drm/amd/display: Prevent using DMUB rptr that is out-of-bounds

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[Why]
Running into bugchecks during stress test where rptr is 0xFFFFFFFF.
Typically this is caused by a hard hang, and can come from HW outside
of DCN.

[How]
To prevent bugchecks when writing the DMUB rptr, fist check that the
rptr is valid.

Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Solomon Chiu <solomon.chiu@amd.com>
Signed-off-by: Wyatt Wood <wyatt.wood@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Wyatt Wood 2021-09-21 09:17:27 -04:00 • committed by Alex Deucher

parent 519607a2f7

commit 64df665ffe

2 changed files with 9 additions and 2 deletions

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1

drivers/gpu/drm/amd/display/dmub/dmub_srv.h

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10

drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c

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