diff options
| author | Justin Chen <justin.chen@broadcom.com> | 2023-12-14 01:27:43 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2023-12-15 04:58:58 +0300 |
| commit | 268531be211f18c55f7ff5a1641d32c0fd0571cd (patch) | |
| tree | 75e0ff73da70065d95ea3af9a196a7e520e3294e /drivers/net/mdio | |
| parent | c2d919cdfe56de1b3ba0ec019e6367957dd39f14 (diff) | |
| download | linux-268531be211f18c55f7ff5a1641d32c0fd0571cd.tar.xz | |
net: mdio: mdio-bcm-unimac: Delay before first poll
With a clock interval of 400 nsec and a 64 bit transactions (32 bit
preamble & 16 bit control & 16 bit data), it is reasonable to assume
the mdio transaction will take 25.6 usec. Add a 30 usec delay before
the first poll to reduce the chance of a 1000-2000 usec sleep.
Reduce the timeout from 1000ms to 100ms as it is unlikely for the bus
to take this long.
Signed-off-by: Justin Chen <justin.chen@broadcom.com>
Acked-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20231213222744.2891184-2-justin.chen@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/mdio')
| -rw-r--r-- | drivers/net/mdio/mdio-bcm-unimac.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/net/mdio/mdio-bcm-unimac.c b/drivers/net/mdio/mdio-bcm-unimac.c index e8cd8eef319b..297ea4a58d79 100644 --- a/drivers/net/mdio/mdio-bcm-unimac.c +++ b/drivers/net/mdio/mdio-bcm-unimac.c @@ -81,7 +81,13 @@ static inline unsigned int unimac_mdio_busy(struct unimac_mdio_priv *priv) static int unimac_mdio_poll(void *wait_func_data) { struct unimac_mdio_priv *priv = wait_func_data; - unsigned int timeout = 1000; + unsigned int timeout = 100; + + /* + * C22 transactions should take ~25 usec, will need to adjust + * if C45 support is added. + */ + udelay(30); do { if (!unimac_mdio_busy(priv)) |