linux-kernel - [PATCH AUTOSEL 5.10 14/19] drm/amdgpu: correct the wrong cached state for GMC on PICASSO

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Date:   Mon, 20 Dec 2021 20:59:09 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Evan Quan <evan.quan@....com>, Guchun Chen <guchun.chen@....com>,
        Mario Limonciello <mario.limonciello@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>, christian.koenig@....com,
        Xinhui.Pan@....com, airlied@...ux.ie, daniel@...ll.ch,
        Hawking.Zhang@....com, john.clements@....com, Oak.Zeng@....com,
        rajneesh.bhardwaj@....com, Likun.Gao@....com, alex.sierra@....com,
        Dennis.Li@....com, lijo.lazar@....com, kevin1.wang@....com,
        jinhuieric.huang@....com, darren.powell@....com,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.10 14/19] drm/amdgpu: correct the wrong cached state for GMC on PICASSO

From: Evan Quan <evan.quan@....com>

[ Upstream commit 17c65d6fca844ee72a651944d8ce721e9040bf70 ]

Pair the operations did in GMC ->hw_init and ->hw_fini. That
can help to maintain correct cached state for GMC and avoid
unintention gate operation dropping due to wrong cached state.

BugLink: https://gitlab.freedesktop.org/drm/amd/-/issues/1828

Signed-off-by: Evan Quan <evan.quan@....com>
Acked-by: Guchun Chen <guchun.chen@....com>
Reviewed-by: Mario Limonciello <mario.limonciello@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c            | 8 ++++++++
 drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c          | 8 ++++----
 drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c | 7 ++++++-
 3 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index 3a864041968f6..68501f7a3ad5a 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -1685,6 +1685,14 @@ static int gmc_v9_0_hw_fini(void *handle)
 		return 0;
 	}
 
+	/*
+	 * Pair the operations did in gmc_v9_0_hw_init and thus maintain
+	 * a correct cached state for GMC. Otherwise, the "gate" again
+	 * operation on S3 resuming will fail due to wrong cached state.
+	 */
+	if (adev->mmhub.funcs->update_power_gating)
+		adev->mmhub.funcs->update_power_gating(adev, false);
+
 	amdgpu_irq_put(adev, &adev->gmc.ecc_irq, 0);
 	amdgpu_irq_put(adev, &adev->gmc.vm_fault, 0);
 
diff --git a/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c b/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c
index f84701c562bf2..12669c95d03be 100644
--- a/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c
@@ -303,10 +303,10 @@ static void mmhub_v1_0_update_power_gating(struct amdgpu_device *adev,
 	if (amdgpu_sriov_vf(adev))
 		return;
 
-	if (enable && adev->pg_flags & AMD_PG_SUPPORT_MMHUB) {
-		amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GMC, true);
-
-	}
+	if (adev->pg_flags & AMD_PG_SUPPORT_MMHUB)
+		amdgpu_dpm_set_powergating_by_smu(adev,
+						  AMD_IP_BLOCK_TYPE_GMC,
+						  enable);
 }
 
 static int mmhub_v1_0_gart_enable(struct amdgpu_device *adev)
diff --git a/drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c b/drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c
index eab9768029c11..dc0dbd2fd49db 100644
--- a/drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c
+++ b/drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c
@@ -1317,7 +1317,12 @@ static int pp_set_powergating_by_smu(void *handle,
 		pp_dpm_powergate_vce(handle, gate);
 		break;
 	case AMD_IP_BLOCK_TYPE_GMC:
-		pp_dpm_powergate_mmhub(handle);
+		/*
+		 * For now, this is only used on PICASSO.
+		 * And only "gate" operation is supported.
+		 */
+		if (gate)
+			pp_dpm_powergate_mmhub(handle);
 		break;
 	case AMD_IP_BLOCK_TYPE_GFX:
 		ret = pp_dpm_powergate_gfx(handle, gate);
-- 
2.34.1