From 768248256339da88d65088c8beffe1a3dcd9f1ca Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Wed, 17 Jun 2009 17:17:18 +0200 Subject: ALSA: hda - Add description about patch loading Signed-off-by: Takashi Iwai --- Documentation/sound/alsa/HD-Audio.txt | 46 +++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) (limited to 'Documentation/sound/alsa/HD-Audio.txt') diff --git a/Documentation/sound/alsa/HD-Audio.txt b/Documentation/sound/alsa/HD-Audio.txt index 88b7433d2f11..8bc9867c0a3a 100644 --- a/Documentation/sound/alsa/HD-Audio.txt +++ b/Documentation/sound/alsa/HD-Audio.txt @@ -403,6 +403,52 @@ re-configure based on that state, run like below: ------------------------------------------------------------------------ +Early Patching +~~~~~~~~~~~~~~ +When CONFIG_SND_HDA_PATCH_LOADER=y is set, you can pass a "patch" as a +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: + +------------------------------------------------------------------------ + [codec] + 0x12345678 0xabcd1234 2 + + [model] + auto + + [pincfg] + 0x12 0x411111f0 + + [verb] + 0x20 0x500 0x03 + 0x20 0x400 0xff + + [hint] + hp_detect = yes +------------------------------------------------------------------------ + +The file needs to have a line `[codec]`. The next line should contain +three numbers indicating the codec vendor-id (0x12345678 in the +example), the codec subsystem-id (0xabcd1234) and the address (2) of +the codec. The rest patch entries are applied to this specified codec +until another codec entry is given. + +The `[model]` line allows to change the model name of the each codec. +In the example above, it will be changed to model=auto. +Note that this overrides the module option. + +After the `[pincfg]` line, the contents are parsed as the initial +default pin-configurations just like `user_pin_configs` sysfs above. +The values can be shown in user_pin_configs sysfs file, too. + +Similarly, the lines after `[verb]` are parsed as `init_verbs` +sysfs entries, and the lines after `[hint]` are parsed as `hints` +sysfs entries, respectively. + + Power-Saving ~~~~~~~~~~~~ The power-saving is a kind of auto-suspend of the device. When the -- cgit v1.2.1 From 1e7b8c87cb53d9a14f1a9ef35eed739f68851f5c Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Wed, 17 Jun 2009 17:30:54 +0200 Subject: ALSA: hda - More description about patch module option Signed-off-by: Takashi Iwai --- Documentation/sound/alsa/HD-Audio.txt | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) (limited to 'Documentation/sound/alsa/HD-Audio.txt') 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 ~~~~~~~~~~~~ -- cgit v1.2.1