From: Hemanth Puranik <hpuranik@codeaurora.org>
Date: Fri, 15 Dec 2017 14:35:58 +0000 (+0530)
Subject: net: qcom/emac: Reduce timeout for mdio read/write
X-Git-Tag: v4.15-rc4~13^2
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=043ee1debd0b29c16c4c4b11a348ca667bfe9144;p=users%2Fwilly%2Flinux.git
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 18461fcb9815..53dbf1e163a8 100644
--- 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;