> > + logicvc->reserved_mem_base = reserved_mem->base;
> > +
> > + ret = logicvc_clocks_prepare(logicvc);
> > + if (ret) {
> > + drm_err(drm_dev, "Failed to prepare clocks\n");
> > + goto error_logicvc;
> > + }
> > +
> > + ret = devm_request_irq(dev, irq, logicvc_drm_irq_handler, 0,
> > + dev_name(dev), logicvc);
> > + if (ret) {
> > + drm_err(drm_dev, "Failed to request IRQ\n");
> > + goto error_clocks;
> > + }
>
> have you considered drm_irq_install?

I did and concluded that there is no particular advantage in using that,
only unnecessary code overhead. But maybe I'm missing something here.

> > +
> > + logicvc_version_print(logicvc);
> > +
> > + ret = logicvc_drm_config_parse(logicvc);
> > + if (ret && ret != -ENODEV) {
> > + drm_err(drm_dev, "Failed to parse config\n");
> > + goto error_clocks;
> > + }
> > +
> > + drm_mode_config_init(drm_dev);
>
> You're supposed to call drm_mode_config_cleanup when using
> drm_mode_config_init. You'd be better off switching to
> drmm_mode_config_init though.

Okay I'll look into it.

> > + ret = logicvc_layers_init(logicvc);
> > + if (ret) {
> > + drm_err(drm_dev, "Failed to initialize layers\n");
> > + goto error_clocks;
> > + }
> > +
> > + ret = logicvc_crtc_init(logicvc);
> > + if (ret) {
> > + drm_err(drm_dev, "Failed to initialize CRTC\n");
> > + goto error_clocks;
> > + }
> > +
> > + logicvc_layers_attach_crtc(logicvc);
> > +
> > + ret = logicvc_interface_init(logicvc);
> > + if (ret) {
> > + if (ret != -EPROBE_DEFER)
> > + drm_err(drm_dev, "Failed to initialize interface\n");
> > +
> > + goto error_clocks;
> > + }
> > +
> > + logicvc_interface_attach_crtc(logicvc);
> > +
> > + ret = logicvc_mode_init(logicvc);
> > + if (ret) {
> > + drm_err(drm_dev, "Failed to initialize KMS\n");
> > + goto error_clocks;
> > + }
> > +
> > + ret = drm_dev_register(drm_dev, 0);
> > + if (ret) {
> > + drm_err(drm_dev, "Failed to register DRM device\n");
> > + goto error_mode;
> > + }
> > +
> > + drm_fbdev_generic_setup(drm_dev, drm_dev->mode_config.preferred_depth);
> > +
> > + return 0;
> > +
> > +error_mode:
> > + logicvc_mode_fini(logicvc);
> > +
> > +error_clocks:
> > + logicvc_clocks_unprepare(logicvc);
> > +
> > +error_logicvc:
> > + drm_dev_put(drm_dev);
>
> You don't need drm_dev_put with devm_drm_dev_alloc

Ah right, thanks.

