platform/chrome: cros_ec_typec: Tolerate unrecognized mux flags

On occasion, the Chrome Embedded Controller (EC) can send a mux
configuration which doesn't map to a particular data mode. For instance,
dedicated Type C chargers, when connected, may cause only
USB_PD_MUX_POLARITY_INVERTED to be set. This is a valid flag combination
and should not lead to a driver abort.

Modify the mux configuration handling to not return an error when an
unrecognized mux flag combination is encountered. Concordantly, make the
ensuing print a debug level print so as to not pollute the kernel logs.

Cc: Keith Short <keithshort@chromium.org>
Signed-off-by: Prashant Malani <pmalani@chromium.org>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Benson Leung <bleung@chromium.org>
Link: https://lore.kernel.org/r/20201106020305.767202-1-pmalani@chromium.org

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index ce031a1..5b8db02 100644 (file)
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -537,10 +537,9 @@ static int cros_typec_configure_mux(struct cros_typec_data *typec, int port_num,
                port->state.mode = TYPEC_STATE_USB;
                ret = typec_mux_set(port->mux, &port->state);
        } else {
-               dev_info(typec->dev,
-                        "Unsupported mode requested, mux flags: %x\n",
-                        mux_flags);
-               ret = -ENOTSUPP;
+               dev_dbg(typec->dev,
+                       "Unrecognized mode requested, mux flags: %x\n",
+                       mux_flags);
        }
 
        return ret;