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From:   Stephen Boyd <swboyd@chromium.org>
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Date:   Tue, 9 Aug 2022 21:10:26 -0500
Message-ID: <CAE-0n50e_rwTGwHyi=bajNCQ==h3ETO0iM1f75VpvoeLEpaZoA@mail.gmail.com>
Subject: Re: [PATCH] drm/msm/dp: check hpd_state before push idle pattern at dp_bridge_disable()
To:     Kuogee Hsieh <quic_khsieh@quicinc.com>, agross@kernel.org,
        airlied@linux.ie, bjorn.andersson@linaro.org, daniel@ffwll.ch,
        dianders@chromium.org, dmitry.baryshkov@linaro.org,
        robdclark@gmail.com, sean@poorly.run, vkoul@kernel.org
Cc:     quic_abhinavk@quicinc.com, quic_aravindh@quicinc.com,
        quic_sbillaka@quicinc.com, freedreno@lists.freedesktop.org,
        dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
        linux-kernel@vger.kernel.org
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Quoting Kuogee Hsieh (2022-08-09 13:44:50)
> dp_bridge_disable() is the first step toward tearing down main link.
> Its major function is to start transmitting idle pattern to replace
> video stream. This patch will check hpd_state to make sure main link
> is enabled before commit changes of main link's configuration to
> push idle pattern out to avoid system crashing due to main link clock
> is disabled while access main link registers.
>
> Fixes: 13ea4799a81b ("drm/msm/dp: remove extra wrappers and public functions");

Does it really fix 375a126090b9 ("drm/msm/dp: tear down main link at
unplug handle immediately")? I don't see how removing extra wrappers
caused us to start trying to set the idle pattern when the device was
unclocked.