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[PATCH] sata_sil24: update sil24_hardreset()

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Use phy debouncing instead of unconditional wait after DEV_RST and
make sil24_hardreset() to request followup SRST as that's the only way
to wait for !BSY.  Note that the original implementation never worked
- if the cached status was !BSY, ata_busy_sleep() finished
immediately; otherwise, it timed out regardless of the actual device
status.

Signed-off-by: Tejun Heo <htejun@gmail.com>
This commit is contained in:
Tejun Heo 2006-05-31 18:27:59 +09:00
parent 135da34573
commit e8e008e7b5
1 changed files with 14 additions and 12 deletions
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26
drivers/scsi/sata_sil24.c
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@ -591,7 +591,7 @@ static int sil24_hardreset(struct ata_port *ap, unsigned int *class)
{
void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
const char *reason;
int tout_msec;
int tout_msec, rc;
u32 tmp;
/* sil24 does the right thing(tm) without any protection */
@ -605,10 +605,14 @@ static int sil24_hardreset(struct ata_port *ap, unsigned int *class)
tmp = ata_wait_register(port + PORT_CTRL_STAT,
PORT_CS_DEV_RST, PORT_CS_DEV_RST, 10, tout_msec);
/* SStatus oscillates between zero and valid status for short
* duration after DEV_RST, give it time to settle.
/* SStatus oscillates between zero and valid status after
* DEV_RST, debounce it.
*/
msleep(100);
rc = sata_phy_debounce(ap, sata_deb_timing_before_fsrst);
if (rc) {
reason = "PHY debouncing failed";
goto err;
}
if (tmp & PORT_CS_DEV_RST) {
if (ata_port_offline(ap))
@ -617,15 +621,13 @@ static int sil24_hardreset(struct ata_port *ap, unsigned int *class)
goto err;
}
if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
reason = "device not ready";
goto err;
}
/* sil24 doesn't report device class code after hardreset,
* leave *class alone.
/* Sil24 doesn't store signature FIS after hardreset, so we
* can't wait for BSY to clear. Some devices take a long time
* to get ready and those devices will choke if we don't wait
* for BSY clearance here. Tell libata to perform follow-up
* softreset.
*/
return 0;
return -EAGAIN;
err:
ata_port_printk(ap, KERN_ERR, "hardreset failed (%s)\n", reason);