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net: qcom/emac: Reduce timeout for mdio read/write 

Currently mdio read/write takes around ~115us as the timeout
between status check is set to 100us.
By reducing the timeout to 1us mdio read/write takes ~15us to
complete. This improves the link up event response.

Signed-off-by: Hemanth Puranik <hpuranik@codeaurora.org>
Acked-by: Timur Tabi <timur@codeaurora.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Hemanth Puranik 2017-12-15 20:05:58 +05:30 committed by David S. Miller
parent b59e6979a8
commit 043ee1debd
1 changed files with 4 additions and 3 deletions
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7
drivers/net/ethernet/qualcomm/emac/emac-phy.c
View File

@ -47,6 +47,7 @@
#define MDIO_CLK_25_28 7
#define MDIO_WAIT_TIMES 1000
#define MDIO_STATUS_DELAY_TIME 1
static int emac_mdio_read(struct mii_bus *bus, int addr, int regnum)
{
@ -65,7 +66,7 @@ static int emac_mdio_read(struct mii_bus *bus, int addr, int regnum)
if (readl_poll_timeout(adpt->base + EMAC_MDIO_CTRL, reg,
!(reg & (MDIO_START | MDIO_BUSY)),
100, MDIO_WAIT_TIMES * 100))
MDIO_STATUS_DELAY_TIME, MDIO_WAIT_TIMES * 100))
return -EIO;
return (reg >> MDIO_DATA_SHFT) & MDIO_DATA_BMSK;
@ -88,8 +89,8 @@ static int emac_mdio_write(struct mii_bus *bus, int addr, int regnum, u16 val)
writel(reg, adpt->base + EMAC_MDIO_CTRL);
if (readl_poll_timeout(adpt->base + EMAC_MDIO_CTRL, reg,
!(reg & (MDIO_START | MDIO_BUSY)), 100,
MDIO_WAIT_TIMES * 100))
!(reg & (MDIO_START | MDIO_BUSY)),
MDIO_STATUS_DELAY_TIME, MDIO_WAIT_TIMES * 100))
return -EIO;
return 0;