From: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx>
[ Upstream commit 791255ca9fbe38042cfd55df5deb116dc11fef18 ]
[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@xxxxxxx>
Acked-by: Pavle Kotarac <Pavle.Kotarac@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index fef13e93a99fd..bdc894bd66e31 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -900,6 +900,11 @@ static int dm_dmub_hw_init(struct amdgpu_device *adev)
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;
fw_inst_const = dmub_fw->data +
--
2.34.1
