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From:   Stephen Boyd <swboyd@chromium.org>
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Date:   Fri, 14 Oct 2022 14:11:35 -0700
Message-ID: <CAE-0n53W3+MgRzpkV-9kBc6Pcvzta+ear3oxgMA-0rpNyJyJwQ@mail.gmail.com>
Subject: Re: [PATCH v2] ASoC: qcom: lpass-cpu: mark HDMI TX registers as volatile
To:     Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>,
        agross@kernel.org, alsa-devel@alsa-project.org,
        andersson@kernel.org, bgoswami@quicinc.com, broonie@kernel.org,
        devicetree@vger.kernel.org, judyhsiao@chromium.org,
        lgirdwood@gmail.com, linux-arm-msm@vger.kernel.org,
        linux-kernel@vger.kernel.org, perex@perex.cz,
        quic_plai@quicinc.com, quic_rohkumar@quicinc.com,
        robh+dt@kernel.org, srinivas.kandagatla@linaro.org, tiwai@suse.com
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Quoting Srinivasa Rao Mandadapu (2022-10-12 22:08:31)
> Update HDMI volatile registers list as DMA, Channel Selection registers,
> vbit control registers are being reflected by hardware DP port
> disconnection.
>
> This update is required to fix no display and no sound issue observed
> after reconnecting TAMA/SANWA DP cables.
> Once DP cable is unplugged, DMA control registers are being reset by
> hardware, however at second plugin, new dma control values does not
> updated to the dma hardware registers since new register value and
> cached values at the time of first plugin are same.
>
> Fixes: 7cb37b7bd0d3 ("ASoC: qcom: Add support for lpass hdmi driver")
>
> Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
> Reported-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
> ---

I found that another patch in this area hasn't been applied[1]. Is it
still relevant? We're still carrying it in the chromium tree. If it is
relevant can you please resend it.

[1] https://lore.kernel.org/all/1602596728-11783-1-git-send-email-srivasam@codeaurora.org/