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drivers: net: fsl_enetc_mdio: return with time-out if HW is stuck

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On some boards MDIO may get stuck if it detects echo on the line.  This is
a know hardware issue, there is a board fix for it.  In case we're running
on a board that doesn't have the fix, we don't want to loop here forever
and freeze U-Boot.

Signed-off-by: Alex Marginean <alexandru.marginean@nxp.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
This commit is contained in:
Alex Marginean 2019-11-14 18:58:47 +02:00 committed by Joe Hershberger
parent a931f78307
commit 6c96446859
1 changed files with 6 additions and 1 deletions
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7
drivers/net/fsl_enetc_mdio.c
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@ -17,8 +17,13 @@
static void enetc_mdio_wait_bsy(struct enetc_mdio_priv *priv)
{
while (enetc_read(priv, ENETC_MDIO_CFG) & ENETC_EMDIO_CFG_BSY)
int to = 10000;
while ((enetc_read(priv, ENETC_MDIO_CFG) & ENETC_EMDIO_CFG_BSY) &&
--to)
cpu_relax();
if (!to)
printf("T");
}
int enetc_mdio_read_priv(struct enetc_mdio_priv *priv, int addr, int devad,