drm/amd/pm: inform SMU RLC status thus enable/disable DPM feature for vangogh

RLC is halted when system suspend/shutdown. However, due to DPM enabled, PMFW is
unaware of RLC being halted and will continue sending messages, which would
eventually cause an ACPI hang. Use the system_feature_control interface to
notify SMU the status of RLC (Normal/OFF) thus enable/disable DPM feature.
Signed-off-by: Xiaomeng Hou <Xiaomeng.Hou@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Lazar Lijo <Lijo.Lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/swsmu/smu11/vangogh_ppt.c

@@ -64,7 +64,7 @@ static struct cmn2asic_msg_mapping vangogh_message_map[SMU_MSG_MAX_COUNT] = {
 	MSG_MAP(PowerUpIspByTile,               PPSMC_MSG_PowerUpIspByTile,		0),
 	MSG_MAP(PowerDownVcn,                   PPSMC_MSG_PowerDownVcn,			0),
 	MSG_MAP(PowerUpVcn,                     PPSMC_MSG_PowerUpVcn,			0),
-	MSG_MAP(Spare,                          PPSMC_MSG_spare,				0),
+	MSG_MAP(RlcPowerNotify,                 PPSMC_MSG_RlcPowerNotify,		0),
 	MSG_MAP(SetHardMinVcn,                  PPSMC_MSG_SetHardMinVcn,		0),
 	MSG_MAP(SetSoftMinGfxclk,               PPSMC_MSG_SetSoftMinGfxclk,		0),
 	MSG_MAP(ActiveProcessNotify,            PPSMC_MSG_ActiveProcessNotify,		0),
@@ -722,6 +722,12 @@ static int vangogh_set_fine_grain_gfx_freq_parameters(struct smu_context *smu)
 	return 0;
 }
 
+static int vangogh_system_features_control(struct smu_context *smu, bool en)
+{
+	return smu_cmn_send_smc_msg_with_param(smu, SMU_MSG_RlcPowerNotify,
+					en ? RLC_STATUS_NORMAL : RLC_STATUS_OFF, NULL);
+}
+
 static const struct pptable_funcs vangogh_ppt_funcs = {
 
 	.check_fw_status = smu_v11_0_check_fw_status,
@@ -749,6 +755,7 @@ static const struct pptable_funcs vangogh_ppt_funcs = {
 	.print_clk_levels = vangogh_print_fine_grain_clk,
 	.set_default_dpm_table = vangogh_set_default_dpm_tables,
 	.set_fine_grain_gfx_freq_parameters = vangogh_set_fine_grain_gfx_freq_parameters,
+	.system_features_control = vangogh_system_features_control,
 };
 
 void vangogh_set_ppt_funcs(struct smu_context *smu)

drivers/gpu/drm/amd/pm/swsmu/smu11/vangogh_ppt.h

@@ -32,4 +32,8 @@ extern void vangogh_set_ppt_funcs(struct smu_context *smu);
 #define VANGOGH_UMD_PSTATE_SOCCLK       678
 #define VANGOGH_UMD_PSTATE_FCLK         800
 
+/* RLC Power Status */
+#define RLC_STATUS_OFF          0
+#define RLC_STATUS_NORMAL       1
+
 #endif