From: Egil Hjelmeland Date: Sun, 30 Jul 2017 17:58:53 +0000 (+0200) Subject: net: dsa: lan9303: Fix lan9303_detect_phy_setup() for MDIO X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d329ac88eb217fef1516a1dcfda27b7f5a8eb07b;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git net: dsa: lan9303: Fix lan9303_detect_phy_setup() for MDIO Handle that MDIO read with no response return 0xffff. Signed-off-by: Egil Hjelmeland Reviewed-by: Andrew Lunn Reviewed-by: Vivien Didelot Reviewed-by: Florian Fainelli Signed-off-by: David S. Miller --- diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c index cd76e61f1fca..9d0ab77edb4a 100644 --- a/drivers/net/dsa/lan9303-core.c +++ b/drivers/net/dsa/lan9303-core.c @@ -427,6 +427,7 @@ static int lan9303_detect_phy_setup(struct lan9303 *chip) * Special reg 18 of phy 3 reads as 0x0000, if 'phy_addr_sel_strap' is 0 * and the IDs are 0-1-2, else it contains something different from * 0x0000, which means 'phy_addr_sel_strap' is 1 and the IDs are 1-2-3. + * 0xffff is returned on MDIO read with no response. */ reg = lan9303_port_phy_reg_read(chip, 3, MII_LAN911X_SPECIAL_MODES); if (reg < 0) { @@ -434,7 +435,7 @@ static int lan9303_detect_phy_setup(struct lan9303 *chip) return reg; } - if (reg != 0) + if ((reg != 0) && (reg != 0xffff)) chip->phy_addr_sel_strap = 1; else chip->phy_addr_sel_strap = 0;