[PATCH] drm/i915/dp: Fix DP MST error after unplugging TypeC cable

[Jani Nikula]

On Wed, 18 Sep 2019, Manasi Navare <manasi.d.navare at intel.com> wrote:
> On Wed, Sep 18, 2019 at 07:09:43AM +0530, srinivasan.s at intel.com wrote:
>> From: Srinivasan S <srinivasan.s at intel.com>
>> 
>> This patch avoids DP MST payload error message in dmesg, as it is trying
>> to read the payload from the disconnected DP MST device. After the unplug
>> the connector status is disconnected and we should not be looking for the
>> payload and hence remove the error and throw the warning.
>> 
>> This details can be found in:
>> https://bugs.freedesktop.org/show_bug.cgi?id=111632
>
> Please add this link as Bugzilla:
> https://bugs.freedesktop.org/show_bug.cgi?id=111632 after the Sign off
> statement

ITYM *before* Signed-off-by. But yeah, use the Bugzilla: tag, and please
use git log to see plenty of examples.

BR,
Jani.

>
>> 
>> Signed-off-by: Srinivasan S <srinivasan.s at intel.com>
>> ---
>>  drivers/gpu/drm/i915/display/intel_dp_mst.c | 7 ++++++-
>>  1 file changed, 6 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
>> index eeeb3f933aa4..5b2278fdf675 100644
>> --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
>> +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
>> @@ -215,7 +215,12 @@ static void intel_mst_disable_dp(struct intel_encoder *encoder,
>>  
>>  	ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
>>  	if (ret) {
>> -		DRM_ERROR("failed to update payload %d\n", ret);
>> +		if (!connector ||
>> +		    connector->base.status != connector_status_connected) {
>> +			DRM_WARN("DP MST disconnect\n");
>
> May be adding this check before calling drm_dp_update_payload_part1() is a better idea?
> If the connector is disconnected, why update payload?
>
> Jani, Ville, thoughts?
>
> Regards
> Manasi
>
>> +		} else {
>> +			DRM_ERROR("failed to update payload %d\n", ret);
>> +		}
>>  	}
>>  	if (old_crtc_state->has_audio)
>>  		intel_audio_codec_disable(encoder,
>> -- 
>> 2.7.4
>> 

-- 
Jani Nikula, Intel Open Source Graphics Center