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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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