kernel/linux.git/drivers/soundwire/bus.h, branch v6.3

soundwire: bus: remove sdw_defer argument in sdw_transfer_defer()

2023-01-31T14:27:17+00:00

There's no point in passing an argument that is a pointer to a bus member. We can directly get the member and do an indirection when needed. This is a first step before simplifying the hardware-specific callbacks further. Signed-off-by: Pierre-Louis Bossart Reviewed-by: Ranjani Sridharan Signed-off-by: Bard Liao Link: https://lore.kernel.org/r/20230119073211.85979-3-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul

soundwire: export sdw_update() and sdw_update_no_pm()

2021-06-21T12:00:42+00:00

We currently export sdw_read() and sdw_write() but the sdw_update() and sdw_update_no_pm() are currently available only to the bus code. This was missed in an earlier contribution. Export both functions so that codec drivers can perform read-modify-write operations without duplicating the code. Fixes: b04c975e654c ('soundwire: bus: use sdw_update_no_pm when initializing a device') Signed-off-by: Pierre-Louis Bossart Reviewed-by: Bard Liao Reviewed-by: Péter Ujfalusi Acked-By: Vinod Koul Link: https://lore.kernel.org/r/20210614180815.153711-2-pierre-louis.bossart@linux.intel.com Signed-off-by: Mark Brown

soundwire: Intel: introduce DMI quirks for HP Spectre x360 Convertible

2021-03-22T12:03:10+00:00

HP Spectre x360 Convertible devices expose invalid _ADR fields in the DSDT, which prevents codec drivers from probing. A possible solution is to override the DSDT, but that's just too painful for users. This patch suggests a simple DMI-based quirk to remap the existing invalid ADR information into valid ones. BugLink: https://github.com/thesofproject/linux/issues/2700 Co-developed-by: Bard Liao Signed-off-by: Bard Liao Signed-off-by: Pierre-Louis Bossart Reviewed-by: Rander Wang Reviewed-by: Guennadi Liakhovetski Link: https://lore.kernel.org/r/20210302075105.11515-3-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul

soundwire: bus: add enumerated Slave device to device list

2020-09-28T05:47:40+00:00

Currently Slave devices are only added on startup, either from Device Tree or ACPI entries. However Slave devices that are physically present on the bus, but not described in platform firmware, will never be added to the device list. The user/integrator can only know the list of devices by looking a dynamic debug logs. This patch suggests adding a Slave device even if there is no matching DT or ACPI entry, so that we can see this in sysfs entry. Initial code from Srinivas. Comments, fixes for ACPI probe and edits of commit message by Pierre. Signed-off-by: Srinivas Kandagatla Co-developed-by: Pierre-Louis Bossart Signed-off-by: Pierre-Louis Bossart Link: https://lore.kernel.org/r/20200924194430.121058-2-pierre-louis.bossart@linux.intel.com Signed-off-by: Vinod Koul

soundwire: Add generic bandwidth allocation algorithm

2020-09-18T12:18:51+00:00

This algorithm computes bus parameters like clock frequency, frame shape and port transport parameters based on active stream(s) running on the bus. Developers can also implement their own .compute_params() callback for specific resource management algorithm, and set if before calling sdw_add_bus_master() Credits: this patch is based on an earlier internal contribution by Vinod Koul, Sanyog Kale, Shreyas Nc and Hardik Shah. All hard-coded values were removed from the initial contribution to use BIOS information instead. Signed-off-by: Bard Liao Acked-by: Jaroslav Kysela Link: https://lore.kernel.org/r/20200908131520.5712-1-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul

soundwire: bus: export broadcast read/write capability for tests

2020-09-10T05:51:05+00:00

Provide prototype and export symbol to enable tests. The bus lock is handled externally to avoid conflicts e.g. between kernel-generated traffic and test traffic. Signed-off-by: Pierre-Louis Bossart Signed-off-by: Bard Liao Reviewed-by: Kai Vehmanen Reviewed-by: Guennadi Liakhovetski Link: https://lore.kernel.org/r/20200908134521.6781-7-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul

soundwire: add Slave sysfs support

2020-05-20T11:52:41+00:00

Expose MIPI DisCo Slave properties in sysfs. For Slave properties and Data Port 0, the attributes are managed with simple devm_ support. A Slave Device may have more than one Data Port (DPN), and each Data Port can be sink or source. The attributes are created dynamically using pre-canned macros, but still use devm_ with a name attribute group to avoid creating kobjects - as requested by GregKH. In the _show function, we use container_of() to retrieve port number and direction required to extract the information. Audio modes are not supported for now. Depending on the discussions the SoundWire Device Class, we may add it later as is or follow the new specification. Signed-off-by: Pierre-Louis Bossart Signed-off-by: Bard Liao Reviewed-by: Greg Kroah-Hartman Link: https://lore.kernel.org/r/20200518203551.2053-4-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul

soundwire: bus_type: add sdw_master_device support

2020-05-19T07:14:35+00:00

In the existing SoundWire code, Master Devices are not explicitly represented - only SoundWire Slave Devices are exposed (the use of capital letters follows the SoundWire specification conventions). With the existing code, the bus is handled without using a proper device, and bus->dev typically points to a platform device. The right thing to do as discussed in multiple reviews is use a device for each bus. The sdw_master_device addition is done with minimal internal plumbing and not exposed externally. The existing API based on sdw_bus_master_add() and sdw_bus_master_delete() will deal with the sdw_master_device life cycle, which minimizes changes to existing drivers. Note that the Intel code will be modified in follow-up patches (no impact on any platform since the connection with ASoC is not supported upstream so far). Signed-off-by: Pierre-Louis Bossart Signed-off-by: Bard Liao Acked-by: Jaroslav Kysela Link: https://lore.kernel.org/r/20200518174322.31561-5-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul

soundwire: bus: add helper to clear Slave status to UNATTACHED

2020-02-25T10:27:02+00:00

When resuming with a bus reset, we need to re-enumerate and restart from UNATTACHED. The helper added in this patch helps implement a more robust state machine avoiding race conditions on resume. The unattach request is stored and will be used by Slave drivers, if needed: Intel validation exposed a corner case where the Slave device may transition to D3 when streaming stops, but streaming restarts before the Master transitions to D3. In that case, the Slave status was not cleared as UNATTACHED by the Master resuming, and the wait_for_completion will time out. When the slave resumes, it can check if a Master-initiated re-enumeration and initialization took place and skip the wait_for_completion() if there is no reason to wait. Signed-off-by: Pierre-Louis Bossart Link: https://lore.kernel.org/r/20200115000844.14695-7-pierre-louis.bossart@linux.intel.com Signed-off-by: Vinod Koul

soundwire: bus: fix race condition with probe_complete signaling

2020-02-25T10:27:01+00:00

The driver probe takes care of basic initialization and is invoked when a Slave becomes attached, after a match between the Slave DevID registers and ACPI/DT entries. The update_status callback is invoked when a Slave state changes, e.g. when it is assigned a non-zero Device Number and it reports with an ATTACHED/ALERT state. The state change detection is usually hardware-based and based on the SoundWire frame rate (e.g. double-digit microseconds) while the probe is a pure software operation, which may involve a kernel module load. In corner cases, it's possible that the state changes before the probe completes. This patch suggests the use of wait_for_completion to avoid races on startup, so that the update_status callback does not rely on invalid pointers/data structures. Signed-off-by: Rander Wang Signed-off-by: Pierre-Louis Bossart Link: https://lore.kernel.org/r/20200115000844.14695-2-pierre-louis.bossart@linux.intel.com Signed-off-by: Vinod Koul