> > +error_reserved_mem:
> > + of_reserved_mem_device_release(dev);
> > +
> > +error_early:
> > + return ret;
> > +}
> > +
> > +static int logicvc_drm_remove(struct platform_device *pdev)
> > +{
> > + struct logicvc_drm *logicvc = platform_get_drvdata(pdev);
> > + struct device *dev = &pdev->dev;
> > + struct drm_device *drm_dev = &logicvc->drm_dev;
> > +
> > + drm_dev_unregister(drm_dev);
> > + drm_atomic_helper_shutdown(drm_dev);
> > +
> > + logicvc_mode_fini(logicvc);
> > +
> > + logicvc_clocks_unprepare(logicvc);
> > +
> > + drm_dev_put(drm_dev);
>
> Ditto
>
> > + of_reserved_mem_device_release(dev);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct logicvc_drm_caps logicvc_drm_caps_3 = {
> > + .layer_address = false,
> > +};
> > +
> > +static const struct logicvc_drm_caps logicvc_drm_caps_4 = {
> > + .layer_address = true,
> > +};
> > +
> > +static struct of_device_id logicvc_drm_of_table[] = {
> > + {
> > + .compatible = "xylon,logicvc-3.02.a-display",
> > + .data = &logicvc_drm_caps_3,
> > + },
> > + {
> > + .compatible = "xylon,logicvc-4.01.a-display",
> > + .data = &logicvc_drm_caps_4,
> > + },
> > + { },
> > +};
> > +MODULE_DEVICE_TABLE(of, logicvc_drm_of_table);
> > +
> > +static struct platform_driver logicvc_drm_platform_driver = {
> > + .probe = logicvc_drm_probe,
> > + .remove = logicvc_drm_remove,
> > + .driver = {
> > + .name = "logicvc-drm",
> > + .of_match_table = logicvc_drm_of_table,
> > + },
> > +};
> > +
> > +module_platform_driver(logicvc_drm_platform_driver);
> > +
> > +MODULE_AUTHOR("Paul Kocialkowski <paul.kocialkowski@bootlin.com>");
> > +MODULE_DESCRIPTION("Xylon LogiCVC DRM driver");
> > +MODULE_LICENSE("GPL");
> > diff --git a/drivers/gpu/drm/logicvc/logicvc_drm.h b/drivers/gpu/drm/logicvc/logicvc_drm.h
> > new file mode 100644
> > index 000000000000..68bbac6c4ab9
> > --- /dev/null
> > +++ b/drivers/gpu/drm/logicvc/logicvc_drm.h
> > @@ -0,0 +1,64 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ */
> > +/*
> > + * Copyright (C) 2019 Bootlin
> > + * Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> > + */
> > +
> > +#ifndef _LOGICVC_DRM_H_
> > +#define _LOGICVC_DRM_H_
> > +
> > +#include <linux/regmap.h>
> > +#include <linux/types.h>
> > +#include <drm/drm_device.h>
> > +
> > +#define LOGICVC_DISPLAY_INTERFACE_RGB 0
> > +#define LOGICVC_DISPLAY_INTERFACE_ITU656 1
> > +#define LOGICVC_DISPLAY_INTERFACE_LVDS_4BITS 2
> > +#define LOGICVC_DISPLAY_INTERFACE_LVDS_4BITS_CAMERA 3
> > +#define LOGICVC_DISPLAY_INTERFACE_LVDS_3BITS 4
> > +#define LOGICVC_DISPLAY_INTERFACE_DVI 5
> > +
> > +#define LOGICVC_DISPLAY_COLORSPACE_RGB 0
> > +#define LOGICVC_DISPLAY_COLORSPACE_YUV422 1
> > +#define LOGICVC_DISPLAY_COLORSPACE_YUV444 2
> > +
> > +#define logicvc_drm(d) \
> > + container_of(d, struct logicvc_drm, drm_dev)
> > +
> > +struct logicvc_crtc;
> > +struct logicvc_interface;
> > +
> > +struct logicvc_drm_config {
> > + u32 display_interface;
> > + u32 display_colorspace;
> > + u32 display_depth;
> > + u32 row_stride;
> > + bool dithering;
> > + bool background_layer;
> > + bool layers_configurable;
> > + u32 layers_count;
> > +};
> > +
> > +struct logicvc_drm_caps {
> > + bool layer_address;
> > +};
> > +
> > +struct logicvc_drm {
> > + const struct logicvc_drm_caps *caps;
> > + struct logicvc_drm_config config;
> > +
> > + struct drm_device drm_dev;
> > + phys_addr_t reserved_mem_base;
> > + struct regmap *regmap;
> > +
> > + struct clk *vclk;
> > + struct clk *vclk2;
> > + struct clk *lvdsclk;
> > + struct clk *lvdsclkn;
> > +
> > + struct list_head layers_list;
> > + struct logicvc_crtc *crtc;
> > + struct logicvc_interface *interface;
> > +};
> > +
> > +#endif
> > diff --git a/drivers/gpu/drm/logicvc/logicvc_interface.c b/drivers/gpu/drm/logicvc/logicvc_interface.c
> > new file mode 100644
> > index 000000000000..0cfded3792d8
> > --- /dev/null
> > +++ b/drivers/gpu/drm/logicvc/logicvc_interface.c
> > @@ -0,0 +1,224 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright (C) 2019 Bootlin
> > + * Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> > + */
> > +
> > +#include <linux/types.h>
> > +
> > +#include <drm/drm_atomic_helper.h>
> > +#include <drm/drm_bridge.h>
> > +#include <drm/drm_connector.h>
> > +#include <drm/drm_crtc_helper.h>
> > +#include <drm/drm_drv.h>
> > +#include <drm/drm_encoder.h>
> > +#include <drm/drm_gem_cma_helper.h>
> > +#include <drm/drm_modeset_helper_vtables.h>
> > +#include <drm/drm_of.h>
> > +#include <drm/drm_panel.h>
> > +#include <drm/drm_print.h>
> > +#include <drm/drm_probe_helper.h>
> > +
> > +#include "logicvc_crtc.h"
> > +#include "logicvc_drm.h"
> > +#include "logicvc_interface.h"
> > +#include "logicvc_regs.h"
> > +
> > +#define logicvc_interface_from_drm_encoder(c) \
> > + container_of(c, struct logicvc_interface, drm_encoder)
> > +#define logicvc_interface_from_drm_connector(c) \
> > + container_of(c, struct logicvc_interface, drm_connector)
> > +
> > +static void logicvc_encoder_enable(struct drm_encoder *drm_encoder)
> > +{
> > + struct logicvc_drm *logicvc = logicvc_drm(drm_encoder->dev);
> > + struct logicvc_interface *interface =
> > + logicvc_interface_from_drm_encoder(drm_encoder);
> > +
> > + regmap_update_bits(logicvc->regmap, LOGICVC_POWER_CTRL_REG,
> > + LOGICVC_POWER_CTRL_VIDEO_ENABLE,
> > + LOGICVC_POWER_CTRL_VIDEO_ENABLE);
> > +
> > + if (interface->drm_panel) {
> > + drm_panel_prepare(interface->drm_panel);
> > +
> > + /* Encoder enable is too early to enable the panel and a white
> > + * screen will be seen if the panel gets enabled before the
> > + * first page flip is done (and no other framebuffer
> > + * configuration remains from the boot software). */
> > + interface->drm_panel_enabled = false;
> > + }
> > +}
>
> That's fishy (and the similar stuff in commit_tail). Is it because you
> need to have the CRTC powered before the encoder?
>
> If so, you should try the commit_tail_rpm variant, it makes sure the
> CRTC is powered on before making a commit.

No, this is unrelated to CRTC vs encoder enable order. Instead, it's about
panel enable order: I don't want to enable the panel before a buffer was
flipped on the CRTC otherwise a blank/white/garbage screen will be shown.

This is why this drm_panel_enabled variable is used to make sure we don't
enable the panel before.

This is nothing specific to my hardware, but a general concern that probably
exists in every DRM driver. Nobody really seems to care about it but I've
decided that I would in this driver. Now if you think this is too exotic,
I don't mind removing it.

> > +static void logicvc_encoder_disable(struct drm_encoder *drm_encoder)
> > +{
> > + struct logicvc_interface *interface =
> > + logicvc_interface_from_drm_encoder(drm_encoder);
> > +
> > + if (interface->drm_panel) {
> > + drm_panel_disable(interface->drm_panel);
> > + drm_panel_unprepare(interface->drm_panel);
> > + }
> > +}
> > +
> > +static const struct drm_encoder_helper_funcs logicvc_encoder_helper_funcs = {
> > + .enable = logicvc_encoder_enable,
> > + .disable = logicvc_encoder_disable,
> > +};
> > +
> > +static const struct drm_encoder_funcs logicvc_encoder_funcs = {
> > + .destroy = drm_encoder_cleanup,
> > +};
> > +
> > +static int logicvc_connector_get_modes(struct drm_connector *drm_connector)
> > +{
> > + struct logicvc_interface *interface =
> > + logicvc_interface_from_drm_connector(drm_connector);
> > +
> > + if (interface->drm_panel)
> > + return drm_panel_get_modes(interface->drm_panel, drm_connector);
> > + else
> > + WARN_ONCE(1, "Retrieving modes from a native connector is not implemented.");
> > +
> > + return 0;
> > +}
> > +
> > +static const struct drm_connector_helper_funcs logicvc_connector_helper_funcs = {
> > + .get_modes = logicvc_connector_get_modes,
> > +};
> > +
> > +static void logicvc_connector_destroy(struct drm_connector *drm_connector)
> > +{
> > + drm_connector_cleanup(drm_connector);
> > +}
>
> I guess you don't need that intermediate function?

I would need to check if that call is necessary or if some implied mechanism
calls it for me already.

