Initial commit

target/linux/ath79/patches-6.6/721-phy-mdio-bitbang-prevent-rescheduling-during-command.patch

@@ -0,0 +1,94 @@
+From 66e584435ac0de6e0abeb6d7166fe4fe25d6bb73 Mon Sep 17 00:00:00 2001
+From: Jonas Gorski <jogo@openwrt.org>
+Date: Tue, 16 Jun 2015 13:15:08 +0200
+Subject: [PATCH] phy/mdio-bitbang: prevent rescheduling during command
+
+It seems some phys have some maximum timings for accessing the MDIO line,
+resulting in bit errors under cpu stress. Prevent this from happening by
+disabling interrupts when sending commands.
+
+Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+---
+ drivers/net/mdio/mdio-bitbang.c | 9 +++++++++
+ 1 file changed, 9 insertions(+)
+
+--- a/drivers/net/mdio/mdio-bitbang.c
++++ b/drivers/net/mdio/mdio-bitbang.c
+@@ -14,6 +14,7 @@
+  * Vitaly Bordug <vbordug@ru.mvista.com>
+  */
+ 
++#include <linux/irqflags.h>
+ #include <linux/delay.h>
+ #include <linux/mdio-bitbang.h>
+ #include <linux/module.h>
+@@ -161,22 +162,32 @@ static int mdiobb_read_common(struct mii
+ 
+ int mdiobb_read_c22(struct mii_bus *bus, int phy, int reg)
+ {
++	int ret;
++	unsigned long flags;
+ 	struct mdiobb_ctrl *ctrl = bus->priv;
+ 
++	local_irq_save(flags);
+ 	mdiobb_cmd(ctrl, ctrl->op_c22_read, phy, reg);
+ 
+-	return mdiobb_read_common(bus, phy);
++	ret = mdiobb_read_common(bus, phy);
++	local_irq_restore(flags);
++	return ret;
+ }
+ EXPORT_SYMBOL(mdiobb_read_c22);
+ 
+ int mdiobb_read_c45(struct mii_bus *bus, int phy, int devad, int reg)
+ {
++	int ret;
++	unsigned long flags;
+ 	struct mdiobb_ctrl *ctrl = bus->priv;
+ 
++	local_irq_save(flags);
+ 	mdiobb_cmd_addr(ctrl, phy, devad, reg);
+ 	mdiobb_cmd(ctrl, MDIO_C45_READ, phy, devad);
+ 
+-	return mdiobb_read_common(bus, phy);
++	ret = mdiobb_read_common(bus, phy);
++	local_irq_restore(flags);
++	return ret;
+ }
+ EXPORT_SYMBOL(mdiobb_read_c45);
+ 
+@@ -197,22 +208,32 @@ static int mdiobb_write_common(struct mi
+ 
+ int mdiobb_write_c22(struct mii_bus *bus, int phy, int reg, u16 val)
+ {
++	int ret;
++	unsigned long flags;
+ 	struct mdiobb_ctrl *ctrl = bus->priv;
+ 
++	local_irq_save(flags);
+ 	mdiobb_cmd(ctrl, ctrl->op_c22_write, phy, reg);
+ 
+-	return mdiobb_write_common(bus, val);
++	ret = mdiobb_write_common(bus, val);
++	local_irq_restore(flags);
++	return ret;
+ }
+ EXPORT_SYMBOL(mdiobb_write_c22);
+ 
+ int mdiobb_write_c45(struct mii_bus *bus, int phy, int devad, int reg, u16 val)
+ {
++	int ret;
++	unsigned long flags;
+ 	struct mdiobb_ctrl *ctrl = bus->priv;
+ 
++	local_irq_save(flags);
+ 	mdiobb_cmd_addr(ctrl, phy, devad, reg);
+ 	mdiobb_cmd(ctrl, MDIO_C45_WRITE, phy, devad);
+ 
+-	return mdiobb_write_common(bus, val);
++	ret = mdiobb_write_common(bus, val);
++	local_irq_restore(flags);
++	return ret;
+ }
+ EXPORT_SYMBOL(mdiobb_write_c45);
+