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Add delay to Octeon MDIO access routines.

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Prevent saturattion of the bus by constant polling which in
extreme cases can cause interface lockup. This makes FreeBSD
match similar case in the executive.
This commit is contained in:
kan 2014-09-14 00:02:37 +00:00
parent 5f36980b65
commit fff5c2c5e1
1 changed files with 2 additions and 0 deletions
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2
sys/mips/cavium/octe/ethernet-mdio.c
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@ -71,6 +71,7 @@ int cvm_oct_mdio_read(struct ifnet *ifp, int phy_id, int location)
cvmx_write_csr(CVMX_SMI_CMD, smi_cmd.u64);
do {
cvmx_wait(1000);
smi_rd.u64 = cvmx_read_csr(CVMX_SMI_RD_DAT);
} while (smi_rd.s.pending);
@ -108,6 +109,7 @@ void cvm_oct_mdio_write(struct ifnet *ifp, int phy_id, int location, int val)
cvmx_write_csr(CVMX_SMI_CMD, smi_cmd.u64);
do {
cvmx_wait(1000);
smi_wr.u64 = cvmx_read_csr(CVMX_SMI_WR_DAT);
} while (smi_wr.s.pending);
MDIO_UNLOCK();