APPLIED [OEM-5.14/OEM-5.17] Re: [PATCH 0/2 V2][SRU][U/J/OEM-5.14/OEM-5.17] UBUNTU: SAUCE: Fix WD22TB4 suspend and resume, two external monitor can not output

[Timo Aaltonen]

Timo Aaltonen kirjoitti 1.7.2022 klo 16.30:
> Koba Ko kirjoitti 21.6.2022 klo 8.33:
>> BugLink: https://bugs.launchpad.net/bugs/1979267
>>
>> [Impact]
>> Resume SUT from suspend mode, found external monitors can not output, 
>> but display setting can recognize external monitors.
>>
>> [Fix]
>> The WD22TB4 Thunderbolt dock at least will revert its DP_MAX_LINK_RATE
>> from HBR3 to HBR2 after system suspend/resume if the DP_DP13_DPCD_REV
>> registers are not read subsequently also as required.
>>
>> Fix this by reading DP_DP13_DPCD_REV registers as well, matching what is
>> done during connector detection. While at it also fix up the same call
>> in drm_dp_mst_dump_topology().
>>
>> [Test Case]
>> 1. Connect two 4K external monitor to WD22TB4.
>> 2. Put SUT into suspend mode and wait 30sec
>> 3. Resume SUT from suspend mode, found external monitors can not output.
>>
>> [Where problems could occur]
>> low
>>
>> V2: Add "UBUNTU: SAUCE:"
>>
>> Imre Deak (1):
>>    drm/dp/mst: Read the extended DPCD capabilities during system resume
>>
>>   drivers/gpu/drm/drm_dp_mst_topology.c | 7 ++-----
>>   1 file changed, 2 insertions(+), 5 deletions(-)
>>
> applied to oem-kernels, thanks
> 

and now with a fixed Subject

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