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sata_fsl: Update RX_WATER_MARK for TRANSCFG

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RX_WATER_MARK sets the number of locations in Rx FIFO that can be used before
the transport layer instructs the link layer to transmit HOLDS. Note that it
can take some time for the HOLDs to get to the other end, and that in the
interim there must be enough room in the FIFO to absorb all data that could
arrive.

Update the new recommended value to 16.

Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Prabhakar Kushwaha 2011-03-07 09:28:10 +05:30 committed by Jeff Garzik
parent 4ac7534a7f
commit 578ca87c9d
1 changed files with 12 additions and 0 deletions
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12
drivers/ata/sata_fsl.c
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@ -185,6 +185,11 @@ enum {
COMMANDSTAT = 0x20,
};
/* TRANSCFG (transport-layer) configuration control */
enum {
TRANSCFG_RX_WATER_MARK = (1 << 4),
};
/* PHY (link-layer) configuration control */
enum {
PHY_BIST_ENABLE = 0x01,
@ -1305,6 +1310,7 @@ static int sata_fsl_probe(struct platform_device *ofdev,
struct sata_fsl_host_priv *host_priv = NULL;
int irq;
struct ata_host *host;
u32 temp;
struct ata_port_info pi = sata_fsl_port_info[0];
const struct ata_port_info *ppi[] = { &pi, NULL };
@ -1319,6 +1325,12 @@ static int sata_fsl_probe(struct platform_device *ofdev,
ssr_base = hcr_base + 0x100;
csr_base = hcr_base + 0x140;
if (!of_device_is_compatible(ofdev->dev.of_node, "fsl,mpc8315-sata")) {
temp = ioread32(csr_base + TRANSCFG);
temp = temp & 0xffffffe0;
iowrite32(temp | TRANSCFG_RX_WATER_MARK, csr_base + TRANSCFG);
}
DPRINTK("@reset i/o = 0x%x\n", ioread32(csr_base + TRANSCFG));
DPRINTK("sizeof(cmd_desc) = %d\n", sizeof(struct command_desc));
DPRINTK("sizeof(#define cmd_desc) = %d\n", SATA_FSL_CMD_DESC_SIZE);