ASoC: cs35l56: Support clock stop mode 1 if enabled in ACPI

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Report the ability to support SoundWire clock-stop mode 1 if this is
enabled in ACPI. Mode 1 allows the device to lose state, so it can
reduce power consumption in clock-stop. Also add the necessary
handling to wait for re-enumeration on resume.

This does not use sdw_slave_read_prop(), because that also fills in
other properties from ACPI that were not previously set by the driver
and this has been observed to break some systems. Instead, the
"mipi-sdw-clock-stop-mode1-supported" property is checked directly.

When a SoundWire peripheral has been put into clock-stop mode 1 it
must be re-enumerated after the clock is restarted. A new flag
sdw_in_clock_stop_1 is set to true in cs35l56_sdw_clk_stop() if the
SoundWire core notifies that it is entering clock-stop 1.
cs35l56_sdw_handle_unattach() will wait for re-enumeration if
sdw_in_clock_stop_1 is true.

sdw_in_clock_stop_1 will be reset to false when an ATTACH notification
is received in cs35l56_sdw_update_status().

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://patch.msgid.link/20260311142153.2201761-1-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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Richard Fitzgerald 2026-03-11 14:21:53 +00:00 • committed by Mark Brown

parent 94ef278e74

commit 48863104d2

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sound/soc/codecs/cs35l56-sdw.c

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sound/soc/codecs/cs35l56.h

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