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[PATCH] libata: Fix a drive detection problem

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The current code follows the spec but uses an overlong delay. This would
be great if the hardware did. Several vendors however forget the D7
pulldown. Fortunately 0xFF isnt a sane reset state so we can use it to
skip detection as is done in drivers/ide. (ie this is a tested solution
over a long time)

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Alan Cox 2006-03-22 15:52:40 +00:00 committed by Jeff Garzik
parent 7c74ffd072
commit 09c7ad79dc
1 changed files with 10 additions and 0 deletions
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10
drivers/scsi/libata-core.c
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@ -2001,9 +2001,19 @@ static unsigned int ata_bus_softreset(struct ata_port *ap,
* status is checked. Because waiting for "a while" before
* checking status is fine, post SRST, we perform this magic
* delay here as well.
*
* Old drivers/ide uses the 2mS rule and then waits for ready
*/
msleep(150);
/* Before we perform post reset processing we want to see if
the bus shows 0xFF because the odd clown forgets the D7 pulldown
resistor */
if (ata_check_status(ap) == 0xFF)
return 1; /* Positive is failure for some reason */
ata_bus_post_reset(ap, devmask);
return 0;