Additional PHY tuning is needed to obtain compliant 'eye' diagram
electrical characteristics.
Signed-off-by: David Daney <ddaney@xxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/octeon2-common.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/drivers/usb/host/octeon2-common.c b/drivers/usb/host/octeon2-common.c
index 5a0feed..aef6364 100644
--- a/drivers/usb/host/octeon2-common.c
+++ b/drivers/usb/host/octeon2-common.c
@@ -176,8 +176,10 @@ end_clock:
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);
}
--
1.7.2.3
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