linux-kernel - Re: [PATCH v3 1/7] drm/msm/dp: tie dp_display_irq

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Message-ID: <4634ca79-e12b-0608-a123-6ed123f4a03c@quicinc.com>
Date:   Mon, 18 Sep 2023 10:02:44 -0700
From:   Kuogee Hsieh <quic_khsieh@...cinc.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC:     <dri-devel@...ts.freedesktop.org>, <robdclark@...il.com>,
        <sean@...rly.run>, <swboyd@...omium.org>, <dianders@...omium.org>,
        <vkoul@...nel.org>, <daniel@...ll.ch>, <airlied@...il.com>,
        <agross@...nel.org>, <andersson@...nel.org>,
        <quic_abhinavk@...cinc.com>, <quic_jesszhan@...cinc.com>,
        <quic_sbillaka@...cinc.com>, <marijn.suijten@...ainline.org>,
        <freedreno@...ts.freedesktop.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/7] drm/msm/dp: tie dp_display_irq_handler() with dp
 driver


On 9/15/2023 5:29 PM, Dmitry Baryshkov wrote:
> On Sat, 16 Sept 2023 at 00:38, Kuogee Hsieh <quic_khsieh@...cinc.com> wrote:
>> Currently the dp_display_irq_handler() is executed at msm_dp_modeset_init()
>> which ties irq registration to the DPU device's life cycle, while depending on
>> resources that are released as the DP device is torn down. Move register DP
>> driver irq handler at dp_display_probe() to have dp_display_irq_handler()
>> is tied with DP device.
>>
>> Changes in v3:
>> -- move calling dp_display_irq_handler() to probe
> Was there a changelog for the previous reivions? What is the
> difference between v1 and v2?

Sorry, v2 is same as v3.

I submitted v2 first but found i forget to add change logs from review 
comments of v1.

Therefore i submit v3 to add changes logs which missing at v2.



>
>> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
>> ---
>>   drivers/gpu/drm/msm/dp/dp_display.c | 35 +++++++++++++----------------------
>>   drivers/gpu/drm/msm/dp/dp_display.h |  1 -
>>   2 files changed, 13 insertions(+), 23 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
>> index 76f1395..c217430 100644
>> --- a/drivers/gpu/drm/msm/dp/dp_display.c
>> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
>> @@ -1193,30 +1193,23 @@ static irqreturn_t dp_display_irq_handler(int irq, void *dev_id)
>>          return ret;
>>   }
>>
>> -int dp_display_request_irq(struct msm_dp *dp_display)
>> +static int dp_display_request_irq(struct dp_display_private *dp)
>>   {
>>          int rc = 0;
>> -       struct dp_display_private *dp;
>> -
>> -       if (!dp_display) {
>> -               DRM_ERROR("invalid input\n");
>> -               return -EINVAL;
>> -       }
>> -
>> -       dp = container_of(dp_display, struct dp_display_private, dp_display);
>> +       struct device *dev = &dp->pdev->dev;
>>
>> -       dp->irq = irq_of_parse_and_map(dp->pdev->dev.of_node, 0);
>>          if (!dp->irq) {
> What is the point in this check?
>
>> -               DRM_ERROR("failed to get irq\n");
>> -               return -EINVAL;
>> +               dp->irq = platform_get_irq(dp->pdev, 0);
>> +               if (!dp->irq) {
>> +                       DRM_ERROR("failed to get irq\n");
>> +                       return -EINVAL;
>> +               }
>>          }
>>
>> -       rc = devm_request_irq(dp_display->drm_dev->dev, dp->irq,
>> -                       dp_display_irq_handler,
>> +       rc = devm_request_irq(dev, dp->irq, dp_display_irq_handler,
>>                          IRQF_TRIGGER_HIGH, "dp_display_isr", dp);
>>          if (rc < 0) {
>> -               DRM_ERROR("failed to request IRQ%u: %d\n",
>> -                               dp->irq, rc);
>> +               DRM_ERROR("failed to request IRQ%u: %d\n", dp->irq, rc);
>>                  return rc;
>>          }
>>
>> @@ -1287,6 +1280,10 @@ static int dp_display_probe(struct platform_device *pdev)
>>
>>          platform_set_drvdata(pdev, &dp->dp_display);
>>
>> +       rc = dp_display_request_irq(dp);
>> +       if (rc)
>> +               return rc;
> This way the IRQ ends up being enabled in _probe. Are we ready to
> handle it here? Is the DP device fully setup at this moment?
>
>> +
>>          rc = component_add(&pdev->dev, &dp_display_comp_ops);
>>          if (rc) {
>>                  DRM_ERROR("component add failed, rc=%d\n", rc);
>> @@ -1549,12 +1546,6 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
>>
>>          dp_priv = container_of(dp_display, struct dp_display_private, dp_display);
>>
>> -       ret = dp_display_request_irq(dp_display);
>> -       if (ret) {
>> -               DRM_ERROR("request_irq failed, ret=%d\n", ret);
>> -               return ret;
>> -       }
>> -
>>          ret = dp_display_get_next_bridge(dp_display);
>>          if (ret)
>>                  return ret;
>> diff --git a/drivers/gpu/drm/msm/dp/dp_display.h b/drivers/gpu/drm/msm/dp/dp_display.h
>> index 1e9415a..b3c08de 100644
>> --- a/drivers/gpu/drm/msm/dp/dp_display.h
>> +++ b/drivers/gpu/drm/msm/dp/dp_display.h
>> @@ -35,7 +35,6 @@ struct msm_dp {
>>   int dp_display_set_plugged_cb(struct msm_dp *dp_display,
>>                  hdmi_codec_plugged_cb fn, struct device *codec_dev);
>>   int dp_display_get_modes(struct msm_dp *dp_display);
>> -int dp_display_request_irq(struct msm_dp *dp_display);
>>   bool dp_display_check_video_test(struct msm_dp *dp_display);
>>   int dp_display_get_test_bpp(struct msm_dp *dp_display);
>>   void dp_display_signal_audio_start(struct msm_dp *dp_display);
>> --
>> 2.7.4
>>
>