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authorSrinivas Kandagatla <srinivas.kandagatla@linaro.org>2020-03-11 14:35:44 +0300
committerVinod Koul <vkoul@kernel.org>2020-03-20 16:54:59 +0300
commita9107de4b03604ce0d279315c91b31b8065ee4ea (patch)
tree4c6fb188e1cb391bcf45ea6d24f509de2cde9823
parentbb6d3fb354c5ee8d6bde2d576eb7220ea09862b9 (diff)
downloadlinux-a9107de4b03604ce0d279315c91b31b8065ee4ea.tar.xz
soundwire: stream: Add read_only_wordlength flag to port properties
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 Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20200311113545.23773-2-srinivas.kandagatla@linaro.org Signed-off-by: Vinod Koul <vkoul@kernel.org>
-rw-r--r--drivers/soundwire/stream.c16
-rw-r--r--include/linux/soundwire/sdw.h2
2 files changed, 11 insertions, 7 deletions
diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
index 178ae92b8cc1..7fb89a94d9c0 100644
--- a/drivers/soundwire/stream.c
+++ b/drivers/soundwire/stream.c
@@ -167,13 +167,15 @@ static int sdw_program_slave_port_params(struct sdw_bus *bus,
return ret;
}
- /* Program DPN_BlockCtrl1 register */
- ret = sdw_write(s_rt->slave, addr2, (p_params->bps - 1));
- if (ret < 0) {
- dev_err(&s_rt->slave->dev,
- "DPN_BlockCtrl1 register write failed for port %d\n",
- t_params->port_num);
- return ret;
+ if (!dpn_prop->read_only_wordlength) {
+ /* Program DPN_BlockCtrl1 register */
+ ret = sdw_write(s_rt->slave, addr2, (p_params->bps - 1));
+ if (ret < 0) {
+ dev_err(&s_rt->slave->dev,
+ "DPN_BlockCtrl1 register write failed for port %d\n",
+ t_params->port_num);
+ return ret;
+ }
}
/* Program DPN_SampleCtrl1 register */
diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h
index b451bb622335..2dfe14ed3bb0 100644
--- a/include/linux/soundwire/sdw.h
+++ b/include/linux/soundwire/sdw.h
@@ -284,6 +284,7 @@ struct sdw_dpn_audio_mode {
* @max_async_buffer: Number of samples that this port can buffer in
* asynchronous modes
* @block_pack_mode: Type of block port mode supported
+ * @read_only_wordlength: Read Only wordlength field in DPN_BlockCtrl1 register
* @port_encoding: Payload Channel Sample encoding schemes supported
* @audio_modes: Audio modes supported
*/
@@ -307,6 +308,7 @@ struct sdw_dpn_prop {
u32 modes;
u32 max_async_buffer;
bool block_pack_mode;
+ bool read_only_wordlength;
u32 port_encoding;
struct sdw_dpn_audio_mode *audio_modes;
};