soundwire: bus: use sdw_write_no_pm when setting the bus scale registers

plbossart · vinodkoul · commit 299e9780b919 · 2021-02-06T15:54:53.000+05:30
When a Slave device is resumed, it may resume the bus and restart the enumeration. During that process, we absolutely don't want to call regular read/write routines which will wait for the resume to complete, otherwise a deadlock occurs. This patch fixes the same problem as the previous one, but is split to make the life of linux-stable maintainers less painful. Fixes: 29d158f ('soundwire: bus: initialize bus clock base and scale registers') Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Rander Wang <rander.wang@linux.intel.com> Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com> Link: https://lore.kernel.org/r/20210122070634.12825-3-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
@@ -1220,21 +1220,21 @@ static int sdw_slave_set_frequency(struct sdw_slave *slave)
 	}
 	scale_index++;
 
-	ret = sdw_write(slave, SDW_SCP_BUS_CLOCK_BASE, base);
+	ret = sdw_write_no_pm(slave, SDW_SCP_BUS_CLOCK_BASE, base);
 	if (ret < 0) {
 		dev_err(&slave->dev,
 			"SDW_SCP_BUS_CLOCK_BASE write failed:%d\n", ret);
 		return ret;
 	}
 
 	/* initialize scale for both banks */
-	ret = sdw_write(slave, SDW_SCP_BUSCLOCK_SCALE_B0, scale_index);
+	ret = sdw_write_no_pm(slave, SDW_SCP_BUSCLOCK_SCALE_B0, scale_index);
 	if (ret < 0) {
 		dev_err(&slave->dev,
 			"SDW_SCP_BUSCLOCK_SCALE_B0 write failed:%d\n", ret);
 		return ret;
 	}
-	ret = sdw_write(slave, SDW_SCP_BUSCLOCK_SCALE_B1, scale_index);
+	ret = sdw_write_no_pm(slave, SDW_SCP_BUSCLOCK_SCALE_B1, scale_index);
 	if (ret < 0)
 		dev_err(&slave->dev,
 			"SDW_SCP_BUSCLOCK_SCALE_B1 write failed:%d\n", ret);
