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ASoC: SOF: Add support for on-demand DSP boot

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On system suspend / resume we always power up the DSP and boot the
firmware, which is not strictly needed as right after the firmware booted
up we power the DSP down again on suspend and we also power it down after
resume after some inactivity.

Out of caution, add a new platform descriptor flag to enable on-demand
DSP boot since this might not work without changes to platform code on
certain platforms.

With the on-demand dsp boot enabled we will not boot the DSP and firmware
up on system or rpm resume, just enable audio subsystem since audio IPs,
like HDA and SoundWire might be needed (codecs suspend/resume operation).
Only boot up the DSP during the first hw_params() call when the DSP is
really going to be needed.

In this way we can handle the audio related use cases:
normal audio use (rpm suspend/resume)
system suspend/resume without active audio
system suspend/resume with active audio
system suspend/resume without active audio, and audio start before the rpm
suspend timeout

Add module option to force the on-demand DSP boot to allow it to be
disabled or enabled without kernel change for testing.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Liam Girdwood <liam.r.girdwood@intel.com>
Link: https://patch.msgid.link/20251215132946.2155-4-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Peter Ujfalusi
2025-12-15 15:29:41 +02:00
committed by Mark Brown
parent 2c77ff200f
commit c3e1549811
10 changed files with 162 additions and 72 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
sound/soc/sof/sof-priv.h
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@@ -580,6 +580,8 @@ struct snd_sof_dev {
wait_queue_head_t boot_wait;
enum sof_fw_state fw_state;
bool first_boot;
/* mutex to protect DSP firmware boot (except initial, probe time boot */
struct mutex dsp_fw_boot_mutex;
/* work queue in case the probe is implemented in two steps */
struct work_struct probe_work;
@@ -703,6 +705,7 @@ int snd_sof_suspend(struct device *dev);
int snd_sof_dsp_power_down_notify(struct snd_sof_dev *sdev);
int snd_sof_prepare(struct device *dev);
void snd_sof_complete(struct device *dev);
int snd_sof_boot_dsp_firmware(struct snd_sof_dev *sdev);
void snd_sof_new_platform_drv(struct snd_sof_dev *sdev);