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libata: Add special ata_pio_need_iordy() handling for Compact Flash.

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According to the Compact Flash specification r4.1, PIO modes 5 and 6
do not use iordy.

Signed-off-by: David Daney <[email protected]>
Signed-off-by: Jeff Garzik <[email protected]>
This commit is contained in:
David Daney 2008-12-10 15:39:12 -08:00 • committed by Jeff Garzik
commit 5c18c4d28b
1 changed files with 4 additions and 0 deletions
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4
drivers/ata/libata-core.c
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@ -2001,6 +2001,10 @@ unsigned int ata_pio_need_iordy(const struct ata_device *adev)
as the caller should know this */
if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
return 0;
/* CF spec. r4.1 Table 22 says no iordy on PIO5 and PIO6. */
if (ata_id_is_cfa(adev->id)
&& (adev->pio_mode == XFER_PIO_5 || adev->pio_mode == XFER_PIO_6))
return 0;
/* PIO3 and higher it is mandatory */
if (adev->pio_mode > XFER_PIO_2)
return 1;