This is a note to let you know that I've just added the patch titled
drm/mediatek: Fix underrun in VDO1 when switches off the layer
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-mediatek-fix-underrun-in-vdo1-when-switches-off-.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit eded45a95ba14a9d5500c3dab5ec0ce2a8e3dee2
Author: Hsiao Chien Sung <shawn.sung@xxxxxxxxxxxx>
Date: Thu Dec 14 13:58:46 2023 +0800
drm/mediatek: Fix underrun in VDO1 when switches off the layer
[ Upstream commit 73b5ab27ab2ee616f2709dc212c2b0007894a12e ]
Do not reset Merge while using CMDQ because reset API doesn't
wait for frame done event as CMDQ does and could lead to
underrun when the layer is switching off.
Fixes: aaf94f7c3ae6 ("drm/mediatek: Add display merge async reset control")
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/20231214055847.4936-23-shawn.sung@xxxxxxxxxxxx/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_merge.c b/drivers/gpu/drm/mediatek/mtk_disp_merge.c
index e525a6b9e5b0..22f768d923d5 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_merge.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_merge.c
@@ -103,7 +103,7 @@ void mtk_merge_stop_cmdq(struct device *dev, struct cmdq_pkt *cmdq_pkt)
mtk_ddp_write(cmdq_pkt, 0, &priv->cmdq_reg, priv->regs,
DISP_REG_MERGE_CTRL);
- if (priv->async_clk)
+ if (!cmdq_pkt && priv->async_clk)
reset_control_reset(priv->reset_ctl);
}
