From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:50444 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389044AbeGTN2u (ORCPT ); Fri, 20 Jul 2018 09:28:50 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Bhadram Varka , "David S. Miller" Subject: [PATCH 4.17 040/101] stmmac: fix DMA channel hang in half-duplex mode Date: Fri, 20 Jul 2018 14:13:46 +0200 Message-Id: <20180720121424.692142183@linuxfoundation.org> In-Reply-To: <20180720121422.837870592@linuxfoundation.org> References: <20180720121422.837870592@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.17-stable review patch. If anyone has any objections, please let me know. ------------------ From: Bhadram Varka [ Upstream commit b6cfffa7ad923c73f317ea50fd4ebcb3b4b6669c ] HW does not support Half-duplex mode in multi-queue scenario. Fix it by not advertising the Half-Duplex mode if multi-queue enabled. Signed-off-by: Bhadram Varka Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 10 ++++++++++ 1 file changed, 10 insertions(+) --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -927,6 +927,7 @@ static void stmmac_check_pcs_mode(struct static int stmmac_init_phy(struct net_device *dev) { struct stmmac_priv *priv = netdev_priv(dev); + u32 tx_cnt = priv->plat->tx_queues_to_use; struct phy_device *phydev; char phy_id_fmt[MII_BUS_ID_SIZE + 3]; char bus_id[MII_BUS_ID_SIZE]; @@ -968,6 +969,15 @@ static int stmmac_init_phy(struct net_de SUPPORTED_1000baseT_Full); /* + * Half-duplex mode not supported with multiqueue + * half-duplex can only works with single queue + */ + if (tx_cnt > 1) + phydev->supported &= ~(SUPPORTED_1000baseT_Half | + SUPPORTED_100baseT_Half | + SUPPORTED_10baseT_Half); + + /* * Broken HW is sometimes missing the pull-up resistor on the * MDIO line, which results in reads to non-existent devices returning * 0 rather than 0xffff. Catch this here and treat 0 as a non-existent