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Claudiu Beznea bbf4ced888 ASoC: mchp-spdifrx: fix controls which rely on rsr register 
[ Upstream commit fa09fa6038 ]

The SPDIFRX block is clocked by 2 clocks: peripheral and generic clocks.
Peripheral clock feeds user interface (registers) and generic clock feeds
the receiver.

To enable the receiver the generic clock needs to be enabled and also the
ENABLE bit of MCHP_SPDIFRX_MR register need to be set.

The signal control exported by mchp-spdifrx driver reports wrong status
when the receiver is disabled. This can happen when requesting the signal
and the capture was not previously started. To solve this the receiver
needs to be enabled (by enabling generic clock and setting ENABLE bit of
MR register) before reading the signal status.

As with this fix there are 2 paths now that need to control the generic
clock and ENABLE bit of SPDIFRX_MR register (one path though controls, one
path though configuration) a mutex has been introduced. We can't rely on
subsystem locking as the controls are protected by
struct snd_card::controls_rwsem semaphore and configuration is protected
by a different lock (embedded in snd_pcm_stream_lock_irq()).

The introduction of mutex is also extended to other controls which rely on
SPDIFRX_RSR.ULOCK bit as it has been discovered experimentally that having
both clocks enabled but not the receiver (through ENABLE bit of SPDIFRX.MR)
leads to inconsistent values of SPDIFRX_RSR.ULOCK. Thus on some controls we
rely on software state (dev->trigger_enabled protected by mutex) to
retrieve proper values.

Fixes: ef265c55c1 ("ASoC: mchp-spdifrx: add driver for SPDIF RX")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20230130120647.638049-2-claudiu.beznea@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2023-03-10 09:28:35 +01:00
arch LoongArch, bpf: Use 4 instructions for function address in JIT 2023-03-10 09:28:23 +01:00
block block: use proper return value from bio_failfast() 2023-03-10 09:27:58 +01:00
certs certs: Fix build error when PKCS#11 URI contains semicolon 2023-01-31 17:53:01 +09:00
crypto crypto: rsa-pkcs1pad - Use akcipher_request_complete 2023-03-10 09:28:18 +01:00
Documentation dt-bindings: display: mediatek: Fix the fallback for mediatek,mt8186-disp-ccorr 2023-03-10 09:28:35 +01:00
drivers spi: dw_bt1: fix MUX_MMIO dependencies 2023-03-10 09:28:35 +01:00
fs erofs: relinquish volume with mutex held 2023-03-10 09:27:57 +01:00
include scsi: ufs: exynos: Fix DMA alignment for PAGE_SIZE != 4096 2023-03-10 09:28:31 +01:00
init Kbuild fixes for v6.2 (3rd) 2023-01-21 10:56:37 -08:00
io_uring io_uring,audit: don't log IORING_OP_MADVISE 2023-03-10 09:27:56 +01:00
ipc Non-MM patches for 6.2-rc1. 2022-12-12 17:28:58 -08:00
kernel bpf: Fix global subprog context argument resolution logic 2023-03-10 09:28:23 +01:00
lib lib/mpi: Fix buffer overrun when SG is too long 2023-03-10 09:28:05 +01:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm Six hotfixes. Five are cc:stable: four for MM, one for nilfs2. Also a 2023-02-17 17:51:40 -08:00
net l2tp: Avoid possible recursive deadlock in l2tp_tunnel_register() 2023-03-10 09:28:24 +01:00
rust rust: print: avoid evaluating arguments in pr_* macros in unsafe blocks 2023-01-16 00:54:35 +01:00
samples ftrace: Export ftrace_free_filter() to modules 2023-01-24 11:20:58 -05:00
scripts bpf_doc: Fix build error with older python versions 2023-03-10 09:28:05 +01:00
security randstruct: disable Clang 15 support 2023-02-25 11:13:30 +01:00
sound ASoC: mchp-spdifrx: fix controls which rely on rsr register 2023-03-10 09:28:35 +01:00
tools sefltests: netdevsim: wait for devlink instance after netns removal 2023-03-10 09:28:25 +01:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt VFIO fixes for v6.2-rc6 2023-01-23 11:56:07 -08:00
.clang-format iommufd for 6.2 2022-12-14 09:15:43 -08:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore *.rpm 2022-12-30 17:22:14 +09:00
.mailmap 12 hotfixes, mostly against mm/. Five of these fixes are cc:stable. 2023-02-13 14:09:20 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: update SCTP maintainers 2023-02-02 11:35:33 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS audit: update the mailing list in MAINTAINERS 2023-02-25 11:13:29 +01:00
Makefile Linux 6.2.2 2023-03-03 11:56:18 +01:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

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.