ahci: qoriq: Update the default Rx watermark value

The PTC[RXWM] sets the watermark value for Rx FIFO. The default
value 0x20 might be insufficient for some hard drives. If the
watermark value is too small, a single-cycle overflow may occur
and is reported as a CRC or internal error in the PxSERR register.
Updated the value to 0x29 according to the validation test.
All LS platforms are affected.
Signed-off-by: NTang Yuantian <Yuantian.Tang@freescale.com>
Signed-off-by: NTejun Heo <tj@kernel.org>

drivers/ata/ahci_qoriq.c

@@ -38,7 +38,7 @@
 #define AHCI_PORT_PHY_3_CFG	0x0e081004
 #define AHCI_PORT_PHY_4_CFG	0x00480811
 #define AHCI_PORT_PHY_5_CFG	0x192c96a4
-#define AHCI_PORT_TRANS_CFG	0x08000025
+#define AHCI_PORT_TRANS_CFG	0x08000029
 #define LS1043A_PORT_PHY2	0x28184d1f
 #define LS1043A_PORT_PHY3	0x0e081509
 
@@ -169,6 +169,7 @@ static int ahci_qoriq_phy_init(struct ahci_host_priv *hpriv)
 
 	case AHCI_LS2080A:
 		writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
+		writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
 		break;
 	}