[alsa-devel] [PATCH 04/30] ALSA: doc: ReSTize HD-Audio document
Takashi Iwai
tiwai at suse.de
Thu Nov 10 22:06:15 CET 2016
The original HD-Audio.txt was already in asciidoc format, so it's a
simple conversion in the end.
A new subdirectory, Documentation/sound/hd-audio, is created and the
document is moved there with another file name to match better with
the recent Documentation tree structure.
Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
Documentation/sound/hd-audio/index.rst | 7 +
.../{alsa/HD-Audio.txt => hd-audio/notes.rst} | 635 +++++++++++----------
Documentation/sound/index.rst | 1 +
3 files changed, 339 insertions(+), 304 deletions(-)
create mode 100644 Documentation/sound/hd-audio/index.rst
rename Documentation/sound/{alsa/HD-Audio.txt => hd-audio/notes.rst} (61%)
diff --git a/Documentation/sound/hd-audio/index.rst b/Documentation/sound/hd-audio/index.rst
new file mode 100644
index 000000000000..f2dc29019f12
--- /dev/null
+++ b/Documentation/sound/hd-audio/index.rst
@@ -0,0 +1,7 @@
+HD-Audio
+========
+
+.. toctree::
+ :maxdepth: 2
+
+ notes
diff --git a/Documentation/sound/alsa/HD-Audio.txt b/Documentation/sound/hd-audio/notes.rst
similarity index 61%
rename from Documentation/sound/alsa/HD-Audio.txt
rename to Documentation/sound/hd-audio/notes.rst
index d4510ebf2e8c..168d0cfab1ce 100644
--- a/Documentation/sound/alsa/HD-Audio.txt
+++ b/Documentation/sound/hd-audio/notes.rst
@@ -1,10 +1,12 @@
-MORE NOTES ON HD-AUDIO DRIVER
=============================
- Takashi Iwai <tiwai at suse.de>
+More Notes on HD-Audio Driver
+=============================
+Takashi Iwai <tiwai at suse.de>
-GENERAL
--------
+
+General
+=======
HD-audio is the new standard on-board audio component on modern PCs
after AC97. Although Linux has been supporting HD-audio since long
@@ -40,28 +42,28 @@ If you are interested in the deep debugging of HD-audio, read the
HD-audio specification at first. The specification is found on
Intel's web page, for example:
-- http://www.intel.com/standards/hdaudio/
+* http://www.intel.com/standards/hdaudio/
-HD-AUDIO CONTROLLER
--------------------
+HD-Audio Controller
+===================
DMA-Position Problem
-~~~~~~~~~~~~~~~~~~~~
+--------------------
The most common problem of the controller is the inaccurate DMA
pointer reporting. The DMA pointer for playback and capture can be
read in two ways, either via a LPIB register or via a position-buffer
map. As default the driver tries to read from the io-mapped
position-buffer, and falls back to LPIB if the position-buffer appears
dead. However, this detection isn't perfect on some devices. In such
-a case, you can change the default method via `position_fix` option.
+a case, you can change the default method via ``position_fix`` option.
-`position_fix=1` means to use LPIB method explicitly.
-`position_fix=2` means to use the position-buffer.
-`position_fix=3` means to use a combination of both methods, needed
+``position_fix=1`` means to use LPIB method explicitly.
+``position_fix=2`` means to use the position-buffer.
+``position_fix=3`` means to use a combination of both methods, needed
for some VIA controllers. The capture stream position is corrected
by comparing both LPIB and position-buffer values.
-`position_fix=4` is another combination available for all controllers,
+``position_fix=4`` is another combination available for all controllers,
and uses LPIB for the playback and the position-buffer for the capture
streams.
0 is the default value for all other
@@ -74,9 +76,9 @@ the wake-up timing. It wakes up a few samples before actually
processing the data on the buffer. This caused a lot of problems, for
example, with ALSA dmix or JACK. Since 2.6.27 kernel, the driver puts
an artificial delay to the wake up timing. This delay is controlled
-via `bdl_pos_adj` option.
+via ``bdl_pos_adj`` option.
-When `bdl_pos_adj` is a negative value (as default), it's assigned to
+When ``bdl_pos_adj`` is a negative value (as default), it's assigned to
an appropriate value depending on the controller chip. For Intel
chips, it'd be 1 while it'd be 32 for others. Usually this works.
Only in case it doesn't work and you get warning messages, you should
@@ -84,19 +86,19 @@ change this parameter to other values.
