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drm/mediatek: Support "None" blending in OVL
Support "None" alpha blending mode on MediaTek's chips. Reviewed-by: CK Hu <ck.hu@mediatek.com> Signed-off-by: Hsiao Chien Sung <shawn.sung@mediatek.com> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Link: https://patchwork.kernel.org/project/dri-devel/patch/20240717-alpha-blending-v4-1-4b1c806c0749@mediatek.com/ Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
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@ -434,6 +434,7 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int idx,
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unsigned int fmt = pending->format;
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unsigned int offset = (pending->y << 16) | pending->x;
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unsigned int src_size = (pending->height << 16) | pending->width;
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unsigned int blend_mode = state->base.pixel_blend_mode;
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unsigned int ignore_pixel_alpha = 0;
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unsigned int con;
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bool is_afbc = pending->modifier != DRM_FORMAT_MOD_LINEAR;
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@ -463,7 +464,8 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int idx,
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* For RGB888 related formats, whether CONST_BLD is enabled or not won't
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* affect the result. Therefore we use !has_alpha as the condition.
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*/
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if (state->base.fb && !state->base.fb->format->has_alpha)
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if ((state->base.fb && !state->base.fb->format->has_alpha) ||
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blend_mode == DRM_MODE_BLEND_PIXEL_NONE)
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ignore_pixel_alpha = OVL_CONST_BLEND;
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if (pending->rotation & DRM_MODE_REFLECT_Y) {
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