drm/amd/display: fix array index in DML
authorAurabindo Pillai <aurabindo.pillai@amd.com>
Tue, 21 Jun 2022 15:23:39 +0000 (11:23 -0400)
committerAlex Deucher <alexander.deucher@amd.com>
Tue, 21 Jun 2022 22:17:25 +0000 (18:17 -0400)
commitc85c623ab406188da7969180e53c4b61e8a982e0
treecef7cd4043245379d4da776615f124b5dd3b732e
parentfd6ae969cfa2b12c6082eb83bdfa648b15d9b3c7
drm/amd/display: fix array index in DML

[Why&How]
When the a 3d array is used by indexing with only one dimension in an if
condition, the addresses get compared instead of the intended value stored in the
array. GCC 12.1 caught this error:

drivers/gpu/drm/amd/amdgpu/../dal-dev/dc/dml/dcn32/display_mode_vba_32.c: In function ‘DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation’:
drivers/gpu/drm/amd/amdgpu/../dal-dev/dc/dml/dcn32/display_mode_vba_32.c:1007:45: error: the comparison will always evaluate as ‘true’ for the address of ‘use_one_row_for_frame_flip’ will never be NULL [-Werror=address]
1007 | if (v->use_one_row_for_frame_flip[k]) {
| ^
In file included from ./drivers/gpu/drm/amd/amdgpu/../dal-dev/dc/dml/display_mode_lib.h:32,
from ./drivers/gpu/drm/amd/amdgpu/../dal-dev/dc/dc.h:45,
from drivers/gpu/drm/amd/amdgpu/../dal-dev/dc/dml/dcn32/display_mode_vba_32.c:30:
./drivers/gpu/drm/amd/amdgpu/../dal-dev/dc/dml/display_mode_vba.h:605:14: note: ‘use_one_row_for_frame_flip’ declared here
605 | bool use_one_row_for_frame_flip[DC__VOLTAGE_STATES][2][DC__NUM_DPP__MAX];
|

Fix this by explicitly specifying the last two indices.

Fixes: dda4fb85e433 ("drm/amd/display: DML changes for DCN32/321")
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_32.c