Codec-Probing Problem
-~~~~~~~~~~~~~~~~~~~~~
+---------------------
A less often but a more severe problem is the codec probing. When
BIOS reports the available codec slots wrongly, the driver gets
confused and tries to access the non-existing codec slot. This often
results in the total screw-up, and destructs the further communication
with the codec chips. The symptom appears usually as error messages
like:
-------------------------------------------------------------------------
- hda_intel: azx_get_response timeout, switching to polling mode:
- last cmd=0x12345678
- hda_intel: azx_get_response timeout, switching to single_cmd mode:
- last cmd=0x12345678
-------------------------------------------------------------------------
+::
+
+ hda_intel: azx_get_response timeout, switching to polling mode:
+ last cmd=0x12345678
+ hda_intel: azx_get_response timeout, switching to single_cmd mode:
+ last cmd=0x12345678
The first line is a warning, and this is usually relatively harmless.
It means that the codec response isn't notified via an IRQ. The
@@ -108,24 +110,24 @@ it means that something is really wrong. Most likely you are
accessing a non-existing codec slot.
Thus, if the second error message appears, try to narrow the probed
-codec slots via `probe_mask` option. It's a bitmask, and each bit
+codec slots via ``probe_mask`` option. It's a bitmask, and each bit
corresponds to the codec slot. For example, to probe only the first
-slot, pass `probe_mask=1`. For the first and the third slots, pass
-`probe_mask=5` (where 5 = 1 | 4), and so on.
+slot, pass ``probe_mask=1``. For the first and the third slots, pass
+``probe_mask=5`` (where 5 = 1 | 4), and so on.
Since 2.6.29 kernel, the driver has a more robust probing method, so
this error might happen rarely, though.
On a machine with a broken BIOS, sometimes you need to force the
driver to probe the codec slots the hardware doesn't report for use.
-In such a case, turn the bit 8 (0x100) of `probe_mask` option on.
+In such a case, turn the bit 8 (0x100) of ``probe_mask`` option on.
Then the rest 8 bits are passed as the codec slots to probe
-unconditionally. For example, `probe_mask=0x103` will force to probe
+unconditionally. For example, ``probe_mask=0x103`` will force to probe
the codec slots 0 and 1 no matter what the hardware reports.
Interrupt Handling
-~~~~~~~~~~~~~~~~~~
+------------------
HD-audio driver uses MSI as default (if available) since 2.6.33
kernel as MSI works better on some machines, and in general, it's
better for performance. However, Nvidia controllers showed bad
@@ -134,17 +136,17 @@ thus we disabled MSI for them.
There seem also still other devices that don't work with MSI. If you
see a regression wrt the sound quality (stuttering, etc) or a lock-up
-in the recent kernel, try to pass `enable_msi=0` option to disable
+in the recent kernel, try to pass ``enable_msi=0`` option to disable
MSI. If it works, you can add the known bad device to the blacklist
defined in hda_intel.c. In such a case, please report and give the
patch back to the upstream developer.
-HD-AUDIO CODEC
---------------
+HD-Audio Codec
+==============
Model Option
-~~~~~~~~~~~~
+------------
The most common problem regarding the HD-audio driver is the
unsupported codec features or the mismatched device configuration.
Most of codec-specific code has several preset models, either to
@@ -153,13 +155,15 @@ override the BIOS setup or to provide more comprehensive features.
The driver checks PCI SSID and looks through the static configuration
table until any matching entry is found. If you have a new machine,
you may see a message like below:
-------------------------------------------------------------------------
+::
+
hda_codec: ALC880: BIOS auto-probing.
-------------------------------------------------------------------------
+
Meanwhile, in the earlier versions, you would see a message like:
-------------------------------------------------------------------------
+::
+
hda_codec: Unknown model for ALC880, trying auto-probe from BIOS...
-------------------------------------------------------------------------
+
Even if you see such a message, DON'T PANIC. Take a deep breath and
keep your towel. First of all, it's an informational message, no
warning, no error. This means that the PCI SSID of your device isn't
@@ -182,32 +186,33 @@ model is found in the white-list, the driver assumes the static
configuration of that preset with the correct pin setup, etc.
Thus, if you have a newer machine with a slightly different PCI SSID
(or codec SSID) from the existing one, you may have a good chance to
-re-use the same model. You can pass the `model` option to specify the
+re-use the same model. You can pass the ``model`` option to specify the
preset model instead of PCI (and codec-) SSID look-up.
-What `model` option values are available depends on the codec chip.
+What ``model`` option values are available depends on the codec chip.
Check your codec chip from the codec proc file (see "Codec Proc-File"
section below). It will show the vendor/product name of your codec
-chip. Then, see Documentation/sound/alsa/HD-Audio-Models.txt file,
+chip. Then, see Documentation/sound/HD-Audio-Models.rst file,
the section of HD-audio driver. You can find a list of codecs
-and `model` options belonging to each codec. For example, for Realtek
-ALC262 codec chip, pass `model=ultra` for devices that are compatible
+and ``model`` options belonging to each codec. For example, for Realtek
+ALC262 codec chip, pass ``model=ultra`` for devices that are compatible
with Samsung Q1 Ultra.
