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SubjectRe: [PATCH v6 5/8] drm: rcar-du: crtc: Control CMM operations
Hi Jacopo,

Thank you for the patch.

On Wed, Oct 16, 2019 at 10:55:45AM +0200, Jacopo Mondi wrote:
> Implement CMM handling in the crtc begin and enable atomic callbacks,
> and enable CMM unit through the Display Extensional Functions
> register at group setup time.
>
> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> ---
> drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 55 +++++++++++++++++++++++++
> drivers/gpu/drm/rcar-du/rcar_du_group.c | 10 +++++
> drivers/gpu/drm/rcar-du/rcar_du_regs.h | 5 +++
> 3 files changed, 70 insertions(+)
>
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> index 23f1d6cc1719..d7ad491577f3 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> @@ -21,6 +21,7 @@
> #include <drm/drm_plane_helper.h>
> #include <drm/drm_vblank.h>
>
> +#include "rcar_cmm.h"
> #include "rcar_du_crtc.h"
> #include "rcar_du_drv.h"
> #include "rcar_du_encoder.h"
> @@ -474,6 +475,45 @@ static void rcar_du_crtc_wait_page_flip(struct rcar_du_crtc *rcrtc)
> rcar_du_crtc_finish_page_flip(rcrtc);
> }
>
> +/* -----------------------------------------------------------------------------
> + * Color Management Module (CMM)
> + */
> +
> +static int rcar_du_cmm_check(struct drm_crtc *crtc,
> + struct drm_crtc_state *state)
> +{
> + struct drm_property_blob *drm_lut = state->gamma_lut;
> + struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
> + struct device *dev = rcrtc->dev->dev;
> +
> + if (!rcrtc->cmm || !drm_lut)

As the gamma LUT property is only created when CMM is present, can't you
drop the first part of this condition ?

> + return 0;
> +
> + /* We only accept fully populated LUT tables. */
> + if (drm_color_lut_size(drm_lut) != CM2_LUT_SIZE) {
> + dev_err(dev, "invalid gamma lut size: %lu bytes\n",
> + drm_lut->length);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static void rcar_du_cmm_setup(struct drm_crtc *crtc)
> +{
> + struct drm_property_blob *drm_lut = crtc->state->gamma_lut;
> + struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
> + struct rcar_cmm_config cmm_config = {};
> +
> + if (!rcrtc->cmm)
> + return;
> +
> + if (drm_lut)
> + cmm_config.lut.table = (struct drm_color_lut *)drm_lut->data;
> +
> + rcar_cmm_setup(rcrtc->cmm, &cmm_config);
> +}
> +
> /* -----------------------------------------------------------------------------
> * Start/Stop and Suspend/Resume
> */
> @@ -619,6 +659,9 @@ static void rcar_du_crtc_stop(struct rcar_du_crtc *rcrtc)
> if (rcar_du_has(rcrtc->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
> rcar_du_vsp_disable(rcrtc);
>
> + if (rcrtc->cmm)
> + rcar_cmm_disable(rcrtc->cmm);
> +
> /*
> * Select switch sync mode. This stops display operation and configures
> * the HSYNC and VSYNC signals as inputs.
> @@ -642,6 +685,11 @@ static int rcar_du_crtc_atomic_check(struct drm_crtc *crtc,
> {
> struct rcar_du_crtc_state *rstate = to_rcar_crtc_state(state);
> struct drm_encoder *encoder;
> + int ret;
> +
> + ret = rcar_du_cmm_check(crtc, state);
> + if (ret)
> + return ret;
>
> /* Store the routes from the CRTC output to the DU outputs. */
> rstate->outputs = 0;
> @@ -667,6 +715,8 @@ static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc,
> struct rcar_du_crtc_state *rstate = to_rcar_crtc_state(crtc->state);
> struct rcar_du_device *rcdu = rcrtc->dev;
>
> + if (rcrtc->cmm)
> + rcar_cmm_enable(rcrtc->cmm);
> rcar_du_crtc_get(rcrtc);
>
> /*
> @@ -686,6 +736,7 @@ static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc,
> }
>
> rcar_du_crtc_start(rcrtc);
> + rcar_du_cmm_setup(crtc);

Let's add a TODO here to figure out why we can't setup CMM before
starting the CRTC.

With these two small issues fixed,

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> }
>
> static void rcar_du_crtc_atomic_disable(struct drm_crtc *crtc,
> @@ -739,6 +790,10 @@ static void rcar_du_crtc_atomic_begin(struct drm_crtc *crtc,
> */
> rcar_du_crtc_get(rcrtc);
>
> + /* If the active state changed, we let .atomic_enable handle CMM. */
> + if (crtc->state->color_mgmt_changed && !crtc->state->active_changed)
> + rcar_du_cmm_setup(crtc);
> +
> if (rcar_du_has(rcrtc->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
> rcar_du_vsp_atomic_begin(rcrtc);
> }
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_group.c b/drivers/gpu/drm/rcar-du/rcar_du_group.c
> index 9eee47969e77..88a783ceb3e9 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_group.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_group.c
> @@ -135,6 +135,7 @@ static void rcar_du_group_setup_didsr(struct rcar_du_group *rgrp)
> static void rcar_du_group_setup(struct rcar_du_group *rgrp)
> {
> struct rcar_du_device *rcdu = rgrp->dev;
> + u32 defr7 = DEFR7_CODE;
>
> /* Enable extended features */
> rcar_du_group_write(rgrp, DEFR, DEFR_CODE | DEFR_DEFE);
> @@ -147,6 +148,15 @@ static void rcar_du_group_setup(struct rcar_du_group *rgrp)
>
> rcar_du_group_setup_pins(rgrp);
>
> + /*
> + * TODO: Handle routing of the DU output to CMM dynamically, as we
> + * should bypass CMM completely when no color management feature is
> + * used.
> + */
> + defr7 |= (rgrp->cmms_mask & BIT(1) ? DEFR7_CMME1 : 0) |
> + (rgrp->cmms_mask & BIT(0) ? DEFR7_CMME0 : 0);
> + rcar_du_group_write(rgrp, DEFR7, defr7);
> +
> if (rcdu->info->gen >= 2) {
> rcar_du_group_setup_defr8(rgrp);
> rcar_du_group_setup_didsr(rgrp);
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_regs.h b/drivers/gpu/drm/rcar-du/rcar_du_regs.h
> index bc87f080b170..fb9964949368 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_regs.h
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_regs.h
> @@ -197,6 +197,11 @@
> #define DEFR6_MLOS1 (1 << 2)
> #define DEFR6_DEFAULT (DEFR6_CODE | DEFR6_TCNE1)
>
> +#define DEFR7 0x000ec
> +#define DEFR7_CODE (0x7779 << 16)
> +#define DEFR7_CMME1 BIT(6)
> +#define DEFR7_CMME0 BIT(4)
> +
> /* -----------------------------------------------------------------------------
> * R8A7790-only Control Registers
> */

--
Regards,

Laurent Pinchart

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