Commit e3a6dadc authored Dec 16, 2015 by Tang Yuantian Committed by Tejun Heo Dec 16, 2015

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: Tang Yuantian <Yuantian.Tang@freescale.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

parent ef0cc7fe

drivers/ata/ahci_qoriq.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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;
		}

Admin message