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drm/mediatek: Call drm_atomic_helper_shutdown() at shutdown time

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[ Upstream commit c38896ca63 ]

Based on grepping through the source code this driver appears to be
missing a call to drm_atomic_helper_shutdown() at system shutdown
time. Among other things, this means that if a panel is in use that it
won't be cleanly powered off at system shutdown time.

The fact that we should call drm_atomic_helper_shutdown() in the case
of OS shutdown/restart comes straight out of the kernel doc "driver
instance overview" in drm_drv.c.

This driver users the component model and shutdown happens in the base
driver. The "drvdata" for this driver will always be valid if
shutdown() is called and as of commit 2a07396828
("drm/atomic-helper: drm_atomic_helper_shutdown(NULL) should be a
noop") we don't need to confirm that "drm" is non-NULL.

Suggested-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Fei Shao <fshao@chromium.org>
Tested-by: Fei Shao <fshao@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240611102744.v2.1.I2b014f90afc4729b6ecc7b5ddd1f6dedcea4625b@changeid
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Douglas Anderson 2024-06-11 10:27:44 -07:00 committed by Greg Kroah-Hartman
parent 97f71343f7
commit b241d17aa1
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/mediatek/mtk_drm_drv.c
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@ -926,6 +926,13 @@ static void mtk_drm_remove(struct platform_device *pdev)
of_node_put(private->comp_node[i]);
}
static void mtk_drm_shutdown(struct platform_device *pdev)
{
struct mtk_drm_private *private = platform_get_drvdata(pdev);
drm_atomic_helper_shutdown(private->drm);
}
static int mtk_drm_sys_prepare(struct device *dev)
{
struct mtk_drm_private *private = dev_get_drvdata(dev);
@ -957,6 +964,7 @@ static const struct dev_pm_ops mtk_drm_pm_ops = {
static struct platform_driver mtk_drm_platform_driver = {
.probe = mtk_drm_probe,
.remove_new = mtk_drm_remove,
.shutdown = mtk_drm_shutdown,
.driver = {
.name = "mediatek-drm",
.pm = &mtk_drm_pm_ops,