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authorShreyas NC <shreyas.nc@intel.com>2018-07-27 12:14:16 +0300
committerVinod Koul <vkoul@kernel.org>2018-08-27 07:19:48 +0300
commitce6e74d008ff5c8b43e3bafaa7343bf7eb69593e (patch)
tree88194f56809b4631aba7cb4e7bfbb8a4b20c8afc /drivers/soundwire
parent48949722ced4daacfa32f13c221f173b87231ead (diff)
downloadlinux-ce6e74d008ff5c8b43e3bafaa7343bf7eb69593e.tar.xz
soundwire: Add support for multi link bank switch
In cases of multiple Masters in a stream, synchronization between multiple Master(s) is achieved by performing bank switch together and using Master methods. Add sdw_ml_bank_switch() to wait for completion of bank switch. Signed-off-by: Sanyog Kale <sanyog.r.kale@intel.com> Signed-off-by: Shreyas NC <shreyas.nc@intel.com> Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/soundwire')
-rw-r--r--drivers/soundwire/bus.c5
-rw-r--r--drivers/soundwire/bus.h2
-rw-r--r--drivers/soundwire/stream.c145
3 files changed, 140 insertions, 12 deletions
diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index dbabd5e69343..1cbfedfc20ef 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -35,6 +35,11 @@ int sdw_add_bus_master(struct sdw_bus *bus)
INIT_LIST_HEAD(&bus->slaves);
INIT_LIST_HEAD(&bus->m_rt_list);
+ /*
+ * Initialize multi_link flag
+ * TODO: populate this flag by reading property from FW node
+ */
+ bus->multi_link = false;
if (bus->ops->read_prop) {
ret = bus->ops->read_prop(bus);
if (ret < 0) {
diff --git a/drivers/soundwire/bus.h b/drivers/soundwire/bus.h
index b6cfbdfc47d5..c77de05b8100 100644
--- a/drivers/soundwire/bus.h
+++ b/drivers/soundwire/bus.h
@@ -4,6 +4,8 @@
#ifndef __SDW_BUS_H
#define __SDW_BUS_H
+#define DEFAULT_BANK_SWITCH_TIMEOUT 3000
+
#if IS_ENABLED(CONFIG_ACPI)
int sdw_acpi_find_slaves(struct sdw_bus *bus);
#else
diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
index ee024d72dd7b..3d98f20cbd6a 100644
--- a/drivers/soundwire/stream.c
+++ b/drivers/soundwire/stream.c
@@ -626,9 +626,10 @@ static int sdw_program_params(struct sdw_bus *bus)
return ret;
}
-static int sdw_bank_switch(struct sdw_bus *bus)
+static int sdw_bank_switch(struct sdw_bus *bus, int m_rt_count)
{
int col_index, row_index;
+ bool multi_link;
struct sdw_msg *wr_msg;
u8 *wbuf = NULL;
int ret = 0;
@@ -638,6 +639,8 @@ static int sdw_bank_switch(struct sdw_bus *bus)
if (!wr_msg)
return -ENOMEM;
+ bus->defer_msg.msg = wr_msg;
+
wbuf = kzalloc(sizeof(*wbuf), GFP_KERNEL);
if (!wbuf) {
ret = -ENOMEM;
@@ -658,17 +661,29 @@ static int sdw_bank_switch(struct sdw_bus *bus)
SDW_MSG_FLAG_WRITE, wbuf);
wr_msg->ssp_sync = true;
- ret = sdw_transfer(bus, wr_msg);
+ /*
+ * Set the multi_link flag only when both the hardware supports
+ * and there is a stream handled by multiple masters
+ */
+ multi_link = bus->multi_link && (m_rt_count > 1);
+
+ if (multi_link)
+ ret = sdw_transfer_defer(bus, wr_msg, &bus->defer_msg);
+ else
+ ret = sdw_transfer(bus, wr_msg);
+
if (ret < 0) {
dev_err(bus->dev, "Slave frame_ctrl reg write failed");
goto error;
}
- kfree(wr_msg);
- kfree(wbuf);
- bus->defer_msg.msg = NULL;
- bus->params.curr_bank = !bus->params.curr_bank;
- bus->params.next_bank = !bus->params.next_bank;
+ if (!multi_link) {
+ kfree(wr_msg);
+ kfree(wbuf);
+ bus->defer_msg.msg = NULL;
+ bus->params.curr_bank = !bus->params.curr_bank;
+ bus->params.next_bank = !bus->params.next_bank;
+ }
return 0;
@@ -679,36 +694,87 @@ error_1:
return ret;
}
+/**
+ * sdw_ml_sync_bank_switch: Multilink register bank switch
+ *
+ * @bus: SDW bus instance
+ *
+ * Caller function should free the buffers on error
+ */
+static int sdw_ml_sync_bank_switch(struct sdw_bus *bus)
+{
+ unsigned long time_left;
+
