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    SubjectRe: sata suspend resume ...
    On Fri, 21 Apr 2006, Pavel Machek wrote:
    > Not sure why it needs time. Waiting for disk to spin up?

    I don't know, and can't hear, but doubt it (I can't see why
    it'd need disk spun up just to do an ata_dev_set_xfermode).

    > Will it recover from the timeout?

    No, after that wait for 30 seconds, it degenerates into attempting I/O,
    getting errors, remounting the root readonly, can't get much further.

    > Would sticking ata_set_mode() at the end of timeout routine help?

    Well, moving the ata_set_mode after the ata_start_drive does help:
    then the ata_start_drive times out and fails, but that does not seem
    to matter at all, and the ata_set_mode then succeeds and all is well.
    I guess that amounts to what you meant; but all the same, I won't be
    alone in preferring to wait 2 seconds than 30 seconds!

    But you've made me try a bit harder, and the patch below, waiting for
    ATA_BUSY to clear, copying a line used in several other places there,
    fixes it in a much more satisfactory way than mdelay(2000). (I checked
    how long it in fact was waiting, saw various waits between 0.8s and 1.3s).

    This is a patch I'd not be ashamed to send Jeff Garzik cc linux-ide,
    even if we can't name precisely why it's ATA_BUSY then. But I'll
    give it a day or so of real-life suspend/resuming first - Arkadiusz
    and I both noticed we're more likely to resume successfully after
    a brief suspend, so longer suspends are needed for proper testing.


    --- 2.6.17-rc2/drivers/scsi/libata-core.c 2006-04-19 09:14:11.000000000 +0100
    +++ linux/drivers/scsi/libata-core.c 2006-04-21 20:55:48.000000000 +0100
    @@ -4288,6 +4288,7 @@ int ata_device_resume(struct ata_port *a
    if (ap->flags & ATA_FLAG_SUSPENDED) {
    ap->flags &= ~ATA_FLAG_SUSPENDED;
    + ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
    if (!ata_dev_present(dev))
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