[PATCH] drm/amd/pm: enable SCPM support for SMU

[Alex Deucher <alexander.deucher@xxxxxxx>]

From: Evan Quan <evan.quan@xxxxxxx>

With SCPM enabled, the pptable used will be signed. It cannot
be used directly by driver. To get the raw pptable, we need to
rely on the combo pptable(and its revelant SMU message).

Also, the pptable transferring(to SMU) will be performed by PSP.
Some SMU messages will be not available to driver any more.

Signed-off-by: Evan Quan <evan.quan@xxxxxxx>
Reviewed-by: Hawking Zhang <Hawking.Zhang@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
 drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c | 55 +++++++++++++++++------
 1 file changed, 41 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
index 2513b1af76d8..85fbb18a9e4b 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
@@ -488,8 +488,20 @@ static int smu_sys_set_pp_table(void *handle,
 static int smu_get_driver_allowed_feature_mask(struct smu_context *smu)
 {
 	struct smu_feature *feature = &smu->smu_feature;
-	int ret = 0;
 	uint32_t allowed_feature_mask[SMU_FEATURE_MAX/32];
+	int ret = 0;
+
+	/*
+	 * With SCPM enabled, the allowed featuremasks setting(via
+	 * PPSMC_MSG_SetAllowedFeaturesMaskLow/High) is not permitted.
+	 * That means there is no way to let PMFW knows the settings below.
+	 * Thus, we just assume all the features are allowed under
+	 * such scenario.
+	 */
+	if (smu->adev->scpm_enabled) {
+		bitmap_fill(feature->allowed, SMU_FEATURE_MAX);
+		return 0;
+	}
 
 	bitmap_zero(feature->allowed, SMU_FEATURE_MAX);
 
@@ -1156,13 +1168,19 @@ static int smu_smc_hw_setup(struct smu_context *smu)
 	/* smu_dump_pptable(smu); */
 
 	/*
-	 * Copy pptable bo in the vram to smc with SMU MSGs such as
-	 * SetDriverDramAddr and TransferTableDram2Smu.
+	 * With SCPM enabled, PSP is responsible for the PPTable transferring
+	 * (to SMU). Driver involvement is not needed and permitted.
 	 */
-	ret = smu_write_pptable(smu);
-	if (ret) {
-		dev_err(adev->dev, "Failed to transfer pptable to SMC!\n");
-		return ret;
+	if (!adev->scpm_enabled) {
+		/*
+		 * Copy pptable bo in the vram to smc with SMU MSGs such as
+		 * SetDriverDramAddr and TransferTableDram2Smu.
+		 */
+		ret = smu_write_pptable(smu);
+		if (ret) {
+			dev_err(adev->dev, "Failed to transfer pptable to SMC!\n");
+			return ret;
+		}
 	}
 
 	/* issue Run*Btc msg */
@@ -1170,10 +1188,16 @@ static int smu_smc_hw_setup(struct smu_context *smu)
 	if (ret)
 		return ret;
 
-	ret = smu_feature_set_allowed_mask(smu);
-	if (ret) {
-		dev_err(adev->dev, "Failed to set driver allowed features mask!\n");
-		return ret;
+	/*
+	 * With SCPM enabled, these actions(and relevant messages) are
+	 * not needed and permitted.
+	 */
+	if (!adev->scpm_enabled) {
+		ret = smu_feature_set_allowed_mask(smu);
+		if (ret) {
+			dev_err(adev->dev, "Failed to set driver allowed features mask!\n");
+			return ret;
+		}
 	}
 
 	ret = smu_system_features_control(smu, true);
@@ -1422,9 +1446,12 @@ static int smu_disable_dpms(struct smu_context *smu)
 		if (ret)
 			dev_err(adev->dev, "Failed to disable smu features except BACO.\n");
 	} else {
-		ret = smu_system_features_control(smu, false);
-		if (ret)
-			dev_err(adev->dev, "Failed to disable smu features.\n");
+		/* DisableAllSmuFeatures message is not permitted with SCPM enabled */
+		if (!adev->scpm_enabled) {
+			ret = smu_system_features_control(smu, false);
+			if (ret)
+				dev_err(adev->dev, "Failed to disable smu features.\n");
+		}
 	}
 
 	if (adev->ip_versions[GC_HWIP][0] >= IP_VERSION(9, 4, 2) &&
-- 
2.35.1