[PATCH v2] drm/mediatek: Call drm_atomic_helper_shutdown() at shutdown time

[Linus Walleij]

On Tue, Jun 11, 2024 at 7:28 PM Douglas Anderson <dianders at chromium.org> wrote:

> 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.
>
> Suggested-by: Maxime Ripard <mripard at kernel.org>
> Reviewed-by: Maxime Ripard <mripard at kernel.org>
> Reviewed-by: Fei Shao <fshao at chromium.org>
> Tested-by: Fei Shao <fshao at chromium.org>
> Signed-off-by: Douglas Anderson <dianders at chromium.org>

Reviewed-by: Linus Walleij <linus.walleij at linaro.org>

Yours,
Linus Walleij