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    SubjectRe: Regression 3.2 -> 3.3-rc1 10 sec hang at boot and resume, COMRESET failed
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    On Fri, 2012-02-03 at 14:43 +0900, Norbert Preining wrote:
    > On Fr, 03 Feb 2012, Lin Ming wrote:
    > > > I didn't try to revert that commit on top of HEAD.
    > >
    > > Please revert that commit to test.
    > > That helps us to make sure we find the exact bad commit.
    >
    > Confirmed. Reverted 7faa33da9b7 on top of 6c073a7ee250 made
    > the boot delay go away. dmesg from this boot attached.

    Dig into the code, but I can't find where the problem is.

    Anyway, does below DEBUG patch help?
    Let's always stop the engine during hard reset.

    diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
    index a72bfd0..8fef702 100644
    --- a/drivers/ata/libahci.c
    +++ b/drivers/ata/libahci.c
    @@ -578,10 +578,6 @@ int ahci_stop_engine(struct ata_port *ap)

    tmp = readl(port_mmio + PORT_CMD);

    - /* check if the HBA is idle */
    - if ((tmp & (PORT_CMD_START | PORT_CMD_LIST_ON)) == 0)
    - return 0;
    -
    /* setting HBA to idle */
    tmp &= ~PORT_CMD_START;
    writel(tmp, port_mmio + PORT_CMD);

    >
    > Best wishes
    >
    > Norbert
    > ------------------------------------------------------------------------
    > Norbert Preining preining@{jaist.ac.jp, logic.at, debian.org}
    > JAIST, Japan TeX Live & Debian Developer
    > DSA: 0x09C5B094 fp: 14DF 2E6C 0307 BE6D AD76 A9C0 D2BF 4AA3 09C5 B094
    > ------------------------------------------------------------------------
    > PELUTHO (n.) A South American ball game. The balls are whacked against
    > a brick wall with a stout wooden bat until the prisoner confesses.
    > --- Douglas Adams, The Meaning of Liff




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