Merge tag 'soundwire-5.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/soundwire into char-misc-next

Vinod writes:

soundwire updates for v5.6-rc1

This round we have bunch of updates to interfaces for ASoC (audio)
subsystem by Intel and a new Qualcomm controller driver

Details
 - Updates for sdw_slave interfaces for ASoC
 - Updates to cadence library and intel driver
 - New Soundwire controller for Qualcomm masters
 - Rework of device number assignment

* tag 'soundwire-5.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/soundwire: (27 commits)
  dt-bindings: soundwire: fix example
  soundwire: cadence: fix kernel-doc parameter descriptions
  soundwire: intel: report slave_ids for each link to SOF driver
  soundwire: intel: fix factor of two in MCLK handling
  soundwire: bus: fix device number leak on errors
  soundwire: cadence: remove useless variable incrementation
  soundwire: cadence: update kernel-doc parameter descriptions
  soundwire: qcom: add support for SoundWire controller
  dt-bindings: soundwire: add bindings for Qcom controller
  soundwire: bus: check first if Slaves become UNATTACHED
  soundwire: cadence_master: handle multiple status reports per Slave
  soundwire: cadence_master: remove config update for interrupt setting
  soundwire: cadence_master: log more useful information during timeouts
  soundwire: cadence_master: clear interrupt status before enabling interrupt
  soundwire: cadence_master: filter out bad interrupts
  soundwire: stream: remove redundant pr_err traces
  soundwire: intel: add clock stop quirks
  soundwire: intel: add mutex for shared SHIM register access
  soundwire: intel: add prototype for WAKEEN interrupt processing
  soundwire: intel: add link_list to handle interrupts with a single thread
  ...

