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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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>