Thus, the first thing you can do for any brand-new, unsupported and
non-working HD-audio hardware is to check HD-audio codec and several
-different `model` option values. If you have any luck, some of them
+different ``model`` option values. If you have any luck, some of them
might suit with your device well.
There are a few special model option values:
-- when 'nofixup' is passed, the device-specific fixups in the codec
+
+* when 'nofixup' is passed, the device-specific fixups in the codec
parser are skipped.
-- when `generic` is passed, the codec-specific parser is skipped and
+* when ``generic`` is passed, the codec-specific parser is skipped and
only the generic parser is used.
Speaker and Headphone Output
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+----------------------------
One of the most frequent (and obvious) bugs with HD-audio is the
silent output from either or both of a built-in speaker and a
headphone jack. In general, you should try a headphone output at
@@ -236,23 +241,23 @@ report. See the bug report section for details.
If you are masochistic enough to debug the driver problem, note the
following:
-- The speaker (and the headphone, too) output often requires the
+* The speaker (and the headphone, too) output often requires the
external amplifier. This can be set usually via EAPD verb or a
certain GPIO. If the codec pin supports EAPD, you have a better
chance via SET_EAPD_BTL verb (0x70c). On others, GPIO pin (mostly
it's either GPIO0 or GPIO1) may turn on/off EAPD.
-- Some Realtek codecs require special vendor-specific coefficients to
+* Some Realtek codecs require special vendor-specific coefficients to
turn on the amplifier. See patch_realtek.c.
-- IDT codecs may have extra power-enable/disable controls on each
+* IDT codecs may have extra power-enable/disable controls on each
analog pin. See patch_sigmatel.c.
-- Very rare but some devices don't accept the pin-detection verb until
+* Very rare but some devices don't accept the pin-detection verb until
triggered. Issuing GET_PIN_SENSE verb (0xf09) may result in the
codec-communication stall. Some examples are found in
patch_realtek.c.
Capture Problems
-~~~~~~~~~~~~~~~~
+----------------
The capture problems are often because of missing setups of mixers.
Thus, before submitting a bug report, make sure that you set up the
mixer correctly. For example, both "Capture Volume" and "Capture
@@ -284,7 +289,7 @@ submit the improvement patch to the author.
Direct Debugging
-~~~~~~~~~~~~~~~~
+----------------
If no model option gives you a better result, and you are a tough guy
to fight against evil, try debugging via hitting the raw HD-audio
codec verbs to the device. Some tools are available: hda-emu and
@@ -293,45 +298,45 @@ below. You'd need to enable hwdep for using these tools. See "Kernel
Configuration" section.
-OTHER ISSUES
-------------
+Other Issues
+============
Kernel Configuration
-~~~~~~~~~~~~~~~~~~~~
+--------------------
In general, I recommend you to enable the sound debug option,
-`CONFIG_SND_DEBUG=y`, no matter whether you are debugging or not.
+``CONFIG_SND_DEBUG=y``, no matter whether you are debugging or not.
This enables snd_printd() macro and others, and you'll get additional
kernel messages at probing.
-In addition, you can enable `CONFIG_SND_DEBUG_VERBOSE=y`. But this
+In addition, you can enable ``CONFIG_SND_DEBUG_VERBOSE=y``. But this
will give you far more messages. Thus turn this on only when you are
sure to want it.
-Don't forget to turn on the appropriate `CONFIG_SND_HDA_CODEC_*`
+Don't forget to turn on the appropriate ``CONFIG_SND_HDA_CODEC_*``
options. Note that each of them corresponds to the codec chip, not
the controller chip. Thus, even if lspci shows the Nvidia controller,
you may need to choose the option for other vendors. If you are
unsure, just select all yes.
-`CONFIG_SND_HDA_HWDEP` is a useful option for debugging the driver.
+``CONFIG_SND_HDA_HWDEP`` is a useful option for debugging the driver.
When this is enabled, the driver creates hardware-dependent devices
(one per each codec), and you have a raw access to the device via
-these device files. For example, `hwC0D2` will be created for the
+these device files. For example, ``hwC0D2`` will be created for the
codec slot #2 of the first card (#0). For debug-tools such as
hda-verb and hda-analyzer, the hwdep device has to be enabled.
Thus, it'd be better to turn this on always.
