[igt-dev] [PATCH] tests/kms_dp_aux_dev: Check DP connection only before tests

[Modem, Bhanuprakash]

On Wed-26-10-2022 01:29 pm, Petri Latvala wrote:
> On Tue, Oct 25, 2022 at 08:16:15PM -0600, Alex Hung wrote:
>> Without DP port connected, kernel reports "Too many retries"
>> that indicates no sink to respond. This is the same across GPUs.
>>
>> amdgpu ... DM aux hw bus 2: Too many retries, giving up. First error: -5
>> i915 ... AUX C/DDI C/PHY C: Too many retries, giving up. First error: -110
>>
>> In addition, the test can result time out such as below:
>>
>> /dev/drm_dp_aux0: Connection timed out
>> /dev/drm_dp_aux1: Connection timed out

These timeouts are already handled in this test: 
https://cgit.freedesktop.org/drm/igt-gpu-tools/tree/tests/kms_dp_aux_dev.c#n88

IMO, It could be fine with existing test, since it'll work as a kind of 
negative scenario.

- Bhanu

>>
>> As a result, checking DP connection alone should be sufficient.
>>
>> Signed-off-by: Alex Hung <alex.hung at amd.com>
>> ---
>>   tests/kms_dp_aux_dev.c | 3 +--
>>   1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> diff --git a/tests/kms_dp_aux_dev.c b/tests/kms_dp_aux_dev.c
>> index ed9dd510..7fce74a4 100644
>> --- a/tests/kms_dp_aux_dev.c
>> +++ b/tests/kms_dp_aux_dev.c
>> @@ -53,8 +53,7 @@ static bool test(int drm_fd, uint32_t connector_id)
>>   	drmModeFreeConnector(connector);
>>   	igt_assert(dir_fd >= 0);
>>   
>> -	if (connector->connection != DRM_MODE_CONNECTED &&
>> -	    is_mst_connector(drm_fd, connector_id)) {
>> +	if (connector->connection != DRM_MODE_CONNECTED) {
>>   		close(dir_fd);
>>   		return false;
>>   	}
> 
> 
> Bhanuprakash, Swati, you wrote/reviewed this piece of code, please review
> this patch.
> 
>