Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753985AbaLHDmi (ORCPT ); Sun, 7 Dec 2014 22:42:38 -0500 Received: from eusmtp01.atmel.com ([212.144.249.243]:50475 "EHLO eusmtp01.atmel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753889AbaLHDmg (ORCPT ); Sun, 7 Dec 2014 22:42:36 -0500 From: Wenyou Yang To: CC: , , , , Subject: [PATCH] net: phy: micrel: workaround to NAND_Tree# incorrectly strapp-in during the reset period. Date: Mon, 8 Dec 2014 11:35:40 +0800 Message-ID: <1418009740-27384-1-git-send-email-wenyou.yang@atmel.com> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Appearance: On some boards, after power up, the Ethernet doesn't work. Reason: On the SAMA5D4EK, the PIOE2 pin is connected to the NAND_Tree# of KSZ8081, But it outputs LOW during the reset period, which cause the NAND_Tree# enabled. Workaround: In the .config_init(), add code to disable NAND_Tree# by operating Operation Mode Strap Override(i.e. Register 16h). Signed-off-by: Wenyou Yang --- drivers/net/phy/micrel.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c index 8c2a29a..11d72cb 100644 --- a/drivers/net/phy/micrel.c +++ b/drivers/net/phy/micrel.c @@ -31,6 +31,7 @@ /* Operation Mode Strap Override */ #define MII_KSZPHY_OMSO 0x16 #define KSZPHY_OMSO_B_CAST_OFF (1 << 9) +#define KSZPHY_OMSO_NAND_TREE_OVERRIDE (1 << 5) #define KSZPHY_OMSO_RMII_OVERRIDE (1 << 1) #define KSZPHY_OMSO_MII_OVERRIDE (1 << 0) @@ -180,7 +181,12 @@ static int kszphy_setup_led(struct phy_device *phydev, static int kszphy_config_init(struct phy_device *phydev) { - return 0; + int rc; + + phy_write(phydev, MII_KSZPHY_OMSO, phy_read(phydev, MII_KSZPHY_OMSO) + & (~KSZPHY_OMSO_NAND_TREE_OVERRIDE)); + rc = ksz_config_flags(phydev); + return rc < 0 ? rc : 0; } static int kszphy_config_init_led8041(struct phy_device *phydev) -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/