-`CONFIG_SND_HDA_RECONFIG` is a new option, and this depends on the
+``CONFIG_SND_HDA_RECONFIG`` is a new option, and this depends on the
hwdep option above. When enabled, you'll have some sysfs files under
the corresponding hwdep directory. See "HD-audio reconfiguration"
section below.
-`CONFIG_SND_HDA_POWER_SAVE` option enables the power-saving feature.
+``CONFIG_SND_HDA_POWER_SAVE`` option enables the power-saving feature.
See "Power-saving" section below.
Codec Proc-File
-~~~~~~~~~~~~~~~
+---------------
The codec proc-file is a treasure-chest for debugging HD-audio.
It shows most of useful information of each codec widget.
@@ -351,161 +356,178 @@ will appear as "Realtek ID 0262", instead of "Realtek ALC262".
HD-Audio Reconfiguration
-~~~~~~~~~~~~~~~~~~~~~~~~
+------------------------
This is an experimental feature to allow you re-configure the HD-audio
codec dynamically without reloading the driver. The following sysfs
files are available under each codec-hwdep device directory (e.g.
/sys/class/sound/hwC0D0):
-vendor_id::
- Shows the 32bit codec vendor-id hex number. You can change the
- vendor-id value by writing to this file.
-subsystem_id::
- Shows the 32bit codec subsystem-id hex number. You can change the
- subsystem-id value by writing to this file.
-revision_id::
- Shows the 32bit codec revision-id hex number. You can change the
- revision-id value by writing to this file.
-afg::
- Shows the AFG ID. This is read-only.
-mfg::
- Shows the MFG ID. This is read-only.
-name::
- Shows the codec name string. Can be changed by writing to this
- file.
-modelname::
- Shows the currently set `model` option. Can be changed by writing
- to this file.
-init_verbs::
- The extra verbs to execute at initialization. You can add a verb by
- writing to this file. Pass three numbers: nid, verb and parameter
- (separated with a space).
-hints::
- Shows / stores hint strings for codec parsers for any use.
- Its format is `key = value`. For example, passing `jack_detect = no`
- will disable the jack detection of the machine completely.
-init_pin_configs::
- Shows the initial pin default config values set by BIOS.
-driver_pin_configs::
- Shows the pin default values set by the codec parser explicitly.
- This doesn't show all pin values but only the changed values by
- the parser. That is, if the parser doesn't change the pin default
- config values by itself, this will contain nothing.
-user_pin_configs::
- Shows the pin default config values to override the BIOS setup.
- Writing this (with two numbers, NID and value) appends the new
- value. The given will be used instead of the initial BIOS value at
- the next reconfiguration time. Note that this config will override
- even the driver pin configs, too.
-reconfig::
- Triggers the codec re-configuration. When any value is written to
- this file, the driver re-initialize and parses the codec tree
- again. All the changes done by the sysfs entries above are taken
- into account.
-clear::
- Resets the codec, removes the mixer elements and PCM stuff of the
- specified codec, and clear all init verbs and hints.
+vendor_id
+ Shows the 32bit codec vendor-id hex number. You can change the
+ vendor-id value by writing to this file.
+subsystem_id
+ Shows the 32bit codec subsystem-id hex number. You can change the
+ subsystem-id value by writing to this file.
+revision_id
+ Shows the 32bit codec revision-id hex number. You can change the
+ revision-id value by writing to this file.
+afg
+ Shows the AFG ID. This is read-only.
+mfg
+ Shows the MFG ID. This is read-only.
+name
+ Shows the codec name string. Can be changed by writing to this
+ file.
+modelname
+ Shows the currently set ``model`` option. Can be changed by writing
+ to this file.
+init_verbs
+ The extra verbs to execute at initialization. You can add a verb by
+ writing to this file. Pass three numbers: nid, verb and parameter
+ (separated with a space).
+hints
+ Shows / stores hint strings for codec parsers for any use.
+ Its format is ``key = value``. For example, passing ``jack_detect = no``
+ will disable the jack detection of the machine completely.
+init_pin_configs
+ Shows the initial pin default config values set by BIOS.
+driver_pin_configs
+ Shows the pin default values set by the codec parser explicitly.
+ This doesn't show all pin values but only the changed values by
+ the parser. That is, if the parser doesn't change the pin default
+ config values by itself, this will contain nothing.
+user_pin_configs
+ Shows the pin default config values to override the BIOS setup.
+ Writing this (with two numbers, NID and value) appends the new
+ value. The given will be used instead of the initial BIOS value at
+ the next reconfiguration time. Note that this config will override
+ even the driver pin configs, too.
+reconfig
+ Triggers the codec re-configuration. When any value is written to
+ this file, the driver re-initialize and parses the codec tree
+ again. All the changes done by the sysfs entries above are taken
+ into account.
