linux-kernel - Re: [PATCH v2 2/5] drm/panel-simple: Don't wait longer for HPD than hpd_absent

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Message-ID: <161160636226.76967.16862386814744159828@swboyd.mtv.corp.google.com>
Date:   Mon, 25 Jan 2021 12:26:02 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Douglas Anderson <dianders@...omium.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Thierry Reding <thierry.reding@...il.com>
Cc:     Rob Clark <robdclark@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/5] drm/panel-simple: Don't wait longer for HPD than hpd_absent_delay

Quoting Douglas Anderson (2021-01-15 14:44:17)
> If a panel has an hpd_absent_delay specified then we know exactly how
> long the maximum time is before HPD must be asserted.  That means we
> can use it as a timeout for polling the HPD pin instead of using an
> arbitrary timeout.  This is especially useful for dealing with panels
> that periodically fail to power on and need to be retried.  We can
> detect the problem sooner.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---

Reviewed-by: Stephen Boyd <swboyd@...omium.org>