usb: typec: intel_pmc_mux: Definitions for response status bits

Adding definitions for the two status bits that we have in
the command response data structure.

Also, from now on only considering the second status bit,
which tells was the failure fatal or not, if the first bit
is set. If the first bit is not set, then the command was
successful, and we need to ignore the second bit.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20200701115618.22482-4-heikki.krogerus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/mux/intel_pmc_mux.c

@@ -19,6 +19,10 @@
 
 #define PMC_USBC_CMD		0xa7
 
+/* Response status bits */
+#define PMC_USB_RESP_STATUS_FAILURE	BIT(0)
+#define PMC_USB_RESP_STATUS_FATAL	BIT(1)
+
 /* "Usage" OOB Message field values */
 enum {
 	PMC_USB_CONNECT,
@@ -130,8 +134,8 @@ static int pmc_usb_command(struct pmc_usb_port *port, u8 *msg, u32 len)
 	 */
 	intel_scu_ipc_dev_command(port->pmc->ipc, PMC_USBC_CMD, 0, msg, len,
 				  response, sizeof(response));
-	if (response[2]) {
-		if (response[2] & BIT(1))
+	if (response[2] & PMC_USB_RESP_STATUS_FAILURE) {
+		if (response[2] & PMC_USB_RESP_STATUS_FATAL)
 			return -EIO;
 		return -EBUSY;
 	}