+clear
+ Resets the codec, removes the mixer elements and PCM stuff of the
+ specified codec, and clear all init verbs and hints.
For example, when you want to change the pin default configuration
value of the pin widget 0x14 to 0x9993013f, and let the driver
re-configure based on that state, run like below:
-------------------------------------------------------------------------
- # echo 0x14 0x9993013f > /sys/class/sound/hwC0D0/user_pin_configs
- # echo 1 > /sys/class/sound/hwC0D0/reconfig
-------------------------------------------------------------------------
+::
+
+ # echo 0x14 0x9993013f > /sys/class/sound/hwC0D0/user_pin_configs
+ # echo 1 > /sys/class/sound/hwC0D0/reconfig
Hint Strings
-~~~~~~~~~~~~
+------------
The codec parser have several switches and adjustment knobs for
matching better with the actual codec or device behavior. Many of
them can be adjusted dynamically via "hints" strings as mentioned in
-the section above. For example, by passing `jack_detect = no` string
+the section above. For example, by passing ``jack_detect = no`` string
via sysfs or a patch file, you can disable the jack detection, thus
the codec parser will skip the features like auto-mute or mic
-auto-switch. As a boolean value, either `yes`, `no`, `true`, `false`,
-`1` or `0` can be passed.
+auto-switch. As a boolean value, either ``yes``, ``no``, ``true``, ``false``,
+``1`` or ``0`` can be passed.
The generic parser supports the following hints:
-- jack_detect (bool): specify whether the jack detection is available
- at all on this machine; default true
-- inv_jack_detect (bool): indicates that the jack detection logic is
- inverted
-- trigger_sense (bool): indicates that the jack detection needs the
- explicit call of AC_VERB_SET_PIN_SENSE verb
-- inv_eapd (bool): indicates that the EAPD is implemented in the
- inverted logic
-- pcm_format_first (bool): sets the PCM format before the stream tag
- and channel ID
-- sticky_stream (bool): keep the PCM format, stream tag and ID as long
- as possible; default true
-- spdif_status_reset (bool): reset the SPDIF status bits at each time
- the SPDIF stream is set up
-- pin_amp_workaround (bool): the output pin may have multiple amp
- values
-- single_adc_amp (bool): ADCs can have only single input amps
-- auto_mute (bool): enable/disable the headphone auto-mute feature;
- default true
-- auto_mic (bool): enable/disable the mic auto-switch feature; default
- true
-- line_in_auto_switch (bool): enable/disable the line-in auto-switch
- feature; default false
-- need_dac_fix (bool): limits the DACs depending on the channel count
-- primary_hp (bool): probe headphone jacks as the primary outputs;
- default true
-- multi_io (bool): try probing multi-I/O config (e.g. shared
- line-in/surround, mic/clfe jacks)
-- multi_cap_vol (bool): provide multiple capture volumes
-- inv_dmic_split (bool): provide split internal mic volume/switch for
- phase-inverted digital mics
-- indep_hp (bool): provide the independent headphone PCM stream and
- the corresponding mixer control, if available
-- add_stereo_mix_input (bool): add the stereo mix (analog-loopback
- mix) to the input mux if available
-- add_jack_modes (bool): add "xxx Jack Mode" enum controls to each
- I/O jack for allowing to change the headphone amp and mic bias VREF
- capabilities
-- power_save_node (bool): advanced power management for each widget,
- controlling the power sate (D0/D3) of each widget node depending on
- the actual pin and stream states
-- power_down_unused (bool): power down the unused widgets, a subset of
- power_save_node, and will be dropped in future
-- add_hp_mic (bool): add the headphone to capture source if possible
-- hp_mic_detect (bool): enable/disable the hp/mic shared input for a
- single built-in mic case; default true
-- mixer_nid (int): specifies the widget NID of the analog-loopback
- mixer
+jack_detect (bool)
+ specify whether the jack detection is available at all on this
+ machine; default true
+inv_jack_detect (bool)
+ indicates that the jack detection logic is inverted
+trigger_sense (bool)
+ indicates that the jack detection needs the explicit call of
+ AC_VERB_SET_PIN_SENSE verb
+inv_eapd (bool)
+ indicates that the EAPD is implemented in the inverted logic
+pcm_format_first (bool)
+ sets the PCM format before the stream tag and channel ID
+sticky_stream (bool)
+ keep the PCM format, stream tag and ID as long as possible;
+ default true
+spdif_status_reset (bool)
+ reset the SPDIF status bits at each time the SPDIF stream is set
+ up
+pin_amp_workaround (bool)
+ the output pin may have multiple amp values
+single_adc_amp (bool)
+ ADCs can have only single input amps
+auto_mute (bool)
+ enable/disable the headphone auto-mute feature; default true
+auto_mic (bool)
+ enable/disable the mic auto-switch feature; default true
+line_in_auto_switch (bool)
+ enable/disable the line-in auto-switch feature; default false
+need_dac_fix (bool)
+ limits the DACs depending on the channel count
+primary_hp (bool)
+ probe headphone jacks as the primary outputs; default true
+multi_io (bool)
+ try probing multi-I/O config (e.g. shared line-in/surround,
+ mic/clfe jacks)
+multi_cap_vol (bool)
+ provide multiple capture volumes
+inv_dmic_split (bool)
+ provide split internal mic volume/switch for phase-inverted
+ digital mics
+indep_hp (bool)
+ provide the independent headphone PCM stream and the corresponding
+ mixer control, if available
+add_stereo_mix_input (bool)
+ add the stereo mix (analog-loopback mix) to the input mux if
+ available
+add_jack_modes (bool)
+ add "xxx Jack Mode" enum controls to each I/O jack for allowing to
+ change the headphone amp and mic bias VREF capabilities
+power_save_node (bool)
+ advanced power management for each widget, controlling the power
+ sate (D0/D3) of each widget node depending on the actual pin and
+ stream states
+power_down_unused (bool)
+ power down the unused widgets, a subset of power_save_node, and
+ will be dropped in future
+add_hp_mic (bool)
+ add the headphone to capture source if possible
+hp_mic_detect (bool)
+ enable/disable the hp/mic shared input for a single built-in mic
+ case; default true
+mixer_nid (int)
+ specifies the widget NID of the analog-loopback mixer
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.
+--------------
+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.
A patch file is a plain text file which looks like below:
-------------------------------------------------------------------------
- [codec]
- 0x12345678 0xabcd1234 2
+::
+
+ [codec]
+ 0x12345678 0xabcd1234 2
- [model]
- auto
+ [model]
+ auto
- [pincfg]
- 0x12 0x411111f0
+ [pincfg]
+ 0x12 0x411111f0
- [verb]
- 0x20 0x500 0x03
- 0x20 0x400 0xff
+ [verb]
+ 0x20 0x500 0x03
+ 0x20 0x400 0xff
- [hint]
- jack_detect = no
-------------------------------------------------------------------------
+ [hint]
+ jack_detect = no
-The file needs to have a line `[codec]`. The next line should contain
+
+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
@@ -514,66 +536,68 @@ 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.
+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.
+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`
+Similarly, the lines after ``[verb]`` are parsed as ``init_verbs``
+sysfs entries, and the lines after ``[hint]`` are parsed as ``hints``
sysfs entries, respectively.
Another example to override the codec vendor id from 0x12345678 to
0xdeadbeef is like below:
-------------------------------------------------------------------------
- [codec]
- 0x12345678 0xabcd1234 2
+::
+
+ [codec]
+ 0x12345678 0xabcd1234 2
+
+ [vendor_id]
+ 0xdeadbeef
- [vendor_id]
- 0xdeadbeef
-------------------------------------------------------------------------
In the similar way, you can override the codec subsystem_id via
-`[subsystem_id]`, the revision id via `[revision_id]` line.
-Also, the codec chip name can be rewritten via `[chip_name]` line.
-------------------------------------------------------------------------
- [codec]
- 0x12345678 0xabcd1234 2
+``[subsystem_id]``, the revision id via ``[revision_id]`` line.
+Also, the codec chip name can be rewritten via ``[chip_name]`` line.
+::
+
+ [codec]
+ 0x12345678 0xabcd1234 2
+
+ [subsystem_id]
+ 0xffff1111
- [subsystem_id]
- 0xffff1111
+ [revision_id]
+ 0x10
- [revision_id]
- 0x10
+ [chip_name]
+ My-own NEWS-0002
- [chip_name]
- My-own NEWS-0002
-------------------------------------------------------------------------
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
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
-~~~~~~~~~~~~
+------------
The power-saving is a kind of auto-suspend of the device. When the
device is inactive for a certain time, the device is automatically
turned off to save the power. The time to go down is specified via
-`power_save` module option, and this option can be changed dynamically
+``power_save`` module option, and this option can be changed dynamically
via sysfs.
The power-saving won't work when the analog loopback is enabled on
@@ -592,63 +616,65 @@ The recent kernel supports the runtime PM for the HD-audio controller
chip, too. It means that the HD-audio controller is also powered up /
down dynamically. The feature is enabled only for certain controller
chips like Intel LynxPoint. You can enable/disable this feature
-forcibly by setting `power_save_controller` option, which is also
+forcibly by setting ``power_save_controller`` option, which is also
available at /sys/module/snd_hda_intel/parameters directory.
