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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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1dbba4cb8d
This is a copy and paste buglet. We meant to test for ->write_mmd but
we test for ->read_mmd.
Fixes: 1ee6b9bc62 ("net: phy: make phy_(read|write)_mmd() generic MMD accessors")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
101 lines
2.8 KiB
C
101 lines
2.8 KiB
C
/*
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* Core PHY library, taken from phy.c
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/export.h>
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#include <linux/phy.h>
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static void mmd_phy_indirect(struct mii_bus *bus, int phy_addr, int devad,
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u16 regnum)
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{
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/* Write the desired MMD Devad */
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bus->write(bus, phy_addr, MII_MMD_CTRL, devad);
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/* Write the desired MMD register address */
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bus->write(bus, phy_addr, MII_MMD_DATA, regnum);
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/* Select the Function : DATA with no post increment */
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bus->write(bus, phy_addr, MII_MMD_CTRL, devad | MII_MMD_CTRL_NOINCR);
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}
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/**
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* phy_read_mmd - Convenience function for reading a register
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* from an MMD on a given PHY.
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* @phydev: The phy_device struct
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* @devad: The MMD to read from (0..31)
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* @regnum: The register on the MMD to read (0..65535)
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*
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* Same rules as for phy_read();
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*/
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int phy_read_mmd(struct phy_device *phydev, int devad, u32 regnum)
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{
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int val;
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if (regnum > (u16)~0 || devad > 32)
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return -EINVAL;
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if (phydev->drv->read_mmd) {
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val = phydev->drv->read_mmd(phydev, devad, regnum);
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} else if (phydev->is_c45) {
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u32 addr = MII_ADDR_C45 | (devad << 16) | (regnum & 0xffff);
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val = mdiobus_read(phydev->mdio.bus, phydev->mdio.addr, addr);
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} else {
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struct mii_bus *bus = phydev->mdio.bus;
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int phy_addr = phydev->mdio.addr;
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mutex_lock(&bus->mdio_lock);
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mmd_phy_indirect(bus, phy_addr, devad, regnum);
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/* Read the content of the MMD's selected register */
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val = bus->read(bus, phy_addr, MII_MMD_DATA);
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mutex_unlock(&bus->mdio_lock);
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}
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return val;
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}
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EXPORT_SYMBOL(phy_read_mmd);
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/**
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* phy_write_mmd - Convenience function for writing a register
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* on an MMD on a given PHY.
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* @phydev: The phy_device struct
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* @devad: The MMD to read from
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* @regnum: The register on the MMD to read
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* @val: value to write to @regnum
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*
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* Same rules as for phy_write();
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*/
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int phy_write_mmd(struct phy_device *phydev, int devad, u32 regnum, u16 val)
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{
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int ret;
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if (regnum > (u16)~0 || devad > 32)
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return -EINVAL;
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if (phydev->drv->write_mmd) {
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ret = phydev->drv->write_mmd(phydev, devad, regnum, val);
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} else if (phydev->is_c45) {
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u32 addr = MII_ADDR_C45 | (devad << 16) | (regnum & 0xffff);
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ret = mdiobus_write(phydev->mdio.bus, phydev->mdio.addr,
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addr, val);
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} else {
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struct mii_bus *bus = phydev->mdio.bus;
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int phy_addr = phydev->mdio.addr;
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mutex_lock(&bus->mdio_lock);
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mmd_phy_indirect(bus, phy_addr, devad, regnum);
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/* Write the data into MMD's selected register */
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bus->write(bus, phy_addr, MII_MMD_DATA, val);
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mutex_unlock(&bus->mdio_lock);
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ret = 0;
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}
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return ret;
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}
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EXPORT_SYMBOL(phy_write_mmd);
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