net: ks8851-ml: Fix 16-bit IO operation

The Micrel KSZ8851-16MLLI datasheet DS00002357B page 12 states that
BE[3:0] signals are active high. This contradicts the measurements
of the behavior of the actual chip, where these signals behave as
active low. For example, to read the CIDER register, the bus must
expose 0xc0c0 during the address phase, which means BE[3:0]=4'b1100.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Petr Stetiar <ynezz@true.cz>
Cc: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/micrel/ks8851_mll.c b/drivers/net/ethernet/micrel/ks8851_mll.c
index 5ae206ae5d2b34fbd71db62262dd396cdc3af784..1c9e70c8cc30ffbd5700a7278aebd53f00152fe2 100644 (file)
--- a/drivers/net/ethernet/micrel/ks8851_mll.c
+++ b/drivers/net/ethernet/micrel/ks8851_mll.c
@@ -166,7 +166,7 @@ static int msg_enable;
 
 static u16 ks_rdreg16(struct ks_net *ks, int offset)
 {
-       ks->cmd_reg_cache = (u16)offset | ((BE1 | BE0) << (offset & 0x02));
+       ks->cmd_reg_cache = (u16)offset | ((BE3 | BE2) >> (offset & 0x02));
        iowrite16(ks->cmd_reg_cache, ks->hw_addr_cmd);
        return ioread16(ks->hw_addr);
 }
@@ -181,7 +181,7 @@ static u16 ks_rdreg16(struct ks_net *ks, int offset)
 
 static void ks_wrreg16(struct ks_net *ks, int offset, u16 value)
 {
-       ks->cmd_reg_cache = (u16)offset | ((BE1 | BE0) << (offset & 0x02));
+       ks->cmd_reg_cache = (u16)offset | ((BE3 | BE2) >> (offset & 0x02));
        iowrite16(ks->cmd_reg_cache, ks->hw_addr_cmd);
        iowrite16(value, ks->hw_addr);
 }