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libata: handle broken cable reporting

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One or two ancient drives predated the cable spec and didn't sent the
valid bits for the field. I had hoped to leave this out of libata as a
piece of historical annoyance but a recent CD drive shows the same bug so
we have to import support for it.

Same concept as Bartlomiej's changes old IDE except that as we have
centralised blacklists we can avoid keeping another private table of stuff

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Alan Cox 2007-11-05 22:58:58 +00:00 • committed by Jeff Garzik
parent 73946f9fc5
commit 6bbfd53d47
3 changed files with 30 additions and 1 deletions
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9
include/linux/ata.h
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@ -537,6 +537,15 @@ static inline int ata_drive_40wire(const u16 *dev_id)
return 1;
}
static inline int ata_drive_40wire_relaxed(const u16 *dev_id)
{
if (ata_id_is_sata(dev_id))
return 0; /* SATA */
if ((dev_id[93] & 0x2000) == 0x2000)
return 0; /* 80 wire */
return 1;
}
static inline int atapi_cdb_len(const u16 *dev_id)
{
u16 tmp = dev_id[0] & 0x3;