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>

diff --git a/drivers/net/ethernet/qualcomm/emac/emac-phy.c b/drivers/net/ethernet/qualcomm/emac/emac-phy.c
index 18461fcb981501efd7015634999cb787041c01a7..53dbf1e163a85ea5bdfc571788c18ce0d6d0f7b3 100644 (file)
--- a/drivers/net/ethernet/qualcomm/emac/emac-phy.c
+++ b/drivers/net/ethernet/qualcomm/emac/emac-phy.c
@@ -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;