drm/amd/display: Fix secure display lock problems

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[Why]
Find out few locks problems while doing secure display. They are
following few parts:

1. crc_rd_work_lock in amdgpu_dm_crtc_handle_crc_window_irq() should
also use spin_lock_irqsave instead of spin_lock_irq.

2. In crc_win_update_set(), crc_rd_work_lock should be grabbed after
obtaining lock event_lock. Otherwise, will cause deadlock by conflicting
the lock order in amdgpu_dm_crtc_handle_crc_window_irq()

3. flush_work() in crc_win_update_set() is no need and will cause
deadlock since amdgpu_dm_crtc_notify_ta_to_read() also tries to grab
lock crc_rd_work_lock.

[How]
Fix above problems.

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Wayne Lin <Wayne.Lin@amd.com>
Reviewed-by: Solomon Chiu <Solomon.Chiu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Wayne Lin 2021-03-06 18:37:33 +08:00 • committed by Alex Deucher

parent 4870bd8813

commit cd95ef0097

2 changed files with 7 additions and 9 deletions

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10

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c

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6

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c

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