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@xxxxxxx>
---
Cc: Peter Rosin <peda@xxxxxxxxxx>
Cc: Wolfram Sang <wsa@xxxxxxxxxx>
Cc: linux-i2c@xxxxxxxxxxxxxxx
---
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
