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Subject[PATCH v1] drm/kms/mode: added a new helper for calculating videomode from crtc's display mode
Date
1.
-Added a new helper drm_display_mode_crtc_to_videomode
-This helper calculates mode parameters like
--horizontal front_porch, back_porch, sync length
--vertical front_porch, back_porch, sync length
-using crtc fields of struct drm_display_mode
-It uses following fields of crtc mode
--horizontal sync start/end, active and total length
--vertical sync start/end, active and total length
2.
-Most of the driver use user-supplied mode for calculating videomode
-However, few drivers use HW (crtc) mode for calculating videomode
-This helper will be useful for such drivers
3.
-Currently following drivers will be using this new helper
-arm hdlcd
-atmel hlcdc
-exynos 5433 decon
-exynos7 decon
-exynos fimd
4.
-This change reduces several redundant lines of code for many drivers

Reviewed-by: Jani Nikula <jani.nikula@linux.intel.com>
Acked-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Satendra Singh Thakur <satendra.t@samsung.com>
Acked-by: Madhur Verma <madhur.verma@samsung.com>
Cc: Hemanshu Srivastava <hemanshu.s@samsung.com>
---

v1: Fixed review comments by Mr Jani
Initialized with 0 the struct videomode so that stack garbage won't come
Added Reviewed-by and Acked-by fields

drivers/gpu/drm/arm/hdlcd_crtc.c | 10 ++--------
drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c | 9 ++-------
drivers/gpu/drm/drm_modes.c | 19 +++++++++++++++++++
drivers/gpu/drm/exynos/exynos5433_drm_decon.c | 22 ++++++++++------------
drivers/gpu/drm/exynos/exynos7_drm_decon.c | 23 ++++++++++-------------
drivers/gpu/drm/exynos/exynos_drm_fimd.c | 22 +++++++++-------------
include/drm/drm_modes.h | 2 ++
7 files changed, 54 insertions(+), 53 deletions(-)

diff --git a/drivers/gpu/drm/arm/hdlcd_crtc.c b/drivers/gpu/drm/arm/hdlcd_crtc.c
index cf5cbd6..5cec264 100644
--- a/drivers/gpu/drm/arm/hdlcd_crtc.c
+++ b/drivers/gpu/drm/arm/hdlcd_crtc.c
@@ -127,16 +127,10 @@ static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
{
struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
struct drm_display_mode *m = &crtc->state->adjusted_mode;
- struct videomode vm;
+ struct videomode vm = {};
unsigned int polarities, err;

- vm.vfront_porch = m->crtc_vsync_start - m->crtc_vdisplay;
- vm.vback_porch = m->crtc_vtotal - m->crtc_vsync_end;
- vm.vsync_len = m->crtc_vsync_end - m->crtc_vsync_start;
- vm.hfront_porch = m->crtc_hsync_start - m->crtc_hdisplay;
- vm.hback_porch = m->crtc_htotal - m->crtc_hsync_end;
- vm.hsync_len = m->crtc_hsync_end - m->crtc_hsync_start;
-
+ drm_display_mode_crtc_to_videomode(m, &vm);
polarities = HDLCD_POLARITY_DATAEN | HDLCD_POLARITY_DATA;

if (m->flags & DRM_MODE_FLAG_PHSYNC)
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
index d732810..fb298b8 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
@@ -76,17 +76,12 @@ static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
struct drm_display_mode *adj = &c->state->adjusted_mode;
struct atmel_hlcdc_crtc_state *state;
unsigned long mode_rate;
- struct videomode vm;
+ struct videomode vm = {};
unsigned long prate;
unsigned int cfg;
int div;

- vm.vfront_porch = adj->crtc_vsync_start - adj->crtc_vdisplay;
- vm.vback_porch = adj->crtc_vtotal - adj->crtc_vsync_end;
- vm.vsync_len = adj->crtc_vsync_end - adj->crtc_vsync_start;
- vm.hfront_porch = adj->crtc_hsync_start - adj->crtc_hdisplay;
- vm.hback_porch = adj->crtc_htotal - adj->crtc_hsync_end;
- vm.hsync_len = adj->crtc_hsync_end - adj->crtc_hsync_start;
+ drm_display_mode_crtc_to_videomode(adj, &vm);

