kernel/linux.git/drivers/soundwire/bus.h, branch v7.1

soundwire: introduce BPT section

2025-12-08T07:07:27+00:00

Currently we send a BRA message with a start address with continuous registers in a BPT stream. However, a codec may need to write different register sections shortly. Introduce a register section in struct sdw_btp_msg which contain register start address, length, and buffer. This commit uses only 1 section for each BPT message. And we need to add up all BPT section length and check if it reach maximum BPT bytes. No function changes. Signed-off-by: Bard Liao Reviewed-by: Ranjani Sridharan Tested-by: Shuming Fan Link: https://patch.msgid.link/20251021094355.132943-2-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul

soundwire: bus: add send_async/wait APIs for BPT protocol

2025-03-10T07:01:18+00:00

Add definitions and helpers for the BPT/BRA protocol. Peripheral drivers (aka ASoC codec drivers) can use this API to send bulk data such as firmware or tables. The design intent is however NOT to directly use this API but to rely on an intermediate regmap layer. The API is only available when no other audio streams have been allocated, and only one BTP/BRA stream is allowed per link. To avoid the addition of yet another lock, the refcount tests are handled in the stream master_runtime alloc/free routines where the bus_lock is already held. Another benefit of this approach is that the same bus_lock is used to handle runtime and port linked lists, which reduces the potential for misaligned configurations. In addition to exclusion with audio streams, BPT transfers have a lot of overhead, specifically registers writes are needed to enable transport in DP0. Most DMAs don't handle too well very small data sets and they may have alignment limitations. The size and alignment requirements are for now not handled by the core but must be checked by platform-specific drivers. Signed-off-by: Pierre-Louis Bossart Signed-off-by: Bard Liao Reviewed-by: Péter Ujfalusi Reviewed-by: Liam Girdwood Reviewed-by: Ranjani Sridharan Tested-by: shumingf@realtek.com Link: https://lore.kernel.org/r/20250227140615.8147-8-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul

soundwire: generic_bandwidth_allocation: add lane in sdw_group_params

2024-12-23T06:30:34+00:00

All active streams with the same parameters are grouped together and the params are stored in the sdw_group struct. We compute the required bandwidth for each group. However, each lane has individual bandwidth. Therefore, we should separate different lanes in different params groups. Add lane variable to separate params groups. Signed-off-by: Bard Liao Reviewed-by: Ranjani Sridharan Link: https://lore.kernel.org/r/20241218080155.102405-13-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul

soundwire: add lane field in sdw_port_runtime

2024-12-23T06:30:32+00:00

Currently, lane_ctrl is always 0. Add a lane field in sdw_port_runtime to indicate the data lane of the data port. They are 0 by default. Signed-off-by: Bard Liao Link: https://lore.kernel.org/r/20241218080155.102405-2-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul

soundwire: export sdw_compute_slave_ports() function

2023-04-12T10:00:35+00:00

Export sdw_compute_slave_ports() function to use it in another soundwire manager module. Move sdw_transport_data structure to bus header file to export sdw_compute_slave_ports() function. Signed-off-by: Vijendar Mukunda Reviewed-by: Pierre-Louis Bossart Link: https://lore.kernel.org/lkml/20230201165944.3169125-1-Vijendar.Mukunda@amd.com Link: https://lore.kernel.org/r/20230321050901.115439-2-Vijendar.Mukunda@amd.com Signed-off-by: Vinod Koul

soundwire: bandwidth allocation: Use hweight32() to calculate set bits

2023-04-12T10:00:35+00:00

Replace the call to sdw_ch_mask_to_ch() with a call to hweight32(). sdw_ch_mask_to_ch() is counting the number of set bits. The hweight() family of functions already do this, and they have an advantage of using a bit-counting instruction if it is available on the target CPU. This also fixes a potential infinite loop bug in the implementation of sdw_ch_mask_to_ch(). Signed-off-by: Richard Fitzgerald Link: https://lore.kernel.org/r/20230315145051.2299822-1-rf@opensource.cirrus.com Signed-off-by: Vinod Koul

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