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| author | Tejun Heo <htejun@gmail.com> | 2005-06-26 23:27:19 +0900 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@pobox.com> | 2005-06-28 00:05:57 -0400 |
| commit | 62ba2841f2a51848f7cb0499edae3f6803764f2c (patch) | |
| tree | 8e945184504d0ed608c6e58f092b5c819d1cb098 /drivers/scsi/libata-core.c | |
| parent | e922256ae4bb6ef954bd7e0740d9753460e0ab72 (diff) | |
| download | lwn-62ba2841f2a51848f7cb0499edae3f6803764f2c.tar.gz lwn-62ba2841f2a51848f7cb0499edae3f6803764f2c.zip | |
[PATCH] libata: lengthen COMMRESET delay
This patch lengthens the delay between DET setting and clearing for
COMMRESET from 400us to 1ms. I couldn't find any requiremen regarding
the duration of COMMRESET in SATA I/II specs but AHCI-1.1 10.4.2
states that it should be at least 1ms.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Diffstat (limited to 'drivers/scsi/libata-core.c')
| -rw-r--r-- | drivers/scsi/libata-core.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c index fd66f56fd612..cb535fa185b9 100644 --- a/drivers/scsi/libata-core.c +++ b/drivers/scsi/libata-core.c @@ -1408,7 +1408,9 @@ void __sata_phy_reset(struct ata_port *ap) if (ap->flags & ATA_FLAG_SATA_RESET) { /* issue phy wake/reset */ scr_write_flush(ap, SCR_CONTROL, 0x301); - udelay(400); /* FIXME: a guess */ + /* Couldn't find anything in SATA I/II specs, but + * AHCI-1.1 10.4.2 says at least 1 ms. */ + mdelay(1); } scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */ |