commit 91adec9e0709 ("drm/amd/display: Look at firmware version to
determine using dmub on dcn21")
Newer DMUB firmware on Renoir and Green Sardine do not need to disable
dmcu and this actually causes problems with DP-C alt mode for a number of
machines.
Backport the fix from this from hand modified backport because mainline
switched to IP version checking which doesn't exist in linux-stable.
BugLink: https://gitlab.freedesktop.org/drm/amd/-/issues/1772
BugLink: https://gitlab.freedesktop.org/drm/amd/-/issues/1735
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
Changes from v1->v2:
* Update commit message syntax for hand modified commit
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
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 1ea31dcc7a8b..084491afe540 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1141,8 +1141,15 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
case CHIP_RAVEN:
case CHIP_RENOIR:
init_data.flags.gpu_vm_support = true;
- if (ASICREV_IS_GREEN_SARDINE(adev->external_rev_id))
+ switch (adev->dm.dmcub_fw_version) {
+ case 0: /* development */
+ case 0x1: /* linux-firmware.git hash 6d9f399 */
+ case 0x01000000: /* linux-firmware.git hash 9a0b0f4 */
+ init_data.flags.disable_dmcu = false;
+ break;
+ default:
init_data.flags.disable_dmcu = true;
+ }
break;
case CHIP_VANGOGH:
case CHIP_YELLOW_CARP:
--
2.25.1
