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| author | Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> | 2020-09-01 18:05:51 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2020-09-03 13:44:39 +0300 |
| commit | 88d7c71ea5b29b322d9c72103a196234cb5040db (patch) | |
| tree | 1bb290c180c7f7e16301f2afc865e2db30b44d69 /include/linux/soundwire/sdw.h | |
| parent | d78071b4e1c3252fdceeb1402eb2541649a97206 (diff) | |
| download | linux-88d7c71ea5b29b322d9c72103a196234cb5040db.tar.xz | |
soundwire: bus: update multi-link definition with hw sync details
Hardware-based synchronization is typically required when the
bus->multi_link flag is set.
On Intel platforms, when the Cadence IP is configured in 'Multi Master
Mode', the hardware synchronization is required even when a stream
only uses a single segment. The existing code only deal with hardware
synchronization when a stream uses more than one segment so to remain
backwards compatible we add a configuration threshold. For Intel cases
this threshold will be set to one, other platforms may be able to use
the SSP-based sync in those cases.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20200901150556.19432-6-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'include/linux/soundwire/sdw.h')
| -rw-r--r-- | include/linux/soundwire/sdw.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h index 63e71645fd13..78f52cdeb2c9 100644 --- a/include/linux/soundwire/sdw.h +++ b/include/linux/soundwire/sdw.h @@ -828,6 +828,11 @@ struct sdw_master_ops { * @multi_link: Store bus property that indicates if multi links * are supported. This flag is populated by drivers after reading * appropriate firmware (ACPI/DT). + * @hw_sync_min_links: Number of links used by a stream above which + * hardware-based synchronization is required. This value is only + * meaningful if multi_link is set. If set to 1, hardware-based + * synchronization will be used even if a stream only uses a single + * SoundWire segment. */ struct sdw_bus { struct device *dev; @@ -851,6 +856,7 @@ struct sdw_bus { unsigned int clk_stop_timeout; u32 bank_switch_timeout; bool multi_link; + int hw_sync_min_links; }; int sdw_bus_master_add(struct sdw_bus *bus, struct device *parent, |