[PATCH v2 0/5] tests/kms_writeback: Add clone mode subtest

[Alex Hung]

On 2024-08-30 12:32, Jessica Zhang wrote:
> 
> 
> On 8/29/2024 1:28 PM, Alex Hung wrote:
>> I ran a smoke test and Patch 4 (tests/kms_writeback: Disable all 
>> outputs after igt_display_require()) is causing a regression on my 
>> test platform:
>>
>>
>> Starting subtest: writeback-check-output-XRGB2101010
>> (kms_writeback:1973) CRITICAL: Test assertion failure function 
>> get_and_wait_out_fence, file ../tests/kms_writeback.c:345:
>> (kms_writeback:1973) CRITICAL: Failed assertion: ret == 0
>> (kms_writeback:1973) CRITICAL: Last errno: 38, Function not implemented
>> (kms_writeback:1973) CRITICAL: sync_fence_wait failed: Timer expired
>> Stack trace:
>>    #0 ../lib/igt_core.c:2051 __igt_fail_assert()
>>    #1 [get_and_wait_out_fence+0x8e]
>>    #2 ../tests/kms_writeback.c:401 writeback_sequence()
>>    #3 ../tests/kms_writeback.c:424 writeback_check_output()
>>    #4 ../tests/kms_writeback.c:782 __igt_unique____real_main557()
>>    #5 ../tests/kms_writeback.c:557 main()
>>    #6 ../sysdeps/nptl/libc_start_call_main.h:58 __libc_start_call_main()
>>    #7 ../csu/libc-start.c:128 __libc_start_main@@GLIBC_2.34()
>>    #8 [_start+0x25]
>> Subtest writeback-check-output-XRGB2101010 failed.
> 
> Hi Alex,
> 
> Thanks for testing and reporting this.
> 
> The overall goal of that patch was to force a modeset for cases where 
> the primary display mode and the mode being used on writeback were the 
> same. If the modes are the same between commits, the DRM framework won't 
> perform a modeset on the encoder even if the connectors have been changed.
> 
> To get around this, we thought it would be good to disable all the 
> outputs and start from a clean state before doing the writeback 
> connector setup.
> 
> Is there anything in AMD's disable path that could cause the writeback 
> connector/encoder to be in a bad state for the next commit?
> 
> Thanks,
> 
> Jessica Zhang
> 

I did a quick check but haven't found anything wrong in disable path yet.

If this is required specifically for your devices, maybe you can have 
something similar to is_i915_device() or is_amdgpu_device() for time-being.


>>
>>
>>
>> On 2024-08-28 21:05, Jessica Zhang wrote:
>>> Add a subtest that will iterate through all pairs of
>>> non-writeback and writeback cloned outputs and dump the writeback
>>> framebuffer for each pair.
>>>
>>> This series includes:
>>>
>>> - Fixes for properly cleaning up the kms_writeback state and forcing a
>>>    modeset after igt_display_require() to prevent commit failures when
>>>    the writeback mode is the same as the primary display mode
>>> - Adjust the duplicate pipe check in igt_display_refresh() to allow for
>>>    combinations of valid clones
>>> - Moving the writeback dump to its own subtest
>>> - Adding a subtest to dump all writeback/non-writeback cloned pairs
>>>
>>> To dump the clone mode buffer, run the following command:
>>>
>>> IGT_FRAME_DUMP_PATH=<dump path> FRAME_PNG_FILE_NAME=<file name> \
>>>     ./build/tests/kms_writeback [--run-subtest dump-valid-clones] \
>>>     -dc <primary display mode>
>>>
>>> This will output a file named <file name>-encoder<writeback encoder
>>> id>-encoder<primary display encoder id>
>>>
>>> ---
>>> Changes in v2:
>>> - Corrected author email
>>> - Link to v1: 
>>> https://lore.kernel.org/r/20240828-igt-cwb-v1-0-48aee421fc97@quicinc.com
>>>
>>> ---
>>> Jessica Zhang (5):
>>>        tests/kms_writeback: clear writeback properties in teardown path
>>>        lib/igt_kms: Add helper to get encoder index
>>>        lib/igt_kms: loosen duplicate check in igt_display_refresh
>>>        tests/kms_writeback: Disable all outputs after 
>>> igt_display_require()
>>>        tests/kms_writeback: Add dump for valid clone mode
>>>
>>>   lib/igt_kms.c         | 57 +++++++++++++++++++++++++++++------
>>>   lib/igt_kms.h         |  2 ++
>>>   tests/kms_setmode.c   | 14 ++-------
>>>   tests/kms_writeback.c | 83 
>>> +++++++++++++++++++++++++++++++++++++++++++--------
>>>   4 files changed, 122 insertions(+), 34 deletions(-)
>>> ---
>>> base-commit: 3b6b2d238e864ff1af9e33159d3bbf4b7f01d86d
>>> change-id: 20240827-igt-cwb-23fd81d3a7a4
>>>
>>> Best regards,