Bartlomiej Zolnierkiewicz wrote:
On Saturday 13 June 2009 22:49:26 Sergei Shtylyov wrote:
Hello.
Bartlomiej Zolnierkiewicz wrote:
Cc: Jeff Garzik <jgarzik@xxxxxxxxx>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>
---
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)
It actually makes sense to put the cheap 'pio' check first. We
shouldn't call ata_id_is_cfa() for all modes.
It is a micro-optimization but why not... revised version follows.
From: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>
Subject: [PATCH] ata: add ata_id_pio_need_iordy() helper (v2)
v2:
Minor fixes per Sergei's review.
Cc: Sergei Shtylyov <sshtylyov@xxxxxxxxxxxxx>
Cc: Jeff Garzik <jgarzik@xxxxxxxxx>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>
---
against Linus' tree
include/linux/ata.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)
Index: b/include/linux/ata.h
===================================================================
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -800,6 +800,20 @@ 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 (pio > 4 && ata_id_is_cfa(id))
+ return 0;
+ /* For PIO3 and higher it is mandatory. */
+ if (pio > 2)
+ return 1;
+ /* Turn it on when possible. */
+ if (ata_id_has_iordy(id))
+ return 1;
+ return 0;
ACK
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