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soundwire: bus: update multi-link definition with hw sync details

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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>
This commit is contained in:
Pierre-Louis Bossart 2020-09-01 23:05:51 +08:00 committed by Vinod Koul
parent d78071b4e1
commit 88d7c71ea5
1 changed files with 6 additions and 0 deletions
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6
include/linux/soundwire/sdw.h
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@ -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,