Add delay to Octeon MDIO access routines.

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.

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/mips/cavium/octe/ethernet-mdio.c b/sys/mips/cavium/octe/ethernet-mdio.c
index d95669a..c61a2a6 100644
--- a/sys/mips/cavium/octe/ethernet-mdio.c
+++ b/sys/mips/cavium/octe/ethernet-mdio.c
@@ -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();