[OpenWrt-Devel] [RFC v2 5/6] ag71xx: Disable classification of fragmented packets on QCA955x

[Sven Eckelmann]

From: Sven Eckelmann <sven.eckelmann at open-mesh.com>

The QCA955x SoC family tends to hang randomly on GMAC0 when the link
speeds+duplex modes are changed. QCA recommended to disable the
classification of fragmented packets for QCA to avoid this problem.

Signed-off-by: Sven Eckelmann <sven.eckelmann at open-mesh.com>
---
v2:
 - Split into multiple patches and adjust slightly to look more like an
   OpenWrt patch

 .../linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h  | 5 +++++
 .../ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c   | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h
index 5d03dcf..454b4c2 100644
--- a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h
+++ b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h
@@ -259,6 +259,10 @@ ag71xx_ring_size_order(int size)
 #define AG71XX_REG_RX_SM	0x01b0
 #define AG71XX_REG_TX_SM	0x01b4
 
+#define QCA955X_REG_IG_ACL	0x23c
+
+#define QCA955X_FRA_DISABLE	0x60000000
+
 #define MAC_CFG1_TXE		BIT(0)	/* Tx Enable */
 #define MAC_CFG1_STX		BIT(1)	/* Synchronize Tx Enable */
 #define MAC_CFG1_RXE		BIT(2)	/* Rx Enable */
@@ -376,6 +380,7 @@ static inline void ag71xx_check_reg_offset(struct ag71xx *ag, unsigned reg)
 	case AG71XX_REG_MAC_CFG1 ... AG71XX_REG_MAC_MFL:
 	case AG71XX_REG_MAC_IFCTL ... AG71XX_REG_TX_SM:
 	case AG71XX_REG_MII_CFG:
+	case QCA955X_REG_IG_ACL:
 		break;
 
 	default:
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 38226cf..0832059 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
@@ -474,6 +474,9 @@ static void ag71xx_hw_setup(struct ag71xx *ag)
 	}
 	ag71xx_wr(ag, AG71XX_REG_FIFO_CFG4, FIFO_CFG4_INIT);
 	ag71xx_wr(ag, AG71XX_REG_FIFO_CFG5, FIFO_CFG5_INIT);
+
+	if (pdata->is_qca955x && pdata->gmac_num == 0)
+		ag71xx_sb(ag, QCA955X_REG_IG_ACL, QCA955X_FRA_DISABLE);
 }
 
 static void ag71xx_hw_init(struct ag71xx *ag)
-- 
2.8.0.rc3
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