soundwire: intel/cadence: add flag for interrupt enable

Prepare for future PM support and fix error handling by disabling
interrupts as needed.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191022235448.17586-5-pierre-louis.bossart@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/soundwire/cadence_master.c

@@ -815,14 +815,17 @@ EXPORT_SYMBOL(sdw_cdns_exit_reset);
  * sdw_cdns_enable_interrupt() - Enable SDW interrupts and update config
  * @cdns: Cadence instance
  */
-int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns)
+int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
 {
-	u32 mask;
+	u32 slave_intmask0 = 0;
+	u32 slave_intmask1 = 0;
+	u32 mask = 0;
 
-	cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0,
-		    CDNS_MCP_SLAVE_INTMASK0_MASK);
-	cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1,
-		    CDNS_MCP_SLAVE_INTMASK1_MASK);
+	if (!state)
+		goto update_masks;
+
+	slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
+	slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;
 
 	/* enable detection of all slave state changes */
 	mask = CDNS_MCP_INT_SLAVE_MASK;
@@ -845,6 +848,9 @@ int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns)
 	if (interrupt_mask) /* parameter override */
 		mask = interrupt_mask;
 
+update_masks:
+	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);
 
 	/* commit changes */