> > +static const struct drm_connector_funcs logicvc_connector_funcs = {
> > + .reset = drm_atomic_helper_connector_reset,
> > + .fill_modes = drm_helper_probe_single_connector_modes,
> > + .destroy = logicvc_connector_destroy,
> > + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> > + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> > +};
> > +
> > +static int logicvc_interface_encoder_type(struct logicvc_drm *logicvc)
> > +{
> > + switch (logicvc->config.display_interface) {
> > + case LOGICVC_DISPLAY_INTERFACE_LVDS_4BITS:
> > + case LOGICVC_DISPLAY_INTERFACE_LVDS_4BITS_CAMERA:
> > + case LOGICVC_DISPLAY_INTERFACE_LVDS_3BITS:
> > + return DRM_MODE_ENCODER_LVDS;
> > + case LOGICVC_DISPLAY_INTERFACE_DVI:
> > + return DRM_MODE_ENCODER_TMDS;
> > + case LOGICVC_DISPLAY_INTERFACE_RGB:
> > + return DRM_MODE_ENCODER_DPI;
> > + default:
> > + return DRM_MODE_ENCODER_NONE;
> > + }
> > +}
> > +
> > +static int logicvc_interface_connector_type(struct logicvc_drm *logicvc)
> > +{
> > + switch (logicvc->config.display_interface) {
> > + case LOGICVC_DISPLAY_INTERFACE_LVDS_4BITS:
> > + case LOGICVC_DISPLAY_INTERFACE_LVDS_4BITS_CAMERA:
> > + case LOGICVC_DISPLAY_INTERFACE_LVDS_3BITS:
> > + return DRM_MODE_CONNECTOR_LVDS;
> > + case LOGICVC_DISPLAY_INTERFACE_DVI:
> > + return DRM_MODE_CONNECTOR_DVID;
> > + case LOGICVC_DISPLAY_INTERFACE_RGB:
> > + return DRM_MODE_CONNECTOR_DPI;
> > + default:
> > + return DRM_MODE_CONNECTOR_Unknown;
> > + }
> > +}
> > +
> > +static bool logicvc_interface_native_connector(struct logicvc_drm *logicvc)
> > +{
> > + switch (logicvc->config.display_interface) {
> > + case LOGICVC_DISPLAY_INTERFACE_DVI:
> > + return true;
> > + default:
> > + return false;
> > + }
> > +}
> > +
> > +void logicvc_interface_attach_crtc(struct logicvc_drm *logicvc)
> > +{
> > + uint32_t possible_crtcs = drm_crtc_mask(&logicvc->crtc->drm_crtc);
> > +
> > + logicvc->interface->drm_encoder.possible_crtcs = possible_crtcs;
> > +}
> > +
> > +int logicvc_interface_init(struct logicvc_drm *logicvc)
> > +{
> > + struct logicvc_interface *interface;
> > + struct drm_device *drm_dev = &logicvc->drm_dev;
> > + struct device *dev = drm_dev->dev;
> > + struct device_node *of_node = dev->of_node;
> > + int encoder_type = logicvc_interface_encoder_type(logicvc);
> > + int connector_type = logicvc_interface_connector_type(logicvc);
> > + bool native_connector = logicvc_interface_native_connector(logicvc);
> > + int ret;
> > +
> > + interface = devm_kzalloc(dev, sizeof(*interface), GFP_KERNEL);
> > + if (!interface) {
> > + ret = -ENOMEM;
> > + goto error_early;
> > + }
> > +
> > + ret = drm_of_find_panel_or_bridge(of_node, 1, 0, &interface->drm_panel,
> > + &interface->drm_bridge);
> > + if (ret == -EPROBE_DEFER)
> > + goto error_early;
> > +
> > + ret = drm_encoder_init(drm_dev, &interface->drm_encoder,
> > + &logicvc_encoder_funcs, encoder_type, NULL);
> > + if (ret) {
> > + drm_err(drm_dev, "Failed to initalize encoder\n");
> > + goto error_early;
> > + }
> > +
> > + drm_encoder_helper_add(&interface->drm_encoder,
> > + &logicvc_encoder_helper_funcs);
> > +
> > + if (native_connector || interface->drm_panel) {
> > + ret = drm_connector_init(drm_dev, &interface->drm_connector,
> > + &logicvc_connector_funcs,
> > + connector_type);
> > + if (ret) {
> > + drm_err(drm_dev, "Failed to initalize connector\n");
> > + goto error_encoder;
> > + }
> > +
> > + drm_connector_helper_add(&interface->drm_connector,
> > + &logicvc_connector_helper_funcs);
> > +
> > + ret = drm_connector_attach_encoder(&interface->drm_connector,
> > + &interface->drm_encoder);
> > + if (ret) {
> > + drm_err(drm_dev,
> > + "Failed to attach connector to encoder\n");
> > + goto error_encoder;
> > + }
> > + }
> > +
> > + if (interface->drm_bridge) {
> > + ret = drm_bridge_attach(&interface->drm_encoder,
> > + interface->drm_bridge, NULL, 0);
> > + if (ret) {
> > + drm_err(drm_dev,
> > + "Failed to attach bridge to encoder\n");
> > + goto error_encoder;
> > + }
> > + }
>
> You should consider using the bridge_or_panel API.

I have considered it and concluded that it's not a good fit given that the
hardware can support a DVI connector.

