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    SubjectRe: [PATA] Failed to set xfermode on LITE-ON LTR-48246S
    Philipp Matthias Hahn wrote:
    > Hello!
    >
    > As reported by John Williams and others like in
    > http://www.mail-archive.com/linux-ide@vger.kernel.org/msg03088.html
    > I too have a problem with 2.6.20.1 using ata_piix not detecting the
    > CD-ROM any more. Applying the patch from
    > http://lkml.org/lkml/2007/2/12/24 did not help, but additionally
    > applying
    > http://readlist.com/lists/vger.kernel.org/linux-kernel/45/228948.html
    > made it work. Here's the relevant extra debugging output:

    * Did it work with previous kernels?

    * Does applying the attached patch over unpatched 2.6.20.1 fix the problem?

    --
    tejun
    diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
    index dc42ba1..78e6ac5 100644
    --- a/drivers/ata/ata_piix.c
    +++ b/drivers/ata/ata_piix.c
    @@ -105,8 +105,10 @@ enum {
    PIIX_FLAG_AHCI = (1 << 27), /* AHCI possible */
    PIIX_FLAG_CHECKINTR = (1 << 28), /* make sure PCI INTx enabled */

    - PIIX_PATA_FLAGS = ATA_FLAG_SLAVE_POSS,
    - PIIX_SATA_FLAGS = ATA_FLAG_SATA | PIIX_FLAG_CHECKINTR,
    + PIIX_PATA_FLAGS = ATA_FLAG_SLAVE_POSS |
    + ATA_FLAG_SETXFER_POLLING,
    + PIIX_SATA_FLAGS = ATA_FLAG_SATA | PIIX_FLAG_CHECKINTR |
    + ATA_FLAG_SETXFER_POLLING,

    /* combined mode. if set, PATA is channel 0.
    * if clear, PATA is channel 1.
    \
     
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