From: Raphael Gallais-Pou Date: Tue, 7 Sep 2021 15:15:34 +0000 (+0200) Subject: drm/stm: ltdc: add layer alpha support X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c20351ad58c9d352cd73b4ae34ce582de424cb52;p=linux.git drm/stm: ltdc: add layer alpha support 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 Acked-by: Yannick Fertre Reviewed-by: Yannick Fertre Signed-off-by: Philippe Cornu Link: https://patchwork.freedesktop.org/patch/msgid/20210907151534.6013-1-raphael.gallais-pou@foss.st.com --- diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c index bd603ef5e935f..dbdee954692a6 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;