soc: swr-mstr: suppress continuous warning interrupts

Some warning interrupts keep flooding as long as data
path is enabled. Disable the interrupt after the first
interrupt to avoid flooding, and reenable for new data
path.

Change-Id: Ie4cd447be908ab40568fa24d6111d8a1f0483ee4
Signed-off-by: Ramprasad Katkam <[email protected]>

soc/swr-mstr-ctrl.c

@@ -992,6 +992,8 @@ static int swrm_slvdev_datapath_control(struct swr_master *master, bool enable)
 			mutex_unlock(&swrm->mlock);
 			return -EINVAL;
 		}
+		swr_master_write(swrm, SWR_MSTR_RX_SWRM_CPU_INTERRUPT_EN,
+					SWRM_INTERRUPT_STATUS_MASK);
 		/* apply the new port config*/
 		swrm_apply_port_config(master);
 	} else {
@@ -1252,7 +1254,7 @@ static int swrm_check_slave_change_status(struct swr_mstr_ctrl *swrm,
 static irqreturn_t swr_mstr_interrupt(int irq, void *dev)
 {
 	struct swr_mstr_ctrl *swrm = dev;
-	u32 value, intr_sts;
+	u32 value, intr_sts, intr_mask;
 	u32 temp = 0;
 	u32 status, chg_sts, i;
 	u8 devnum = 0;
@@ -1266,7 +1268,8 @@ static irqreturn_t swr_mstr_interrupt(int irq, void *dev)
 	mutex_unlock(&swrm->reslock);
 
 	intr_sts = swr_master_read(swrm, SWRM_INTERRUPT_STATUS);
-	intr_sts &= SWRM_INTERRUPT_STATUS_MASK;
+	intr_mask = swr_master_read(swrm, SWR_MSTR_RX_SWRM_CPU_INTERRUPT_EN);
+	intr_sts &= intr_mask;
 handle_irq:
 	for (i = 0; i < SWRM_INTERRUPT_MAX; i++) {
 		value = intr_sts & (1 << i);
@@ -1279,8 +1282,8 @@ handle_irq:
 			status = swr_master_read(swrm, SWRM_MCP_SLV_STATUS);
 			ret = swrm_find_alert_slave(swrm, status, &devnum);
 			if (ret) {
-				dev_err(swrm->dev, "no slave alert found.\
-						spurious interrupt\n");
+				dev_err_ratelimited(swrm->dev,
+				   "no slave alert found.spurious interrupt\n");
 				break;
 			}
 			swrm_cmd_fifo_rd_cmd(swrm, &temp, devnum, 0x0,
@@ -1360,10 +1363,17 @@ handle_irq:
 			swr_master_write(swrm, SWRM_CMD_FIFO_CMD, 0x1);
 			break;
 		case SWRM_INTERRUPT_STATUS_DOUT_PORT_COLLISION:
-			dev_dbg(swrm->dev, "SWR Port collision detected\n");
+			dev_err_ratelimited(swrm->dev, "SWR Port collision detected\n");
+			intr_mask &= ~SWRM_INTERRUPT_STATUS_DOUT_PORT_COLLISION;
+			swr_master_write(swrm,
+				SWR_MSTR_RX_SWRM_CPU_INTERRUPT_EN, intr_mask);
 			break;
 		case SWRM_INTERRUPT_STATUS_READ_EN_RD_VALID_MISMATCH:
 			dev_dbg(swrm->dev, "SWR read enable valid mismatch\n");
+			intr_mask &=
+				~SWRM_INTERRUPT_STATUS_READ_EN_RD_VALID_MISMATCH;
+			swr_master_write(swrm,
+				 SWR_MSTR_RX_SWRM_CPU_INTERRUPT_EN, intr_mask);
 			break;
 		case SWRM_INTERRUPT_STATUS_SPECIAL_CMD_ID_FINISHED:
 			complete(&swrm->broadcast);
@@ -1391,7 +1401,7 @@ handle_irq:
 	swr_master_write(swrm, SWRM_INTERRUPT_CLEAR, 0x0);
 
 	intr_sts = swr_master_read(swrm, SWRM_INTERRUPT_STATUS);
-	intr_sts &= SWRM_INTERRUPT_STATUS_MASK;
+	intr_sts &= intr_mask;
 
 	if (intr_sts) {
 		dev_dbg(swrm->dev, "%s: new interrupt received\n", __func__);