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libata-pmp-prep: implement ATA_LFLAG_NO_SRST, ASSUME_ATA and ASSUME_SEMB

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Some links on some PMPs locks up on SRST and/or report incorrect
device signature.  Implement ATA_LFLAG_NO_SRST, ASSUME_ATA and
ASSUME_SEMB to handle these quirky links.  NO_SRST makes EH avoid
SRST.  ASSUME_ATA and SEMB forces class code to ATA and SEMB_UNSUP
respectively.  Note that SEMB isn't currently supported yet so the
_UNSUP variant is used.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2007-09-23 13:14:12 +09:00 committed by Jeff Garzik
parent da917d69d0
commit ae791c0569
2 changed files with 36 additions and 10 deletions
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42
drivers/ata/libata-eh.c
View File

@ -1906,14 +1906,18 @@ static int ata_do_reset(struct ata_link *link, ata_reset_fn_t reset,
return 0;
}
static int ata_eh_followup_srst_needed(int rc, int classify,
static int ata_eh_followup_srst_needed(struct ata_link *link,
int rc, int classify,
const unsigned int *classes)
{
if (link->flags & ATA_LFLAG_NO_SRST)
return 0;
if (rc == -EAGAIN)
return 1;
if (rc != 0)
return 0;
if (classify && classes[0] == ATA_DEV_UNKNOWN)
if (classify && !(link->flags & ATA_LFLAG_ASSUME_CLASS) &&
classes[0] == ATA_DEV_UNKNOWN)
return 1;
return 0;
}
@ -1940,7 +1944,8 @@ int ata_eh_reset(struct ata_link *link, int classify,
*/
action = ehc->i.action;
ehc->i.action &= ~ATA_EH_RESET_MASK;
if (softreset && (!hardreset || (!sata_set_spd_needed(link) &&
if (softreset && (!hardreset || (!(link->flags & ATA_LFLAG_NO_SRST) &&
!sata_set_spd_needed(link) &&
!(action & ATA_EH_HARDRESET))))
ehc->i.action |= ATA_EH_SOFTRESET;
else
@ -2003,7 +2008,7 @@ int ata_eh_reset(struct ata_link *link, int classify,
rc = ata_do_reset(link, reset, classes, deadline);
if (reset == hardreset &&
ata_eh_followup_srst_needed(rc, classify, classes)) {
ata_eh_followup_srst_needed(link, rc, classify, classes)) {
/* okay, let's do follow-up softreset */
reset = softreset;
@ -2018,8 +2023,8 @@ int ata_eh_reset(struct ata_link *link, int classify,
ata_eh_about_to_do(link, NULL, ATA_EH_RESET_MASK);
rc = ata_do_reset(link, reset, classes, deadline);
if (rc == 0 && classify &&
classes[0] == ATA_DEV_UNKNOWN) {
if (rc == 0 && classify && classes[0] == ATA_DEV_UNKNOWN &&
!(link->flags & ATA_LFLAG_ASSUME_CLASS)) {
ata_link_printk(link, KERN_ERR,
"classification failed\n");
rc = -EINVAL;
@ -2027,6 +2032,10 @@ int ata_eh_reset(struct ata_link *link, int classify,
}
}
/* if we skipped follow-up srst, clear rc */
if (rc == -EAGAIN)
rc = 0;
if (rc && try < ARRAY_SIZE(ata_eh_reset_timeouts)) {
unsigned long now = jiffies;
@ -2051,12 +2060,25 @@ int ata_eh_reset(struct ata_link *link, int classify,
if (rc == 0) {
u32 sstatus;
/* After the reset, the device state is PIO 0 and the
* controller state is undefined. Record the mode.
*/
ata_link_for_each_dev(dev, link)
ata_link_for_each_dev(dev, link) {
/* After the reset, the device state is PIO 0
* and the controller state is undefined.
* Record the mode.
*/
dev->pio_mode = XFER_PIO_0;
if (ata_link_offline(link))
continue;
/* apply class override and convert UNKNOWN to NONE */
if (link->flags & ATA_LFLAG_ASSUME_ATA)
classes[dev->devno] = ATA_DEV_ATA;
else if (link->flags & ATA_LFLAG_ASSUME_SEMB)
classes[dev->devno] = ATA_DEV_SEMB_UNSUP; /* not yet */
else if (classes[dev->devno] == ATA_DEV_UNKNOWN)
classes[dev->devno] = ATA_DEV_NONE;
}
/* record current link speed */
if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0)
link->sata_spd = (sstatus >> 4) & 0xf;

4
include/linux/libata.h
View File

@ -165,6 +165,10 @@ enum {
ATA_LFLAG_HRST_TO_RESUME = (1 << 0), /* hardreset to resume link */
ATA_LFLAG_SKIP_D2H_BSY = (1 << 1), /* can't wait for the first D2H
* Register FIS clearing BSY */
ATA_LFLAG_NO_SRST = (1 << 2), /* avoid softreset */
ATA_LFLAG_ASSUME_ATA = (1 << 3), /* assume ATA class */
ATA_LFLAG_ASSUME_SEMB = (1 << 4), /* assume SEMB class */
ATA_LFLAG_ASSUME_CLASS = ATA_LFLAG_ASSUME_ATA | ATA_LFLAG_ASSUME_SEMB,
/* struct ata_port flags */
ATA_FLAG_SLAVE_POSS = (1 << 0), /* host supports slave dev */