linux-kernel - Re: [PATCH] drm/msm/dp: reset dp controller only at boot up and pm

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] [day] [month] [year] [list]

Message-ID: <161256540764.76967.2035577896654812758@swboyd.mtv.corp.google.com>
Date:   Fri, 05 Feb 2021 14:50:07 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Kuogee Hsieh <khsieh@...eaurora.org>, robdclark@...il.com,
        sean@...rly.run
Cc:     tanmay@...eaurora.org, abhinavk@...eaurora.org,
        aravindh@...eaurora.org, khsieh@...eaurora.org, airlied@...ux.ie,
        daniel@...ll.ch, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm/dp: reset dp controller only at boot up and pm_resume

Quoting Kuogee Hsieh (2021-02-05 12:44:38)
> DP_SW_RESET is the global SW reset that is used to initialize DP
> controller. If DP_SW_RESET executed during connection setup,
> two HPD related side effects may occurred,
> 1) pending HPD interrupts cleared unexpected
> 2) re start debounce logic which trigger another interrupt
> This patch only issue DP_SW_RESET at boot up and pm_resume.
> This patch also reinit video_comp before configure dp controller
> to avoid missing VIDEO_READY interrupt.
> 
> Fixes: 9fc418430c65 ("drm/msm/dp: unplug interrupt missed after irq_hpd handler")
> Signed-off-by: Kuogee Hsieh <khsieh@...eaurora.org>
> ---

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