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

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Message-ID: <be06b65d-a39e-7e1d-891e-def55f0d8043@quicinc.com>
Date:   Thu, 16 Jun 2022 13:29:00 -0700
From:   Kuogee Hsieh <quic_khsieh@...cinc.com>
To:     Stephen Boyd <swboyd@...omium.org>, <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


On 6/16/2022 1:07 PM, Stephen Boyd wrote:
> 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.
ok, then I will drop this patch
>
>> ---
>>   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;