soc: swr-mstr: Check for fifo avail before bulk write

Check for fifo availability before writing slave registers
during swrm master bulk write so as to prevent swr
overflow, underflow errors.

Change-Id: I97a914cac289b3f1215ccf5c1abec88b959a9f21
Signed-off-by: Vatsal Bucha <[email protected]>

soc/swr-mstr-ctrl.c

@@ -128,6 +128,7 @@ static void swrm_unlock_sleep(struct swr_mstr_ctrl *swrm);
 static u32 swr_master_read(struct swr_mstr_ctrl *swrm, unsigned int reg_addr);
 static void swr_master_write(struct swr_mstr_ctrl *swrm, u16 reg_addr, u32 val);
 static int swrm_runtime_resume(struct device *dev);
+static void swrm_wait_for_fifo_avail(struct swr_mstr_ctrl *swrm, int swrm_rd_wr);
 
 static u8 swrm_get_clk_div(int mclk_freq, int bus_clk_freq)
 {
@@ -664,6 +665,9 @@ static int swr_master_bulk_write(struct swr_mstr_ctrl *swrm, u32 *reg_addr,
 		 * This still meets the hardware spec
 		 */
 			usleep_range(50, 55);
+			if (reg_addr[i] == SWRM_CMD_FIFO_WR_CMD)
+				swrm_wait_for_fifo_avail(swrm,
+							 SWRM_WR_CHECK_AVAIL);
 			swr_master_write(swrm, reg_addr[i], val[i]);
 		}
 		usleep_range(100, 110);