Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-10 14:11:52 +00:00
Code Issues Packages Projects Releases Wiki Activity

drm/stm: ltdc: add layer alpha support

Browse Source 
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>
Signed-off-by: Philippe Cornu <philippe.cornu@foss.st.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210907151534.6013-1-raphael.gallais-pou@foss.st.com
This commit is contained in:
Raphael Gallais-Pou 2021-09-07 17:15:34 +02:00 committed by Philippe Cornu
parent ee2cda7b02
commit c20351ad58
1 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/drm/stm/ltdc.c
View File

@ -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, &ltdc_plane_helper_funcs);
drm_plane_create_alpha_property(plane);
DRM_DEBUG_DRIVER("plane:%d created\n", plane->base.id);
return plane;