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17 May 2024, 09:02:56 UTC
Revision 9116300634c5c76cfcd0d2af689846e04d172256 authored by Tejun Heo on 21 February 2008, 04:25:50 UTC, committed by Jeff Garzik on 24 February 2008, 05:27:33 UTC 
libata: automatically use DMADIR if drive/bridge requires it
 
Back in 2.6.17-rc2, a libata module parameter was added for atapi_dmadir.

That's nice, but most SATA devices which need it will tell us about it
in their IDENTIFY PACKET response, as bit-15 of word-62 of the
returned data (as per ATA7, ATA8 specifications).

So for those which specify it, we should automatically use the DMADIR bit.
Otherwise, disc writing will fail by default on many SATA-ATAPI drives.

This patch adds ATA_DFLAG_DMADIR and make ata_dev_configure() set it
if atapi_dmadir is set or identify data indicates DMADIR is necessary.
atapi_xlat() is converted to check ATA_DFLAG_DMADIR before setting
DMADIR.

Original patch is from Mark Lord.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
1 parent 559bbe6
History
Tip revision: 9116300634c5c76cfcd0d2af689846e04d172256 authored by Tejun Heo on 21 February 2008, 04:25:50 UTC
libata: automatically use DMADIR if drive/bridge requires it
Tip revision: 9116300
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