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