ACK: [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

[Tim Gardner]

On 7/6/22 23:29, Koba Ko wrote:
> On Tue, Jun 21, 2022 at 10:00 PM Tim Gardner <tim.gardner at canonical.com> wrote:
>>
>> On 6/20/22 23:33, Koba Ko wrote:
>>> 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(-)
>>>
>>
>> For Jammy/linux I think we ought to wait until these patches are at
>> least merged to linux-next.
> It has landed on linux-next
> 7a710a8bc909313951eb9252d8419924c771d7c2) drm/dp/mst: Read the
> extended DPCD capabilities during system resume
> 
> Should I re-SRU?
> 
>>
>> rtg
>>
>> --
>> -----------
>> Tim Gardner
>> Canonical, Inc
Acked-by: Tim Gardner <tim.gardner at canonical.com>

-- 
-----------
Tim Gardner
Canonical, Inc