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    SubjectRe: [PATCH v2 -rt] ide: workaround buggy hardware issues with preemptable hardirqs
    On Sat, Jun 28, 2008 at 04:54:36AM +0400, Anton Vorontsov wrote:
    > IDE interrupt handler relies on the fact that, if necessary, hardirqs
    > will re-trigger on ISR exit. The assumption is valid for level sensitive
    > interrupts.
    > But some hardware (namely ULi M5228 in the ULi M1575 "Super South Brige")
    > behaves in a strange way: it asserts interrupts as edge sensitive. And
    > because preemptable IRQ handler disables PIC's interrupt, PIC will likely
    > miss it.
    > This patch fixes following issue:
    > ALI15X3: IDE controller (0x10b9:0x5229 rev 0xc8) at PCI slot 0001:03:1f.0
    > ALI15X3: 100% native mode on irq 18
    > ide0: BM-DMA at 0x1120-0x1127, BIOS settings: hda:PIO, hdb:PIO
    > ide1: BM-DMA at 0x1128-0x112f, BIOS settings: hdc:PIO, hdd:PIO
    > hda: Optiarc DVD RW AD-7190A, ATAPI CD/DVD-ROM drive
    > hda: UDMA/66 mode selected
    > ide0 at 0x1100-0x1107,0x110a on irq 18
    > ide-cd: cmd 0x5a timed out
    > hda: lost interrupt
    > hda: ATAPI 12X DVD-ROM DVD-R-RAM CD-R/RW drive, 2048kB Cache
    > Uniform CD-ROM driver Revision: 3.20
    > ide-cd: cmd 0x3 timed out
    > hda: lost interrupt
    > ide-cd: cmd 0x3 timed out
    > hda: lost interrupt
    > ...
    > It would be great to re-configure the ULi bridge or ULi IDE controller
    > to behave sanely, but no one knows how or if this is possible at all
    > (no available specifications).

    Btw, thanks to Jeff Garzik for mentioning this link:

    Though, from a brief glance there is nothing much useful for this ULi
    chip. The only thing I gathered is that IDE controller does not provide
    any means of configuring its IRQs behaviour, so it is indeed ULi's bridge
    problems. It doesn't change anything, just another data point...

    Anton Vorontsov

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