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net: dsa: microchip: ksz8795: add error handling to ksz8_r/w_phy

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Now ksz_pread/ksz_pwrite can return error value. So, make use of it.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Oleksij Rempel 2022-08-26 12:56:24 +02:00 committed by David S. Miller
parent 9da975e1bb
commit 9590fc4a2a
1 changed files with 81 additions and 21 deletions
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102
drivers/net/dsa/microchip/ksz8795.c
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@ -560,14 +560,24 @@ int ksz8_r_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 *val)
u8 val1, val2;
u16 data = 0;
u8 p = phy;
int ret;
regs = dev->info->regs;
switch (reg) {
case MII_BMCR:
ksz_pread8(dev, p, regs[P_NEG_RESTART_CTRL], &restart);
ksz_pread8(dev, p, regs[P_SPEED_STATUS], &speed);
ksz_pread8(dev, p, regs[P_FORCE_CTRL], &ctrl);
ret = ksz_pread8(dev, p, regs[P_NEG_RESTART_CTRL], &restart);
if (ret)
return ret;
ret = ksz_pread8(dev, p, regs[P_SPEED_STATUS], &speed);
if (ret)
return ret;
ret = ksz_pread8(dev, p, regs[P_FORCE_CTRL], &ctrl);
if (ret)
return ret;
if (restart & PORT_PHY_LOOPBACK)
data |= BMCR_LOOPBACK;
if (ctrl & PORT_FORCE_100_MBIT)
@ -597,7 +607,10 @@ int ksz8_r_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 *val)
data |= KSZ886X_BMCR_DISABLE_LED;
break;
case MII_BMSR:
ksz_pread8(dev, p, regs[P_LINK_STATUS], &link);
ret = ksz_pread8(dev, p, regs[P_LINK_STATUS], &link);
if (ret)
return ret;
data = BMSR_100FULL |
BMSR_100HALF |
BMSR_10FULL |
@ -618,7 +631,10 @@ int ksz8_r_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 *val)
data = KSZ8795_ID_LO;
break;
case MII_ADVERTISE:
ksz_pread8(dev, p, regs[P_LOCAL_CTRL], &ctrl);
ret = ksz_pread8(dev, p, regs[P_LOCAL_CTRL], &ctrl);
if (ret)
return ret;
data = ADVERTISE_CSMA;
if (ctrl & PORT_AUTO_NEG_SYM_PAUSE)
data |= ADVERTISE_PAUSE_CAP;
@ -632,7 +648,10 @@ int ksz8_r_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 *val)
data |= ADVERTISE_10HALF;
break;
case MII_LPA:
ksz_pread8(dev, p, regs[P_REMOTE_STATUS], &link);
ret = ksz_pread8(dev, p, regs[P_REMOTE_STATUS], &link);
if (ret)
return ret;
data = LPA_SLCT;
if (link & PORT_REMOTE_SYM_PAUSE)
data |= LPA_PAUSE_CAP;
@ -648,8 +667,14 @@ int ksz8_r_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 *val)
data |= LPA_LPACK;
break;
case PHY_REG_LINK_MD:
ksz_pread8(dev, p, REG_PORT_LINK_MD_CTRL, &val1);
ksz_pread8(dev, p, REG_PORT_LINK_MD_RESULT, &val2);
ret = ksz_pread8(dev, p, REG_PORT_LINK_MD_CTRL, &val1);
if (ret)
return ret;
ret = ksz_pread8(dev, p, REG_PORT_LINK_MD_RESULT, &val2);
if (ret)
return ret;
if (val1 & PORT_START_CABLE_DIAG)
data |= PHY_START_CABLE_DIAG;
@ -664,7 +689,10 @@ int ksz8_r_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 *val)
FIELD_GET(PORT_CABLE_FAULT_COUNTER_L, val2));
break;
case PHY_REG_PHY_CTRL:
ksz_pread8(dev, p, regs[P_LINK_STATUS], &link);
ret = ksz_pread8(dev, p, regs[P_LINK_STATUS], &link);
if (ret)
return ret;
if (link & PORT_MDIX_STATUS)
data |= KSZ886X_CTRL_MDIX_STAT;
break;
@ -683,6 +711,7 @@ int ksz8_w_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 val)
u8 restart, speed, ctrl, data;
const u16 *regs;
u8 p = phy;
int ret;
regs = dev->info->regs;
@ -692,15 +721,26 @@ int ksz8_w_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 val)
/* Do not support PHY reset function. */
if (val & BMCR_RESET)
break;
ksz_pread8(dev, p, regs[P_SPEED_STATUS], &speed);
ret = ksz_pread8(dev, p, regs[P_SPEED_STATUS], &speed);
if (ret)
return ret;
data = speed;
if (val & KSZ886X_BMCR_HP_MDIX)
data |= PORT_HP_MDIX;
else
data &= ~PORT_HP_MDIX;
if (data != speed)
ksz_pwrite8(dev, p, regs[P_SPEED_STATUS], data);
ksz_pread8(dev, p, regs[P_FORCE_CTRL], &ctrl);
if (data != speed) {
ret = ksz_pwrite8(dev, p, regs[P_SPEED_STATUS], data);
if (ret)
return ret;
}
ret = ksz_pread8(dev, p, regs[P_FORCE_CTRL], &ctrl);
if (ret)
return ret;
data = ctrl;
if (ksz_is_ksz88x3(dev)) {
if ((val & BMCR_ANENABLE))
@ -726,9 +766,17 @@ int ksz8_w_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 val)
data |= PORT_FORCE_FULL_DUPLEX;
else
data &= ~PORT_FORCE_FULL_DUPLEX;
if (data != ctrl)
ksz_pwrite8(dev, p, regs[P_FORCE_CTRL], data);
ksz_pread8(dev, p, regs[P_NEG_RESTART_CTRL], &restart);
if (data != ctrl) {
ret = ksz_pwrite8(dev, p, regs[P_FORCE_CTRL], data);
if (ret)
return ret;
}
ret = ksz_pread8(dev, p, regs[P_NEG_RESTART_CTRL], &restart);
if (ret)
return ret;
data = restart;
if (val & KSZ886X_BMCR_DISABLE_LED)
data |= PORT_LED_OFF;
@ -758,11 +806,19 @@ int ksz8_w_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 val)
data |= PORT_PHY_LOOPBACK;
else
data &= ~PORT_PHY_LOOPBACK;
if (data != restart)
ksz_pwrite8(dev, p, regs[P_NEG_RESTART_CTRL], data);
if (data != restart) {
ret = ksz_pwrite8(dev, p, regs[P_NEG_RESTART_CTRL],
data);
if (ret)
return ret;
}
break;
case MII_ADVERTISE:
ksz_pread8(dev, p, regs[P_LOCAL_CTRL], &ctrl);
ret = ksz_pread8(dev, p, regs[P_LOCAL_CTRL], &ctrl);
if (ret)
return ret;
data = ctrl;
data &= ~(PORT_AUTO_NEG_SYM_PAUSE |
PORT_AUTO_NEG_100BTX_FD |
@ -779,8 +835,12 @@ int ksz8_w_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 val)
data |= PORT_AUTO_NEG_10BT_FD;
if (val & ADVERTISE_10HALF)
data |= PORT_AUTO_NEG_10BT;
if (data != ctrl)
ksz_pwrite8(dev, p, regs[P_LOCAL_CTRL], data);
if (data != ctrl) {
ret = ksz_pwrite8(dev, p, regs[P_LOCAL_CTRL], data);
if (ret)
return ret;
}
break;
case PHY_REG_LINK_MD:
if (val & PHY_START_CABLE_DIAG)