linux/sound
Nicolin Chen 3635bf09a8 ASoC: soc-pcm: add symmetry for channels and sample bits
Some SoCs can only work in mono or stereo mode at one time. So if
we let them capture a mono stream while playing a stereo stream,
there might be a problem occur to one of these two streams: double
paced or slowed down.

In soc-pcm.c, we have soc_pcm_apply_symmetry() to apply the rate
symmetry. But we don't have one for channels.

Likewise, we can treat symmetric_rate as a solution for those SoCs
or CODECs which can not handle asymmetrical LRCLK. But it's also
impossible for them to handle asymmetrical BCLK. And accodring to
BCLK = LRCLK * channel number * slot size(fixed or sample bits),
sample bits might also be a problem if they are not using a fixed
slot size.

Thus, this patch applys symmetry for channels and sample bits.

Meanwhile, there might be a race between two substreams if starting
simultaneously. Previously, we only added warning to compalin but
still using conservative way to let it carry on. However, this patch
rejects the second stream with any unmatched parameter to make sure
the first existing stream won't be broken.

Signed-off-by: Nicolin Chen <b42378@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
2013-11-24 13:32:50 +00:00
..
aoa sound fixes for 3.13-rc1 2013-11-16 12:50:53 -08:00
arm Merge branch 'for-linus-dma-masks' of git://git.linaro.org/people/rmk/linux-arm 2013-11-14 07:55:21 +09:00
atmel ALSA: atmel: remove dependency on <mach/gpio.h> 2013-11-05 13:43:25 +01:00
core sound fixes for 3.13-rc1 2013-11-16 12:50:53 -08:00
drivers ALSA: pcsp: Fix the order of input device unregistration 2013-11-14 15:50:10 +01:00
firewire sound fixes #2 for 3.13-rc1 2013-11-22 10:57:31 -08:00
i2c ALSA: ak4114: Fix wrong register array size 2013-10-29 16:42:36 +01:00
isa ALSA: isa: not allocating enough space 2013-11-13 09:28:31 +01:00
mips ALSA: mips/ad1843: Use WARN_ON() instead of BUG_ON() 2013-11-06 08:35:16 +01:00
oss sound: Remove unnecessary semicolons 2013-10-14 11:00:05 +02:00
parisc ALSA: Remove the rest of *_set_drvdata(NULL) calls 2013-05-29 12:50:59 +02:00
pci ALSA: hda - Set current_headset_type to ALC_HEADSET_TYPE_ENUM (janitorial) 2013-11-22 12:58:01 +01:00
pcmcia sound/pcmcia: use module_pcmcia_driver() in pcmcia drivers 2013-03-15 12:26:39 -07:00
ppc Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2013-11-18 15:50:07 -08:00
sh ALSA: sh_dac_audio: Remove redundant platform_set_drvdata() 2013-05-23 14:36:45 +02:00
soc ASoC: soc-pcm: add symmetry for channels and sample bits 2013-11-24 13:32:50 +00:00
sparc ALSA: sparc: fix missing unlock on error in snd_cs4231_playback_prepare() 2013-11-11 16:23:16 +01:00
spi ALSA: Remove the rest of *_set_drvdata(NULL) calls 2013-05-29 12:50:59 +02:00
synth
usb ALSA: usb-audio: add front jack channel selector for EMU0204 2013-11-13 17:05:20 +01:00
ac97_bus.c
Kconfig
last.c
Makefile
sound_core.c consolidate the reassignments of ->f_op in ->open() instances 2013-10-24 23:34:53 -04:00
sound_firmware.c sound_firmware: don't bother with filp_close() 2013-04-09 15:16:32 -04:00