xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

libata: separate out ata_std_prereset() from ata_sff_prereset()

Browse Source 
Separate out generic ATA portion from ata_sff_prereset() into
ata_std_prereset() and implement ata_sff_prereset() using the std
version.  Waiting for device readiness is the only SFF specific part.

ata_base_port_ops now has ata_std_prereset() for its prereset and
ata_sff_port_ops overrides it to ata_sff_prereset().  This change can
affect pdc_adma, ahci, sata_fsl and sata_sil24.  pdc_adma implements
its own prereset using ata_sff_prereset() and the rest has hardreset
and thus are unaffected by this change.

This change reflects real world situation.  There is no generic way to
wait for device readiness for non-SFF controllers and some of them
don't have any mechanism for that.  Non-sff drivers which don't have
hardreset should wrap ata_std_prereset() and wait for device readiness
itself but there's no such driver now and isn't likely to be popular
in the future either.

Signed-off-by: Tejun Heo <htejun@gmail.com>
This commit is contained in:
Tejun Heo
2008-04-07 22:47:18 +09:00
committed by Jeff Garzik
parent 288623a06c
commit 0aa1113d54
3 changed files with 48 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
drivers/ata/libata-sff.c
View File

@@ -47,6 +47,7 @@ const struct ata_port_operations ata_sff_port_ops = {
.freeze = ata_sff_freeze,
.thaw = ata_sff_thaw,
.prereset = ata_sff_prereset,
.softreset = ata_sff_softreset,
.error_handler = ata_sff_error_handler,
.post_internal_cmd = ata_sff_post_internal_cmd,
@@ -1606,6 +1607,48 @@ void ata_sff_thaw(struct ata_port *ap)
ap->ops->sff_irq_on(ap);
}
/**
* ata_sff_prereset - prepare SFF link for reset
* @link: SFF link to be reset
* @deadline: deadline jiffies for the operation
*
* SFF link @link is about to be reset. Initialize it. It first
* calls ata_std_prereset() and wait for !BSY if the port is
* being softreset.
*
* LOCKING:
* Kernel thread context (may sleep)
*
* RETURNS:
* 0 on success, -errno otherwise.
*/
int ata_sff_prereset(struct ata_link *link, unsigned long deadline)
{
struct ata_port *ap = link->ap;
struct ata_eh_context *ehc = &link->eh_context;
int rc;
rc = ata_std_prereset(link, deadline);
if (rc)
return rc;
/* if we're about to do hardreset, nothing more to do */
if (ehc->i.action & ATA_EH_HARDRESET)
return 0;
/* wait for !BSY if we don't know that no device is attached */
if (!ata_link_offline(link)) {
rc = ata_sff_wait_ready(ap, deadline);
if (rc && rc != -ENODEV) {
ata_link_printk(link, KERN_WARNING, "device not ready "
"(errno=%d), forcing hardreset\n", rc);
ehc->i.action |= ATA_EH_HARDRESET;
}
}
return 0;
}
/**
* ata_devchk - PATA device presence detection
* @ap: ATA channel to examine