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authorVincent Pelletier <plr.vincent@gmail.com>2013-05-21 22:30:58 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-01-09 12:24:23 -0800
commit3d097b15182906eaf121c48697ceda0ab9ddf55e (patch)
tree8ed02a0a359761578bac38e94c59a3265188f5aa /Documentation
parent6dcccce8791fa72bff307f6c2506d323705102cd (diff)
downloadlinux-linaro-stable-3d097b15182906eaf121c48697ceda0ab9ddf55e.tar.gz
libata: Add atapi_dmadir force flag
commit 966fbe193f47c68e70a80ec9991098e88e7959cb upstream. 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 <plr.vincent@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/kernel-parameters.txt2
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 2fe6e767b3d6..96401631523d 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -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.