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libata: implement ATA_DFLAG_DUBIOUS_XFER

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ATA_DFLAG_DUBIOUS_XFER is set whenever data transfer speed or method
changes and gets cleared when data transfer command succeeds in the
newly configured transfer mode.

This will be used to improve speed down logic.

Signed-off-by: Tejun Heo <htejun@gmail.com<
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2007-11-27 19:28:58 +09:00 • committed by Jeff Garzik
commit 00115e0f5b
3 changed files with 53 additions and 2 deletions
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3
include/linux/libata.h
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@ -143,6 +143,7 @@ enum {
ATA_DFLAG_NCQ_OFF = (1 << 13), /* device limited to non-NCQ mode */
ATA_DFLAG_SPUNDOWN = (1 << 14), /* XXX: for spindown_compat */
ATA_DFLAG_SLEEPING = (1 << 15), /* device is sleeping */
ATA_DFLAG_DUBIOUS_XFER = (1 << 16), /* data transfer not verified */
ATA_DFLAG_INIT_MASK = (1 << 24) - 1,
ATA_DFLAG_DETACH = (1 << 24),
@ -560,6 +561,8 @@ struct ata_eh_context {
int tries[ATA_MAX_DEVICES];
unsigned int classes[ATA_MAX_DEVICES];
unsigned int did_probe_mask;
unsigned int saved_ncq_enabled;
u8 saved_xfer_mode[ATA_MAX_DEVICES];
};
struct ata_acpi_drive