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authorJonas Gorski <jogo@openwrt.org>2011-10-11 23:05:13 +0000
committerJonas Gorski <jogo@openwrt.org>2011-10-11 23:05:13 +0000
commit2b7dfdc5ef94138f470a25b7c83de1cd94768321 (patch)
treeea68de68f960f60a26b64b058b8f02e9e910ee93 /target/linux/ar71xx
parent05fbd33f9f1bf3d1f53a11269e2f907a14b5d9bd (diff)
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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. git-svn-id: svn://svn.openwrt.org/openwrt/trunk@28422 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/ar71xx')
-rw-r--r--target/linux/ar71xx/patches-2.6.39/920-mdio_bitbang_ignore_ta_value.patch20
1 files changed, 20 insertions, 0 deletions
diff --git a/target/linux/ar71xx/patches-2.6.39/920-mdio_bitbang_ignore_ta_value.patch b/target/linux/ar71xx/patches-2.6.39/920-mdio_bitbang_ignore_ta_value.patch
new file mode 100644
index 0000000000..39584aabfa
--- /dev/null
+++ b/target/linux/ar71xx/patches-2.6.39/920-mdio_bitbang_ignore_ta_value.patch
@@ -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);