From b188ce30cc1bc89381476977509ebffabfb16323 Mon Sep 17 00:00:00 2001 From: Jerome Brunet Date: Wed, 3 Jan 2018 16:46:29 +0100 Subject: [PATCH] net: stmmac: enable EEE in MII, GMII or RGMII only [ Upstream commit 879626e3a52630316d817cbda7cec9a5446d1d82 ] Note in the databook - Section 4.4 - EEE : " The EEE feature is not supported when the MAC is configured to use the TBI, RTBI, SMII, RMII or SGMII single PHY interface. Even if the MAC supports multiple PHY interfaces, you should activate the EEE mode only when the MAC is operating with GMII, MII, or RGMII interface." Applying this restriction solves a stability issue observed on Amlogic gxl platforms operating with RMII interface and the internal PHY. Fixes: 83bf79b6bb64 ("stmmac: disable at run-time the EEE if not supported") Signed-off-by: Jerome Brunet Tested-by: Arnaud Patard Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 6 ++++++ include/linux/phy.h | 11 +++++++++++ 2 files changed, 17 insertions(+) diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index 4b100ef4af9fc..5adaf537513ba 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -272,8 +272,14 @@ bool stmmac_eee_init(struct stmmac_priv *priv) { char *phy_bus_name = priv->plat->phy_bus_name; unsigned long flags; + int interface = priv->plat->interface; bool ret = false; + if ((interface != PHY_INTERFACE_MODE_MII) && + (interface != PHY_INTERFACE_MODE_GMII) && + !phy_interface_mode_is_rgmii(interface)) + goto out; + /* Using PCS we cannot dial with the phy registers at this stage * so we do not support extra feature like EEE. */ diff --git a/include/linux/phy.h b/include/linux/phy.h index 5bc4b9d563a9f..dbfd5ce9350f5 100644 --- a/include/linux/phy.h +++ b/include/linux/phy.h @@ -682,6 +682,17 @@ static inline bool phy_is_internal(struct phy_device *phydev) return phydev->is_internal; } +/** + * phy_interface_mode_is_rgmii - Convenience function for testing if a + * PHY interface mode is RGMII (all variants) + * @mode: the phy_interface_t enum + */ +static inline bool phy_interface_mode_is_rgmii(phy_interface_t mode) +{ + return mode >= PHY_INTERFACE_MODE_RGMII && + mode <= PHY_INTERFACE_MODE_RGMII_TXID; +}; + /** * phy_interface_is_rgmii - Convenience function for testing if a PHY interface * is RGMII (all variants) -- 2.47.3