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libata: Add atapi_dmadir force flag

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Some device require DMADIR to be enabled, but are not detected as such
by atapi_id_dmadir.  One such example is "Asus Serillel 2"
SATA-host-to-PATA-device bridge: the bridge itself requires DMADIR,
even if the bridged device does not.

As atapi_dmadir module parameter can cause problems with some devices
(as per Tejun Heo's memory), enabling it globally may not be possible
depending on the hardware.

This patch adds atapi_dmadir in the form of a "force" horkage value,
allowing global, per-bus and per-device control.

Signed-off-by: Vincent Pelletier <[email protected]>
Signed-off-by: Tejun Heo <[email protected]>
This commit is contained in:
Vincent Pelletier 2013-05-21 22:30:58 +02:00 • committed by Tejun Heo
commit 966fbe193f
3 changed files with 5 additions and 1 deletions
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2
Documentation/kernel-parameters.txt
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@ -1456,6 +1456,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
* dump_id: dump IDENTIFY data.
* atapi_dmadir: Enable ATAPI DMADIR bridge support
If there are multiple matching configurations changing
the same attribute, the last one is used.