openwrt/target/linux/ath79/patches-6.1/720-mdio_bitbang_ignore_ta_value.patch

From: Jonas Gorski <[email protected]>
Subject: ar71xx: add a workaround for ar8316 not always driving the TA bit to low

AR8316 behind a GPIO bitbanged MDIO bus fails to drive the turnaround bit
to low despite returning a valid value. Ignore it and just use the
returned value anyway.

SVN-Revision: 28422
---
 drivers/net/mdio/mdio-bitbang.c               | 16 ++-----------------
 1 file changed, 2 insertions(+), 14 deletions(-)

--- a/drivers/net/mdio/mdio-bitbang.c
+++ b/drivers/net/mdio/mdio-bitbang.c
@@ -152,7 +152,7 @@ static int mdiobb_cmd_addr(struct mdiobb
 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);
@@ -162,19 +162,7 @@ int mdiobb_read(struct mii_bus *bus, int
 
 	ctrl->ops->set_mdio_dir(ctrl, 0);
 
-	/* check the turnaround bit: the PHY should be driving it to zero, if this
-	 * PHY is listed in phy_ignore_ta_mask as having broken TA, skip that
-	 */
-	if (mdiobb_get_bit(ctrl) != 0 &&
-	    !(bus->phy_ignore_ta_mask & (1 << phy))) {
-		/* 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);