[PATCH 1/3] ata: add ata_id_pio_need_iordy() helper

[Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>]

Cc: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
---
against Linus' tree

 include/linux/ata.h |   11 +++++++++++
 1 file changed, 11 insertions(+)

Index: b/include/linux/ata.h
===================================================================
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -800,6 +800,17 @@ static inline int ata_id_is_ssd(const u1
 	return id[ATA_ID_ROT_SPEED] == 0x01;
 }
 
+static inline int ata_id_pio_need_iordy(const u16 *id, const u8 pio)
+{
+	/* CF spec. r4.1 Table 22 says no IORDY on PIO5 and PIO6.  */
+	if (ata_id_is_cfa(id) && pio > 4)
+		return 0;
+	/* PIO3 and higher it is mandatory. */
+	if (pio > 2 || ata_id_has_iordy(id))
+		return 1;
+	return 0;
+}
+
 static inline int ata_drive_40wire(const u16 *dev_id)
 {
 	if (ata_id_is_sata(dev_id))