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drm/amdgpu: keep mmhub clock gating being enabled during s2idle suspend

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Without MMHUB clock gating being enabled then MMHUB will not disconnect
from DF and will result in DF C-state entry can't be accessed during S2idle
suspend, and eventually s0ix entry will be blocked.

Signed-off-by: Prike Liang <Prike.Liang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Prike Liang 2022-04-19 17:22:34 +08:00 committed by Alex Deucher
parent a71849cdea
commit fb8cc3318e
1 changed files with 10 additions and 0 deletions
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10
drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
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@ -1151,6 +1151,16 @@ static int gmc_v10_0_set_clockgating_state(void *handle,
int r;
struct amdgpu_device *adev = (struct amdgpu_device *)handle;
/*
* The issue mmhub can't disconnect from DF with MMHUB clock gating being disabled
* is a new problem observed at DF 3.0.3, however with the same suspend sequence not
* seen any issue on the DF 3.0.2 series platform.
*/
if (adev->in_s0ix && adev->ip_versions[DF_HWIP][0] > IP_VERSION(3, 0, 2)) {
dev_dbg(adev->dev, "keep mmhub clock gating being enabled for s0ix\n");
return 0;
}
r = adev->mmhub.funcs->set_clockgating(adev, state);
if (r)
return r;