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libata-core: Fix the iordy methods 

This alone isn't sufficient to save the universe from prehistoric disks
and controllers but it is a first important step. Split off a separate
function to provide a mode filter when controller iordy is not available.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Alan Cox 2007-03-08 23:22:59 +00:00 committed by Jeff Garzik
parent 04351821b4
commit 432729f0b0
1 changed files with 25 additions and 11 deletions
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34
drivers/ata/libata-core.c
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@ -1382,27 +1382,41 @@ unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
unsigned int ata_pio_need_iordy(const struct ata_device *adev) unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{ {
int pio; /* Controller doesn't support IORDY. Probably a pointless check
int speed = adev->pio_mode - XFER_PIO_0; as the caller should know this */
if (adev->ap->flags & ATA_FLAG_NO_IORDY)
if (speed < 2)
return 0; return 0;
if (speed > 2) /* PIO3 and higher it is mandatory */
if (adev->pio_mode > XFER_PIO_2)
return 1; return 1;
/* We turn it on when possible */
if (ata_id_has_iordy(adev->id))
return 1;
return 0;
}
/**
* ata_pio_mask_no_iordy - Return the non IORDY mask
* @adev: ATA device
*
* Compute the highest mode possible if we are not using iordy. Return
* -1 if no iordy mode is available.
*/
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
/* If we have no drive specific rule, then PIO 2 is non IORDY */ /* If we have no drive specific rule, then PIO 2 is non IORDY */
if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */ if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
pio = adev->id[ATA_ID_EIDE_PIO]; u16 pio = adev->id[ATA_ID_EIDE_PIO];
/* Is the speed faster than the drive allows non IORDY ? */ /* Is the speed faster than the drive allows non IORDY ? */
if (pio) { if (pio) {
/* This is cycle times not frequency - watch the logic! */ /* This is cycle times not frequency - watch the logic! */
if (pio > 240) /* PIO2 is 240nS per cycle */ if (pio > 240) /* PIO2 is 240nS per cycle */
return 1; return 3 << ATA_SHIFT_PIO;
return 0; return 7 << ATA_SHIFT_PIO;
} }
} }
return 0; return 3 << ATA_SHIFT_PIO;
} }
/** /**