drm/amd/powerplay: report correct AC/DC event based on ctxid V2

'ctxid' is used to distinguish different events raised from SMC.
0x3 and 0x4 are for AC and DC power mode.

V2: update the way to retrieve the ctxid and change the log level
    to debug
Signed-off-by: Evan Quan <evan.quan@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

@@ -1556,6 +1556,11 @@ static int smu_v11_0_irq_process(struct amdgpu_device *adev,
 {
 	uint32_t client_id = entry->client_id;
 	uint32_t src_id = entry->src_id;
+	/*
+	 * ctxid is used to distinguish different
+	 * events for SMCToHost interrupt.
+	 */
+	uint32_t ctxid = entry->src_data[0];
 
 	if (client_id == SOC15_IH_CLIENTID_THM) {
 		switch (src_id) {
@@ -1596,8 +1601,18 @@ static int smu_v11_0_irq_process(struct amdgpu_device *adev,
 		dev_emerg(adev->dev, "System is going to shutdown due to HW CTF!\n");
 		orderly_poweroff(true);
 	} else if (client_id == SOC15_IH_CLIENTID_MP1) {
-		if (src_id == 0xfe)
-			smu_v11_0_ack_ac_dc_interrupt(&adev->smu);
+		if (src_id == 0xfe) {
+			switch (ctxid) {
+			case 0x3:
+				dev_dbg(adev->dev, "Switched to AC mode!\n");
+				smu_v11_0_ack_ac_dc_interrupt(&adev->smu);
+				break;
+			case 0x4:
+				dev_dbg(adev->dev, "Switched to DC mode!\n");
+				smu_v11_0_ack_ac_dc_interrupt(&adev->smu);
+				break;
+			}
+		}
 	}
 
 	return 0;