ath79: add 5.15 support for generic subtarget

Add Kernel 5.15 patches + config. This is currently only available for
the generic subtarget, as it was exclusively tested with this target.

Tested-on: Siemens WS-AP3610, Enterasys WS-AP3705i

Signed-off-by: David Bauer <mail@david-bauer.net>

1 files changed, 61 insertions, 0 deletions

diff --git a/target/linux/ath79/patches-5.15/901-phy-mdio-bitbang-prevent-rescheduling-during-command.patch b/target/linux/ath79/patches-5.15/901-phy-mdio-bitbang-prevent-rescheduling-during-command.patch
new file mode 100644
index 0000000000..e37d9a1f63
--- /dev/null
+++ b/target/linux/ath79/patches-5.15/901-phy-mdio-bitbang-prevent-rescheduling-during-command.patch
@@ -0,0 +1,61 @@
+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>
+@@ -153,7 +154,9 @@ int mdiobb_read(struct mii_bus *bus, int
+ {
+ 	struct mdiobb_ctrl *ctrl = bus->priv;
+ 	int ret;
++	unsigned long flags;
+ 
++	local_irq_save(flags);
+ 	if (reg & MII_ADDR_C45) {
+ 		reg = mdiobb_cmd_addr(ctrl, phy, reg);
+ 		mdiobb_cmd(ctrl, MDIO_C45_READ, phy, reg);
+@@ -166,6 +169,7 @@ int mdiobb_read(struct mii_bus *bus, int
+ 
+ 	ret = mdiobb_get_num(ctrl, 16);
+ 	mdiobb_get_bit(ctrl);
++	local_irq_restore(flags);
+ 	return ret;
+ }
+ EXPORT_SYMBOL(mdiobb_read);
+@@ -173,7 +177,9 @@ EXPORT_SYMBOL(mdiobb_read);
+ int mdiobb_write(struct mii_bus *bus, int phy, int reg, u16 val)
+ {
+ 	struct mdiobb_ctrl *ctrl = bus->priv;
++	unsigned long flags;
+ 
++	local_irq_save(flags);
+ 	if (reg & MII_ADDR_C45) {
+ 		reg = mdiobb_cmd_addr(ctrl, phy, reg);
+ 		mdiobb_cmd(ctrl, MDIO_C45_WRITE, phy, reg);
+@@ -188,6 +194,8 @@ int mdiobb_write(struct mii_bus *bus, in
+ 
+ 	ctrl->ops->set_mdio_dir(ctrl, 0);
+ 	mdiobb_get_bit(ctrl);
++	local_irq_restore(flags);
++
+ 	return 0;
+ }
+ EXPORT_SYMBOL(mdiobb_write);