drm/amdgpu: add new flag AMD_PG_SUPPORT_MMHUB

Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c

@@ -698,6 +698,7 @@ static int gmc_v9_0_gart_enable(struct amdgpu_device *adev)
 	switch (adev->asic_type) {
 	case CHIP_RAVEN:
 		mmhub_v1_0_initialize_power_gating(adev);
+		mmhub_v1_0_update_power_gating(adev, true);
 		break;
 	default:
 		break;

drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c

@@ -426,7 +426,7 @@ void mmhub_v1_0_update_power_gating(struct amdgpu_device *adev,
 	pctl0_reng_execute = RREG32_SOC15(MMHUB, 0, mmPCTL0_RENG_EXECUTE);
 	pctl1_reng_execute = RREG32_SOC15(MMHUB, 0, mmPCTL1_RENG_EXECUTE);
 
-	if (enable) {
+	if (enable && adev->pg_flags & AMD_PG_SUPPORT_MMHUB) {
 		pctl0_reng_execute = REG_SET_FIELD(pctl0_reng_execute,
 						PCTL0_RENG_EXECUTE,
 						RENG_EXECUTE_ON_PWR_UP, 1);

drivers/gpu/drm/amd/include/amd_shared.h

@@ -184,6 +184,7 @@ enum amd_fan_ctrl_mode {
 #define AMD_PG_SUPPORT_SAMU			(1 << 10)
 #define AMD_PG_SUPPORT_GFX_QUICK_MG		(1 << 11)
 #define AMD_PG_SUPPORT_GFX_PIPELINE		(1 << 12)
+#define AMD_PG_SUPPORT_MMHUB			(1 << 13)
 
 enum amd_pm_state_type {
 	/* not used for dpm */