[PATCH] tests/kms_writeback: refresh to expose writeback output
Alex Hung
alex.hung at amd.com
Mon May 13 22:41:36 UTC 2024
On 2024-05-13 16:37, Abhinav Kumar wrote:
>
>
> On 5/13/2024 3:32 PM, Alex Hung wrote:
>>
>>
>> On 2024-05-13 16:20, Abhinav Kumar wrote:
>>>
>>>
>>> On 5/13/2024 3:06 PM, Alex Hung wrote:
>>>>
>>>>
>>>> On 2024-05-13 15:48, Abhinav Kumar wrote:
>>>>>
>>>>>
>>>>> On 5/13/2024 2:30 PM, Alex Hung wrote:
>>>>>> With dc2d7fb4f978, all kms_writeback subtests are skipped.
>>>>>>
>>>>>> Refresh the outputs to grab all supported connectors,
>>>>>> the writeback output that is just enabled.
>>>>>>
>>>>>
>>>>> Can you please help to explain how the tests are getting skipped
>>>>> due to setting the client_cap?
>>>>>
>>>>> And also why calling igt_display_reset_outputs() is fixing this issue?
>>>>
>>>> Without the igt_display_reset_outputs(), the result is
>>>>
>>>> IGT-Version: 1.28-gbe9b99928 (x86_64) (Linux: 6.7.0-rc5-99-custom
>>>> x86_64)
>>>> Using IGT_SRANDOM=1715637543 for randomisation
>>>> Opened device: /dev/dri/card0
>>>> Test requirement not met in function __igt_unique____real_main553,
>>>> file ../tests/kms_writeback.c:579:
>>>> Test requirement: output
>>>> Last errno: 95, Operation not supported
>>>> Subtest writeback-pixel-formats: SKIP (0.000s)
>>>> Subtest writeback-invalid-parameters: SKIP (0.000s)
>>>> Subtest writeback-fb-id: SKIP (0.000s)
>>>> Subtest writeback-fb-id-XRGB2101010: SKIP (0.000s)
>>>> Subtest writeback-check-output: SKIP (0.000s)
>>>> Subtest writeback-check-output-XRGB2101010: SKIP (0.000s)
>>>>
>>>>
>>>> It looks like the below "output =
>>>> kms_writeback_get_output(&display)" will return null as it cannot
>>>> find any connector type with DRM_MODE_CONNECTOR_WRITEBACK.
>>>>
>>>> The igt_display_reset_outputs() is able to re-initialize the output
>>>> and therefore includes the writeback output.
>>>>
>>>
>>> Thanks for the details, I understand the issue now.
>>>
>>> But rather than calling igt_display_reset_outputs(), I think better
>>> way will be to set the cap before calling igt_display_require()
>>>
>>> diff --git a/tests/kms_writeback.c b/tests/kms_writeback.c
>>> index f89b2d62fcc9..6ecab46e440b 100644
>>> --- a/tests/kms_writeback.c
>>> +++ b/tests/kms_writeback.c
>>> @@ -567,14 +567,13 @@ igt_main_args("b:c:f:dl", long_options,
>>> help_str, opt_handler, NULL)
>>>
>>> kmstest_set_vt_graphics_mode();
>>>
>>> + ret = drmSetClientCap(display.drm_fd,
>>> DRM_CLIENT_CAP_WRITEBACK_CONNECTORS, 1);
>>> + igt_require_f(!ret, "error setting
>>> DRM_CLIENT_CAP_WRITEBACK_CONNECTORS\n");
>>> +
>>> igt_display_require(&display, display.drm_fd);
>>>
>>> Let me know if that works for you.
>>>
>>
>> This works if DRM_CLIENT_CAP_ATOMIC is also set as below:
>>
>> Is this preferred?
>>
>> --- a/tests/kms_writeback.c
>> +++ b/tests/kms_writeback.c
>> @@ -567,14 +567,18 @@ igt_main_args("b:c:f:dl", long_options,
>> help_str, opt_handler, NULL)
>>
>> kmstest_set_vt_graphics_mode();
>>
>> - igt_display_require(&display, display.drm_fd);
>> -
>> - igt_require(display.is_atomic);
>> + if (drmSetClientCap(display.drm_fd,
>> DRM_CLIENT_CAP_ATOMIC, 1) == 0)
>> + display.is_atomic = 1;
>>
>> ret = drmSetClientCap(display.drm_fd,
>> DRM_CLIENT_CAP_WRITEBACK_CONNECTORS, 1);
>>
>> igt_require_f(!ret, "error setting
>> DRM_CLIENT_CAP_WRITEBACK_CONNECTORS\n");
>>
>> + igt_display_require(&display, display.drm_fd);
>> +
>> + igt_require(display.is_atomic);
>> +
>> +
>>
>
> Yes, looks correct to me because drm driver expects both to be set.
>
> 357 case DRM_CLIENT_CAP_WRITEBACK_CONNECTORS:
> 358 if (!file_priv->atomic)
> 359 return -EINVAL;
> 360 if (req->value > 1)
> 361 return -EINVAL;
> 362 file_priv->writeback_connectors = req->value;
> 363 break;
Thanks. Let me send a V2
>>
>>
>>
>>>>>
>>>>>> Fixes: dc2d7fb4f978 ("lib/igt_kms: move setting
>>>>>> DRM_CLIENT_CAP_WRITEBACK_CONNECTORS to kms_writeback")
>>>>>> Signed-off-by: Alex Hung <alex.hung at amd.com>
>>>>>> ---
>>>>>> tests/kms_writeback.c | 4 +++-
>>>>>> 1 file changed, 3 insertions(+), 1 deletion(-)
>>>>>>
>>>>>> diff --git a/tests/kms_writeback.c b/tests/kms_writeback.c
>>>>>> index f89b2d62f..4c54f3b89 100644
>>>>>> --- a/tests/kms_writeback.c
>>>>>> +++ b/tests/kms_writeback.c
>>>>>> @@ -572,9 +572,11 @@ igt_main_args("b:c:f:dl", long_options,
>>>>>> help_str, opt_handler, NULL)
>>>>>> igt_require(display.is_atomic);
>>>>>> ret = drmSetClientCap(display.drm_fd,
>>>>>> DRM_CLIENT_CAP_WRITEBACK_CONNECTORS, 1);
>>>>>> -
>>>>>
>>>>> Is this part needed for this patch?
>>>>
>>>> No, but I think they are related and thus grouping them together is
>>>> easier to read.
>>>>
>>>>>
>>>>>> igt_require_f(!ret, "error setting
>>>>>> DRM_CLIENT_CAP_WRITEBACK_CONNECTORS\n");
>>>>>> + /* Refresh the outputs to grab all supported connectors.*/
>>>>>> + igt_display_reset_outputs(&display);
>>>>>> +
>>>>>> output = kms_writeback_get_output(&display);
>>>>>> igt_require(output);
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