** Changed in: linux-oem-5.10 (Ubuntu Focal)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1913372
Title:
Fix the video can't output through WD19TB connected on TGL's Type-C
port during cold-boot
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-5.10 package in Ubuntu:
New
Status in linux source package in Focal:
In Progress
Status in linux-oem-5.10 source package in Focal:
Fix Committed
Status in linux source package in Groovy:
In Progress
Status in linux-oem-5.10 source package in Groovy:
New
Status in linux source package in Hirsute:
In Progress
Status in linux-oem-5.10 source package in Hirsute:
New
Bug description:
[Impact]
WD19TB would report the number of lane(2-lane) and it works well on Type-C
port of TGL platform.
Change the LTTPR mode to non-transparent mode, WD19TB would report the larger
number of lane(4-lane). It's over the type-c port's bandwidth.
[Fix]
The patch is provided by
Imre(https://patchwork.freedesktop.org/series/86267/).
Calculate the PBN divider value based on the rate and lane count link
parameters that the driver uses for all other computation.
[Test Case]
1. Connected the WD19TB with the TGL platform's Type-C port and
connected the external monitor on WD19TB with HDMI/Displayport.
2. Cold boot the TGL platform.
3. Check the monitor can be blinked and the video can output to the monitor.
[Where problems could occur]
It's more reasonable to calculate the PBN divider based on the source's rate
and lane count, not the mst's capability.
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