ata: add ata_id_pio_need_iordy() helper (v2)
v2: Minor fixes per Sergei's review. Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Jeff Garzik <jgarzik@pobox.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
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@ -800,6 +800,20 @@ static inline int ata_id_is_ssd(const u16 *id)
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return id[ATA_ID_ROT_SPEED] == 0x01;
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}
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static inline int ata_id_pio_need_iordy(const u16 *id, const u8 pio)
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{
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/* CF spec. r4.1 Table 22 says no IORDY on PIO5 and PIO6. */
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if (pio > 4 && ata_id_is_cfa(id))
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return 0;
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/* For PIO3 and higher it is mandatory. */
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if (pio > 2)
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return 1;
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/* Turn it on when possible. */
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if (ata_id_has_iordy(id))
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return 1;
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return 0;
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}
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static inline int ata_drive_40wire(const u16 *dev_id)
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{
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if (ata_id_is_sata(dev_id))
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