> > + logicvc->interface = interface;
> > +
> > + return 0;
> > +
> > +error_encoder:
> > + drm_encoder_cleanup(&interface->drm_encoder);
> > +
> > +error_early:
> > + return ret;
> > +}
> > diff --git a/drivers/gpu/drm/logicvc/logicvc_interface.h b/drivers/gpu/drm/logicvc/logicvc_interface.h
> > new file mode 100644
> > index 000000000000..fb2e9e6e04aa
> > --- /dev/null
> > +++ b/drivers/gpu/drm/logicvc/logicvc_interface.h
> > @@ -0,0 +1,30 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ */
> > +/*
> > + * Copyright (C) 2019 Bootlin
> > + * Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> > + */
> > +
> > +#ifndef _LOGICVC_INTERFACE_H_
> > +#define _LOGICVC_INTERFACE_H_
> > +
> > +#include <drm/drm_bridge.h>
> > +#include <drm/drm_connector.h>
> > +#include <drm/drm_encoder.h>
> > +#include <drm/drm_panel.h>
> > +
> > +struct logicvc_drm;
> > +
> > +struct logicvc_interface {
> > + struct drm_encoder drm_encoder;
> > + struct drm_connector drm_connector;
> > +
> > + struct drm_panel *drm_panel;
> > + struct drm_bridge *drm_bridge;
> > +
> > + bool drm_panel_enabled;
> > +};
> > +
> > +void logicvc_interface_attach_crtc(struct logicvc_drm *logicvc);
> > +int logicvc_interface_init(struct logicvc_drm *logicvc);
> > +
> > +#endif
> > diff --git a/drivers/gpu/drm/logicvc/logicvc_layer.c b/drivers/gpu/drm/logicvc/logicvc_layer.c
> > new file mode 100644
> > index 000000000000..9188d45cef77
> > --- /dev/null
> > +++ b/drivers/gpu/drm/logicvc/logicvc_layer.c
> > @@ -0,0 +1,615 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright (C) 2019 Bootlin
> > + * Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> > + */
> > +
> > +#include <linux/of.h>
> > +#include <linux/types.h>
> > +
> > +#include <drm/drm_atomic.h>
> > +#include <drm/drm_atomic_helper.h>
> > +#include <drm/drm_fb_cma_helper.h>
> > +#include <drm/drm_fourcc.h>
> > +#include <drm/drm_plane.h>
> > +#include <drm/drm_plane_helper.h>
> > +#include <drm/drm_print.h>
> > +
> > +#include "logicvc_crtc.h"
> > +#include "logicvc_drm.h"
> > +#include "logicvc_layer.h"
> > +#include "logicvc_of.h"
> > +#include "logicvc_regs.h"
> > +
> > +#define logicvc_layer(p) \
> > + container_of(p, struct logicvc_layer, drm_plane)
> > +
> > +static uint32_t logicvc_layer_formats_rgb16[] = {
> > + DRM_FORMAT_RGB565,
> > + DRM_FORMAT_BGR565,
> > + DRM_FORMAT_INVALID,
> > +};
> > +
> > +static uint32_t logicvc_layer_formats_rgb24[] = {
> > + DRM_FORMAT_XRGB8888,
> > + DRM_FORMAT_XBGR8888,
> > + DRM_FORMAT_INVALID,
> > +};
> > +
> > +/* What we call depth in this driver only counts color components, not alpha.
> > + * This allows us to stay compatible with the LogiCVC bistream definitions. */
> > +static uint32_t logicvc_layer_formats_rgb24_alpha[] = {
> > + DRM_FORMAT_ARGB8888,
> > + DRM_FORMAT_ABGR8888,
> > + DRM_FORMAT_INVALID,
> > +};
> > +
> > +static struct logicvc_layer_formats logicvc_layer_formats[] = {
> > + {
> > + .colorspace = LOGICVC_LAYER_COLORSPACE_RGB,
> > + .depth = 16,
> > + .formats = logicvc_layer_formats_rgb16,
> > + },
> > + {
> > + .colorspace = LOGICVC_LAYER_COLORSPACE_RGB,
> > + .depth = 24,
> > + .formats = logicvc_layer_formats_rgb24,
> > + },
> > + {
> > + .colorspace = LOGICVC_LAYER_COLORSPACE_RGB,
> > + .depth = 24,
> > + .alpha = true,
> > + .formats = logicvc_layer_formats_rgb24_alpha,
> > + },
> > + { }
> > +};
> > +
> > +static bool logicvc_layer_format_inverted(uint32_t format)
> > +{
> > + switch (format) {
> > + case DRM_FORMAT_BGR565:
> > + case DRM_FORMAT_BGR888:
> > + case DRM_FORMAT_XBGR8888:
> > + case DRM_FORMAT_ABGR8888:
> > + return true;
> > + default:
> > + return false;
> > + }
> > +}
> > +
> > +static int logicvc_plane_atomic_check(struct drm_plane *drm_plane,
> > + struct drm_plane_state *state)
> > +{
> > + struct drm_device *drm_dev = drm_plane->dev;
> > + struct logicvc_layer *layer = logicvc_layer(drm_plane);
> > + struct logicvc_drm *logicvc = logicvc_drm(drm_dev);
> > + struct drm_crtc_state *crtc_state;
> > + int min_scale, max_scale;
> > + bool can_position;
> > + int ret;
> > +
> > + if (!state->crtc)
> > + return 0;
> > +
> > + crtc_state = drm_atomic_get_existing_crtc_state(state->state,
> > + state->crtc);
> > + if (WARN_ON(!crtc_state))
> > + return -EINVAL;
> > +
> > + if (state->crtc_x < 0 || state->crtc_y < 0) {
> > + drm_err(drm_dev,
> > + "Negative on-CRTC positions are not supported.\n");
> > + return -EINVAL;
> > + }
> > +
> > + if (!logicvc->caps->layer_address) {
> > + ret = logicvc_layer_buffer_find_setup(logicvc, layer, state,
> > + NULL);
> > + if (ret) {
> > + drm_err(drm_dev, "No viable setup for buffer found.\n");
> > + return ret;
> > + }
> > + }
> > +
> > + min_scale = DRM_PLANE_HELPER_NO_SCALING;
> > + max_scale = DRM_PLANE_HELPER_NO_SCALING;
> > +
> > + can_position = (drm_plane->type == DRM_PLANE_TYPE_OVERLAY &&
> > + layer->index != (logicvc->config.layers_count - 1) &&
> > + logicvc->config.layers_configurable);
> > +
> > + ret = drm_atomic_helper_check_plane_state(state, crtc_state,
> > + min_scale, max_scale,
> > + can_position, true);
> > + if (ret) {
> > + drm_err(drm_dev, "Invalid plane state\n\n");
