drm/amd/pm: Add LightSBR SMU MSG support

This new MSG provide the interface for driver to enable/disable the Light Secondary Bus Reset
support from SMU. When enabled, SMU will only do minimum NBIO response to the SBR request and
leave the real HW reset to be handled by driver later. When disabled (default state),SMU will
pass the request to PSP for a HW reset
Signed-off-by: Nshaoyunl <shaoyun.liu@amd.com>
Reviewed-by: NEvan Quan <evan.quan@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/inc/amdgpu_smu.h

@@ -1153,6 +1153,11 @@ struct pptable_funcs {
 	 *                                      parameters to defaults.
 	 */
 	int (*set_fine_grain_gfx_freq_parameters)(struct smu_context *smu);
+
+	/**
+	 * @set_light_sbr:  Set light sbr mode for the SMU.
+	 */
+	int (*set_light_sbr)(struct smu_context *smu, bool enable);
 };
 
 typedef enum {
@@ -1356,5 +1361,7 @@ ssize_t smu_sys_get_gpu_metrics(void *handle, void **table);
 int smu_enable_mgpu_fan_boost(void *handle);
 int smu_gfx_state_change_set(struct smu_context *smu, uint32_t state);
 
+int smu_set_light_sbr(struct smu_context *smu, bool enable);
+
 #endif
 #endif

drivers/gpu/drm/amd/pm/inc/arcturus_ppsmc.h

@@ -120,6 +120,13 @@
 #define PPSMC_MSG_ReadSerialNumTop32		 0x40
 #define PPSMC_MSG_ReadSerialNumBottom32		 0x41
 
+/* paramater for MSG_LightSBR
+ * 1 -- Enable light secondary bus reset, only do nbio respond without further handling,
+ *      leave driver to handle the real reset
+ * 0 -- Disable LightSBR, default behavior, SMU will pass the reset to PSP
+ */
+#define PPSMC_MSG_LightSBR			 0x42
+
 typedef uint32_t PPSMC_Result;
 typedef uint32_t PPSMC_Msg;
 #pragma pack(pop)

drivers/gpu/drm/amd/pm/inc/smu_types.h

@@ -224,6 +224,7 @@
 	__SMU_DUMMY_MAP(EnableDeterminism),		\
 	__SMU_DUMMY_MAP(DisableDeterminism),		\
 	__SMU_DUMMY_MAP(SetUclkDpmMode),		\
+	__SMU_DUMMY_MAP(LightSBR),			\
 
 #undef __SMU_DUMMY_MAP
 #define __SMU_DUMMY_MAP(type)	SMU_MSG_##type

drivers/gpu/drm/amd/pm/inc/smu_v11_0.h

@@ -295,5 +295,7 @@ int smu_v11_0_deep_sleep_control(struct smu_context *smu,
 
 void smu_v11_0_interrupt_work(struct smu_context *smu);
 
+int smu_v11_0_set_light_sbr(struct smu_context *smu, bool enable);
+
 #endif
 #endif

drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c

@@ -2972,6 +2972,19 @@ int smu_gfx_state_change_set(struct smu_context *smu, uint32_t state)
 	return ret;
 }
 
+int smu_set_light_sbr(struct smu_context *smu, bool enable)
+{
+	int ret = 0;
+
+	mutex_lock(&smu->mutex);
+	if (smu->ppt_funcs->set_light_sbr)
+		ret = smu->ppt_funcs->set_light_sbr(smu, enable);
+	mutex_unlock(&smu->mutex);
+
+	return ret;
+}
+
+
 static const struct amd_pm_funcs swsmu_pm_funcs = {
 	/* export for sysfs */
 	.set_fan_control_mode    = smu_pp_set_fan_control_mode,

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

@@ -142,6 +142,7 @@ static const struct cmn2asic_msg_mapping arcturus_message_map[SMU_MSG_MAX_COUNT]
 	MSG_MAP(GmiPwrDnControl,		     PPSMC_MSG_GmiPwrDnControl,			0),
 	MSG_MAP(ReadSerialNumTop32,		     PPSMC_MSG_ReadSerialNumTop32,		1),
 	MSG_MAP(ReadSerialNumBottom32,		     PPSMC_MSG_ReadSerialNumBottom32,		1),
+	MSG_MAP(LightSBR,			     PPSMC_MSG_LightSBR,			0),
 };
 
 static const struct cmn2asic_mapping arcturus_clk_map[SMU_CLK_COUNT] = {
@@ -2363,6 +2364,7 @@ static const struct pptable_funcs arcturus_ppt_funcs = {
 	.deep_sleep_control = smu_v11_0_deep_sleep_control,
 	.get_fan_parameters = arcturus_get_fan_parameters,
 	.interrupt_work = smu_v11_0_interrupt_work,
+	.set_light_sbr = smu_v11_0_set_light_sbr,
 };
 
 void arcturus_set_ppt_funcs(struct smu_context *smu)

drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c

@@ -1603,6 +1603,16 @@ int smu_v11_0_mode1_reset(struct smu_context *smu)
 	return ret;
 }
 
+int smu_v11_0_set_light_sbr(struct smu_context *smu, bool enable)
+{
+	int ret = 0;
+
+	ret =  smu_cmn_send_smc_msg_with_param(smu, SMU_MSG_LightSBR, enable ? 1 : 0, NULL);
+
+	return ret;
+}
+
+
 int smu_v11_0_get_dpm_ultimate_freq(struct smu_context *smu, enum smu_clk_type clk_type,
 						 uint32_t *min, uint32_t *max)
 {