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

[Deucher, Alexander]

[Public]

Acked-by: Alex Deucher <alexander.deucher at amd.com>
________________________________
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Prike Liang <Prike.Liang at amd.com>
Sent: Monday, April 25, 2022 2:52 AM
To: amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>
Cc: Deucher, Alexander <Alexander.Deucher at amd.com>; Lazar, Lijo <Lijo.Lazar at amd.com>; Liang, Prike <Prike.Liang at amd.com>; Huang, Ray <Ray.Huang at amd.com>
Subject: [PATCH] drm/amdgpu: keep mmhub clock gating being enabled during s2idle suspend

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 at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
index a455e59f41f4..20946bc7fc93 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
@@ -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;
--
2.25.1

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