[PATCH 1/2] i2c: mux: pca954x: Make sure the mux remains configured the same as before resume

[Marek Vasut <marex@denx.de>]

The current implementation of pca954x_init() rewrites content of data->last_chan
which is then populated into the mux select register. Skip this part, so that the
mux is populated with content of data->last_chan as it was set before suspend.
This way, the mux state is retained across suspend/resume cycle.

Fixes: e65e228eb096 ("i2c: mux: pca954x: support property idle-state")
Signed-off-by: Marek Vasut <marex@denx.de>
---
Cc: Peter Rosin <peda@axentia.se>
Cc: Wolfram Sang <wsa@kernel.org>
Cc: linux-i2c@vger.kernel.org
---
 drivers/i2c/muxes/i2c-mux-pca954x.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c
index 2219062104fbc..97cf475dde0f4 100644
--- a/drivers/i2c/muxes/i2c-mux-pca954x.c
+++ b/drivers/i2c/muxes/i2c-mux-pca954x.c
@@ -620,9 +620,9 @@ static int pca954x_resume(struct device *dev)
 	struct pca954x *data = i2c_mux_priv(muxc);
 	int ret;
 
-	ret = pca954x_init(client, data);
+	ret = i2c_smbus_write_byte(client, data->last_chan);
 	if (ret < 0)
-		dev_err(&client->dev, "failed to verify mux presence\n");
+		dev_err(&client->dev, "failed to restore mux state\n");
 
 	return ret;
 }
-- 
2.40.1