regmap_write(regmap, ATMEL_HLCDC_CFG(1),
(vm.hsync_len - 1) | ((vm.vsync_len - 1) << 16));
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index e82b61e..328f771 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -654,6 +654,25 @@ void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
}
EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
+/**
+ * drm_display_mode_crtc_to_videomode - fill in @vm using crtc fields of @dmode
+ * @dmode: drm_display_mode structure to use as source
+ * @vm: videomode structure to use as destination
+ *
+ * Fills out @vm using the crtc display mode specified in @dmode.
+ */
+void drm_display_mode_crtc_to_videomode(const struct drm_display_mode *dmode,
+ struct videomode *vm)
+{
+ vm->hfront_porch = dmode->crtc_hsync_start - dmode->crtc_hdisplay;
+ vm->hsync_len = dmode->crtc_hsync_end - dmode->crtc_hsync_start;
+ vm->hback_porch = dmode->crtc_htotal - dmode->crtc_hsync_end;
+ vm->vfront_porch = dmode->crtc_vsync_start - dmode->crtc_vdisplay;
+ vm->vsync_len = dmode->crtc_vsync_end - dmode->crtc_vsync_start;
+ vm->vback_porch = dmode->crtc_vtotal - dmode->crtc_vsync_end;
+
+}
+EXPORT_SYMBOL_GPL(drm_display_mode_crtc_to_videomode);

/**
* drm_bus_flags_from_videomode - extract information about pixelclk and
diff --git a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
index 1c330f2..2535ebb 100644
--- a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
+++ b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
@@ -20,6 +20,7 @@
#include <linux/of_gpio.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
+#include <video/videomode.h>

#include "exynos_drm_drv.h"
#include "exynos_drm_crtc.h"
@@ -225,26 +226,23 @@ static void decon_commit(struct exynos_drm_crtc *crtc)
writel(val, ctx->addr + DECON_VIDTCON2);

if (!crtc->i80_mode) {
- int vbp = m->crtc_vtotal - m->crtc_vsync_end;
- int vfp = m->crtc_vsync_start - m->crtc_vdisplay;
+ struct videomode vm = {};

+ drm_display_mode_crtc_to_videomode(m, &vm);
if (interlaced)
- vbp = vbp / 2 - 1;
- val = VIDTCON00_VBPD_F(vbp - 1) | VIDTCON00_VFPD_F(vfp - 1);
+ vm.vback_porch = (vm.vback_porch >> 1) - 1;
+ val = VIDTCON00_VBPD_F(vm.vback_porch - 1) |
+ VIDTCON00_VFPD_F(vm.vfront_porch - 1);
writel(val, ctx->addr + DECON_VIDTCON00);

- val = VIDTCON01_VSPW_F(
- m->crtc_vsync_end - m->crtc_vsync_start - 1);
+ val = VIDTCON01_VSPW_F(vm.vsync_len - 1);
writel(val, ctx->addr + DECON_VIDTCON01);

- val = VIDTCON10_HBPD_F(
- m->crtc_htotal - m->crtc_hsync_end - 1) |
- VIDTCON10_HFPD_F(
- m->crtc_hsync_start - m->crtc_hdisplay - 1);
+ val = VIDTCON10_HBPD_F(vm.hback_porch - 1) |
+ VIDTCON10_HFPD_F(vm.hfront_porch - 1);
writel(val, ctx->addr + DECON_VIDTCON10);

- val = VIDTCON11_HSPW_F(
- m->crtc_hsync_end - m->crtc_hsync_start - 1);
+ val = VIDTCON11_HSPW_F(vm.hsync_len - 1);
writel(val, ctx->addr + DECON_VIDTCON11);
}

diff --git a/drivers/gpu/drm/exynos/exynos7_drm_decon.c b/drivers/gpu/drm/exynos/exynos7_drm_decon.c
index 3931d5e..5fdd093 100644
--- a/drivers/gpu/drm/exynos/exynos7_drm_decon.c
+++ b/drivers/gpu/drm/exynos/exynos7_drm_decon.c
@@ -25,6 +25,7 @@

#include <video/of_display_timing.h>
#include <video/of_videomode.h>
+#include <video/videomode.h>

#include "exynos_drm_crtc.h"
#include "exynos_drm_plane.h"
@@ -168,28 +169,24 @@ static void decon_commit(struct exynos_drm_crtc *crtc)
return;

if (!ctx->i80_if) {
- int vsync_len, vbpd, vfpd, hsync_len, hbpd, hfpd;
+ struct videomode vm = {};
+
+ drm_display_mode_crtc_to_videomode(mode, &vm);
/* setup vertical timing values. */
- vsync_len = mode->crtc_vsync_end - mode->crtc_vsync_start;
- vbpd = mode->crtc_vtotal - mode->crtc_vsync_end;
- vfpd = mode->crtc_vsync_start - mode->crtc_vdisplay;

