diff options
Diffstat (limited to 'target/linux')
| -rw-r--r-- | target/linux/ath79/patches-5.4/930-ar8216-make-reg-access-atomic.patch | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/target/linux/ath79/patches-5.4/930-ar8216-make-reg-access-atomic.patch b/target/linux/ath79/patches-5.4/930-ar8216-make-reg-access-atomic.patch new file mode 100644 index 0000000000..02f763534e --- /dev/null +++ b/target/linux/ath79/patches-5.4/930-ar8216-make-reg-access-atomic.patch @@ -0,0 +1,59 @@ +From b3797d1a92afe97c173b00fdb7824cedba24eef0 Mon Sep 17 00:00:00 2001 +From: Chuanhong Guo <gch981213@gmail.com> +Date: Sun, 20 Sep 2020 01:00:45 +0800 +Subject: [PATCH] ath79: ar8216: make switch register access atomic + +due to some unknown reason these register accesses sometimes fail +on the integrated switch without this patch. + +THIS ONLY WORKS ON ATH79 AND MAY BREAK THE DRIVER ON OTHER PLATFORMS! +The mdio bus on ath79 works in polling mode and doesn't rely on +any interrupt. This patch breaks the driver on any mdio master +with interrupts used. + +--- +--- a/drivers/net/phy/ar8216.c ++++ b/drivers/net/phy/ar8216.c +@@ -252,6 +252,7 @@ ar8xxx_mii_write32(struct ar8xxx_priv *p + u32 + ar8xxx_read(struct ar8xxx_priv *priv, int reg) + { ++ unsigned long flags; + struct mii_bus *bus = priv->mii_bus; + u16 r1, r2, page; + u32 val; +@@ -259,11 +260,13 @@ ar8xxx_read(struct ar8xxx_priv *priv, in + split_addr((u32) reg, &r1, &r2, &page); + + mutex_lock(&bus->mdio_lock); ++ local_irq_save(flags); + + bus->write(bus, 0x18, 0, page); + wait_for_page_switch(); + val = ar8xxx_mii_read32(priv, 0x10 | r2, r1); + ++ local_irq_restore(flags); + mutex_unlock(&bus->mdio_lock); + + return val; +@@ -272,17 +275,20 @@ ar8xxx_read(struct ar8xxx_priv *priv, in + void + ar8xxx_write(struct ar8xxx_priv *priv, int reg, u32 val) + { ++ unsigned long flags; + struct mii_bus *bus = priv->mii_bus; + u16 r1, r2, page; + + split_addr((u32) reg, &r1, &r2, &page); + + mutex_lock(&bus->mdio_lock); ++ local_irq_save(flags); + + bus->write(bus, 0x18, 0, page); + wait_for_page_switch(); + ar8xxx_mii_write32(priv, 0x10 | r2, r1, val); + ++ local_irq_restore(flags); + mutex_unlock(&bus->mdio_lock); + } + |