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drm/mediatek: Support "None" blending in Mixer

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Support "None" alpha blending mode on MediaTek's chips.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Hsiao Chien Sung <shawn.sung@mediatek.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20240717-alpha-blending-v4-2-4b1c806c0749@mediatek.com/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
This commit is contained in:
Hsiao Chien Sung 2024-07-17 13:24:42 +08:00 • committed by Chun-Kuang Hu
parent 1f66fe62cc
commit eb17c59094
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/mediatek/mtk_ethdr.c
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@ -3,6 +3,7 @@
* Copyright (c) 2021 MediaTek Inc.
*/
#include <drm/drm_blend.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <linux/clk.h>
@ -175,7 +176,8 @@ void mtk_ethdr_layer_config(struct device *dev, unsigned int idx,
alpha_con |= state->base.alpha & MIXER_ALPHA;
}
if (state->base.fb && !state->base.fb->format->has_alpha) {
if ((state->base.fb && !state->base.fb->format->has_alpha) ||
state->base.pixel_blend_mode == DRM_MODE_BLEND_PIXEL_NONE) {
/*
* Mixer doesn't support CONST_BLD mode,
* use a trick to make the output equivalent