layerscape: add patches-5.4

[openwrt/staging/wigyori.git] / target / linux / layerscape / patches-5.4 / 701-net-0327-at803x-Address-packet-drops-at-low-traffic-rate-due-.patch

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 (file)
index 0000000..f6cf0e0
--- /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