linux-kernel - Re: [PATCH v2 3/7] drm/msm/dp: reset aux controller after dp_aux_cmd_fifo

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Message-ID: <CAE-0n5121VG4V9mqw6UTj2T4DrN66r53aCONMJr4bqe_niHz_w@mail.gmail.com>
Date:   Thu, 22 Jul 2021 19:08:03 +0000
From:   Stephen Boyd <swboyd@...omium.org>
To:     Kuogee Hsieh <khsieh@...eaurora.org>,
        dri-devel@...ts.freedesktop.org, robdclark@...il.com,
        sean@...rly.run
Cc:     abhinavk@...eaurora.org, aravindh@...eaurora.org, airlied@...ux.ie,
        daniel@...ll.ch, bjorn.andersson@...aro.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/7] drm/msm/dp: reset aux controller after
 dp_aux_cmd_fifo_tx() failed.

Quoting Kuogee Hsieh (2021-07-13 08:54:03)
> Aux hardware calibration sequence requires resetting the aux controller
> in order for the new setting to take effect. However resetting the AUX
> controller will also clear HPD interrupt status which may accidentally
> cause pending unplug interrupt to get lost. Therefore reset aux
> controller only when link is in connection state when dp_aux_cmd_fifo_tx()
> fail. This fixes Link Layer CTS cases 4.2.1.1 and 4.2.1.2.
>
> Signed-off-by: Kuogee Hsieh <khsieh@...eaurora.org>
> ---

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