[alsa-devel] [PATCH v4 07/13] soundwire: Add stream configuration APIs
Vinod Koul
vinod.koul at intel.com
Wed Apr 18 12:59:00 CEST 2018
From: Sanyog Kale <sanyog.r.kale at intel.com>
Add APIs for prepare, enable, disable and de-prepare stream.
Signed-off-by: Sanyog Kale <sanyog.r.kale at intel.com>
Signed-off-by: Shreyas NC <shreyas.nc at intel.com>
Signed-off-by: Vinod Koul <vinod.koul at intel.com>
---
drivers/soundwire/bus.c | 9 ++
drivers/soundwire/stream.c | 252 ++++++++++++++++++++++++++++++++++++++++++
include/linux/soundwire/sdw.h | 4 +
3 files changed, 265 insertions(+)
diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index 084bf71b2b87..dcc0ff9f0c22 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -17,6 +17,7 @@
*/
int sdw_add_bus_master(struct sdw_bus *bus)
{
+ struct sdw_master_prop *prop = NULL;
int ret;
if (!bus->dev) {
@@ -79,9 +80,17 @@ int sdw_add_bus_master(struct sdw_bus *bus)
}
/*
+ * Initialize clock values based on Master properties. The max
+ * frequency is read from max_freq property. Current assumption
+ * is that the bus will start at highest clock frequency when
+ * powered on.
+ *
* Default active bank will be 0 as out of reset the Slaves have
* to start with bank 0 (Table 40 of Spec)
*/
+ prop = &bus->prop;
+ bus->params.max_dr_freq = prop->max_freq * SDW_DOUBLE_RATE_FACTOR;
+ bus->params.curr_dr_freq = bus->params.max_dr_freq;
bus->params.curr_bank = SDW_BANK0;
bus->params.next_bank = SDW_BANK1;
diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
index c1bfceee5b73..6664ea83bcee 100644
--- a/drivers/soundwire/stream.c
+++ b/drivers/soundwire/stream.c
@@ -1226,3 +1226,255 @@ struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
return NULL;
}
+
+static int _sdw_prepare_stream(struct sdw_stream_runtime *stream)
+{
+ struct sdw_master_runtime *m_rt = stream->m_rt;
+ struct sdw_bus *bus = m_rt->bus;
+ struct sdw_master_prop *prop = NULL;
+ struct sdw_bus_params params;
+ int ret;
+
+ prop = &bus->prop;
+ memcpy(¶ms, &bus->params, sizeof(params));
+
+ /* TODO: Support Asynchronous mode */
+ if ((prop->max_freq % stream->params.rate) != 0) {
+ dev_err(bus->dev, "Async mode not supported");
+ return -EINVAL;
+ }
+
+ /* Increment cumulative bus bandwidth */
+ bus->params.bandwidth += m_rt->stream->params.rate *
+ m_rt->ch_count * m_rt->stream->params.bps;
+
+ /* Program params */
+ ret = sdw_program_params(bus);
+ if (ret < 0) {
+ dev_err(bus->dev, "Program params failed: %d", ret);
+ goto restore_params;
+ }
+
+ ret = do_bank_switch(stream);
+ if (ret < 0) {
+ dev_err(bus->dev, "Bank switch failed: %d", ret);
+ goto restore_params;
+ }
+
+ /* Prepare port(s) on the new clock configuration */
+ ret = sdw_prep_deprep_ports(m_rt, true);
+ if (ret < 0) {
+ dev_err(bus->dev, "Prepare port(s) failed ret = %d",
+ ret);
+ return ret;
+ }
+
+ stream->state = SDW_STREAM_PREPARED;
+
+ return ret;
+
+restore_params:
+ memcpy(&bus->params, ¶ms, sizeof(params));
+ return ret;
+}
+
+/**
+ * sdw_prepare_stream() - Prepare SoundWire stream
+ *
+ * @stream: Soundwire stream
+ *
+ * Documentation/soundwire/stream.txt explains this API in detail
+ */
+int sdw_prepare_stream(struct sdw_stream_runtime *stream)
+{
+ int ret = 0;
+
+ if (!stream) {
+ pr_err("SoundWire: Handle not found for stream");
+ return -EINVAL;
+ }
+
+ mutex_lock(&stream->m_rt->bus->bus_lock);
+
+ ret = _sdw_prepare_stream(stream);
+ if (ret < 0)
+ pr_err("Prepare for stream:%s failed: %d", stream->name, ret);
+
+ mutex_unlock(&stream->m_rt->bus->bus_lock);
+ return ret;
+}
+EXPORT_SYMBOL(sdw_prepare_stream);
+
+static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
+{
+ struct sdw_master_runtime *m_rt = stream->m_rt;
+ struct sdw_bus *bus = m_rt->bus;
+ int ret;
+
+ /* Program params */
+ ret = sdw_program_params(bus);
+ if (ret < 0) {
+ dev_err(bus->dev, "Program params failed: %d", ret);
+ return ret;
+ }
+
+ /* Enable port(s) */
+ ret = sdw_enable_disable_ports(m_rt, true);
+ if (ret < 0) {
+ dev_err(bus->dev, "Enable port(s) failed ret: %d", ret);
+ return ret;
+ }
