Hi, Douglas Douglas Anderson <dianders@xxxxxxxxxxxx> 於 2024年6月12日 週三 上午1:28寫道: > > 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 2a073968289d > ("drm/atomic-helper: drm_atomic_helper_shutdown(NULL) should be a > noop") we don't need to confirm that "drm" is non-NULL. Applied to mediatek-drm-next [1], thanks. [1] https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-next > > Suggested-by: Maxime Ripard <mripard@xxxxxxxxxx> > Reviewed-by: Maxime Ripard <mripard@xxxxxxxxxx> > Reviewed-by: Fei Shao <fshao@xxxxxxxxxxxx> > Tested-by: Fei Shao <fshao@xxxxxxxxxxxx> > Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx> > --- > v1 of this patch was part of a series [1]. It got tested and reviewed > but never landed. Reposting separately in the hopes that Mediatek DRM > folks will land it. If, instead, Mediatek DRM folks want to Ack it I'm > happy to land through drm-misc. > > I noticed that this was missing when I failed to add "mediatek" to my > patch series IDing which DRM modeset drivers did this properly [2]. > Assuming my patch lands, that means that Mediatek devices will start > getting more warnings printed. > > [1] https://lore.kernel.org/r/20230901164111.RFT.5.I2b014f90afc4729b6ecc7b5ddd1f6dedcea4625b@changeid > [2] https://lore.kernel.org/r/20240611074846.1.Ieb287c2c3ee3f6d3b0d5f49b29f746b93621749c@changeid > > Changes in v2: > - Removed NULL check since it's not needed since 6.7 > - Rebased on ToT. > > drivers/gpu/drm/mediatek/mtk_drm_drv.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c > index b5f605751b0a..de811e2265da 100644 > --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c > +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c > @@ -952,6 +952,13 @@ 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); > @@ -983,6 +990,7 @@ 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, > -- > 2.45.2.505.gda0bf45e8d-goog >