linux-kernel - Re: [PATCH 1/7] drm/msm/dp: use dp_ctrl_off_link

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Message-ID: <CAE-0n52SxJx8kOwQddWF096PsPy-0f8bDq_ss=u6i-hisD54Hg@mail.gmail.com>
Date:   Thu, 8 Jul 2021 07:03:23 +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 1/7] drm/msm/dp: use dp_ctrl_off_link_stream during PHY
 compliance test run

Quoting Kuogee Hsieh (2021-07-06 10:20:14)
> DP cable should always connect to DPU during the entire PHY compliance
> testing run. Since DP PHY compliance test is executed at irq_hpd event
> context, dp_ctrl_off_link_stream() should be used instead of dp_ctrl_off().
> dp_ctrl_off() is used for unplug event which is triggered when DP cable is
> dis connected.
>
> Signed-off-by: Kuogee Hsieh <khsieh@...eaurora.org>
> ---

Is this

Fixes: f21c8a276c2d ("drm/msm/dp: handle irq_hpd with sink_count = 0 correctly")

or

Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support")

? It's not clear how dp_ctrl_off() was working for compliance tests
before commit f21c8a276c2d.

>  drivers/gpu/drm/msm/dp/dp_ctrl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
> index caf71fa..27fb0f0 100644
> --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
> +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
> @@ -1530,7 +1530,7 @@ static int dp_ctrl_process_phy_test_request(struct dp_ctrl_private *ctrl)
>          * running. Add the global reset just before disabling the
>          * link clocks and core clocks.
>          */
> -       ret = dp_ctrl_off(&ctrl->dp_ctrl);
> +       ret = dp_ctrl_off_link_stream(&ctrl->dp_ctrl);
>         if (ret) {
>                 DRM_ERROR("failed to disable DP controller\n");
>                 return ret;