drm/amd/powerplay: enable thermal throttling logging support V2

Currently this feature is supported on Arcturus only. PMFW will
interrupt driver the first time when thermal throttling happened
and every one second afterwards if the throttling continuing. On
receiving the 1st interrupt, driver logs it the first time. However,
if the throttling continues, the logging will be performed every
minute to avoid log flooding.

V2: simplify the implemention by ratelimited printk
Signed-off-by: Evan Quan <evan.quan@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/smu_v11_0.c

@@ -1524,6 +1524,7 @@ static int smu_v11_0_irq_process(struct amdgpu_device *adev,
 				 struct amdgpu_irq_src *source,
 				 struct amdgpu_iv_entry *entry)
 {
+	struct smu_context *smu = &adev->smu;
 	uint32_t client_id = entry->client_id;
 	uint32_t src_id = entry->src_id;
 	/*
@@ -1532,6 +1533,11 @@ static int smu_v11_0_irq_process(struct amdgpu_device *adev,
 	 */
 	uint32_t ctxid = entry->src_data[0];
 	uint32_t data;
+	/*
+	 * if the throttling continues, the logging will be performed every
+	 * minute to avoid log flooding.
+	 */
+	static DEFINE_RATELIMIT_STATE(ratelimit_state, 60 * HZ, 1);
 
 	if (client_id == SOC15_IH_CLIENTID_THM) {
 		switch (src_id) {
@@ -1575,6 +1581,11 @@ static int smu_v11_0_irq_process(struct amdgpu_device *adev,
 				dev_dbg(adev->dev, "Switched to DC mode!\n");
 				smu_v11_0_ack_ac_dc_interrupt(&adev->smu);
 				break;
+			case 0x7:
+				if (__ratelimit(&ratelimit_state))
+					smu_log_thermal_throttling(smu);
+
+				break;
 			}
 		}
 	}