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| author | Takashi Iwai <tiwai@suse.de> | 2009-06-17 17:30:54 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2009-06-24 11:53:43 +0200 |
| commit | 1e7b8c87cb53d9a14f1a9ef35eed739f68851f5c (patch) | |
| tree | 4f3f3c2b3db2b40e419f7d3f9fb72b785f0f2e3d /Documentation/sound | |
| parent | 768248256339da88d65088c8beffe1a3dcd9f1ca (diff) | |
| download | lwn-1e7b8c87cb53d9a14f1a9ef35eed739f68851f5c.tar.gz lwn-1e7b8c87cb53d9a14f1a9ef35eed739f68851f5c.zip | |
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.txt | 4 | ||||
| -rw-r--r-- | Documentation/sound/alsa/HD-Audio.txt | 16 |
2 files changed, 19 insertions, 1 deletions
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt index 012858d2b119..414700b996ae 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 8bc9867c0a3a..55aab1168236 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 ~~~~~~~~~~~~ |