> > + return ret;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static void logicvc_plane_atomic_update(struct drm_plane *drm_plane,
> > + struct drm_plane_state *old_state)
> > +{
> > + struct logicvc_layer *layer = logicvc_layer(drm_plane);
> > + struct logicvc_drm *logicvc = logicvc_drm(drm_plane->dev);
> > + struct drm_plane_state *state = drm_plane->state;
> > + struct drm_crtc *drm_crtc = &logicvc->crtc->drm_crtc;
> > + struct drm_display_mode *mode = &drm_crtc->state->adjusted_mode;
> > + struct drm_framebuffer *fb = state->fb;
> > + struct logicvc_layer_buffer_setup setup = {};
> > + u32 index = layer->index;
> > + u32 reg;
> > +
> > + /* Layer dimensions */
> > +
> > + regmap_write(logicvc->regmap, LOGICVC_LAYER_WIDTH_REG(index),
> > + state->crtc_w - 1);
> > + regmap_write(logicvc->regmap, LOGICVC_LAYER_HEIGHT_REG(index),
> > + state->crtc_h - 1);
> > +
> > + if (logicvc->caps->layer_address) {
> > + phys_addr_t fb_addr = drm_fb_cma_get_gem_addr(fb, state, 0);
> > +
> > + regmap_write(logicvc->regmap, LOGICVC_LAYER_ADDRESS_REG(index),
> > + fb_addr);
> > + } else {
> > + /* Rely on offsets to configure the address. */
> > +
> > + logicvc_layer_buffer_find_setup(logicvc, layer, state, &setup);
> > +
> > + /* Layer memory offsets */
> > +
> > + regmap_write(logicvc->regmap, LOGICVC_BUFFER_SEL_REG,
> > + LOGICVC_BUFFER_SEL_VALUE(index, setup.buffer_sel));
> > + regmap_write(logicvc->regmap, LOGICVC_LAYER_HOFFSET_REG(index),
> > + setup.hoffset);
> > + regmap_write(logicvc->regmap, LOGICVC_LAYER_VOFFSET_REG(index),
> > + setup.voffset);
> > + }
> > +
> > + /* Layer position */
> > +
> > + regmap_write(logicvc->regmap, LOGICVC_LAYER_HPOSITION_REG(index),
> > + mode->hdisplay - 1 - state->crtc_x);
> > +
> > + /* Vertical position must be set last to sync layer register changes. */
> > + regmap_write(logicvc->regmap, LOGICVC_LAYER_VPOSITION_REG(index),
> > + mode->vdisplay - 1 - state->crtc_y);
> > +
> > + /* Layer alpha */
> > +
> > + if (layer->config.alpha_mode == LOGICVC_LAYER_ALPHA_LAYER) {
> > + u32 alpha_bits;
> > + u32 alpha_max;
> > + u32 alpha;
> > +
> > + switch (layer->config.depth) {
> > + case 8:
> > + alpha_bits = 3;
> > + break;
> > + case 16:
> > + if (layer->config.colorspace == LOGICVC_LAYER_COLORSPACE_YUV)
> > + alpha_bits = 8;
> > + else
> > + alpha_bits = 6;
> > + break;
> > + default:
> > + alpha_bits = 8;
> > + break;
> > + }
> > +
> > + alpha_max = BIT(alpha_bits) - 1;
> > + alpha = state->alpha * alpha_max / DRM_BLEND_ALPHA_OPAQUE;
> > +
> > + DRM_DEBUG_DRIVER("Setting layer %d alpha to %d/%d\n", index,
> > + alpha, alpha_max);
> > +
> > + regmap_write(logicvc->regmap, LOGICVC_LAYER_ALPHA_REG(index),
> > + alpha);
> > + }
> > +
> > + /* Layer control */
> > +
> > + reg = LOGICVC_LAYER_CTRL_ENABLE;
> > +
> > + if (logicvc_layer_format_inverted(fb->format->format))
> > + reg |= LOGICVC_LAYER_CTRL_PIXEL_FORMAT_INVERT;
> > +
> > + reg |= LOGICVC_LAYER_CTRL_COLOR_KEY_DISABLE;
> > +
> > + regmap_write(logicvc->regmap, LOGICVC_LAYER_CTRL_REG(index), reg);
> > +}
> > +
> > +static void logicvc_plane_atomic_disable(struct drm_plane *drm_plane,
> > + struct drm_plane_state *old_state)
> > +{
> > + struct logicvc_layer *layer = logicvc_layer(drm_plane);
> > + struct logicvc_drm *logicvc = logicvc_drm(drm_plane->dev);
> > + u32 index = layer->index;
> > +
> > + regmap_write(logicvc->regmap, LOGICVC_LAYER_CTRL_REG(index), 0);
> > +}
> > +
> > +static struct drm_plane_helper_funcs logicvc_plane_helper_funcs = {
> > + .atomic_check = logicvc_plane_atomic_check,
> > + .atomic_update = logicvc_plane_atomic_update,
> > + .atomic_disable = logicvc_plane_atomic_disable,
> > +};
> > +
> > +static const struct drm_plane_funcs logicvc_plane_funcs = {
> > + .update_plane = drm_atomic_helper_update_plane,
> > + .disable_plane = drm_atomic_helper_disable_plane,
> > + .destroy = drm_plane_cleanup,
> > + .reset = drm_atomic_helper_plane_reset,
> > + .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
> > + .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
> > +};
> > +
> > +int logicvc_layer_buffer_find_setup(struct logicvc_drm *logicvc,
> > + struct logicvc_layer *layer,
> > + struct drm_plane_state *state,
> > + struct logicvc_layer_buffer_setup *setup)
> > +{
> > + struct drm_device *drm_dev = &logicvc->drm_dev;
> > + struct drm_framebuffer *fb = state->fb;
> > + /* All the supported formats have a single data plane. */
> > + u32 layer_bytespp = fb->format->cpp[0];
> > + u32 layer_stride = layer_bytespp * logicvc->config.row_stride;
> > + u32 base_offset = layer->config.base_offset * layer_stride;
> > + u32 buffer_offset = layer->config.buffer_offset * layer_stride;
> > + u8 buffer_sel = 0;
> > + u16 voffset = 0;
> > + u16 hoffset = 0;
> > + phys_addr_t fb_addr;
> > + u32 fb_offset;
> > + u32 gap;
> > +
> > + if (!logicvc->reserved_mem_base) {
> > + drm_err(drm_dev, "No reserved memory base was registered!\n");
> > + return -ENOMEM;
> > + }
> > +
> > + fb_addr = drm_fb_cma_get_gem_addr(fb, state, 0);
> > + if (fb_addr < logicvc->reserved_mem_base) {
> > + drm_err(drm_dev,
> > + "Framebuffer memory below reserved memory base!\n");
> > + return -EINVAL;
> > + }
> > +
> > + fb_offset = (u32) (fb_addr - logicvc->reserved_mem_base);
