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    SubjectRe: [PATCH 62/86] pata_pdc202xx_old: document known issues
    Date
    On Wednesday 25 November 2009 06:50:26 pm Jeff Garzik wrote:
    > On 11/25/2009 12:46 PM, Alan Cox wrote:
    > > On Wed, 25 Nov 2009 18:09:48 +0100
    > > Bartlomiej Zolnierkiewicz<bzolnier@gmail.com> wrote:
    > >
    > >> From: Bartlomiej Zolnierkiewicz<bzolnier@gmail.com>
    > >> Subject: [PATCH] pata_pdc202xx_old: document known issues
    > >>
    > >> Document known issues with the driver to aid distribution makers,
    > >> users and developers in making informed decisions instead of wasting
    > >> their time needlessly.
    > >>
    > >> Signed-off-by: Bartlomiej Zolnierkiewicz<bzolnier@gmail.com>
    > >> ---
    > >> drivers/ata/Kconfig | 4 ++++
    > >> 1 file changed, 4 insertions(+)
    > >>
    > >> Index: b/drivers/ata/Kconfig
    > >> ===================================================================
    > >> --- a/drivers/ata/Kconfig
    > >> +++ b/drivers/ata/Kconfig
    > >> @@ -583,6 +583,10 @@ config PATA_PDC_OLD
    > >> This option enables support for the Promise 20246, 20262, 20263,
    > >> 20265 and 20267 adapters.
    > >>
    > >> + Known issues:
    > >> + - UDMA transfers fail mysteriously on some chipsets
    > >> + - ATAPI DMA is unsupported currently
    > >
    > > Not sure this is useful, because the reports of UDMA failures are lower
    > > than most other reports. Should IPV6 have "known issues, mysterious timer
    > > list corruption" for example which occurs far more. Not do we list 'no
    > > atapi dma' in the help for the IDE SII driver ?
    >
    > If the chip can support ATAPI DMI, but the driver does not, that
    > deserves a comment, even if it's "hardware bugs prevent ATAPI DMA" or
    > "ATAPI DMA would require much more code to support, so we did not bother
    > for now"
    >
    > Ditto for things like useful ideas ("consider PIO-over-DMA in SiI 311x")
    > and other would-be-nice-to-have ideas. These can serve as projects for
    > newbies, or reminders for old-timers.

    The problem is that the old driver supported ATAPI DMA so people may have
    quite different expectations than in case of never-ever-implemented-ideas.

    --
    Bartlomiej Zolnierkiewicz


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