+ if (!bus->multi_link)
+ return 0;
+
+ /* Wait for completion of transfer */
+ time_left = wait_for_completion_timeout(&bus->defer_msg.complete,
+ bus->bank_switch_timeout);
+
+ if (!time_left) {
+ dev_err(bus->dev, "Controller Timed out on bank switch");
+ return -ETIMEDOUT;
+ }
+
+ bus->params.curr_bank = !bus->params.curr_bank;
+ bus->params.next_bank = !bus->params.next_bank;
+
+ if (bus->defer_msg.msg) {
+ kfree(bus->defer_msg.msg->buf);
+ kfree(bus->defer_msg.msg);
+ }
+
+ return 0;
+}
+
static int do_bank_switch(struct sdw_stream_runtime *stream)
{
struct sdw_master_runtime *m_rt = NULL;
const struct sdw_master_ops *ops;
struct sdw_bus *bus = NULL;
+ bool multi_link = false;
int ret = 0;
-
list_for_each_entry(m_rt, &stream->master_list, stream_node) {
bus = m_rt->bus;
ops = bus->ops;
+ if (bus->multi_link) {
+ multi_link = true;
+ mutex_lock(&bus->msg_lock);
+ }
+
/* Pre-bank switch */
if (ops->pre_bank_switch) {
ret = ops->pre_bank_switch(bus);
if (ret < 0) {
dev_err(bus->dev,
"Pre bank switch op failed: %d", ret);
- return ret;
+ goto msg_unlock;
}
}
- /* Bank switch */
- ret = sdw_bank_switch(bus);
+ /*
+ * Perform Bank switch operation.
+ * For multi link cases, the actual bank switch is
+ * synchronized across all Masters and happens later as a
+ * part of post_bank_switch ops.
+ */
+ ret = sdw_bank_switch(bus, stream->m_rt_count);
if (ret < 0) {
dev_err(bus->dev, "Bank switch failed: %d", ret);
- return ret;
+ goto error;
+
}
}
+ /*
+ * For multi link cases, it is expected that the bank switch is
+ * triggered by the post_bank_switch for the first Master in the list
+ * and for the other Masters the post_bank_switch() should return doing
+ * nothing.
+ */
list_for_each_entry(m_rt, &stream->master_list, stream_node) {
bus = m_rt->bus;
ops = bus->ops;
@@ -719,7 +785,47 @@ static int do_bank_switch(struct sdw_stream_runtime *stream)
if (ret < 0) {
dev_err(bus->dev,
"Post bank switch op failed: %d", ret);
+ goto error;
}
+ } else if (bus->multi_link && stream->m_rt_count > 1) {
+ dev_err(bus->dev,
+ "Post bank switch ops not implemented");
+ goto error;
+ }
+
+ /* Set the bank switch timeout to default, if not set */
+ if (!bus->bank_switch_timeout)
+ bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT;
+
+ /* Check if bank switch was successful */
+ ret = sdw_ml_sync_bank_switch(bus);
+ if (ret < 0) {
+ dev_err(bus->dev,
+ "multi link bank switch failed: %d", ret);
+ goto error;
+ }
+
+ mutex_unlock(&bus->msg_lock);
+ }
+
+ return ret;
+
+error:
+ list_for_each_entry(m_rt, &stream->master_list, stream_node) {
+
+ bus = m_rt->bus;
+
+ kfree(bus->defer_msg.msg->buf);
+ kfree(bus->defer_msg.msg);
+ }
+
+msg_unlock:
+
+ if (multi_link) {
+ list_for_each_entry(m_rt, &stream->master_list, stream_node) {
+ bus = m_rt->bus;
+ if (mutex_is_locked(&bus->msg_lock))
+ mutex_unlock(&bus->msg_lock);
}
}
@@ -964,6 +1070,7 @@ int sdw_stream_remove_master(struct sdw_bus *bus,
sdw_master_port_release(bus, m_rt);
sdw_release_master_stream(m_rt, stream);
+ stream->m_rt_count--;
}
if (list_empty(&stream->master_list))
@@ -1150,6 +1257,18 @@ int sdw_stream_add_master(struct sdw_bus *bus,
mutex_lock(&bus->bus_lock);
+ /*
+ * For multi link streams, add the second master only if
+ * the bus supports it.
+ * Check if bus->multi_link is set
+ */
+ if (!bus->multi_link && stream->m_rt_count > 0) {
+ dev_err(bus->dev,
+ "Multilink not supported, link %d", bus->link_id);
+ ret = -EINVAL;
+ goto unlock;
+ }
+
m_rt = sdw_alloc_master_rt(bus, stream_config, stream);
if (!m_rt) {
dev_err(bus->dev,
@@ -1167,6 +1286,8 @@ int sdw_stream_add_master(struct sdw_bus *bus,
if (ret)
goto stream_error;
+ stream->m_rt_count++;
+
goto unlock;
stream_error: