2015-02-18 04:46:37 +08:00
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config SND_HDA_CORE
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tristate
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ALSA: hda - Add regmap support
This patch adds an infrastructure to support regmap-based verb
accesses. Because o the asymmetric nature of HD-audio verbs,
especially the amp verbs, we need to translate the verbs as a sort of
pseudo registers to be mapped uniquely in regmap.
In this patch, a pseudo register is built from the NID, the
AC_VERB_GET_* and 8bit parameters, i.e. almost in the form to be sent
to HD-audio bus but without codec address field. OTOH, for writing,
the same pseudo register is translated to AC_VERB_SET_* automatically.
The AC_VERB_SET_AMP_* verb is re-encoded from the corresponding
AC_VERB_GET_AMP_* verb and parameter at writing.
Some verbs has a single command for read but multiple for writes. A
write for such a verb is split automatically to multiple verbs.
The patch provides also a few handy helper functions. They are
designed to be accessible even without regmap. When no regmap is set
up (e.g. before the codec device instantiation), the direct hardware
access is used. Also, it tries to avoid the unnecessary power-up.
The power up/down sequence is performed only on demand.
The codec driver needs to call snd_hdac_regmap_exit() and
snd_hdac_regmap_exit() at probe and remove if it wants the regmap
access.
There is one flag added to hdac_device. When the flag lazy_cache is
set, regmap helper ignores a write for a suspended device and returns
as if it was actually written. It reduces the hardware access pretty
much, e.g. when adjusting the mixer volume while in idle. This
assumes that the driver will sync the cache later at resume properly,
so use it carefully.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2015-02-25 21:42:38 +08:00
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select REGMAP
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2015-04-14 18:53:28 +08:00
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config SND_HDA_DSP_LOADER
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bool
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2015-05-19 22:29:30 +08:00
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config SND_HDA_I915
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bool
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default y
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depends on DRM_I915
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depends on SND_HDA_CORE
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2015-06-11 16:41:47 +08:00
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config SND_HDA_EXT_CORE
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tristate
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select SND_HDA_CORE
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2015-06-16 23:30:22 +08:00
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config SND_HDA_PREALLOC_SIZE
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int "Pre-allocated buffer size for HD-audio driver"
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range 0 32768
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default 64
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help
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Specifies the default pre-allocated buffer-size in kB for the
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HD-audio driver. A larger buffer (e.g. 2048) is preferred
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for systems using PulseAudio. The default 64 is chosen just
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for compatibility reasons.
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Note that the pre-allocation size can be changed dynamically
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via a proc file (/proc/asound/card*/pcm*/sub*/prealloc), too.
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