[PATCH v2] drm/bridge: analogix_dp: Grab runtime PM reference for DP-AUX

[Brian Norris]

(updating Andrzej's email)

On Fri, Oct 1, 2021 at 2:50 PM Brian Norris <briannorris at chromium.org> wrote:
> If the display is not enable()d, then we aren't holding a runtime PM
> reference here. Thus, it's easy to accidentally cause a hang, if user
> space is poking around at /dev/drm_dp_aux0 at the "wrong" time.
>
> Let's get the panel and PM state right before trying to talk AUX.
>
> Fixes: 0d97ad03f422 ("drm/bridge: analogix_dp: Remove duplicated code")
> Cc: <stable at vger.kernel.org>
> Cc: Tomeu Vizoso <tomeu.vizoso at collabora.com>
> Signed-off-by: Brian Norris <briannorris at chromium.org>
> ---
>
> Changes in v2:
> - Fix spelling in Subject
> - DRM_DEV_ERROR() -> drm_err()
> - Propagate errors from un-analogix_dp_prepare_panel()
>
>  .../drm/bridge/analogix/analogix_dp_core.c    | 21 ++++++++++++++++++-
>  1 file changed, 20 insertions(+), 1 deletion(-)

Ping? Do I need to do anything more here?

Thanks,
Brian