| Message ID | 1442003149-10717-1-git-send-email-sjoerd.simons@collabora.co.uk |
|---|---|
| State | New |
| Headers | show |
From: Sjoerd Simons <sjoerd.simons@collabora.co.uk> Date: Fri, 11 Sep 2015 22:25:48 +0200 > The reset delays used for stmmac are in the order of 10ms to 1 second, > which is far too long for udelay usage, so switch to using msleep. > > Practically this fixes the PHY not being reliably detected in some cases > as udelay wouldn't actually delay for long enough to let the phy > reliably be reset. > > Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk> Applied, thanks. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c index b735fa2..ebf6abc 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c @@ -161,11 +161,16 @@ int stmmac_mdio_reset(struct mii_bus *bus) if (!gpio_request(reset_gpio, "mdio-reset")) { gpio_direction_output(reset_gpio, active_low ? 1 : 0); - udelay(data->delays[0]); + if (data->delays[0]) + msleep(DIV_ROUND_UP(data->delays[0], 1000)); + gpio_set_value(reset_gpio, active_low ? 0 : 1); - udelay(data->delays[1]); + if (data->delays[1]) + msleep(DIV_ROUND_UP(data->delays[1], 1000)); + gpio_set_value(reset_gpio, active_low ? 1 : 0); - udelay(data->delays[2]); + if (data->delays[2]) + msleep(DIV_ROUND_UP(data->delays[2], 1000)); } } #endif
The reset delays used for stmmac are in the order of 10ms to 1 second, which is far too long for udelay usage, so switch to using msleep. Practically this fixes the PHY not being reliably detected in some cases as udelay wouldn't actually delay for long enough to let the phy reliably be reset. Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk> --- Changes in v2: - Use DIV_ROUND_UP instead of handcoding the same drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-)