Author: gregkh

Documentation/devicetree/bindings/soundwire/qcom,sdw.txt

@@ -0,0 +1,167 @@
+Qualcomm SoundWire Controller Bindings
+
+
+This binding describes the Qualcomm SoundWire Controller along with its
+board specific bus parameters.
+
+- compatible:
+	Usage: required
+	Value type: <stringlist>
+	Definition: must be "qcom,soundwire-v<MAJOR>.<MINOR>.<STEP>",
+		    Example:
+			"qcom,soundwire-v1.3.0"
+			"qcom,soundwire-v1.5.0"
+			"qcom,soundwire-v1.6.0"
+- reg:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: the base address and size of SoundWire controller
+		    address space.
+
+- interrupts:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: should specify the SoundWire Controller IRQ
+
+- clock-names:
+	Usage: required
+	Value type: <stringlist>
+	Definition: should be "iface" for SoundWire Controller interface clock
+
+- clocks:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: should specify the SoundWire Controller interface clock
+
+- #sound-dai-cells:
+	Usage: required
+	Value type: <u32>
+	Definition: must be 1 for digital audio interfaces on the controller.
+
+- qcom,dout-ports:
+	Usage: required
+	Value type: <u32>
+	Definition: must be count of data out ports
+
+- qcom,din-ports:
+	Usage: required
+	Value type: <u32>
+	Definition: must be count of data in ports
+
+- qcom,ports-offset1:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: should specify payload transport window offset1 of each
+		    data port. Out ports followed by In ports.
+		    More info in MIPI Alliance SoundWire 1.0 Specifications.
+
+- qcom,ports-offset2:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: should specify payload transport window offset2 of each
+		    data port. Out ports followed by In ports.
+		    More info in MIPI Alliance SoundWire 1.0 Specifications.
+
+- qcom,ports-sinterval-low:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: should be sample interval low of each data port.
+		    Out ports followed by In ports. Used for Sample Interval
+		    calculation.
+		    More info in MIPI Alliance SoundWire 1.0 Specifications.
+
+- qcom,ports-word-length:
+	Usage: optional
+	Value type: <prop-encoded-array>
+	Definition: should be size of payload channel sample.
+		    More info in MIPI Alliance SoundWire 1.0 Specifications.
+
+- qcom,ports-block-pack-mode:
+	Usage: optional
+	Value type: <prop-encoded-array>
+	Definition: should be 0 or 1 to indicate the block packing mode.
+		    0 to indicate Blocks are per Channel
+		    1 to indicate Blocks are per Port.
+		    Out ports followed by In ports.
+		    More info in MIPI Alliance SoundWire 1.0 Specifications.
+
+- qcom,ports-block-group-count:
+	Usage: optional
+	Value type: <prop-encoded-array>
+	Definition: should be in range 1 to 4 to indicate how many sample
+		    intervals are combined into a payload.
+		    Out ports followed by In ports.
+		    More info in MIPI Alliance SoundWire 1.0 Specifications.
+
+- qcom,ports-lane-control:
+	Usage: optional
+	Value type: <prop-encoded-array>
+	Definition: should be in range 0 to 7 to identify which	data lane
+		    the data port uses.
+		    Out ports followed by In ports.
+		    More info in MIPI Alliance SoundWire 1.0 Specifications.
+
+- qcom,ports-hstart:
+	Usage: optional
+	Value type: <prop-encoded-array>
+	Definition: should be number identifying lowerst numbered coloum in
+		    SoundWire Frame, i.e. left edge of the Transport sub-frame
+		    for each port. Values between 0 and 15 are valid.
+		    Out ports followed by In ports.
+		    More info in MIPI Alliance SoundWire 1.0 Specifications.
+
+- qcom,ports-hstop:
+	Usage: optional
+	Value type: <prop-encoded-array>
+	Definition: should be number identifying highest numbered coloum in
+		    SoundWire Frame, i.e. the right edge of the Transport
+		    sub-frame for each port. Values between 0 and 15 are valid.
+		    Out ports followed by In ports.
+		    More info in MIPI Alliance SoundWire 1.0 Specifications.
+
+- qcom,dports-type:
+	Usage: optional
+	Value type: <prop-encoded-array>
+	Definition: should be one of the following types
+		    0 for reduced port
+		    1 for simple ports
+		    2 for full port
+		    Out ports followed by In ports.
+		    More info in MIPI Alliance SoundWire 1.0 Specifications.
+
+Note:
+	More Information on detail of encoding of these fields can be
+found in MIPI Alliance SoundWire 1.0 Specifications.
+
+= SoundWire devices
+Each subnode of the bus represents SoundWire device attached to it.
+The properties of these nodes are defined by the individual bindings.
+
+= EXAMPLE
+The following example represents a SoundWire controller on DB845c board
+which has controller integrated inside WCD934x codec on SDM845 SoC.
+
+soundwire: soundwire@c85 {
+	compatible = "qcom,soundwire-v1.3.0";
+	reg = <0xc85 0x20>;
+	interrupts = <20 IRQ_TYPE_EDGE_RISING>;
+	clocks = <&wcc>;
+	clock-names = "iface";
+	#sound-dai-cells = <1>;
+	qcom,dports-type = <0>;
+	qcom,dout-ports	= <6>;
+	qcom,din-ports	= <2>;
+	qcom,ports-sinterval-low = /bits/ 8  <0x07 0x1F 0x3F 0x7 0x1F 0x3F 0x0F 0x0F>;
+	qcom,ports-offset1 = /bits/ 8 <0x01 0x02 0x0C 0x6 0x12 0x0D 0x07 0x0A >;
+	qcom,ports-offset2 = /bits/ 8 <0x00 0x00 0x1F 0x00 0x00 0x1F 0x00 0x00>;
+
+	/* Left Speaker */
+	left{
+		....
+	};
+
+	/* Right Speaker */
+	right{
+		....
+	};
+};

Documentation/devicetree/bindings/soundwire/soundwire-controller.yaml

@@ -69,13 +69,15 @@ examples:
             reg = <0 1>;
             powerdown-gpios = <&wcdpinctrl 2 0>;
             #thermal-sensor-cells = <0>;
+            #sound-dai-cells = <0>;
         };
 
         speaker@0,2 {
             compatible = "sdw10217201000";
             reg = <0 2>;
             powerdown-gpios = <&wcdpinctrl 2 0>;
             #thermal-sensor-cells = <0>;
+            #sound-dai-cells = <0>;
         };
     };
 

drivers/soundwire/Kconfig

@@ -31,4 +31,13 @@ config SOUNDWIRE_INTEL
 	  enable this config option to get the SoundWire support for that
 	  device.
 
