soundwire: Add compute_params callback

This callback allows masters to compute the bus parameters required.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20190813083550.5877-2-srinivas.kandagatla@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

2 files changed, 12 insertions, 0 deletions

diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
index 8d6c13528b68..0bc1b4dbd14b 100644
--- a/drivers/soundwire/stream.c
+++ b/drivers/soundwire/stream.c
@@ -1485,6 +1485,16 @@ static int _sdw_prepare_stream(struct sdw_stream_runtime *stream)
                 bus->params.bandwidth += m_rt->stream->params.rate *
                         m_rt->ch_count * m_rt->stream->params.bps;
 
+                /* Compute params */
+                if (bus->compute_params) {
+                        ret = bus->compute_params(bus);
+                        if (ret < 0) {
+                                dev_err(bus->dev, "Compute params failed: %d",
+                                        ret);
+                                return ret;
+                        }
+                }
+
                 /* Program params */
                 ret = sdw_program_params(bus);
                 if (ret < 0) {
diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h
index be9fe08d4e9c..9932eabcb581 100644
--- a/include/linux/soundwire/sdw.h
+++ b/include/linux/soundwire/sdw.h
@@ -728,6 +728,7 @@ struct sdw_master_ops {
  * Bit set implies used number, bit clear implies unused number.
  * @bus_lock: bus lock
  * @msg_lock: message lock
+ * @compute_params: points to Bus resource management implementation
  * @ops: Master callback ops
  * @port_ops: Master port callback ops
  * @params: Current bus parameters
@@ -750,6 +751,7 @@ struct sdw_bus {
         DECLARE_BITMAP(assigned, SDW_MAX_DEVICES);
         struct mutex bus_lock;
         struct mutex msg_lock;
+        int (*compute_params)(struct sdw_bus *bus);
         const struct sdw_master_ops *ops;
         const struct sdw_master_port_ops *port_ops;
         struct sdw_bus_params params;