From 299e9780b9196bcb15b26dfdccd3244eb072d560 Mon Sep 17 00:00:00 2001
From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Date: Fri, 22 Jan 2021 15:06:27 +0800
Subject: [PATCH] soundwire: bus: use sdw_write_no_pm when setting the bus scale registers
Git-commit: 299e9780b9196bcb15b26dfdccd3244eb072d560
Patch-mainline: v5.12-rc1
References: git-fixes

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: 29d158f90690 ('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>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/soundwire/bus.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index 6933edbbeff6..b8b578191a3b 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -1220,7 +1220,7 @@ 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);
@@ -1228,13 +1228,13 @@ static int sdw_slave_set_frequency(struct sdw_slave *slave)
 	}
 
 	/* 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);
-- 
2.26.2