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[PATCH] libata: implement ata_down_xfermask_limit()
Implement ata_down_xfermask_limit(). This function manipulates @dev->pio/mwdma/udma_mask such that the next lower transfer mode is selected. This will be used to improve ata_bus_probe() failure handling and later by EH. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
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@ -65,6 +65,8 @@ static unsigned int ata_dev_init_params(struct ata_port *ap,
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struct ata_device *dev,
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u16 heads,
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u16 sectors);
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static int ata_down_xfermask_limit(struct ata_port *ap, struct ata_device *dev,
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int force_pio0);
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static int ata_down_sata_spd_limit(struct ata_port *ap);
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static int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev);
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static unsigned int ata_dev_set_xfermode(struct ata_port *ap,
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@ -1859,6 +1861,56 @@ int ata_timing_compute(struct ata_device *adev, unsigned short speed,
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return 0;
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}
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/**
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* ata_down_xfermask_limit - adjust dev xfer masks downward
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* @ap: Port associated with device @dev
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* @dev: Device to adjust xfer masks
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* @force_pio0: Force PIO0
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*
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* Adjust xfer masks of @dev downward. Note that this function
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* does not apply the change. Invoking ata_set_mode() afterwards
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* will apply the limit.
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*
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* LOCKING:
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* Inherited from caller.
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*
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* RETURNS:
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* 0 on success, negative errno on failure
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*/
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static int ata_down_xfermask_limit(struct ata_port *ap, struct ata_device *dev,
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int force_pio0)
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{
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unsigned long xfer_mask;
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int highbit;
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xfer_mask = ata_pack_xfermask(dev->pio_mask, dev->mwdma_mask,
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dev->udma_mask);
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if (!xfer_mask)
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goto fail;
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/* don't gear down to MWDMA from UDMA, go directly to PIO */
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if (xfer_mask & ATA_MASK_UDMA)
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xfer_mask &= ~ATA_MASK_MWDMA;
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highbit = fls(xfer_mask) - 1;
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xfer_mask &= ~(1 << highbit);
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if (force_pio0)
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xfer_mask &= 1 << ATA_SHIFT_PIO;
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if (!xfer_mask)
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goto fail;
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ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
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&dev->udma_mask);
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printk(KERN_WARNING "ata%u: dev %u limiting speed to %s\n",
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ap->id, dev->devno, ata_mode_string(xfer_mask));
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return 0;
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fail:
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return -EINVAL;
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}
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static int ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
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{
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unsigned int err_mask;
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