Tracepoints
-~~~~~~~~~~~
+-----------
The hd-audio driver gives a few basic tracepoints.
-`hda:hda_send_cmd` traces each CORB write while `hda:hda_get_response`
+``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
+``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
-------------------------------------------------------------------------
+::
+
+ # 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
+::
+
+ # 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
-------------------------------------------------------------------------
+::
+
+ % 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.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 development for the current
@@ -657,14 +683,14 @@ respectively.
Sending a Bug Report
-~~~~~~~~~~~~~~~~~~~~
+--------------------
If any model or module options don't work for your device, it's time
to send a bug report to the developers. Give the following in your
bug report:
-- Hardware vendor, product and model names
-- Kernel version (and ALSA-driver version if you built externally)
-- `alsa-info.sh` output; run with `--no-upload` option. See the
+* Hardware vendor, product and model names
+* Kernel version (and ALSA-driver version if you built externally)
+* ``alsa-info.sh`` output; run with ``--no-upload`` option. See the
section below about alsa-info
If it's a regression, at best, send alsa-info outputs of both working
@@ -673,60 +699,60 @@ compare the codec registers directly.
Send a bug report either the followings:
-kernel-bugzilla::
- https://bugzilla.kernel.org/
-alsa-devel ML::
- alsa-devel at alsa-project.org
+kernel-bugzilla
+ https://bugzilla.kernel.org/
+alsa-devel ML
+ alsa-devel at alsa-project.org
-DEBUG TOOLS
------------
+Debug Tools
+===========
This section describes some tools available for debugging HD-audio
problems.
alsa-info
-~~~~~~~~~
-The script `alsa-info.sh` is a very useful tool to gather the audio
+---------
+The script ``alsa-info.sh`` is a very useful tool to gather the audio
device information. It's included in alsa-utils package. The latest
version can be found on git repository:
-- git://git.alsa-project.org/alsa-utils.git
+* git://git.alsa-project.org/alsa-utils.git
The script can be fetched directly from the following URL, too:
-- http://www.alsa-project.org/alsa-info.sh
+* http://www.alsa-project.org/alsa-info.sh
Run this script as root, and it will gather the important information
such as the module lists, module parameters, proc file contents
including the codec proc files, mixer outputs and the control
elements. As default, it will store the information onto a web server
on alsa-project.org. But, if you send a bug report, it'd be better to
-run with `--no-upload` option, and attach the generated file.
+run with ``--no-upload`` option, and attach the generated file.
-There are some other useful options. See `--help` option output for
+There are some other useful options. See ``--help`` option output for
details.
When a probe error occurs or when the driver obviously assigns a
mismatched model, it'd be helpful to load the driver with
-`probe_only=1` option (at best after the cold reboot) and run
+``probe_only=1`` option (at best after the cold reboot) and run
alsa-info at this state. With this option, the driver won't configure
the mixer and PCM but just tries to probe the codec slot. After
probing, the proc file is available, so you can get the raw codec
information before modified by the driver. Of course, the driver
-isn't usable with `probe_only=1`. But you can continue the
+isn't usable with ``probe_only=1``. But you can continue the
configuration via hwdep sysfs file if hda-reconfig option is enabled.
-Using `probe_only` mask 2 skips the reset of HDA codecs (use
-`probe_only=3` as module option). The hwdep interface can be used
+Using ``probe_only`` mask 2 skips the reset of HDA codecs (use
+``probe_only=3`` as module option). The hwdep interface can be used
to determine the BIOS codec initialization.
hda-verb
-~~~~~~~~
+--------
hda-verb is a tiny program that allows you to access the HD-audio
codec directly. You can execute a raw HD-audio codec verb with this.
This program accesses the hwdep device, thus you need to enable the
-kernel config `CONFIG_SND_HDA_HWDEP=y` beforehand.
+kernel config ``CONFIG_SND_HDA_HWDEP=y`` beforehand.
The hda-verb program takes four arguments: the hwdep device file, the
widget NID, the verb and the parameter. When you access to the codec
@@ -739,19 +765,20 @@ parameter can be either a hex/digit number or a string corresponding
to a verb. Similarly, the last parameter is the value to write, or
can be a string for the parameter type.
