From: Nicholas Kazlauskas nicholas.kazlauskas@amd.com
commit a70939851f9ced298dc7d523374b8c4d05239caf upstream.
[Why] The "base_addr_is_mc_addr" field was added for dcn3.1 support but pa_config was never updated to set it to false.
Uninitialized memory causes it to be set to true which results in address mistranslation and white screen.
[How] Use memset to ensure all fields are initialized to 0 by default.
Fixes: 64b1d0e8d500 ("drm/amd/display: Add DCN3.1 HWSEQ") Signed-off-by: Nicholas Kazlauskas nicholas.kazlauskas@amd.com Acked-by: Alex Deucher alexander.deucher@amd.com Acked-by: Aaron Liu aaron.liu@amd.com Reviewed-by: Harry Wentland harry.wentland@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -998,6 +998,8 @@ static void mmhub_read_system_context(st uint32_t agp_base, agp_bot, agp_top; PHYSICAL_ADDRESS_LOC page_table_start, page_table_end, page_table_base;
+ memset(pa_config, 0, sizeof(*pa_config)); + logical_addr_low = min(adev->gmc.fb_start, adev->gmc.agp_start) >> 18; pt_base = amdgpu_gmc_pd_addr(adev->gart.bo);