+config SOUNDWIRE_QCOM
+	tristate "Qualcomm SoundWire Master driver"
+	depends on SLIMBUS
+	depends on SND_SOC
+	help
+	  SoundWire Qualcomm Master driver.
+	  If you have an Qualcomm platform which has a SoundWire Master then
+	  enable this config option to get the SoundWire support for that
+	  device
 endif

drivers/soundwire/Makefile

@@ -21,3 +21,7 @@ obj-$(CONFIG_SOUNDWIRE_INTEL) += soundwire-intel.o
 
 soundwire-intel-init-objs := intel_init.o
 obj-$(CONFIG_SOUNDWIRE_INTEL) += soundwire-intel-init.o
+
+#Qualcomm driver
+soundwire-qcom-objs :=	qcom.o
+obj-$(CONFIG_SOUNDWIRE_QCOM) += soundwire-qcom.o

drivers/soundwire/bus.c

@@ -456,26 +456,35 @@ static int sdw_get_device_num(struct sdw_slave *slave)
 static int sdw_assign_device_num(struct sdw_slave *slave)
 {
 	int ret, dev_num;
+	bool new_device = false;
 
 	/* check first if device number is assigned, if so reuse that */
 	if (!slave->dev_num) {
-		mutex_lock(&slave->bus->bus_lock);
-		dev_num = sdw_get_device_num(slave);
-		mutex_unlock(&slave->bus->bus_lock);
-		if (dev_num < 0) {
-			dev_err(slave->bus->dev, "Get dev_num failed: %d\n",
-				dev_num);
-			return dev_num;
+		if (!slave->dev_num_sticky) {
+			mutex_lock(&slave->bus->bus_lock);
+			dev_num = sdw_get_device_num(slave);
+			mutex_unlock(&slave->bus->bus_lock);
+			if (dev_num < 0) {
+				dev_err(slave->bus->dev, "Get dev_num failed: %d\n",
+					dev_num);
+				return dev_num;
+			}
+			slave->dev_num = dev_num;
+			slave->dev_num_sticky = dev_num;
+			new_device = true;
+		} else {
+			slave->dev_num = slave->dev_num_sticky;
 		}
-	} else {
+	}
+
+	if (!new_device)
 		dev_info(slave->bus->dev,
-			 "Slave already registered dev_num:%d\n",
+			 "Slave already registered, reusing dev_num:%d\n",
 			 slave->dev_num);
 
-		/* Clear the slave->dev_num to transfer message on device 0 */
-		dev_num = slave->dev_num;
-		slave->dev_num = 0;
-	}
+	/* Clear the slave->dev_num to transfer message on device 0 */
+	dev_num = slave->dev_num;
+	slave->dev_num = 0;
 
 	ret = sdw_write(slave, SDW_SCP_DEVNUMBER, dev_num);
 	if (ret < 0) {
@@ -485,7 +494,7 @@ static int sdw_assign_device_num(struct sdw_slave *slave)
 	}
 
 	/* After xfer of msg, restore dev_num */
-	slave->dev_num = dev_num;
+	slave->dev_num = slave->dev_num_sticky;
 
 	return 0;
 }
@@ -979,6 +988,24 @@ int sdw_handle_slave_status(struct sdw_bus *bus,
 	struct sdw_slave *slave;
 	int i, ret = 0;
 
+	/* first check if any Slaves fell off the bus */
+	for (i = 1; i <= SDW_MAX_DEVICES; i++) {
+		mutex_lock(&bus->bus_lock);
+		if (test_bit(i, bus->assigned) == false) {
+			mutex_unlock(&bus->bus_lock);
+			continue;
+		}
+		mutex_unlock(&bus->bus_lock);
+
+		slave = sdw_get_slave(bus, i);
+		if (!slave)
+			continue;
+
+		if (status[i] == SDW_SLAVE_UNATTACHED &&
+		    slave->status != SDW_SLAVE_UNATTACHED)
+			sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
+	}
+
 	if (status[0] == SDW_SLAVE_ATTACHED) {
 		dev_dbg(bus->dev, "Slave attached, programming device number\n");
 		ret = sdw_program_device_num(bus);