This is a note to let you know that I've just added the patch titled
drm/mediatek: dpi: Only enable dpi after the bridge is enabled
to the 5.19-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-dpi-only-enable-dpi-after-the-bridge-is.patch
and it can be found in the queue-5.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit da8b43fe9c1e5fc2e580163c25a10219b184346d
Author: Guillaume Ranquet <granquet@xxxxxxxxxxxx>
Date: Fri Jul 1 11:58:44 2022 +0800
drm/mediatek: dpi: Only enable dpi after the bridge is enabled
[ Upstream commit aed61ef6beb911cc043af0f2f291167663995065 ]
Enabling the dpi too early causes glitches on screen.
Move the call to mtk_dpi_enable() at the end of the bridge_enable
callback to ensure everything is setup properly before enabling dpi.
Fixes: 9e629c17aa8d ("drm/mediatek: Add DPI sub driver")
Signed-off-by: Guillaume Ranquet <granquet@xxxxxxxxxxxx>
Signed-off-by: Bo-Chen Chen <rex-bc.chen@xxxxxxxxxxxx>
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20220701035845.16458-16-rex-bc.chen@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_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index 675e2e4072df..41c783349321 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -417,7 +417,6 @@ static int mtk_dpi_power_on(struct mtk_dpi *dpi)
if (dpi->pinctrl && dpi->pins_dpi)
pinctrl_select_state(dpi->pinctrl, dpi->pins_dpi);
- mtk_dpi_enable(dpi);
return 0;
err_pixel:
@@ -639,6 +638,7 @@ static void mtk_dpi_bridge_enable(struct drm_bridge *bridge)
mtk_dpi_power_on(dpi);
mtk_dpi_set_display_mode(dpi, &dpi->mode);
+ mtk_dpi_enable(dpi);
}
static enum drm_mode_status
