[PATCH v1 3/4] ata: ahci_imx: Enlarge RX water mark for i.MX8QM SATA

[Richard Zhu]

The RXWM(RxWaterMark) sets the minimum number of free location within
the RX FIFO before the watermark is exceeded which in turn will cause
the Transport Layer to instruct the Link Layer to transmit HOLDS to
the transmitting end.

Based on the default RXWM vaulue 0x20, RX FIFO overflow might be
observed on i.MX8QM MEK board, when some Gen3 SATA disks are used.

The FIFO overflow will result in CRC error, internal error and protocol
error, then the SATA link is not stable anymore.

To fix this issue, enlarge RX water mark setting from 0x20 to 0x29.

Signed-off-by: Richard Zhu <hongxing.zhu@xxxxxxx>
---
 drivers/ata/ahci_imx.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/ata/ahci_imx.c b/drivers/ata/ahci_imx.c
index 0e9fddd02ee5f..9147cd14f587e 100644
--- a/drivers/ata/ahci_imx.c
+++ b/drivers/ata/ahci_imx.c
@@ -45,6 +45,10 @@ enum {
 	/* Clock Reset Register */
 	IMX_CLOCK_RESET				= 0x7f3f,
 	IMX_CLOCK_RESET_RESET			= 1 << 0,
+	/* IMX8QM SATA specific control registers */
+	IMX8QM_SATA_AHCI_VEND_PTC			= 0xc8,
+	IMX8QM_SATA_AHCI_VEND_PTC_RXWM_MASK		= 0x7f,
+	IMX8QM_SATA_AHCI_VEND_PTC_RXWM			= 0x29,
 };
 
 enum ahci_imx_type {
@@ -466,6 +470,12 @@ static int imx8_sata_enable(struct ahci_host_priv *hpriv)
 	phy_power_off(imxpriv->cali_phy0);
 	phy_exit(imxpriv->cali_phy0);
 
+	/* RxWaterMark setting */
+	val = readl(hpriv->mmio + IMX8QM_SATA_AHCI_VEND_PTC);
+	val &= ~IMX8QM_SATA_AHCI_VEND_PTC_RXWM_MASK;
+	val |= IMX8QM_SATA_AHCI_VEND_PTC_RXWM;
+	writel(val, hpriv->mmio + IMX8QM_SATA_AHCI_VEND_PTC);
+
 	return 0;
 
 err_sata_phy_power_on:
-- 
2.37.1