Re: [PATCH 1/7] drm/bridge: analogix_dp: drop extra calls to analogix_dp_prepare_panel()

Damon Ding
2025-04-14T02:01:25Z

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@oss.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@rock-chips.com>