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authorPrabhakar Kushwaha <prabhakar@freescale.com>2011-03-07 06:58:10 +0300
committerJeff Garzik <jgarzik@pobox.com>2011-03-14 10:05:48 +0300
commit578ca87c9d18d344b449a8eefee40c10e4fc319f (patch)
tree87222242fd3ee975a18a7d2d1b555d5a078ed1cb /drivers/ata
parent4ac7534a7ff1aa1b1486e39bdf169aaa8a9bb3e2 (diff)
downloadlinux-578ca87c9d18d344b449a8eefee40c10e4fc319f.tar.xz
sata_fsl: Update RX_WATER_MARK for TRANSCFG
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>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/sata_fsl.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/ata/sata_fsl.c b/drivers/ata/sata_fsl.c
index 2ddb567f165b..7f9eab34a386 100644
--- a/drivers/ata/sata_fsl.c
+++ b/drivers/ata/sata_fsl.c
@@ -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);