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Commit 043ee1de authored by Hemanth Puranik's avatar Hemanth Puranik Committed by David S. Miller
Browse files

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: default avatarHemanth Puranik <hpuranik@codeaurora.org>
Acked-by: default avatarTimur Tabi <timur@codeaurora.org>
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b59e6979

drivers/net/ethernet/qualcomm/emac/emac-phy.c

+4 −3
Original line number Diff line number Diff line
@@ -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;