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drm/msm/dpu: simplify bg_alpha selection

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In order to be more obvious in fg_alpha / bg_alpha handling during the
blending programming drop the default setting for background alpha value
and set it explicitly in all cases.

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/697896/
Link: https://lore.kernel.org/r/20260112-dpu-rework-alpha-v2-1-d168785911d5@oss.qualcomm.com
This commit is contained in:
Dmitry Baryshkov 2026-01-12 05:23:30 +02:00
parent 6efced27f5
commit eef07fd9aa
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
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@ -335,13 +335,13 @@ static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc_mixer *mixer,
max_alpha = 0x3ff;
fg_alpha = pstate->base.alpha >> 6;
}
bg_alpha = max_alpha - fg_alpha;
/* default to opaque blending */
if (pstate->base.pixel_blend_mode == DRM_MODE_BLEND_PIXEL_NONE ||
!format->alpha_enable) {
blend_op = DPU_BLEND_FG_ALPHA_FG_CONST |
DPU_BLEND_BG_ALPHA_BG_CONST;
bg_alpha = max_alpha - fg_alpha;
} else if (pstate->base.pixel_blend_mode == DRM_MODE_BLEND_PREMULTI) {
blend_op = DPU_BLEND_FG_ALPHA_FG_CONST |
DPU_BLEND_BG_ALPHA_FG_PIXEL;
@ -350,6 +350,7 @@ static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc_mixer *mixer,
blend_op |= DPU_BLEND_BG_MOD_ALPHA |
DPU_BLEND_BG_INV_MOD_ALPHA;
} else {
bg_alpha = 0;
blend_op |= DPU_BLEND_BG_INV_ALPHA;
}
} else {
@ -363,6 +364,7 @@ static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc_mixer *mixer,
DPU_BLEND_BG_MOD_ALPHA |
DPU_BLEND_BG_INV_MOD_ALPHA;
} else {
bg_alpha = 0;
blend_op |= DPU_BLEND_BG_INV_ALPHA;
}
}