diff options
| author | Dale Zhao <[email protected]> | 2020-10-21 21:09:16 +0800 |
|---|---|---|
| committer | Alex Deucher <[email protected]> | 2020-11-02 15:31:51 -0500 |
| commit | 8edb94562a15374c26144b5c739a7bd42f80a337 (patch) | |
| tree | 92308b63448b277396576c7712ecaab86fa7e686 /tools/testing/selftests/bpf/prog_tests/sockmap_basic.c | |
| parent | 91d3156a3b1708cd1e049895217f7e0738123a9c (diff) | |
drm/amd/display: WA to ensure MUX chip gets SUPPORTED_LINK_RATES of eDP
[Why]
Customer make a request to add this WA by driver.
Some MUX chips will power down with eDP 1.4 panel and
lose previous supported link rates(DPCD 0x010) in
customer's hybrid-GPU designs. As a result, during sleep
resuming and screen turns on from idle, link training
will be performed incorrectly and eDP will flicker or
black screen. These MUX chips need source to read DPCD
0x010 again during LKT so that it can restore supported
link rates of panel.
For driver side, supported link rate set is fetched when
link detection, no need to update but just read again
as WA.
[How]
Read DPCD 0x010 again during link training for eDP 1.4.
Signed-off-by: Dale Zhao <[email protected]>
Reviewed-by: Wenjing Liu <[email protected]>
Acked-by: Qingqing Zhuo <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/sockmap_basic.c')
0 files changed, 0 insertions, 0 deletions