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net: dsa: lan9303: Fix lan9303_detect_phy_setup() for MDIO
Handle that MDIO read with no response return 0xffff. Signed-off-by: Egil Hjelmeland <privat@egil-hjelmeland.no> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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1 changed files with 2 additions and 1 deletions
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@ -427,6 +427,7 @@ static int lan9303_detect_phy_setup(struct lan9303 *chip)
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* Special reg 18 of phy 3 reads as 0x0000, if 'phy_addr_sel_strap' is 0
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* and the IDs are 0-1-2, else it contains something different from
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* 0x0000, which means 'phy_addr_sel_strap' is 1 and the IDs are 1-2-3.
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* 0xffff is returned on MDIO read with no response.
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*/
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reg = lan9303_port_phy_reg_read(chip, 3, MII_LAN911X_SPECIAL_MODES);
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if (reg < 0) {
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@ -434,7 +435,7 @@ static int lan9303_detect_phy_setup(struct lan9303 *chip)
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return reg;
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}
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if (reg != 0)
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if ((reg != 0) && (reg != 0xffff))
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chip->phy_addr_sel_strap = 1;
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else
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chip->phy_addr_sel_strap = 0;
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