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    SubjectRe: 2.6.20-rc6 libata PATA ATAPI CDROM is not working
    Please test the attached patch over 2.6.20.

    Thanks.

    --
    tejun
    diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
    index 667acd2..d6fcf0a 100644
    --- a/drivers/ata/libata-core.c
    +++ b/drivers/ata/libata-core.c
    @@ -1478,7 +1478,16 @@ int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
    }

    tf.protocol = ATA_PROT_PIO;
    - tf.flags |= ATA_TFLAG_POLLING; /* for polling presence detection */
    +
    + /* Some devices choke if TF registers contain garbage. Make
    + * sure those are properly initialized.
    + */
    + tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
    +
    + /* Device presence detection is unreliable on some
    + * controllers. Always poll IDENTIFY if available.
    + */
    + tf.flags |= ATA_TFLAG_POLLING;

    err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
    id, sizeof(id[0]) * ATA_ID_WORDS);
    \
     
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      Last update: 2007-02-12 07:49    [W:0.038 / U:30.076 seconds]
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