Backported from Code Aurora QSDK
Signed-off-by: Vittorio Gambaletta <open...@vittgam.net>
---
.../linux/ar71xx/files/arch/mips/ath79/dev-eth.c | 5 +++++
.../mips/include/asm/mach-ath79/ag71xx_platform.h | 2 +-
.../net/ethernet/atheros/ag71xx/ag71xx_main.c | 16 ++++++++++++++++
3 files changed, 22 insertions(+), 1 deletion(-)
diff --git a/target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c
b/target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c
index a8b19b6..427de6a 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c
+++ b/target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c
@@ -996,6 +996,9 @@ void __init ath79_register_eth(unsigned int id)
pdata->reset_bit = AR934X_RESET_GE0_MAC |
AR934X_RESET_GE0_MDIO;
pdata->set_speed = ar934x_set_speed_ge0;
+
+ if (ath79_soc == ATH79_SOC_QCA9533)
+ pdata->disable_inline_checksum_engine = 1;
} else {
pdata->reset_bit = AR934X_RESET_GE1_MAC |
AR934X_RESET_GE1_MDIO;
@@ -1097,6 +1100,8 @@ void __init ath79_register_eth(unsigned int id)
pdata->set_speed = qca956x_set_speed_sgmii;
else
pdata->set_speed = ar934x_set_speed_ge0;
+
+ pdata->disable_inline_checksum_engine = 1;
} else {
pdata->reset_bit = QCA955X_RESET_GE1_MAC |
QCA955X_RESET_GE1_MDIO;
diff --git
a/target/linux/ar71xx/files/arch/mips/include/asm/mach-ath79/ag71xx_platform.h
b/target/linux/ar71xx/files/arch/mips/include/asm/mach-ath79/ag71xx_platform.h
index 078fa15..5fdc59c 100644
---
a/target/linux/ar71xx/files/arch/mips/include/asm/mach-ath79/ag71xx_platform.h
+++
b/target/linux/ar71xx/files/arch/mips/include/asm/mach-ath79/ag71xx_platform.h
@@ -37,7 +37,7 @@ struct ag71xx_platform_data {
u8 is_ar724x:1;
u8 has_ar8216:1;
u8 use_flow_control:1;
- u8 is_qca956x:1;
+ u8 disable_inline_checksum_engine:1;
struct ag71xx_switch_platform_data *switch_data;
diff --git
a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
index 566e951..72dd654 100644
---
a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
+++
b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
@@ -629,6 +629,22 @@ __ag71xx_link_adjust(struct ag71xx *ag, bool update)
ag71xx_wr(ag, AG71XX_REG_MAC_CFG2, cfg2);
ag71xx_wr(ag, AG71XX_REG_FIFO_CFG5, fifo5);
ag71xx_wr(ag, AG71XX_REG_MAC_IFCTL, ifctl);
+
+ if (pdata->disable_inline_checksum_engine) {
+ /*
+ * The rx ring buffer can stall on small packets on QCA953x and
+ * QCA956x. Disabling the inline checksum engine fixes the
stall.
+ * The wr, rr functions cannot be used since this hidden
register
+ * is outside of the normal ag71xx register block.
+ */
+ void __iomem *dam = ioremap_nocache(0xb90001bc, 0x4);
+ if (dam) {
+ __raw_writel(__raw_readl(dam) & ~BIT(27), dam);
+ (void)__raw_readl(dam);
+ iounmap(dam);
+ }
+ }
+
ag71xx_hw_start(ag);
netif_carrier_on(ag->dev);
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