linux-kernel - [PATCH 0/2] soundwire: add read_only

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Date:   Wed, 11 Mar 2020 11:35:43 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     broonie@...nel.org, vkoul@...nel.org
Cc:     pierre-louis.bossart@...ux.intel.com, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 0/2] soundwire: add read_only_wordlength flag

According to SoundWire Specification Version 1.2.
"A Data Port number X (in the range 0-14) which supports only one
value of WordLength may implement the WordLength field in the
DPX_BlockCtrl1 Register as Read-Only, returning the fixed value of
WordLength in response to reads."

As WSA881x interfaces in PDM mode making the only field "WordLength"
in DPX_BlockCtrl1" fixed and read-only. Behaviour of writing to this
register on WSA881x soundwire slave with Qualcomm Soundwire Controller
is throwing up an error. Not sure how other controllers deal with
writing to readonly registers, but this patch provides a way to avoid
writes to DPN_BlockCtrl1 register by providing a read_only_wordlength
flag in struct sdw_dpn_prop

Srinivas Kandagatla (2):
  soundwire: stream: Add read_only_wordlength flag to port properties
  ASoC: wsa881x: mark read_only_wordlength flag

 drivers/soundwire/stream.c    | 16 +++++++++-------
 include/linux/soundwire/sdw.h |  2 ++
 sound/soc/codecs/wsa881x.c    |  4 ++++
 3 files changed, 15 insertions(+), 7 deletions(-)

-- 
2.21.0