> > +
> > + if (fb_offset < base_offset) {
> > + drm_err(drm_dev,
> > + "Framebuffer offset below layer base offset!\n");
> > + return -EINVAL;
> > + }
> > +
> > + gap = fb_offset - base_offset;
> > +
> > + /* Use the possible video buffers selection. */
> > + if (gap && buffer_offset) {
> > + buffer_sel = gap / buffer_offset;
> > + if (buffer_sel > LOGICVC_BUFFER_SEL_MAX)
> > + buffer_sel = LOGICVC_BUFFER_SEL_MAX;
> > +
> > + gap -= buffer_sel * buffer_offset;
> > + }
> > +
> > + /* Use the vertical offset. */
> > + if (gap && layer_stride && logicvc->config.layers_configurable) {
> > + voffset = gap / layer_stride;
> > + if (voffset > LOGICVC_LAYER_VOFFSET_MAX)
> > + voffset = LOGICVC_LAYER_VOFFSET_MAX;
> > +
> > + gap -= voffset * layer_stride;
> > + }
> > +
> > + /* Use the horizontal offset. */
> > + if (gap && layer_bytespp && logicvc->config.layers_configurable) {
> > + hoffset = gap / layer_bytespp;
> > + if (hoffset > LOGICVC_DIMENSIONS_MAX)
> > + hoffset = LOGICVC_DIMENSIONS_MAX;
> > +
> > + gap -= hoffset * layer_bytespp;
> > + }
> > +
> > + if (gap) {
> > + drm_err(drm_dev,
> > + "Unable to find layer %d buffer setup for 0x%x byte gap\n",
> > + layer->index, fb_offset - base_offset);
> > + return -EINVAL;
> > + }
> > +
> > + DRM_DEBUG_DRIVER("Found layer %d buffer setup for 0x%x byte gap:\n",
> > + layer->index, fb_offset - base_offset);
> > +
> > + DRM_DEBUG_DRIVER("- buffer_sel = 0x%x chunks of 0x%x bytes\n",
> > + buffer_sel, buffer_offset);
> > + DRM_DEBUG_DRIVER("- voffset = 0x%x chunks of 0x%x bytes\n", voffset,
> > + layer_stride);
> > + DRM_DEBUG_DRIVER("- hoffset = 0x%x chunks of 0x%x bytes\n", hoffset,
> > + layer_bytespp);
> > +
> > + if (setup) {
> > + setup->buffer_sel = buffer_sel;
> > + setup->voffset = voffset;
> > + setup->hoffset = hoffset;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static struct logicvc_layer_formats *logicvc_layer_formats_lookup(struct logicvc_layer *layer)
> > +{
> > + bool alpha;
> > + unsigned int i = 0;
> > +
> > + alpha = (layer->config.alpha_mode == LOGICVC_LAYER_ALPHA_PIXEL);
> > +
> > + while (logicvc_layer_formats[i].formats) {
> > + if (logicvc_layer_formats[i].colorspace == layer->config.colorspace &&
> > + logicvc_layer_formats[i].depth == layer->config.depth &&
> > + logicvc_layer_formats[i].alpha == alpha)
> > + return &logicvc_layer_formats[i];
> > +
> > + i++;
> > + }
> > +
> > + return NULL;
> > +}
> > +
> > +static unsigned int logicvc_layer_formats_count(struct logicvc_layer_formats *formats)
> > +{
> > + unsigned int count = 0;
> > +
> > + while (formats->formats[count] != DRM_FORMAT_INVALID)
> > + count++;
> > +
> > + return count;
> > +}
> > +
> > +static int logicvc_layer_config_parse(struct logicvc_drm *logicvc,
> > + struct logicvc_layer *layer)
> > +{
> > + struct device_node *of_node = layer->of_node;
> > + struct logicvc_layer_config *config = &layer->config;
> > + int ret;
> > +
> > + logicvc_of_property_parse_bool(of_node,
> > + LOGICVC_OF_PROPERTY_LAYER_PRIMARY,
> > + &config->primary);
> > +
> > + ret = logicvc_of_property_parse_u32(of_node,
> > + LOGICVC_OF_PROPERTY_LAYER_COLORSPACE,
> > + &config->colorspace);
> > + if (ret)
> > + return ret;
> > +
> > + ret = logicvc_of_property_parse_u32(of_node,
> > + LOGICVC_OF_PROPERTY_LAYER_DEPTH,
> > + &config->depth);
> > + if (ret)
> > + return ret;
> > +
> > + ret = logicvc_of_property_parse_u32(of_node,
> > + LOGICVC_OF_PROPERTY_LAYER_ALPHA_MODE,
> > + &config->alpha_mode);
> > + if (ret)
> > + return ret;
> > +
> > + /* Memory offset is only relevant without layer address configuration. */
> > + if (logicvc->caps->layer_address)
> > + return 0;
> > +
> > + ret = logicvc_of_property_parse_u32(of_node,
> > + LOGICVC_OF_PROPERTY_LAYER_BASE_OFFSET,
> > + &config->base_offset);
> > + if (ret)
> > + return ret;
> > +
> > + ret = logicvc_of_property_parse_u32(of_node,
> > + LOGICVC_OF_PROPERTY_LAYER_BUFFER_OFFSET,
> > + &config->buffer_offset);
> > + if (ret)
> > + return ret;
> > +
> > + return 0;
> > +}
> > +
> > +struct logicvc_layer *logicvc_layer_get_from_index(struct logicvc_drm *logicvc,
> > + u32 index)
> > +{
> > + struct logicvc_layer *layer;
> > +
> > + list_for_each_entry(layer, &logicvc->layers_list, list)
> > + if (layer->index == index)
> > + return layer;
> > +
> > + return NULL;
> > +}
> > +
> > +struct logicvc_layer *logicvc_layer_get_from_type(struct logicvc_drm *logicvc,
> > + enum drm_plane_type type)
> > +{
> > + struct logicvc_layer *layer;
> > +
> > + list_for_each_entry(layer, &logicvc->layers_list, list)
> > + if (layer->drm_plane.type == type)
> > + return layer;
> > +
> > + return NULL;
> > +}
> > +
> > +struct logicvc_layer *logicvc_layer_get_primary(struct logicvc_drm *logicvc)
> > +{
> > + return logicvc_layer_get_from_type(logicvc, DRM_PLANE_TYPE_PRIMARY);
> > +}
> > +
> > +static int logicvc_layer_init(struct logicvc_drm *logicvc,
> > + struct device_node *of_node, u32 index)
> > +{
> > + struct drm_device *drm_dev = &logicvc->drm_dev;
> > + struct device *dev = drm_dev->dev;
> > + struct logicvc_layer *layer = NULL;
> > + struct logicvc_layer_formats *formats;
> > + unsigned int formats_count;
