diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/701-net-0327-at803x-Address-packet-drops-at-low-traffic-rate-due-.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/701-net-0327-at803x-Address-packet-drops-at-low-traffic-rate-due-.patch | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/701-net-0327-at803x-Address-packet-drops-at-low-traffic-rate-due-.patch b/target/linux/layerscape/patches-5.4/701-net-0327-at803x-Address-packet-drops-at-low-traffic-rate-due-.patch new file mode 100644 index 0000000000..f6cf0e0430 --- /dev/null +++ b/target/linux/layerscape/patches-5.4/701-net-0327-at803x-Address-packet-drops-at-low-traffic-rate-due-.patch @@ -0,0 +1,86 @@ +From 53c3bd0d5a873c23841bb95e7b95c1c3630c50bd Mon Sep 17 00:00:00 2001 +From: Vladimir Oltean <vladimir.oltean@nxp.com> +Date: Thu, 12 Jul 2018 13:03:13 +0300 +Subject: [PATCH] at803x: Address packet drops at low traffic rate due to + SmartEEE feature + +* According to the AR8035 datasheet, smartEEE mode (active by default) + makes the PHY enters sleep after a configurable idle time. It does + this autonomously, without LPI (Low Power Idle) signals coming from MAC. +* Tested with ping (default of 1 second interval) over back-to-back + RGMII between 2 boards having AR8035 at both ends: + - Without patch: + 225 packets transmitted, 145 received, 35% packet loss, time 229334ms + - With patch: + 144 packets transmitted, 144 received, 0% packet loss, time 146378ms + +Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> +--- + drivers/net/phy/Kconfig | 10 ++++++++++ + drivers/net/phy/at803x.c | 22 ++++++++++++++++++++++ + 2 files changed, 32 insertions(+) + +--- a/drivers/net/phy/Kconfig ++++ b/drivers/net/phy/Kconfig +@@ -370,6 +370,16 @@ config AT803X_PHY + ---help--- + Currently supports the AT8030 and AT8035 model + ++config AT803X_PHY_SMART_EEE ++ depends on AT803X_PHY ++ default n ++ tristate "SmartEEE feature for AT803X PHYs" ++ ---help--- ++ Enables the Atheros SmartEEE feature (not IEEE 802.3az). When 2 PHYs ++ which support this feature are connected back-to-back, they may ++ negotiate a low-power sleep mode autonomously, without the Ethernet ++ controller's knowledge. May cause packet loss. ++ + config BCM63XX_PHY + tristate "Broadcom 63xx SOCs internal PHY" + depends on BCM63XX || COMPILE_TEST +--- a/drivers/net/phy/at803x.c ++++ b/drivers/net/phy/at803x.c +@@ -63,6 +63,8 @@ + #define AT803X_DEBUG_REG_5 0x05 + #define AT803X_DEBUG_TX_CLK_DLY_EN BIT(8) + ++#define AT803X_LPI_EN BIT(8) ++ + #define ATH8030_PHY_ID 0x004dd076 + #define ATH8031_PHY_ID 0x004dd074 + #define ATH8032_PHY_ID 0x004dd023 +@@ -257,6 +259,19 @@ static int at803x_probe(struct phy_devic + return 0; + } + ++static void at803x_enable_smart_eee(struct phy_device *phydev, int on) ++{ ++ int value; ++ ++ /* 5.1.11 Smart_eee control3 */ ++ value = phy_read_mmd(phydev, MDIO_MMD_PCS, 0x805D); ++ if (on) ++ value |= AT803X_LPI_EN; ++ else ++ value &= ~AT803X_LPI_EN; ++ phy_write_mmd(phydev, MDIO_MMD_PCS, 0x805D, value); ++} ++ + static int at803x_config_init(struct phy_device *phydev) + { + int ret; +@@ -282,6 +297,13 @@ static int at803x_config_init(struct phy + return ret; + } + ++ ++#ifdef CONFIG_AT803X_PHY_SMART_EEE ++ at803x_enable_smart_eee(phydev, 1); ++#else ++ at803x_enable_smart_eee(phydev, 0); ++#endif ++ + /* The RX and TX delay default is: + * after HW reset: RX delay enabled and TX delay disabled + * after SW reset: RX delay enabled, while TX delay retains the |