2021-09-02 20:06:44

by Raphael Gallais-Pou

Subject: [PATCH] drm/stm: ltdc: attach immutable zpos property to planes

Defines plane ordering by hard-coding an immutable Z position from the
first plane, used as primary layer, to the next ones as overlay in order
of instantiation.

This zpos is only an information as it is not possible to modify it,
blending operations are still applied from the top to the bottom layer.

This patch helps to remove a warning message from the Android
Hardware Composer.

Signed-off-by: Raphael Gallais-Pou <[email protected]>
---
drivers/gpu/drm/stm/ltdc.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index 195de30eb90c..bd603ef5e935 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -1024,6 +1024,8 @@ static int ltdc_crtc_init(struct drm_device *ddev, struct drm_crtc *crtc)
return -EINVAL;
}

+ drm_plane_create_zpos_immutable_property(primary, 0);
+
ret = drm_crtc_init_with_planes(ddev, crtc, primary, NULL,
&ltdc_crtc_funcs, NULL);
if (ret) {
@@ -1046,6 +1048,7 @@ static int ltdc_crtc_init(struct drm_device *ddev, struct drm_crtc *crtc)
DRM_ERROR("Can not create overlay plane %d\n", i);
goto cleanup;
}
+ drm_plane_create_zpos_immutable_property(overlay, i);
}

return 0;
--
2.17.1

2021-09-07 07:21:01

by Yannick FERTRE

Subject: Re: [PATCH] drm/stm: ltdc: attach immutable zpos property to planes

Hi Raphael,
thanks for the patch.

Acked-by: Yannick Fertre <[email protected]>
Reviewed-by: Yannick Fertre <[email protected]>

On 9/2/21 5:30 PM, Raphael GALLAIS-POU - foss wrote:
> Defines plane ordering by hard-coding an immutable Z position from the
> first plane, used as primary layer, to the next ones as overlay in order
> of instantiation.
>
> This zpos is only an information as it is not possible to modify it,
> blending operations are still applied from the top to the bottom layer.
>
> This patch helps to remove a warning message from the Android
> Hardware Composer.
>
> Signed-off-by: Raphael Gallais-Pou <[email protected]>
> ---
> drivers/gpu/drm/stm/ltdc.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
> index 195de30eb90c..bd603ef5e935 100644
> --- a/drivers/gpu/drm/stm/ltdc.c
> +++ b/drivers/gpu/drm/stm/ltdc.c
> @@ -1024,6 +1024,8 @@ static int ltdc_crtc_init(struct drm_device *ddev, struct drm_crtc *crtc)
> return -EINVAL;
> }
>
> + drm_plane_create_zpos_immutable_property(primary, 0);
> +
> ret = drm_crtc_init_with_planes(ddev, crtc, primary, NULL,
> &ltdc_crtc_funcs, NULL);
> if (ret) {
> @@ -1046,6 +1048,7 @@ static int ltdc_crtc_init(struct drm_device *ddev, struct drm_crtc *crtc)
> DRM_ERROR("Can not create overlay plane %d\n", i);
> goto cleanup;
> }
> + drm_plane_create_zpos_immutable_property(overlay, i);
> }
>
> return 0;
>