From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
To: Kuogee Hsieh <quic_khsieh@quicinc.com>
Cc: quic_sbillaka@quicinc.com, quic_abhinavk@quicinc.com,
airlied@linux.ie, freedreno@lists.freedesktop.org,
dri-devel@lists.freedesktop.org, dianders@chromium.org,
vkoul@kernel.org, agross@kernel.org, bjorn.andersson@linaro.org,
linux-arm-msm@vger.kernel.org, swboyd@chromium.org,
sean@poorly.run, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] drm/msm/dp: cleared DP_DOWNSPREAD_CTRL register before start link training
Date: Thu, 8 Sep 2022 19:07:21 +0300 [thread overview]
Message-ID: <CAA8EJpr_cBTyugJx1qZCEEgsdNvxHmZ7TPZiqRu_kb=NNNVLKw@mail.gmail.com> (raw)
In-Reply-To: <1662651516-30283-1-git-send-email-quic_khsieh@quicinc.com>
On Thu, 8 Sept 2022 at 18:38, Kuogee Hsieh <quic_khsieh@quicinc.com> wrote:
>
> DOWNSPREAD_CTRL (0x107) shall be cleared to 0 upon power-on reset or an
> upstream device disconnect. This patch will enforce this rule by always
> cleared DOWNSPREAD_CTRL register to 0 before start link training. At rare
> case that DP MSA timing parameters may be mis-interpreted by the sink
> which causes audio sampling rate be calculated wrongly and cause audio
> did not work at sink if DOWNSPREAD_CTRL register is not cleared to 0.
> This patch also make sure bring sink out of D3 power-down mode into D0
> (normal operation mode) successfully by retrying 3 times.
Split into three separate patches please.
--
With best wishes
Dmitry
prev parent reply other threads:[~2022-09-08 16:07 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-08 15:38 [PATCH v3] drm/msm/dp: cleared DP_DOWNSPREAD_CTRL register before start link training Kuogee Hsieh
2022-09-08 16:07 ` Dmitry Baryshkov [this message]
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