6.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Hsiao Chien Sung <shawn.sung@xxxxxxxxxxxx>
[ Upstream commit 8e418bee401b7cfd0bc40d187afea2c6b08b44ec ]
Although the alpha channel in XRGB formats can be ignored, ALPHA_CON
must be configured accordingly when using XRGB formats or it will still
affects CRC generation.
Fixes: d886c0009bd0 ("drm/mediatek: Add ETHDR support for MT8195")
Reviewed-by: CK Hu <ck.hu@xxxxxxxxxxxx>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Signed-off-by: Hsiao Chien Sung <shawn.sung@xxxxxxxxxxxx>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20240620-igt-v3-4-a9d62d2e2c7e@xxxxxxxxxxxx/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/gpu/drm/mediatek/mtk_ethdr.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_ethdr.c b/drivers/gpu/drm/mediatek/mtk_ethdr.c
index d7d16482c9473..5c52e514ae301 100644
--- a/drivers/gpu/drm/mediatek/mtk_ethdr.c
+++ b/drivers/gpu/drm/mediatek/mtk_ethdr.c
@@ -153,6 +153,7 @@ void mtk_ethdr_layer_config(struct device *dev, unsigned int idx,
unsigned int offset = (pending->x & 1) << 31 | pending->y << 16 | pending->x;
unsigned int align_width = ALIGN_DOWN(pending->width, 2);
unsigned int alpha_con = 0;
+ bool replace_src_a = false;
dev_dbg(dev, "%s+ idx:%d", __func__, idx);
@@ -167,7 +168,15 @@ void mtk_ethdr_layer_config(struct device *dev, unsigned int idx,
if (state->base.fb && state->base.fb->format->has_alpha)
alpha_con = MIXER_ALPHA_AEN | MIXER_ALPHA;
- mtk_mmsys_mixer_in_config(priv->mmsys_dev, idx + 1, alpha_con ? false : true,
+ if (state->base.fb && !state->base.fb->format->has_alpha) {
+ /*
+ * Mixer doesn't support CONST_BLD mode,
+ * use a trick to make the output equivalent
+ */
+ replace_src_a = true;
+ }
+
+ mtk_mmsys_mixer_in_config(priv->mmsys_dev, idx + 1, replace_src_a,
MIXER_ALPHA,
pending->x & 1 ? MIXER_INX_MODE_EVEN_EXTEND :
MIXER_INX_MODE_BYPASS, align_width / 2 - 1, cmdq_pkt);
--
2.43.0
