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Add support for the drm_panic module, which displays a pretty user friendly message on the screen when a Linux kernel panic occurs. It doesn't work yet on laptop panels, maybe due to PSR. Adapted from Jocelyn's original patch to add DC drm_panic support. Reviewed-by: Harry Wentland <harry.wentland@amd.com> Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: Lu Yao <yaolu@kylinos.cn> Cc: Jocelyn Falempe <jfalempe@redhat.com> Cc: Harry Wentland <harry.wentland@amd.com>