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Katsuhiro Suzuki 2458adb8f9
SoC: simple-card-utils: set 0Hz to sysclk when shutdown 
This patch set 0Hz to sysclk when shutdown the card.

Some codecs set rate constraints that derives from sysclk. This
mechanism works correctly if machine drivers give fixed frequency.

But simple-audio and audio-graph card set variable clock rate if
'mclk-fs' property exists. In this case, rate constraints will go
bad scenario. For example a codec accepts three limited rates
(mclk / 256, mclk / 384, mclk / 512).

Bad scenario as follows (mclk-fs = 256):
   - Initialize sysclk by correct value (Ex. 12.288MHz)
     - Codec set constraints of PCM rate by sysclk
       48kHz (1/256), 32kHz (1/384), 24kHz (1/512)
   - Play 48kHz sound, it's acceptable
   - Sysclk is not changed

   - Play 32kHz sound, it's acceptable
   - Set sysclk to 8.192MHz (= fs * mclk-fs = 32k * 256)
     - Codec set constraints of PCM rate by sysclk
       32kHz (1/256), 21.33kHz (1/384), 16kHz (1/512)

   - Play 48kHz again, but it's NOT acceptable because constraints
     do not allow 48kHz

So codecs treat 0Hz sysclk as signal of applying no constraints to
avoid this problem.

Signed-off-by: Katsuhiro Suzuki <katsuhiro@katsuster.net>
Link: https://lore.kernel.org/r/20190907174501.19833-1-katsuhiro@katsuster.net
Signed-off-by: Mark Brown <broonie@kernel.org>
2019-09-09 10:51:21 +01:00
arch hexagon: switch to generic version of pte allocation 2019-07-21 09:53:00 -07:00
block
certs
crypto
Documentation ASoC: es8316: fix redundant codes of clock 2019-09-09 10:50:21 +01:00
drivers iommu/amd: fix a crash in iova_magazine_free_pfns 2019-07-21 09:57:13 -07:00
fs SMB3 fixes: two fixes for stable, one that had dependency on earlier patch in this merge window and can now go in, and a perf improvement in SMB3 open 2019-07-21 10:01:17 -07:00
include ASoC: soc-core: add snd_soc_dapm_init() 2019-09-02 13:21:20 +01:00
init
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kernel dma-mapping fixes for 5.3-rc1 2019-07-20 12:09:52 -07:00
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sound SoC: simple-card-utils: set 0Hz to sysclk when shutdown 2019-09-09 10:51:21 +01:00
tools New feature to add support for NTB virtual MSI interrupts, the ability 2019-07-21 09:46:59 -07:00
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MAINTAINERS Merge branch 'asoc-5.3' into asoc-5.4 2019-08-20 18:28:43 +01:00
Makefile Linus 5.3-rc1 2019-07-21 14:05:38 -07:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.