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

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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>
This commit is contained in:
David Daney 2011-04-27 10:54:21 -07:00 committed by Greg Kroah-Hartman
parent f5ced99725
commit bf54171521
1 changed files with 3 additions and 1 deletions
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4
drivers/usb/host/octeon2-common.c
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@ -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);
}