[alsa-devel] [PATCH 2/6] soundwire: cadence_master: clear interrupt status before enabling interrupt

[Pierre-Louis Bossart]

From: Rander Wang <rander.wang at intel.com>

make sure all interrupts status are cleared before enabling interrupt
so that there is no unexpected interrupt triggered.

Signed-off-by: Rander Wang <rander.wang at intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
 drivers/soundwire/cadence_master.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
index a0ec21b64d42..847b8f5f0a32 100644
--- a/drivers/soundwire/cadence_master.c
+++ b/drivers/soundwire/cadence_master.c
@@ -856,6 +856,16 @@ int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
 		mask = interrupt_mask;
 
 update_masks:
+	/* clear slave interrupt status before enabling interrupt */
+	if (state) {
+		u32 slave_state;
+
+		slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
+		cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);
+		slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
+		cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);
+	}
+
 	cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
 	cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
 	cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
-- 
2.20.1