lkml.org 
[lkml]   [2020]   [Mar]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH 0/2] soundwire: add read_only_wordlength flag
Date
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

\
 
 \ /
  Last update: 2020-03-11 12:37    [W:0.065 / U:1.080 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site