> > + enum drm_plane_type type;
> > + unsigned int zpos;
> > + int ret;
> > +
> > + layer = devm_kzalloc(dev, sizeof(*layer), GFP_KERNEL);
> > + if (!layer) {
> > + ret = -ENOMEM;
> > + goto error;
> > + }
> > +
> > + layer->of_node = of_node;
> > + layer->index = index;
> > +
> > + ret = logicvc_layer_config_parse(logicvc, layer);
> > + if (ret) {
> > + drm_err(drm_dev, "Failed to parse config for layer #%d\n",
> > + index);
> > + goto error;
> > + }
> > +
> > + formats = logicvc_layer_formats_lookup(layer);
> > + if (!formats) {
> > + drm_err(drm_dev, "Failed to lookup formats for layer #%d\n",
> > + index);
> > + goto error;
> > + }
> > +
> > + formats_count = logicvc_layer_formats_count(formats);
> > +
> > + /* The final layer can be configured as a background layer. */
> > + if (logicvc->config.background_layer &&
> > + index == (logicvc->config.layers_count - 1)) {
> > + /* A zero value for black is only valid for RGB, not for YUV,
> > + * so this will need to take the format in account for YUV. */
> > + u32 background = 0;
> > +
> > + DRM_DEBUG_DRIVER("Using layer #%d as background layer\n",
> > + index);
> > +
> > + regmap_write(logicvc->regmap, LOGICVC_BACKGROUND_COLOR_REG,
> > + background);
> > +
> > + devm_kfree(dev, layer);
> > +
> > + return 0;
> > + }
> > +
> > + if (layer->config.primary)
> > + type = DRM_PLANE_TYPE_PRIMARY;
> > + else
> > + type = DRM_PLANE_TYPE_OVERLAY;
> > +
> > + ret = drm_universal_plane_init(drm_dev, &layer->drm_plane, 0,
> > + &logicvc_plane_funcs, formats->formats,
> > + formats_count, NULL, type, NULL);
> > + if (ret) {
> > + drm_err(drm_dev, "Failed to initialize layer plane\n");
> > + return ret;
> > + }
> > +
> > + drm_plane_helper_add(&layer->drm_plane, &logicvc_plane_helper_funcs);
> > +
> > + zpos = logicvc->config.layers_count - index - 1;
> > + DRM_DEBUG_DRIVER("Giving layer #%d zpos %d\n", index, zpos);
> > +
> > + if (layer->config.alpha_mode == LOGICVC_LAYER_ALPHA_LAYER)
> > + drm_plane_create_alpha_property(&layer->drm_plane);
> > +
> > + drm_plane_create_zpos_immutable_property(&layer->drm_plane, zpos);
> > +
> > + DRM_DEBUG_DRIVER("Registering layer #%d\n", index);
> > +
> > + layer->formats = formats;
> > +
> > + list_add_tail(&layer->list, &logicvc->layers_list);
> > +
> > + return 0;
> > +
> > +error:
> > + if (layer)
> > + devm_kfree(dev, layer);
> > +
> > + return ret;
> > +}
> > +
> > +static void logicvc_layer_fini(struct logicvc_drm *logicvc,
> > + struct logicvc_layer *layer)
> > +{
> > + struct device *dev = logicvc->drm_dev.dev;
> > +
> > + list_del(&layer->list);
> > + devm_kfree(dev, layer);
> > +}
> > +
> > +void logicvc_layers_attach_crtc(struct logicvc_drm *logicvc)
> > +{
> > + uint32_t possible_crtcs = drm_crtc_mask(&logicvc->crtc->drm_crtc);
> > + struct logicvc_layer *layer;
> > +
> > + list_for_each_entry(layer, &logicvc->layers_list, list) {
> > + if (layer->drm_plane.type != DRM_PLANE_TYPE_OVERLAY)
> > + continue;
> > +
> > + layer->drm_plane.possible_crtcs = possible_crtcs;
> > + }
> > +}
> > +
> > +int logicvc_layers_init(struct logicvc_drm *logicvc)
> > +{
> > + struct drm_device *drm_dev = &logicvc->drm_dev;
> > + struct device *dev = drm_dev->dev;
> > + struct device_node *of_node = dev->of_node;
> > + struct device_node *layer_node = NULL;
> > + struct device_node *layers_node;
> > + struct logicvc_layer *layer;
> > + struct logicvc_layer *next;
> > + int ret = 0;
> > +
> > + layers_node = of_get_child_by_name(of_node, "layers");
> > + if (!layers_node) {
> > + DRM_ERROR("No layers node found in the description\n");
> > + ret = -ENODEV;
> > + goto error;
> > + }
> > +
> > + for_each_child_of_node(layers_node, layer_node) {
> > + u32 index = 0;
> > +
> > + if (!logicvc_of_node_is_layer(layer_node))
> > + continue;
> > +
> > + ret = of_property_read_u32(layer_node, "reg", &index);
> > + if (ret)
> > + continue;
> > +
> > + layer = logicvc_layer_get_from_index(logicvc, index);
> > + if (layer) {
> > + DRM_ERROR("Duplicated entry for layer #%d\n", index);
> > + continue;
> > + }
> > +
> > + ret = logicvc_layer_init(logicvc, layer_node, index);
> > + if (ret)
> > + goto error;
> > +
> > + of_node_put(layer_node);
> > + }
> > +
> > + of_node_put(layers_node);
> > +
> > + return 0;
> > +
> > +error:
> > + list_for_each_entry_safe(layer, next, &logicvc->layers_list, list)
> > + logicvc_layer_fini(logicvc, layer);
> > +
> > + return ret;
> > +}
> > diff --git a/drivers/gpu/drm/logicvc/logicvc_layer.h b/drivers/gpu/drm/logicvc/logicvc_layer.h
> > new file mode 100644
> > index 000000000000..c5767c81f446
> > --- /dev/null
> > +++ b/drivers/gpu/drm/logicvc/logicvc_layer.h
> > @@ -0,0 +1,64 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ */
> > +/*
> > + * Copyright (C) 2019 Bootlin
> > + * Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> > + */
> > +
> > +#ifndef _LOGICVC_LAYER_H_
> > +#define _LOGICVC_LAYER_H_
> > +
> > +#include <linux/of.h>
> > +#include <linux/types.h>
> > +#include <drm/drm_plane.h>
> > +
> > +#define LOGICVC_LAYER_COLORSPACE_RGB 0
> > +#define LOGICVC_LAYER_COLORSPACE_YUV 1
> > +
> > +#define LOGICVC_LAYER_ALPHA_LAYER 0
> > +#define LOGICVC_LAYER_ALPHA_PIXEL 1
> > +
