| Message ID | 20201103025000.68006-1-koba.ko@canonical.com |
|---|---|
| Headers | show |
| Series | drm/i915/dp_mst - only read the base capability in DPCD. | expand |
On 3.11.2020 4.49, Koba Ko wrote: > BugLink: https://bugs.launchpad.net/bugs/1902613 > > [Impact] > Currently DRM driver assume the source device caps is higher than the MST device > caps. With this commit, the statement would be broken. > > e.g. the source device only support DP1.2 and the mst device support DP1.4. > > The source device can't output the video to the external monitor on the docking station. > > [Fix] > Revert the previous patch and only read the base capability from DPCD. > > [test] > With the patch, The machine(DP1.2) connect with the external monitor on docking station(SC) and > can output the video to the external monitor on docking station(SC-DP1.4). > > [Regression Potential] > Can't output 4k@60hz on the docking station(SC). > > Koba Ko (1): > Revert "UBUNTU: SAUCE: drm/dp_mst: Retrieve extended DPCD caps for > topology manager" > > drivers/gpu/drm/drm_dp_mst_topology.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > applied to oem-5.6
BugLink: https://bugs.launchpad.net/bugs/1902613 [Impact] Currently DRM driver assume the source device caps is higher than the MST device caps. With this commit, the statement would be broken. e.g. the source device only support DP1.2 and the mst device support DP1.4. The source device can't output the video to the external monitor on the docking station. [Fix] Revert the previous patch and only read the base capability from DPCD. [test] With the patch, The machine(DP1.2) connect with the external monitor on docking station(SC) and can output the video to the external monitor on docking station(SC-DP1.4). [Regression Potential] Can't output 4k@60hz on the docking station(SC). Koba Ko (1): Revert "UBUNTU: SAUCE: drm/dp_mst: Retrieve extended DPCD caps for topology manager" drivers/gpu/drm/drm_dp_mst_topology.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)