Openwrt/target/linux/ath79/patches-4.19/901-phy-mdio-bitbang-prevent-rescheduling-during-command.patch
Chuanhong Guo 3771176c9e ath79: add support for linux 4.19
The following patches are dropped because they are merged upstream:
-0001-tty-serial-drop-QCA-pecific-SoC-symbols.patch
-0006-usb-drop-deprecated-symbols.patch
-0009-MIPS-ath79-add-lots-of-missing-registers.patch
-0010-MIPS-ath79-add-support-for-QCA953x-QCA956x-TP9343.patch
-0014-MIPS-ath79-finetune-cpu-overrides.patch
-0015-MIPS-ath79-enable-uart-during-early_prink.patch
-0016-MIPS-ath79-get-PCIe-controller-out-of-reset.patch

This patch is dropped due to the introduction of spi-mem framework:
-461-spi-ath79-add-fast-flash-read.patch

Thank to Michael Marley @mamarley for his work on this patch:
-910-unaligned_access_hacks.patch

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
[synchronized kernel config with make kernel_oldconfig]
Signed-off-by: Petr Štetiar <ynezz@true.cz>
2019-03-24 01:44:25 +01:00

62 lines
1.7 KiB
Diff

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/phy/mdio-bitbang.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/drivers/net/phy/mdio-bitbang.c
+++ b/drivers/net/phy/mdio-bitbang.c
@@ -17,6 +17,7 @@
* kind, whether express or implied.
*/
+#include <linux/irqflags.h>
#include <linux/module.h>
#include <linux/mdio-bitbang.h>
#include <linux/types.h>
@@ -156,7 +157,9 @@ static int mdiobb_read(struct mii_bus *b
{
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);
@@ -169,13 +172,17 @@ static int mdiobb_read(struct mii_bus *b
ret = mdiobb_get_num(ctrl, 16);
mdiobb_get_bit(ctrl);
+ local_irq_restore(flags);
+
return ret;
}
static 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);
@@ -190,6 +197,8 @@ static int mdiobb_write(struct mii_bus *
ctrl->ops->set_mdio_dir(ctrl, 0);
mdiobb_get_bit(ctrl);
+ local_irq_restore(flags);
+
return 0;
}