+
+ ret = do_bank_switch(stream);
+ if (ret < 0) {
+ dev_err(bus->dev, "Bank switch failed: %d", ret);
+ return ret;
+ }
+
+ stream->state = SDW_STREAM_ENABLED;
+ return 0;
+}
+
+/**
+ * sdw_enable_stream() - Enable SoundWire stream
+ *
+ * @stream: Soundwire stream
+ *
+ * Documentation/soundwire/stream.txt explains this API in detail
+ */
+int sdw_enable_stream(struct sdw_stream_runtime *stream)
+{
+ int ret = 0;
+
+ if (!stream) {
+ pr_err("SoundWire: Handle not found for stream");
+ return -EINVAL;
+ }
+
+ mutex_lock(&stream->m_rt->bus->bus_lock);
+
+ ret = _sdw_enable_stream(stream);
+ if (ret < 0)
+ pr_err("Enable for stream:%s failed: %d", stream->name, ret);
+
+ mutex_unlock(&stream->m_rt->bus->bus_lock);
+ return ret;
+}
+EXPORT_SYMBOL(sdw_enable_stream);
+
+static int _sdw_disable_stream(struct sdw_stream_runtime *stream)
+{
+ struct sdw_master_runtime *m_rt = stream->m_rt;
+ struct sdw_bus *bus = m_rt->bus;
+ int ret;
+
+ /* Disable port(s) */
+ ret = sdw_enable_disable_ports(m_rt, false);
+ if (ret < 0) {
+ dev_err(bus->dev, "Disable port(s) failed: %d", ret);
+ return ret;
+ }
+
+ stream->state = SDW_STREAM_DISABLED;
+
+ /* Program params */
+ ret = sdw_program_params(bus);
+ if (ret < 0) {
+ dev_err(bus->dev, "Program params failed: %d", ret);
+ return ret;
+ }
+
+ return do_bank_switch(stream);
+}
+
+/**
+ * sdw_disable_stream() - Disable SoundWire stream
+ *
+ * @stream: Soundwire stream
+ *
+ * Documentation/soundwire/stream.txt explains this API in detail
+ */
+int sdw_disable_stream(struct sdw_stream_runtime *stream)
+{
+ int ret = 0;
+
+ if (!stream) {
+ pr_err("SoundWire: Handle not found for stream");
+ return -EINVAL;
+ }
+
+ mutex_lock(&stream->m_rt->bus->bus_lock);
+
+ ret = _sdw_disable_stream(stream);
+ if (ret < 0)
+ pr_err("Disable for stream:%s failed: %d", stream->name, ret);
+
+ mutex_unlock(&stream->m_rt->bus->bus_lock);
+ return ret;
+}
+EXPORT_SYMBOL(sdw_disable_stream);
+
+static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream)
+{
+ struct sdw_master_runtime *m_rt = stream->m_rt;
+ struct sdw_bus *bus = m_rt->bus;
+ int ret = 0;
+
+ /* De-prepare port(s) */
+ ret = sdw_prep_deprep_ports(m_rt, false);
+ if (ret < 0) {
+ dev_err(bus->dev, "De-prepare port(s) failed: %d", ret);
+ return ret;
+ }
+
+ bus->params.bandwidth -= m_rt->stream->params.rate *
+ m_rt->ch_count * m_rt->stream->params.bps;
+
+ if (!bus->params.bandwidth) {
+ bus->params.row = 0;
+ bus->params.col = 0;
+ goto exit;
+
+ }
+
+ /* Program params */
+ ret = sdw_program_params(bus);
+ if (ret < 0) {
+ dev_err(bus->dev, "Program params failed: %d", ret);
+ return ret;
+ }
+
+ return do_bank_switch(stream);
+
+exit:
+ stream->state = SDW_STREAM_DEPREPARED;
+
+ return ret;
+}
+
+/**
+ * sdw_deprepare_stream() - Deprepare SoundWire stream
+ *
+ * @stream: Soundwire stream
+ *
+ * Documentation/soundwire/stream.txt explains this API in detail
+ */
+int sdw_deprepare_stream(struct sdw_stream_runtime *stream)
+{
+ int ret = 0;
+
+ if (!stream) {
+ pr_err("SoundWire: Handle not found for stream");
+ return -EINVAL;
+ }
+
+ mutex_lock(&stream->m_rt->bus->bus_lock);
+
+ ret = _sdw_deprepare_stream(stream);
+ if (ret < 0)
+ pr_err("De-prepare for stream:%d failed: %d", ret, ret);
+
+ mutex_unlock(&stream->m_rt->bus->bus_lock);
+ return ret;
+}
+EXPORT_SYMBOL(sdw_deprepare_stream);
diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h
index ff4b0134897e..7cebb7da1a8c 100644
--- a/include/linux/soundwire/sdw.h
+++ b/include/linux/soundwire/sdw.h
@@ -791,6 +791,10 @@ int sdw_stream_remove_master(struct sdw_bus *bus,
struct sdw_stream_runtime *stream);
int sdw_stream_remove_slave(struct sdw_slave *slave,
struct sdw_stream_runtime *stream);
+int sdw_prepare_stream(struct sdw_stream_runtime *stream);
+int sdw_enable_stream(struct sdw_stream_runtime *stream);
+int sdw_disable_stream(struct sdw_stream_runtime *stream);
+int sdw_deprepare_stream(struct sdw_stream_runtime *stream);
/* messaging and data APIs */
--
2.7.4
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