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authorTakashi Iwai <tiwai@suse.de>2009-06-17 17:30:54 +0200
committerTakashi Iwai <tiwai@suse.de>2009-06-24 11:53:43 +0200
commit1e7b8c87cb53d9a14f1a9ef35eed739f68851f5c (patch)
tree4f3f3c2b3db2b40e419f7d3f9fb72b785f0f2e3d /Documentation/sound
parent768248256339da88d65088c8beffe1a3dcd9f1ca (diff)
ALSA: hda - More description about patch module option
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'Documentation/sound')
-rw-r--r--Documentation/sound/alsa/ALSA-Configuration.txt4
-rw-r--r--Documentation/sound/alsa/HD-Audio.txt16
2 files changed, 19 insertions, 1 deletions
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index 012858d2b11..414700b996a 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -749,6 +749,10 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
bdl_pos_adj - Specifies the DMA IRQ timing delay in samples.
Passing -1 will make the driver to choose the appropriate
value based on the controller chip.
+ patch - Specifies the early "patch" files to modify the HD-audio
+ setup before initializing the codecs. This option is
+ available only when CONFIG_SND_HDA_PATCH_LOADER=y is set.
+ See HD-Audio.txt for details.
[Single (global) options]
single_cmd - Use single immediate commands to communicate with
diff --git a/Documentation/sound/alsa/HD-Audio.txt b/Documentation/sound/alsa/HD-Audio.txt
index 8bc9867c0a3..55aab116823 100644
--- a/Documentation/sound/alsa/HD-Audio.txt
+++ b/Documentation/sound/alsa/HD-Audio.txt
@@ -410,7 +410,7 @@ firmware file for modifying the HD-audio setup before initializing the
codec. This can work basically like the reconfiguration via sysfs in
the above, but it does it before the first codec configuration.
-The patch file looks like below:
+A patch file is a plain text file which looks like below:
------------------------------------------------------------------------
[codec]
@@ -448,6 +448,20 @@ Similarly, the lines after `[verb]` are parsed as `init_verbs`
sysfs entries, and the lines after `[hint]` are parsed as `hints`
sysfs entries, respectively.
+The hd-audio driver reads the file via request_firmware(). Thus,
+a patch file has to be located on the appropriate firmware path,
+typically, /lib/firmware. For example, when you pass the option
+`patch=hda-init.fw`, the file /lib/firmware/hda-init-fw must be
+present.
+
+The patch module option is specific to each card instance, and you
+need to give one file name for each instance, separated by commas.
+For example, if you have two cards, one for an on-board analog and one
+for an HDMI video board, you may pass patch option like below:
+------------------------------------------------------------------------
+ options snd-hda-intel patch=on-board-patch,hdmi-patch
+------------------------------------------------------------------------
+
Power-Saving
~~~~~~~~~~~~