drm/amd/pm: Notify PMFW about driver unload cases

On SMU v13.0.6 APUs, FW will need to take some actions if driver is going
to halt RLC. Notify PMFW that driver is not going to manage device so
that FW takes care of the required actions.
Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Le Ma <le.ma@amd.com>
Reviewed-by: Asad Kamal <asad.kamal@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_6_ppt.c

@@ -122,6 +122,7 @@ static const struct cmn2asic_msg_mapping smu_v13_0_6_message_map[SMU_MSG_MAX_COU
 	MSG_MAP(GetMaxGfxclkFrequency,               PPSMC_MSG_GetMaxGfxDpmFreq,                0),
 	MSG_MAP(SetSoftMinGfxclk,                    PPSMC_MSG_SetSoftMinGfxClk,                0),
 	MSG_MAP(SetSoftMaxGfxClk,                    PPSMC_MSG_SetSoftMaxGfxClk,                0),
+	MSG_MAP(PrepareMp1ForUnload,                 PPSMC_MSG_PrepareForDriverUnload,          0),
 };
 
 static const struct cmn2asic_mapping smu_v13_0_6_clk_map[SMU_CLK_COUNT] = {
@@ -1385,14 +1386,34 @@ int smu_v13_0_6_register_irq_handler(struct smu_context *smu)
 	return ret;
 }
 
+static int smu_v13_0_6_notify_unload(struct smu_context *smu)
+{
+	uint32_t smu_version;
+
+	smu_cmn_get_smc_version(smu, NULL, &smu_version);
+	if (smu_version <= 0x553500)
+		return 0;
+
+	dev_dbg(smu->adev->dev, "Notify PMFW about driver unload");
+	/* Ignore return, just intimate FW that driver is not going to be there */
+	smu_cmn_send_smc_msg(smu, SMU_MSG_PrepareMp1ForUnload, NULL);
+
+	return 0;
+}
+
 static int smu_v13_0_6_system_features_control(struct smu_context *smu,
 					       bool enable)
 {
+	struct amdgpu_device *adev = smu->adev;
 	int ret;
 
-	/* Nothing to be done for APU */
-	if (smu->adev->flags & AMD_IS_APU)
+	/* On APUs, notify FW that the device is no longer driver managed */
+	if (adev->flags & AMD_IS_APU) {
+		if (!enable)
+			smu_v13_0_6_notify_unload(smu);
+
 		return 0;
+	}
 
 	ret = smu_v13_0_system_features_control(smu, enable);