linux-kernel - Re: [PATCH v8 2/2] drm/msm/dp: clean up pixel_rate from dp

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Date:   Thu, 16 Jun 2022 13:07:38 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Kuogee Hsieh <quic_khsieh@...cinc.com>, agross@...nel.org,
        airlied@...ux.ie, bjorn.andersson@...aro.org, daniel@...ll.ch,
        dianders@...omium.org, dmitry.baryshkov@...aro.org,
        dri-devel@...ts.freedesktop.org, robdclark@...il.com,
        sean@...rly.run, vkoul@...nel.org
Cc:     quic_abhinavk@...cinc.com, quic_aravindh@...cinc.com,
        quic_sbillaka@...cinc.com, freedreno@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 2/2] drm/msm/dp: clean up pixel_rate from dp_ctrl.c

Quoting Kuogee Hsieh (2022-06-16 10:09:21)
> dp_ctrl keep an local cache of pixel_rate which increase confusing
> in regrading how pixel_rate being used. This patch refer pixel_rate
> directly from dp_panel to eliminate unnecessary pixel_rate variable
> from struct dp_ctrl.
>
> Changes in v8:
> -- add this patch to remove pixel_rate from dp_ctrl
>
> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>

I can send a proper patch for this myself later.

> ---
>  drivers/gpu/drm/msm/dp/dp_ctrl.c | 158 +++++++++++++++++++--------------------
>  drivers/gpu/drm/msm/dp/dp_ctrl.h |   2 -
>  2 files changed, 79 insertions(+), 81 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
> index 01028b5..6fddddd 100644
> --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
> +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
> @@ -1528,36 +1526,6 @@ static int dp_ctrl_link_maintenance(struct dp_ctrl_private *ctrl)
>         return ret;
>  }
>
> -static int dp_ctrl_process_phy_test_request(struct dp_ctrl_private *ctrl)
> -{
> -       int ret = 0;
> -
> -       if (!ctrl->link->phy_params.phy_test_pattern_sel) {
> -               drm_dbg_dp(ctrl->drm_dev,
> -                       "no test pattern selected by sink\n");
> -               return ret;
> -       }
> -
> -       /*
> -        * The global reset will need DP link related clocks to be
> -        * running. Add the global reset just before disabling the
> -        * link clocks and core clocks.
> -        */
> -       ret = dp_ctrl_off(&ctrl->dp_ctrl);
> -       if (ret) {
> -               DRM_ERROR("failed to disable DP controller\n");
> -               return ret;
> -       }
> -
> -       ret = dp_ctrl_on_link(&ctrl->dp_ctrl);
> -       if (!ret)
> -               ret = dp_ctrl_on_stream_phy_test_report(&ctrl->dp_ctrl);
> -       else
> -               DRM_ERROR("failed to enable DP link controller\n");
> -
> -       return ret;
> -}
> -
>  static bool dp_ctrl_send_phy_test_pattern(struct dp_ctrl_private *ctrl)
>  {
>         bool success = false;
> @@ -1610,6 +1578,56 @@ static bool dp_ctrl_send_phy_test_pattern(struct dp_ctrl_private *ctrl)
>         return success;
>  }
>
> +int dp_ctrl_on_stream_phy_test_report(struct dp_ctrl *dp_ctrl)
> +{
> +       int ret = 0;
> +       struct dp_ctrl_private *ctrl;
> +       unsigned long pixel_rate;
> +
> +       ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
> +
> +       pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;
> +       ret = dp_ctrl_enable_stream_clocks(ctrl, pixel_rate);
> +       if (ret) {
> +               DRM_ERROR("Failed to start pixel clocks. ret=%d\n", ret);
> +               return ret;
> +       }
> +
> +       dp_ctrl_send_phy_test_pattern(ctrl);
> +
> +       return 0;
> +}
> +
> +static int dp_ctrl_process_phy_test_request(struct dp_ctrl_private *ctrl)
> +{
> +       int ret = 0;
> +
> +       if (!ctrl->link->phy_params.phy_test_pattern_sel) {
> +               drm_dbg_dp(ctrl->drm_dev,
> +                       "no test pattern selected by sink\n");
> +               return ret;
> +       }
> +
> +       /*
> +        * The global reset will need DP link related clocks to be
> +        * running. Add the global reset just before disabling the
> +        * link clocks and core clocks.
> +        */
> +       ret = dp_ctrl_off(&ctrl->dp_ctrl);
> +       if (ret) {
> +               DRM_ERROR("failed to disable DP controller\n");
> +               return ret;
> +       }
> +
> +       ret = dp_ctrl_on_link(&ctrl->dp_ctrl);
> +       if (!ret)
> +               ret = dp_ctrl_on_stream_phy_test_report(&ctrl->dp_ctrl);
> +       else
> +               DRM_ERROR("failed to enable DP link controller\n");
> +
> +       return ret;
> +}
> +
>  void dp_ctrl_handle_sink_request(struct dp_ctrl *dp_ctrl)
>  {
>         struct dp_ctrl_private *ctrl;

I'd prefer these hunks to be part of a different patch. Either squashed
into the previous patch, or after the previous patch to show that a
forward declaration isn't necessary, but helped minimize the diff of
that patch.

> @@ -1685,6 +1703,7 @@ int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl)
>         u32 const phy_cts_pixel_clk_khz = 148500;
>         u8 link_status[DP_LINK_STATUS_SIZE];
>         unsigned int training_step;
> +       unsigned long pixel_rate;
>
>         if (!dp_ctrl)
>                 return -EINVAL;