net: freescale: ucc_geth: Hardcode the preamble length to 7 bytes

The preamble length can be configured in ucc_geth, however it just
ends-up always being configured to 7 bytes, as nothing ever changes the
default value of 7.

Make that value the default value when the MACCFG2 register gets
initialized, and remove the code to configure that value altogether.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/ucc_geth.c

@@ -132,7 +132,6 @@ static const struct ucc_geth_info ugeth_primary_info = {
 	.transmitFlowControl = 1,
 	.maxGroupAddrInHash = 4,
 	.maxIndAddrInHash = 4,
-	.prel = 7,
 	.maxFrameLength = 1518+16, /* Add extra bytes for VLANs etc. */
 	.minFrameLength = 64,
 	.maxD1Length = 1520+16, /* Add extra bytes for VLANs etc. */
@@ -1205,18 +1204,6 @@ static int init_mac_station_addr_regs(u8 address_byte_0,
 	return 0;
 }
 
-static int init_preamble_length(u8 preamble_length,
-				u32 __iomem *maccfg2_register)
-{
-	if ((preamble_length < 3) || (preamble_length > 7))
-		return -EINVAL;
-
-	clrsetbits_be32(maccfg2_register, MACCFG2_PREL_MASK,
-			preamble_length << MACCFG2_PREL_SHIFT);
-
-	return 0;
-}
-
 static int init_rx_parameters(int reject_broadcast,
 			      int receive_short_frames,
 			      int promiscuous, u32 __iomem *upsmr_register)
@@ -1276,7 +1263,6 @@ static int adjust_enet_interface(struct ucc_geth_private *ugeth)
 	struct ucc_geth_info *ug_info;
 	struct ucc_geth __iomem *ug_regs;
 	struct ucc_fast __iomem *uf_regs;
-	int ret_val;
 	u32 upsmr, maccfg2;
 	u16 value;
 
@@ -1352,13 +1338,6 @@ static int adjust_enet_interface(struct ucc_geth_private *ugeth)
 		put_device(&tbiphy->mdio.dev);
 	}
 
-	ret_val = init_preamble_length(ug_info->prel, &ug_regs->maccfg2);
-	if (ret_val != 0) {
-		if (netif_msg_probe(ugeth))
-			pr_err("Preamble length must be between 3 and 7 inclusive\n");
-		return ret_val;
-	}
-
 	return 0;
 }
 

drivers/net/ethernet/freescale/ucc_geth.h

@@ -921,7 +921,8 @@ struct ucc_geth_hardware_statistics {
 #define UCC_GETH_UPSMR_INIT                     UCC_GETH_UPSMR_RES1
 
 #define UCC_GETH_MACCFG1_INIT                   0
-#define UCC_GETH_MACCFG2_INIT                   (MACCFG2_RESERVED_1)
+#define UCC_GETH_MACCFG2_INIT                   (MACCFG2_RESERVED_1 | \
+						 (7 << MACCFG2_PREL_SHIFT))
 
 /* Ethernet Address Type. */
 enum enet_addr_type {
@@ -1113,7 +1114,6 @@ struct ucc_geth_info {
 	int transmitFlowControl;
 	u8 maxGroupAddrInHash;
 	u8 maxIndAddrInHash;
-	u8 prel;
 	u16 maxFrameLength;
 	u16 minFrameLength;
 	u16 maxD1Length;