- val = VIDTCON0_VBPD(vbpd - 1) | VIDTCON0_VFPD(vfpd - 1);
+ val = VIDTCON0_VBPD(vm.vback_porch - 1) |
+ VIDTCON0_VFPD(vm.vfront_porch - 1);
writel(val, ctx->regs + VIDTCON0);

- val = VIDTCON1_VSPW(vsync_len - 1);
+ val = VIDTCON1_VSPW(vm.vsync_len - 1);
writel(val, ctx->regs + VIDTCON1);

/* setup horizontal timing values. */
- hsync_len = mode->crtc_hsync_end - mode->crtc_hsync_start;
- hbpd = mode->crtc_htotal - mode->crtc_hsync_end;
- hfpd = mode->crtc_hsync_start - mode->crtc_hdisplay;
-
- /* setup horizontal timing values. */
- val = VIDTCON2_HBPD(hbpd - 1) | VIDTCON2_HFPD(hfpd - 1);
+ val = VIDTCON2_HBPD(vm.hback_porch - 1) |
+ VIDTCON2_HFPD(vm.hfront_porch - 1);
writel(val, ctx->regs + VIDTCON2);

- val = VIDTCON3_HSPW(hsync_len - 1);
+ val = VIDTCON3_HSPW(vm.hsync_len - 1);
writel(val, ctx->regs + VIDTCON3);
}

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index d42ae2b..c70b9ec 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
@@ -25,6 +25,7 @@

#include <video/of_display_timing.h>
#include <video/of_videomode.h>
+#include <video/videomode.h>
#include <video/samsung_fimd.h>
#include <drm/exynos_drm.h>

@@ -463,7 +464,7 @@ static void fimd_commit(struct exynos_drm_crtc *crtc)
return;
}
} else {
- int vsync_len, vbpd, vfpd, hsync_len, hbpd, hfpd;
+ struct videomode vm = {};
u32 vidcon1;

/* setup polarity values */
@@ -474,24 +475,19 @@ static void fimd_commit(struct exynos_drm_crtc *crtc)
vidcon1 |= VIDCON1_INV_HSYNC;
writel(vidcon1, ctx->regs + driver_data->timing_base + VIDCON1);

+ drm_display_mode_crtc_to_videomode(mode, &vm);
/* setup vertical timing values. */
- vsync_len = mode->crtc_vsync_end - mode->crtc_vsync_start;
- vbpd = mode->crtc_vtotal - mode->crtc_vsync_end;
- vfpd = mode->crtc_vsync_start - mode->crtc_vdisplay;

- val = VIDTCON0_VBPD(vbpd - 1) |
- VIDTCON0_VFPD(vfpd - 1) |
- VIDTCON0_VSPW(vsync_len - 1);
+ val = VIDTCON0_VBPD(vm.vback_porch - 1) |
+ VIDTCON0_VFPD(vm.vfront_porch - 1) |
+ VIDTCON0_VSPW(vm.vsync_len - 1);
writel(val, ctx->regs + driver_data->timing_base + VIDTCON0);

/* setup horizontal timing values. */
- hsync_len = mode->crtc_hsync_end - mode->crtc_hsync_start;
- hbpd = mode->crtc_htotal - mode->crtc_hsync_end;
- hfpd = mode->crtc_hsync_start - mode->crtc_hdisplay;

- val = VIDTCON1_HBPD(hbpd - 1) |
- VIDTCON1_HFPD(hfpd - 1) |
- VIDTCON1_HSPW(hsync_len - 1);
+ val = VIDTCON1_HBPD(vm.hback_porch - 1) |
+ VIDTCON1_HFPD(vm.hfront_porch - 1) |
+ VIDTCON1_HSPW(vm.hsync_len - 1);
writel(val, ctx->regs + driver_data->timing_base + VIDTCON1);
}

diff --git a/include/drm/drm_modes.h b/include/drm/drm_modes.h
index 0d310be..9ac764b 100644
--- a/include/drm/drm_modes.h
+++ b/include/drm/drm_modes.h
@@ -473,6 +473,8 @@ void drm_display_mode_from_videomode(const struct videomode *vm,
struct drm_display_mode *dmode);
void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
struct videomode *vm);
+void drm_display_mode_crtc_to_videomode(const struct drm_display_mode *dmode,
+ struct videomode *vm);
void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags);
int of_get_drm_display_mode(struct device_node *np,
struct drm_display_mode *dmode, u32 *bus_flags,
--
2.7.4
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