> > +struct logicvc_layer_buffer_setup {
> > + u8 buffer_sel;
> > + u16 voffset;
> > + u16 hoffset;
> > +};
> > +
> > +struct logicvc_layer_config {
> > + u32 colorspace;
> > + u32 depth;
> > + u32 alpha_mode;
> > + u32 base_offset;
> > + u32 buffer_offset;
> > + bool primary;
> > +};
> > +
> > +struct logicvc_layer_formats {
> > + u32 colorspace;
> > + u32 depth;
> > + bool alpha;
> > + uint32_t *formats;
> > +};
> > +
> > +struct logicvc_layer {
> > + struct logicvc_layer_config config;
> > + struct logicvc_layer_formats *formats;
> > + struct device_node *of_node;
> > +
> > + struct drm_plane drm_plane;
> > + struct list_head list;
> > + u32 index;
> > +};
> > +
> > +int logicvc_layer_buffer_find_setup(struct logicvc_drm *logicvc,
> > + struct logicvc_layer *layer,
> > + struct drm_plane_state *state,
> > + struct logicvc_layer_buffer_setup *setup);
> > +struct logicvc_layer *logicvc_layer_get_from_index(struct logicvc_drm *logicvc,
> > + u32 index);
> > +struct logicvc_layer *logicvc_layer_get_from_type(struct logicvc_drm *logicvc,
> > + enum drm_plane_type type);
> > +struct logicvc_layer *logicvc_layer_get_primary(struct logicvc_drm *logicvc);
> > +void logicvc_layers_attach_crtc(struct logicvc_drm *logicvc);
> > +int logicvc_layers_init(struct logicvc_drm *logicvc);
> > +
> > +#endif
> > diff --git a/drivers/gpu/drm/logicvc/logicvc_mode.c b/drivers/gpu/drm/logicvc/logicvc_mode.c
> > new file mode 100644
> > index 000000000000..aa8f35b64c75
> > --- /dev/null
> > +++ b/drivers/gpu/drm/logicvc/logicvc_mode.c
> > @@ -0,0 +1,101 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright (C) 2019 Bootlin
> > + * Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> > + */
> > +
> > +#include <linux/types.h>
> > +
> > +#include <drm/drm_atomic.h>
> > +#include <drm/drm_atomic_helper.h>
> > +#include <drm/drm_crtc_helper.h>
> > +#include <drm/drm_drv.h>
> > +#include <drm/drm_fb_cma_helper.h>
> > +#include <drm/drm_fb_helper.h>
> > +#include <drm/drm_gem_cma_helper.h>
> > +#include <drm/drm_gem_framebuffer_helper.h>
> > +#include <drm/drm_mode_config.h>
> > +#include <drm/drm_panel.h>
> > +#include <drm/drm_print.h>
> > +#include <drm/drm_probe_helper.h>
> > +#include <drm/drm_vblank.h>
> > +
> > +#include "logicvc_drm.h"
> > +#include "logicvc_interface.h"
> > +#include "logicvc_layer.h"
> > +#include "logicvc_mode.h"
> > +
> > +static void logicvc_mode_atomic_commit_tail(struct drm_atomic_state *old_state)
> > +{
> > + struct drm_device *drm_dev = old_state->dev;
> > + struct logicvc_drm *logicvc = logicvc_drm(drm_dev);
> > + struct logicvc_interface *interface = logicvc->interface;
> > +
> > + drm_atomic_helper_commit_tail(old_state);
> > +
> > + /* Enable the panel after the first commit, which concerns our panel
> > + * since we only support a single interface. */
> > + if (interface->drm_panel && !interface->drm_panel_enabled) {
> > + drm_panel_enable(interface->drm_panel);
> > + interface->drm_panel_enabled = true;
> > + }
> > +}
> > +
> > +static const struct drm_mode_config_helper_funcs logicvc_mode_config_helper_funcs = {
> > + .atomic_commit_tail = logicvc_mode_atomic_commit_tail,
> > +};
> > +
> > +static const struct drm_mode_config_funcs logicvc_mode_config_funcs = {
> > + .fb_create = drm_gem_fb_create,
> > + .output_poll_changed = drm_fb_helper_output_poll_changed,
> > + .atomic_check = drm_atomic_helper_check,
> > + .atomic_commit = drm_atomic_helper_commit,
> > +};
> > +
> > +int logicvc_mode_init(struct logicvc_drm *logicvc)
> > +{
> > + struct drm_device *drm_dev = &logicvc->drm_dev;
> > + struct drm_mode_config *mode_config = &drm_dev->mode_config;
> > + struct logicvc_layer *layer_primary;
> > + uint32_t preferred_depth;
> > + int ret;
> > +
> > + ret = drm_vblank_init(drm_dev, mode_config->num_crtc);
> > + if (ret) {
> > + drm_err(drm_dev, "Failed to initialize vblank\n");
> > + return ret;
> > + }
> > +
> > + layer_primary = logicvc_layer_get_primary(logicvc);
> > + if (!layer_primary) {
> > + drm_err(drm_dev, "Failed to get primary layer\n");
> > + return -EINVAL;
> > + }
> > +
> > + preferred_depth = layer_primary->formats->depth;
> > +
> > + /* DRM counts alpha in depth, our driver doesn't. */
> > + if (layer_primary->formats->alpha)
> > + preferred_depth += 8;
> > +
> > + mode_config->min_width = 64;
> > + mode_config->max_width = 2048;
> > + mode_config->min_height = 1;
> > + mode_config->max_height = 2048;
> > + mode_config->preferred_depth = preferred_depth;
> > + mode_config->funcs = &logicvc_mode_config_funcs;
> > + mode_config->helper_private = &logicvc_mode_config_helper_funcs;
> > +
> > + drm_mode_config_reset(drm_dev);
> > +
> > + drm_kms_helper_poll_init(drm_dev);
> > +
> > + return 0;
> > +}
> > +
> > +void logicvc_mode_fini(struct logicvc_drm *logicvc)
> > +{
> > + struct drm_device *drm_dev = &logicvc->drm_dev;
> > +
> > + drm_kms_helper_poll_fini(drm_dev);
> > +}
>
> You should consider using a drmm_add_action_or_reset here to simplify
> your error / remove path.

Thanks for the suggestion (and the review)!

Cheers,

Paul

--
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com
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