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Date:   Thu, 14 Jan 2021 18:09:42 -0800
From:   Stephen Boyd <>
To:     Douglas Anderson <>,
        Sam Ravnborg <>,
        Thierry Reding <>
Cc:     Rob Clark <>,
        Douglas Anderson <>,
        Daniel Vetter <>,
        David Airlie <>,
        Linus Walleij <>,,
Subject: Re: [PATCH] drm/panel-simple: Undo enable if HPD never asserts

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 <>
> ---

Reviewed-by: Stephen Boyd <>

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