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author | Wolfgang Wiedmeyer <wolfgit@wiedmeyer.de> | 2015-10-23 03:29:33 +0200 |
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committer | Wolfgang Wiedmeyer <wolfgit@wiedmeyer.de> | 2015-10-23 03:29:33 +0200 |
commit | 15dfd0df63ce6847081d09b2bbd567cc0cc4eae1 (patch) | |
tree | 3b73f24fcef970bfcace3cbb297cfa57f3994682 /Documentation/sound/alsa/HD-Audio.txt | |
parent | 328aa7a45af61bc0060c80847daa67fef7b9c0d0 (diff) | |
parent | 0149138c4142da287d23f9d5c6038f7fb5e30ac2 (diff) | |
download | kernel_samsung_smdk4412-15dfd0df63ce6847081d09b2bbd567cc0cc4eae1.zip kernel_samsung_smdk4412-15dfd0df63ce6847081d09b2bbd567cc0cc4eae1.tar.gz kernel_samsung_smdk4412-15dfd0df63ce6847081d09b2bbd567cc0cc4eae1.tar.bz2 |
initial merge with 3.2.72
Diffstat (limited to 'Documentation/sound/alsa/HD-Audio.txt')
-rw-r--r-- | Documentation/sound/alsa/HD-Audio.txt | 63 |
1 files changed, 57 insertions, 6 deletions
diff --git a/Documentation/sound/alsa/HD-Audio.txt b/Documentation/sound/alsa/HD-Audio.txt index c82beb0..91fee3b 100644 --- a/Documentation/sound/alsa/HD-Audio.txt +++ b/Documentation/sound/alsa/HD-Audio.txt @@ -447,7 +447,10 @@ 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. +until another codec entry is given. Passing 0 or a negative number to +the first or the second value will make the check of the corresponding +field be skipped. It'll be useful for really broken devices that don't +initialize SSID properly. The `[model]` line allows to change the model name of the each codec. In the example above, it will be changed to model=auto. @@ -491,7 +494,7 @@ Also, the codec chip name can be rewritten via `[chip_name]` line. 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 +`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 @@ -524,11 +527,59 @@ power-saving. See /sys/module/snd_hda_intel/parameters/power_save to check the current value. If it's non-zero, the feature is turned on. +Tracepoints +~~~~~~~~~~~ +The hd-audio driver gives a few basic tracepoints. +`hda:hda_send_cmd` traces each CORB write while `hda:hda_get_response` +traces the response from RIRB (only when read from the codec driver). +`hda:hda_bus_reset` traces the bus-reset due to fatal error, etc, +`hda:hda_unsol_event` traces the unsolicited events, and +`hda:hda_power_down` and `hda:hda_power_up` trace the power down/up +via power-saving behavior. + +Enabling all tracepoints can be done like +------------------------------------------------------------------------ + # echo 1 > /sys/kernel/debug/tracing/events/hda/enable +------------------------------------------------------------------------ +then after some commands, you can traces from +/sys/kernel/debug/tracing/trace file. For example, when you want to +trace what codec command is sent, enable the tracepoint like: +------------------------------------------------------------------------ + # cat /sys/kernel/debug/tracing/trace + # tracer: nop + # + # TASK-PID CPU# TIMESTAMP FUNCTION + # | | | | | + <...>-7807 [002] 105147.774889: hda_send_cmd: [0:0] val=e3a019 + <...>-7807 [002] 105147.774893: hda_send_cmd: [0:0] val=e39019 + <...>-7807 [002] 105147.999542: hda_send_cmd: [0:0] val=e3a01a + <...>-7807 [002] 105147.999543: hda_send_cmd: [0:0] val=e3901a + <...>-26764 [001] 349222.837143: hda_send_cmd: [0:0] val=e3a019 + <...>-26764 [001] 349222.837148: hda_send_cmd: [0:0] val=e39019 + <...>-26764 [001] 349223.058539: hda_send_cmd: [0:0] val=e3a01a + <...>-26764 [001] 349223.058541: hda_send_cmd: [0:0] val=e3901a +------------------------------------------------------------------------ +Here `[0:0]` indicates the card number and the codec address, and +`val` shows the value sent to the codec, respectively. The value is +a packed value, and you can decode it via hda-decode-verb program +included in hda-emu package below. For example, the value e3a019 is +to set the left output-amp value to 25. +------------------------------------------------------------------------ + % hda-decode-verb 0xe3a019 + raw value = 0x00e3a019 + cid = 0, nid = 0x0e, verb = 0x3a0, parm = 0x19 + raw value: verb = 0x3a0, parm = 0x19 + verbname = set_amp_gain_mute + amp raw val = 0xa019 + output, left, idx=0, mute=0, val=25 +------------------------------------------------------------------------ + + Development Tree ~~~~~~~~~~~~~~~~ The latest development codes for HD-audio are found on sound git tree: -- git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6.git +- git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git The master branch or for-next branches can be used as the main development branches in general while the HD-audio specific patches @@ -543,7 +594,7 @@ is, installed via the usual spells: configure, make and make install(-modules). See INSTALL in the package. The snapshot tarballs are found at: -- ftp://ftp.kernel.org/pub/linux/kernel/people/tiwai/snapshot/ +- ftp://ftp.suse.com/pub/people/tiwai/snapshot/ Sending a Bug Report @@ -645,7 +696,7 @@ via hda-verb won't change the mixer value. The hda-verb program is found in the ftp directory: -- ftp://ftp.kernel.org/pub/linux/kernel/people/tiwai/misc/ +- ftp://ftp.suse.com/pub/people/tiwai/misc/ Also a git repository is available: @@ -713,7 +764,7 @@ operation, the jack plugging simulation, etc. The package is found in: -- ftp://ftp.kernel.org/pub/linux/kernel/people/tiwai/misc/ +- ftp://ftp.suse.com/pub/people/tiwai/misc/ A git repository is available: |