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drm/amd/display: Reset DMCUB before HW init 

[Why]
If the firmware wasn't reset by PSP or HW and is currently running
then the firmware will hang or perform underfined behavior when we
modify its firmware state underneath it.

[How]
Reset DMCUB before setting up cache windows and performing HW init.

Reviewed-by: Aurabindo Jayamohanan Pillai <Aurabindo.Pillai@amd.com>
Acked-by: Pavle Kotarac <Pavle.Kotarac@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nicholas Kazlauskas 2021-12-10 15:04:05 -08:00 committed by Alex Deucher
parent 4308acff0f
commit 47e62dbd8d
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -1054,6 +1054,11 @@ static int dm_dmub_hw_init(struct amdgpu_device *adev)
return 0; return 0;
} }
/* Reset DMCUB if it was previously running - before we overwrite its memory. */
status = dmub_srv_hw_reset(dmub_srv);
if (status != DMUB_STATUS_OK)
DRM_WARN("Error resetting DMUB HW: %d\n", status);
hdr = (const struct dmcub_firmware_header_v1_0 *)dmub_fw->data; hdr = (const struct dmcub_firmware_header_v1_0 *)dmub_fw->data;
fw_inst_const = dmub_fw->data + fw_inst_const = dmub_fw->data +