Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
[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>
authored by Tejun Heo and committed by Jeff Garzik 62ba2841 e922256a
+3
-1
drivers/scsi/libata-core.c
+3
-1
drivers/scsi/libata-core.c
···
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if (ap->flags & ATA_FLAG_SATA_RESET) {
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/* issue phy wake/reset */
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scr_write_flush(ap, SCR_CONTROL, 0x301);
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-
udelay(400); /* FIXME: a guess */
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+
/* Couldn't find anything in SATA I/II specs, but
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+
* AHCI-1.1 10.4.2 says at least 1 ms. */
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+
mdelay(1);
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}
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scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
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