The existing SoundWire support misses a clear Controller/Manager hiearchical definition to deal with all variants across SOC vendors.

a) Intel platforms have one controller with 4 or more Managers. b) AMD platforms have two controllers with one Manager each, but due to BIOS issues use two different link_id values within the scope of a single controller. c) QCOM platforms have one or more controller with one Manager each.

This patch adds a 'controller_id' which can be set by higher levels. If assigned to -1, the controller_id will be set to the system-unique IDA-assigned bus->id.

The main change is that the bus->id is no longer used for any device name, which makes the definition completely predictable and not dependent on any enumeration order. The bus->id is only used to insert the Managers in the stream rt context.

Reviewed-by: Bard Liao yung-chuan.liao@linux.intel.com Reviewed-by: Vijendar Mukunda Vijendar.Mukunda@amd.com Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com --- drivers/soundwire/amd_manager.c | 8 ++++++++ drivers/soundwire/bus.c | 4 ++++ drivers/soundwire/debugfs.c | 2 +- drivers/soundwire/intel_auxdevice.c | 3 +++ drivers/soundwire/master.c | 2 +- drivers/soundwire/qcom.c | 3 +++ include/linux/soundwire/sdw.h | 4 +++- 7 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/soundwire/amd_manager.c b/drivers/soundwire/amd_manager.c index 3a99f6dcdfaf..a3b1f4e6f0f9 100644 --- a/drivers/soundwire/amd_manager.c +++ b/drivers/soundwire/amd_manager.c @@ -927,6 +927,14 @@ static int amd_sdw_manager_probe(struct platform_device *pdev) amd_manager->bus.clk_stop_timeout = 200; amd_manager->bus.link_id = amd_manager->instance;

+ /* + * Due to BIOS compatibility, the two links are exposed within + * the scope of a single controller. If this changes, the + * controller_id will have to be updated with drv_data + * information. + */ + amd_manager->bus.controller_id = 0; + switch (amd_manager->instance) { case ACP_SDW0: amd_manager->num_dout_ports = AMD_SDW0_MAX_TX_PORTS; diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index 1720031f35a3..025d3df32bd0 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -22,6 +22,10 @@ static int sdw_get_id(struct sdw_bus *bus) return rc;

bus->id = rc; + + if (bus->controller_id == -1) + bus->controller_id = rc; + return 0; }

diff --git a/drivers/soundwire/debugfs.c b/drivers/soundwire/debugfs.c index d1553cb77187..67abd7e52f09 100644 --- a/drivers/soundwire/debugfs.c +++ b/drivers/soundwire/debugfs.c @@ -20,7 +20,7 @@ void sdw_bus_debugfs_init(struct sdw_bus *bus) return;

/* create the debugfs master-N */ - snprintf(name, sizeof(name), "master-%d-%d", bus->id, bus->link_id); + snprintf(name, sizeof(name), "master-%d-%d", bus->controller_id, bus->link_id); bus->debugfs = debugfs_create_dir(name, sdw_debugfs_root); }

diff --git a/drivers/soundwire/intel_auxdevice.c b/drivers/soundwire/intel_auxdevice.c index 7f15e3549e53..93698532deac 100644 --- a/drivers/soundwire/intel_auxdevice.c +++ b/drivers/soundwire/intel_auxdevice.c @@ -234,6 +234,9 @@ static int intel_link_probe(struct auxiliary_device *auxdev, cdns->instance = sdw->instance; cdns->msg_count = 0;

+ /* single controller for all SoundWire links */ + bus->controller_id = 0; + bus->link_id = auxdev->id; bus->clk_stop_timeout = 1;

diff --git a/drivers/soundwire/master.c b/drivers/soundwire/master.c index 9b05c9e25ebe..51abedbbaa66 100644 --- a/drivers/soundwire/master.c +++ b/drivers/soundwire/master.c @@ -145,7 +145,7 @@ int sdw_master_device_add(struct sdw_bus *bus, struct device *parent, md->dev.fwnode = fwnode; md->dev.dma_mask = parent->dma_mask;

- dev_set_name(&md->dev, "sdw-master-%d", bus->id); + dev_set_name(&md->dev, "sdw-master-%d-%d", bus->controller_id, bus->link_id);

ret = device_register(&md->dev); if (ret) { diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c index 55be9f4b8d59..e3ae4e4e07ac 100644 --- a/drivers/soundwire/qcom.c +++ b/drivers/soundwire/qcom.c @@ -1612,6 +1612,9 @@ static int qcom_swrm_probe(struct platform_device *pdev) } }

+ /* FIXME: is there a DT-defined value to use ? */ + ctrl->bus.controller_id = -1; + ret = sdw_bus_master_add(&ctrl->bus, dev, dev->fwnode); if (ret) { dev_err(dev, "Failed to register Soundwire controller (%d)\n", diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h index 4f3d14bb1538..c383579a008b 100644 --- a/include/linux/soundwire/sdw.h +++ b/include/linux/soundwire/sdw.h @@ -886,7 +886,8 @@ struct sdw_master_ops { * struct sdw_bus - SoundWire bus * @dev: Shortcut to &bus->md->dev to avoid changing the entire code. * @md: Master device - * @link_id: Link id number, can be 0 to N, unique for each Master + * @controller_id: system-unique controller ID. If set to -1, the bus @id will be used. + * @link_id: Link id number, can be 0 to N, unique for each Controller * @id: bus system-wide unique id * @slaves: list of Slaves on this bus * @assigned: Bitmap for Slave device numbers. @@ -918,6 +919,7 @@ struct sdw_master_ops { struct sdw_bus { struct device *dev; struct sdw_master_device *md; + int controller_id; unsigned int link_id; int id; struct list_head slaves;