[PATCH] drm/mediatek: ensure bridge disable happends before suspend

From: Hsin-Yi Wang
Date: Wed Jun 29 2022 - 15:06:16 EST


Make sure bridge_disable will be called before suspend by calling
drm_mode_config_helper_suspend() in .prepare callback.

Signed-off-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx>
---
The issue is found if suspend is called via VT2 in several MTK SoC (eg.
MT8173, MT8183, MT8186) chromebook boards with eDP bridge:
bridge disable is called through mtk-drm's suspend, and it needs to be
called before bridge pm runtime suspend.
So we move the hook to .prepare() and .complete().
---
drivers/gpu/drm/mediatek/mtk_drm_drv.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index 13a1bbe7ead7f..a42812e490007 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -828,8 +828,7 @@ static int mtk_drm_remove(struct platform_device *pdev)
return 0;
}

-#ifdef CONFIG_PM_SLEEP
-static int mtk_drm_sys_suspend(struct device *dev)
+static int mtk_drm_sys_prepare(struct device *dev)
{
struct mtk_drm_private *private = dev_get_drvdata(dev);
struct drm_device *drm = private->drm;
@@ -840,20 +839,21 @@ static int mtk_drm_sys_suspend(struct device *dev)
return ret;
}

-static int mtk_drm_sys_resume(struct device *dev)
+static void mtk_drm_sys_complete(struct device *dev)
{
struct mtk_drm_private *private = dev_get_drvdata(dev);
struct drm_device *drm = private->drm;
int ret;

ret = drm_mode_config_helper_resume(drm);
-
- return ret;
+ if (ret)
+ dev_err(dev, "Failed to resume\n");
}
-#endif

-static SIMPLE_DEV_PM_OPS(mtk_drm_pm_ops, mtk_drm_sys_suspend,
- mtk_drm_sys_resume);
+static const struct dev_pm_ops mtk_drm_pm_ops = {
+ .prepare = mtk_drm_sys_prepare,
+ .complete = mtk_drm_sys_complete,
+};

static struct platform_driver mtk_drm_platform_driver = {
.probe = mtk_drm_probe,
--
2.37.0.rc0.161.g10f37bed90-goog