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ar71xx: add a workaround for ar8316 not always driving the TA bit to low

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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
This commit is contained in:
Jonas Gorski 2011-10-11 23:05:13 +00:00
parent b7a2a74823
commit 03f91068d1
1 changed files with 20 additions and 0 deletions
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20
target/linux/ar71xx/patches-2.6.39/920-mdio_bitbang_ignore_ta_value.patch Normal file
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@ -0,0 +1,20 @@
--- a/drivers/net/phy/mdio-bitbang.c
+++ b/drivers/net/phy/mdio-bitbang.c
@@ -165,16 +165,7 @@ static int mdiobb_read(struct mii_bus *b
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);