[PATCH] drm/panel-simple: Undo enable if HPD never asserts

[Stephen Boyd]

Quoting Douglas Anderson (2021-01-14 17:22:59)
> If the HPD signal never asserts in panel_simple_prepare() and we
> return an error, we should unset the enable GPIO and disable the
> regulator to make it consistent for the caller.
> 
> At the moment I have some hardware where HPD sometimes doesn't assert.
> Obviously that needs to be debugged, but this patch makes it so that
> if I add a retry that I can make things work.
> 
> Fixes: 48834e6084f1 ("drm/panel-simple: Support hpd-gpios for delaying prepare()")
> Signed-off-by: Douglas Anderson <dianders at chromium.org>
> ---

Reviewed-by: Stephen Boyd <swboyd at chromium.org>