[PATCH 5.17 002/219] drm/amd/display: Fix p-state allow debug index on dcn31

Greg Kroah-Hartman
2022-04-18T12:15:15Z

From: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>

commit 3107e1a7ae088ee94323fe9ab05dbefd65b3077f upstream.

[Why]
It changed since dcn30 but the hubbub31 constructor hasn't been
modified to reflect this.

[How]
Update the value in the constructor to 0x6 so we're checking the right
bits for p-state allow.

It worked before by accident, but can falsely assert 0 depending on HW
state transitions. The most frequent of which appears to be when
all pipes turn off during IGT tests.

Cc: Harry Wentland <harry.wentland@amd.com>

Fixes: e7031d8258f1b4 ("drm/amd/display: Add pstate verification and recovery for DCN31")
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Eric Yang <Eric.Yang2@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hubbub.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hubbub.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hubbub.c
@@ -1042,5 +1042,7 @@ void hubbub31_construct(struct dcn20_hub
hubbub31->detile_buf_size = det_size_kb * 1024;
hubbub31->pixel_chunk_size = pixel_chunk_size_kb * 1024;
hubbub31->crb_size_segs = config_return_buffer_size_kb / DCN31_CRB_SEGMENT_SIZE_KB;
+
+ hubbub31->debug_test_index_pstate = 0x6;
}