ahci: use deadline instead of fixed timeout for 1st FIS for SRST
Use deadline instead of fixed timeout for 1st FIS for SRST to improve
robustness of SRST.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 61c5b6e..0451600 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -976,6 +976,7 @@
void __iomem *port_mmio = ahci_port_base(ap);
const u32 cmd_fis_len = 5; /* five dwords */
const char *reason = NULL;
+ unsigned long now, msecs;
struct ata_taskfile tf;
u32 tmp;
u8 *fis;
@@ -1016,6 +1017,11 @@
fis = pp->cmd_tbl;
/* issue the first D2H Register FIS */
+ msecs = 0;
+ now = jiffies;
+ if (time_after(now, deadline))
+ msecs = jiffies_to_msecs(deadline - now);
+
ahci_fill_cmd_slot(pp, 0,
cmd_fis_len | AHCI_CMD_RESET | AHCI_CMD_CLR_BUSY);
@@ -1024,7 +1030,7 @@
writel(1, port_mmio + PORT_CMD_ISSUE);
- tmp = ata_wait_register(port_mmio + PORT_CMD_ISSUE, 0x1, 0x1, 1, 500);
+ tmp = ata_wait_register(port_mmio + PORT_CMD_ISSUE, 0x1, 0x1, 1, msecs);
if (tmp & 0x1) {
rc = -EIO;
reason = "1st FIS failed";