linux-kernel - Re: [PATCH 1/7] drm/bridge: analogix_dp: drop extra calls to analogix_dp_prepare

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Message-ID: <d0641e38-0d89-49ea-84c6-66707021406b@rock-chips.com>
Date: Mon, 14 Apr 2025 10:01:16 +0800
From: Damon Ding <damon.ding@...k-chips.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Laurent.pinchart@...asonboard.com, airlied@...il.com,
 andrzej.hajda@...el.com, dri-devel@...ts.freedesktop.org,
 jernej.skrabec@...il.com, jonas@...boo.se, linux-kernel@...r.kernel.org,
 maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
 neil.armstrong@...aro.org, quic_jesszhan@...cinc.com, rfoss@...nel.org,
 simona@...ll.ch, tzimmermann@...e.de
Subject: Re: [PATCH 1/7] drm/bridge: analogix_dp: drop extra calls to
 analogix_dp_prepare_panel()

On 2025/4/14 9:20, Damon Ding wrote:
> Hi Dmitry,
> 
> On 2025/4/1 13:11, Dmitry Baryshkov wrote:
>> The analogix_dp_prepare_panel() returns immediately if there is no
>> attached panel. Drop several calls to this function which are performed
>> when dp->plat_data->panel is NULL.
>>
>> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
>> ---
>>   drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 22 
>> +---------------------
>>   1 file changed, 1 insertion(+), 21 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/ 
>> drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> index 
>> 042154e2d8ccd74ac2dc27fe527e810a50e08a09..ab1cfc340aa95bbf13fe021bd33227b565a5458d 100644
>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> @@ -1005,17 +1005,11 @@ static int analogix_dp_get_modes(struct 
>> drm_connector *connector)
>>   {
>>       struct analogix_dp_device *dp = to_dp(connector);
>>       const struct drm_edid *drm_edid;
>> -    int ret, num_modes = 0;
>> +    int num_modes = 0;
>>       if (dp->plat_data->panel) {
>>           num_modes += drm_panel_get_modes(dp->plat_data->panel, 
>> connector);
>>       } else {
>> -        ret = analogix_dp_prepare_panel(dp, true, false);
>> -        if (ret) {
>> -            DRM_ERROR("Failed to prepare panel (%d)\n", ret);
>> -            return 0;
>> -        }
>> -
>>           drm_edid = drm_edid_read_ddc(connector, &dp->aux.ddc);
>>           drm_edid_connector_update(&dp->connector, drm_edid);
>> @@ -1024,10 +1018,6 @@ static int analogix_dp_get_modes(struct 
>> drm_connector *connector)
>>               num_modes += drm_edid_connector_add_modes(&dp->connector);
>>               drm_edid_free(drm_edid);
>>           }
>> -
>> -        ret = analogix_dp_prepare_panel(dp, false, false);
>> -        if (ret)
>> -            DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
>>       }
>>       if (dp->plat_data->get_modes)
>> @@ -1087,19 +1077,9 @@ analogix_dp_detect(struct drm_connector 
>> *connector, bool force)
>>       if (dp->plat_data->panel)
>>           return connector_status_connected;
>> -    ret = analogix_dp_prepare_panel(dp, true, false);
>> -    if (ret) {
>> -        DRM_ERROR("Failed to prepare panel (%d)\n", ret);
>> -        return connector_status_disconnected;
>> -    }
>> -
>>       if (!analogix_dp_detect_hpd(dp))
>>           status = connector_status_connected;
>> -    ret = analogix_dp_prepare_panel(dp, false, false);
>> -    if (ret)
>> -        DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
>> -
>>       return status;
>>   }
>>
> 
> With the patch series:
> https://patchwork.kernel.org/project/linux-rockchip/list/?series=942183
> 
> When I verify this patch, there will be a small warning:
> drivers/gpu/drm/bridge/analogix/analogix_dp_core.c:1075:6: warning: 
> unused variable 'ret' [-Wunused-variable]
>          int ret;
>              ^
> 
> It should be better to remove the unused 'ret'.
> 
> Best regards,
> Damon
> 
> 
> 

Tested-by: Damon Ding <damon.ding@...k-chips.com>