[PATCH][focal] Remove amdgpu assert warnings if retimer is not available

[Alex Hung]

BugLink: https://bugs.launchpad.net/bugs/1871248

[Impact]

amdgpu generates assert warning messages when retimer is not supported.
This behaviour can cause confusions to users.

[Fix]

This is fixed by commit a0e40018dcc3f59a. It silences ASSERTs by
outputing a debug message and exiting when retimer is not supported by
hardware.

[Test]

Verified on B450 I AORUS PRO WIFI with AMD Ryzen 3 3200G as discussed
on LP:1871248.

[Regression Potential]

Low. It is for unsupported hardware features, and the patch was cherry-picked
from upstream kernel 5.7 rc1.

Rodrigo Siqueira (1):
  drm/amd/display: Stop if retimer is not available

 drivers/gpu/drm/amd/display/dc/core/dc_link.c | 67 ++++++++++++---------------
 1 file changed, 29 insertions(+), 38 deletions(-)

-- 
2.7.4