-------------------------------------------------------------------------
- % hda-verb /dev/snd/hwC0D0 0x12 0x701 2
- nid = 0x12, verb = 0x701, param = 0x2
- value = 0x0
+::
+
+ % hda-verb /dev/snd/hwC0D0 0x12 0x701 2
+ nid = 0x12, verb = 0x701, param = 0x2
+ value = 0x0
- % hda-verb /dev/snd/hwC0D0 0x0 PARAMETERS VENDOR_ID
- nid = 0x0, verb = 0xf00, param = 0x0
- value = 0x10ec0262
+ % hda-verb /dev/snd/hwC0D0 0x0 PARAMETERS VENDOR_ID
+ nid = 0x0, verb = 0xf00, param = 0x0
+ value = 0x10ec0262
+
+ % hda-verb /dev/snd/hwC0D0 2 set_a 0xb080
+ nid = 0x2, verb = 0x300, param = 0xb080
+ value = 0x0
- % hda-verb /dev/snd/hwC0D0 2 set_a 0xb080
- nid = 0x2, verb = 0x300, param = 0xb080
- value = 0x0
-------------------------------------------------------------------------
Although you can issue any verbs with this program, the driver state
won't be always updated. For example, the volume values are usually
@@ -760,22 +787,22 @@ via hda-verb won't change the mixer value.
The hda-verb program is included now in alsa-tools:
-- git://git.alsa-project.org/alsa-tools.git
+* git://git.alsa-project.org/alsa-tools.git
Also, the old stand-alone package is found in the ftp directory:
-- ftp://ftp.suse.com/pub/people/tiwai/misc/
+* ftp://ftp.suse.com/pub/people/tiwai/misc/
Also a git repository is available:
-- git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/hda-verb.git
+* git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/hda-verb.git
See README file in the tarball for more details about hda-verb
program.
hda-analyzer
-~~~~~~~~~~~~
+------------
hda-analyzer provides a graphical interface to access the raw HD-audio
control, based on pyGTK2 binding. It's a more powerful version of
hda-verb. The program gives you an easy-to-use GUI stuff for showing
@@ -784,14 +811,14 @@ proc-compatible output.
The hda-analyzer:
-- http://git.alsa-project.org/?p=alsa.git;a=tree;f=hda-analyzer
+* http://git.alsa-project.org/?p=alsa.git;a=tree;f=hda-analyzer
is a part of alsa.git repository in alsa-project.org:
-- git://git.alsa-project.org/alsa.git
+* git://git.alsa-project.org/alsa.git
Codecgraph
-~~~~~~~~~~
+----------
Codecgraph is a utility program to generate a graph and visualizes the
codec-node connection of a codec chip. It's especially useful when
you analyze or debug a codec without a proper datasheet. The program
@@ -800,11 +827,11 @@ program.
The tarball and GIT trees are found in the web page at:
-- http://helllabs.org/codecgraph/
+* http://helllabs.org/codecgraph/
hda-emu
-~~~~~~~
+-------
hda-emu is an HD-audio emulator. The main purpose of this program is
to debug an HD-audio codec without the real hardware. Thus, it
doesn't emulate the behavior with the real audio I/O, but it just
@@ -817,13 +844,14 @@ codec proc collections in the tarball. Then, run the program with the
proc file, and the hda-emu program will start parsing the codec file
and simulates the HD-audio driver:
-------------------------------------------------------------------------
- % hda-emu codecs/stac9200-dell-d820-laptop
- # Parsing..
- hda_codec: Unknown model for STAC9200, using BIOS defaults
- hda_codec: pin nid 08 bios pin config 40c003fa
- ....
-------------------------------------------------------------------------
+::
+
+ % hda-emu codecs/stac9200-dell-d820-laptop
+ # Parsing..
+ hda_codec: Unknown model for STAC9200, using BIOS defaults
+ hda_codec: pin nid 08 bios pin config 40c003fa
+ ....
+
The program gives you only a very dumb command-line interface. You
can get a proc-file dump at the current state, get a list of control
@@ -832,14 +860,14 @@ operation, the jack plugging simulation, etc.
The program is found in the git repository below:
-- git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/hda-emu.git
+* git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/hda-emu.git
See README file in the repository for more details about hda-emu
program.
hda-jack-retask
-~~~~~~~~~~~~~~~
+---------------
hda-jack-retask is a user-friendly GUI program to manipulate the
HD-audio pin control for jack retasking. If you have a problem about
the jack assignment, try this program and check whether you can get
@@ -849,5 +877,4 @@ firmware patch file (see "Early Patching" section).
The program is included in alsa-tools now:
-- git://git.alsa-project.org/alsa-tools.git
-
+* git://git.alsa-project.org/alsa-tools.git
diff --git a/Documentation/sound/index.rst b/Documentation/sound/index.rst
index 280a57115f00..e9bac7c8b893 100644
--- a/Documentation/sound/index.rst
+++ b/Documentation/sound/index.rst
@@ -6,6 +6,7 @@ Linux Sound Subsystem Documentation
:maxdepth: 2
kernel-api/index
+ hd-audio/index
.. only:: subproject
--
2.10.2
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