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* [PATCH v2] drm/stm: ltdc: add layer alpha support
@ 2021-09-07 15:15 Raphael Gallais-Pou
2021-09-09 13:08 ` Philippe CORNU
0 siblings, 1 reply; 2+ messages in thread
From: Raphael Gallais-Pou @ 2021-09-07 15:15 UTC (permalink / raw)
To: Yannick Fertre, Philippe Cornu, Benjamin Gaignard
Cc: David Airlie, Daniel Vetter, Maxime Coquelin, Alexandre Torgue,
dri-devel, linux-stm32, linux-arm-kernel, linux-kernel,
Raphael Gallais-Pou, Raphael Gallais-Pou
Android Hardware Composer supports alpha values applied to layers.
Enabling non-opaque layers for the STM CRTC could help offload GPU
resources for screen composition.
Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
Acked-by: Yannick Fertre <yannick.fertre@foss.st.com>
Reviewed-by: Yannick Fertre <yannick.fertre@foss.st.com>
---
drivers/gpu/drm/stm/ltdc.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index 195de30eb90c..e0fef8bacfa8 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -845,7 +845,7 @@ static void ltdc_plane_atomic_update(struct drm_plane *plane,
LXCFBLR_CFBLL | LXCFBLR_CFBP, val);
/* Specifies the constant alpha value */
- val = CONSTA_MAX;
+ val = newstate->alpha >> 8;
reg_update_bits(ldev->regs, LTDC_L1CACR + lofs, LXCACR_CONSTA, val);
/* Specifies the blending factors */
@@ -997,6 +997,8 @@ static struct drm_plane *ltdc_plane_create(struct drm_device *ddev,
drm_plane_helper_add(plane, <dc_plane_helper_funcs);
+ drm_plane_create_alpha_property(plane);
+
DRM_DEBUG_DRIVER("plane:%d created\n", plane->base.id);
return plane;
--
2.17.1
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [PATCH v2] drm/stm: ltdc: add layer alpha support
2021-09-07 15:15 [PATCH v2] drm/stm: ltdc: add layer alpha support Raphael Gallais-Pou
@ 2021-09-09 13:08 ` Philippe CORNU
0 siblings, 0 replies; 2+ messages in thread
From: Philippe CORNU @ 2021-09-09 13:08 UTC (permalink / raw)
To: Raphael Gallais-Pou, Yannick Fertre, Benjamin Gaignard
Cc: David Airlie, Daniel Vetter, Maxime Coquelin, Alexandre Torgue,
dri-devel, linux-stm32, linux-arm-kernel, linux-kernel,
Raphael Gallais-Pou
On 9/7/21 5:15 PM, Raphael Gallais-Pou wrote:
> Android Hardware Composer supports alpha values applied to layers.
> Enabling non-opaque layers for the STM CRTC could help offload GPU
> resources for screen composition.
>
> Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
> Acked-by: Yannick Fertre <yannick.fertre@foss.st.com>
> Reviewed-by: Yannick Fertre <yannick.fertre@foss.st.com>
> ---
> drivers/gpu/drm/stm/ltdc.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
> index 195de30eb90c..e0fef8bacfa8 100644
> --- a/drivers/gpu/drm/stm/ltdc.c
> +++ b/drivers/gpu/drm/stm/ltdc.c
> @@ -845,7 +845,7 @@ static void ltdc_plane_atomic_update(struct drm_plane *plane,
> LXCFBLR_CFBLL | LXCFBLR_CFBP, val);
>
> /* Specifies the constant alpha value */
> - val = CONSTA_MAX;
> + val = newstate->alpha >> 8;
> reg_update_bits(ldev->regs, LTDC_L1CACR + lofs, LXCACR_CONSTA, val);
>
> /* Specifies the blending factors */
> @@ -997,6 +997,8 @@ static struct drm_plane *ltdc_plane_create(struct drm_device *ddev,
>
> drm_plane_helper_add(plane, <dc_plane_helper_funcs);
>
> + drm_plane_create_alpha_property(plane);
> +
> DRM_DEBUG_DRIVER("plane:%d created\n", plane->base.id);
>
> return plane;
>
Applied on drm-misc-next.
Many thanks for your patch,
Philippe :-)
^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-09-07 15:15 [PATCH v2] drm/stm: ltdc: add layer alpha support Raphael Gallais-Pou
2021-09-09 13:08 ` Philippe CORNU
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