openadk/target/mips/mikrotik-rb4xx/patches/3.14.26/0016-phy-mdio-bitbang-ignore-TA-value.patch

From e73f7d9a658c7fc693a9b9c45a1f65c014dd6e40 Mon Sep 17 00:00:00 2001
From: Phil Sutter <phil@nwl.cc>
Date: Tue, 13 May 2014 01:17:38 +0200
Subject: [PATCH] phy: mdio-bitbang: ignore TA value

This is necessary on rb493g to make the kernel detect the second switch.
---
 drivers/net/phy/mdio-bitbang.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/drivers/net/phy/mdio-bitbang.c b/drivers/net/phy/mdio-bitbang.c
index daec9b0..4fa2be0 100644
--- a/drivers/net/phy/mdio-bitbang.c
+++ b/drivers/net/phy/mdio-bitbang.c
@@ -155,7 +155,7 @@ static int mdiobb_cmd_addr(struct mdiobb_ctrl *ctrl, int phy, u32 addr)
 static int mdiobb_read(struct mii_bus *bus, int phy, int reg)
 {
 	struct mdiobb_ctrl *ctrl = bus->priv;
-	int ret, i;
+	int ret;
 
 	if (reg & MII_ADDR_C45) {
 		reg = mdiobb_cmd_addr(ctrl, phy, reg);
@@ -165,16 +165,7 @@ static int mdiobb_read(struct mii_bus *bus, int phy, int reg)
 
 	ctrl->ops->set_mdio_dir(ctrl, 0);
 
-	/* check the turnaround bit: the PHY should be driving it to zero */
-	if (mdiobb_get_bit(ctrl) != 0) {
-		/* PHY didn't drive TA low -- flush any bits it
-		 * may be trying to send.
-		 */
-		for (i = 0; i < 32; i++)
-			mdiobb_get_bit(ctrl);
-
-		return 0xffff;
-	}
+	mdiobb_get_bit(ctrl);
 
 	ret = mdiobb_get_num(ctrl, 16);
 	mdiobb_get_bit(ctrl);
-- 
1.8.5.3