usb: octeon2-common.c: Configure ports for proper electrical characteristics.

Additional PHY tuning is needed to obtain compliant 'eye' diagram
electrical characteristics.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/octeon2-common.c

@@ -176,8 +176,10 @@ void octeon2_usb_clocks_start(void)
 	for (i = 0; i <= 1; i++) {
 		port_ctl_status.u64 =
 			cvmx_read_csr(CVMX_UCTLX_UPHY_PORTX_CTL_STATUS(i, 0));
-		/* Set txvreftune to 15 to obtain complient 'eye' diagram. */
+		/* Set txvreftune to 15 to obtain compliant 'eye' diagram. */
 		port_ctl_status.s.txvreftune = 15;
+		port_ctl_status.s.txrisetune = 1;
+		port_ctl_status.s.txpreemphasistune = 1;
 		cvmx_write_csr(CVMX_UCTLX_UPHY_PORTX_CTL_STATUS(i, 0),
 			       port_ctl_status.u64);
 	}