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[PATCH] libata: make new reset act identical to ->phy_reset register-wise 

This patch makes std component operations act identical to ->phy_reset
register-wise except for SError clearing on sata_std_hardreset.

Note that if a driver only implements/uses hardreset, it should not
use ata_std_probeinit() to avoid extra sata_phy_resume() and
ata_busy_sleep() compared to ->phy_reset.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Tejun Heo 2006-02-10 23:58:48 +09:00 committed by Jeff Garzik
parent c5014de8a7
commit 3a39746a52
1 changed files with 34 additions and 17 deletions
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51
drivers/scsi/libata-core.c
View File

@ -1924,11 +1924,20 @@ static int sata_phy_resume(struct ata_port *ap)
*
* @ap is about to be probed. Initialize it. This function is
* to be used as standard callback for ata_drive_probe_reset().
*
* NOTE!!! Do not use this function as probeinit if a low level
* driver implements only hardreset. Just pass NULL as probeinit
* in that case. Using this function is probably okay but doing
* so makes reset sequence different from the original
* ->phy_reset implementation and Jeff nervous. :-P
*/
extern void ata_std_probeinit(struct ata_port *ap)
{
if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read)
if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read) {
sata_phy_resume(ap);
if (sata_dev_present(ap))
ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
}
}
/**
@ -1954,20 +1963,17 @@ int ata_std_softreset(struct ata_port *ap, int verbose, unsigned int *classes)
DPRINTK("ENTER\n");
if (ap->ops->scr_read && !sata_dev_present(ap)) {
classes[0] = ATA_DEV_NONE;
goto out;
}
/* determine if device 0/1 are present */
if (ata_devchk(ap, 0))
devmask |= (1 << 0);
if (slave_possible && ata_devchk(ap, 1))
devmask |= (1 << 1);
/* devchk reports device presence without actual device on
* most SATA controllers. Check SStatus and turn devmask off
* if link is offline. Note that we should continue resetting
* even when it seems like there's no device.
*/
if (ap->ops->scr_read && !sata_dev_present(ap))
devmask = 0;
/* select device 0 again */
ap->ops->dev_select(ap, 0);
@ -1989,6 +1995,7 @@ int ata_std_softreset(struct ata_port *ap, int verbose, unsigned int *classes)
if (slave_possible && err != 0x81)
classes[1] = ata_dev_try_classify(ap, 1, &err);
out:
DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
return 0;
}
@ -2047,6 +2054,8 @@ int sata_std_hardreset(struct ata_port *ap, int verbose, unsigned int *class)
return -EIO;
}
ap->ops->dev_select(ap, 0); /* probably unnecessary */
*class = ata_dev_try_classify(ap, 0, NULL);
DPRINTK("EXIT, class=%u\n", *class);
@ -2081,11 +2090,9 @@ void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
if (ap->cbl == ATA_CBL_SATA)
sata_print_link_status(ap);
/* bail out if no device is present */
if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
DPRINTK("EXIT, no device\n");
return;
}
/* re-enable interrupts */
if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
ata_irq_on(ap);
/* is double-select really necessary? */
if (classes[0] != ATA_DEV_NONE)
@ -2093,9 +2100,19 @@ void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
if (classes[1] != ATA_DEV_NONE)
ap->ops->dev_select(ap, 0);
/* re-enable interrupts & set up device control */
if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
ata_irq_on(ap);
/* bail out if no device is present */
if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
DPRINTK("EXIT, no device\n");
return;
}
/* set up device control */
if (ap->ioaddr.ctl_addr) {
if (ap->flags & ATA_FLAG_MMIO)
writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
else
outb(ap->ctl, ap->ioaddr.ctl_addr);
}
DPRINTK("EXIT\n");
}