Hello.
Sebastian Andrzej Siewior wrote:
On 03/26/2010 07:04 AM, Sebastian Andrzej Siewior wrote:
Can you please play with ata_sff_freeze() and find out why it's not
working?
I've been there. I've moved the functions around and nothing changed.
After removing the ATA_NIEN bit it started working. So it looks like
->sff_check_status() & ->sff_irq_clear() are not clearing the interrupt
for what reason ever.
What happens if you remove everything else from the function and just
set ATA_NIEN?
removing everything from ata_sff_freeze() makes the interrupt storm go
away.
Leaving
- ap->ctl |= ATA_NIEN;
=> seems to work
- the upper and "ap->last_ctl = ap->ctl;"
=> seems to work
- the upper and "iowrite8(ap->ctl, ioaddr->ctl_addr);"
=> irq storm on request irq.
ata_sff_check_status() does not report ATA_DRQ set so I don't know why
the interrupt is comming.
Perhaps the drive incorrectly triggers interrupt on setting the nIEN
bit -- some drives are known to do this; there is a blacklist of such
drives in the IDE core so that it avoids setting nIEN bit for them.
WBR, Sergei
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