diff options
| -rw-r--r-- | drivers/net/dsa/microchip/ksz9477.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c index fc5157a10af5..83b7f2d5c1ea 100644 --- a/drivers/net/dsa/microchip/ksz9477.c +++ b/drivers/net/dsa/microchip/ksz9477.c @@ -329,11 +329,27 @@ int ksz9477_r_phy(struct ksz_device *dev, u16 addr, u16 reg, u16 *data) int ksz9477_w_phy(struct ksz_device *dev, u16 addr, u16 reg, u16 val) { + u32 mask, val32; + /* No real PHY after this. */ if (!dev->info->internal_phy[addr]) return 0; - return ksz_pwrite16(dev, addr, 0x100 + (reg << 1), val); + if (reg < 0x10) + return ksz_pwrite16(dev, addr, 0x100 + (reg << 1), val); + + /* Errata: When using SPI, I2C, or in-band register access, + * writes to certain PHY registers should be performed as + * 32-bit writes instead of 16-bit writes. + */ + val32 = val; + mask = 0xffff; + if ((reg & 1) == 0) { + val32 <<= 16; + mask <<= 16; + } + reg &= ~1; + return ksz_prmw32(dev, addr, 0x100 + (reg << 1), mask, val32); } void ksz9477_cfg_port_member(struct ksz_device *dev, int port, u8 member) |