Some parts do not stop the DSP core before runtime suspend, however,
this leaves the DSP controls enabled and accessible whilst the part is
suspended and the regmap is cache_only.

Add new APIs to allow for the DSP to hibernate when the part is
suspended, and the DSP is not shut down.

Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
---
 sound/soc/codecs/wm_adsp.c | 6 ++++++
 sound/soc/codecs/wm_adsp.h | 1 +
 2 files changed, 7 insertions(+)

diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index 2e23848e1dce..d95b54275b5e 100644
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -1100,6 +1100,12 @@ void wm_adsp_stop(struct wm_adsp *dsp)
 }
 EXPORT_SYMBOL_GPL(wm_adsp_stop);
 
+void wm_adsp_hibernate(struct wm_adsp *dsp, bool hibernate)
+{
+	cs_dsp_hibernate(&dsp->cs_dsp, hibernate);
+}
+EXPORT_SYMBOL_GPL(wm_adsp_hibernate);
+
 int wm_adsp_event(struct snd_soc_dapm_widget *w,
 		  struct snd_kcontrol *kcontrol, int event)
 {
diff --git a/sound/soc/codecs/wm_adsp.h b/sound/soc/codecs/wm_adsp.h
index 8035fda71f8d..a9118be793d7 100644
--- a/sound/soc/codecs/wm_adsp.h
+++ b/sound/soc/codecs/wm_adsp.h
@@ -103,6 +103,7 @@ irqreturn_t wm_halo_wdt_expire(int irq, void *data);
 
 int wm_adsp_run(struct wm_adsp *dsp);
 void wm_adsp_stop(struct wm_adsp *dsp);
+void wm_adsp_hibernate(struct wm_adsp *dsp, bool hibernate);
 int wm_adsp_event(struct snd_soc_dapm_widget *w,
 		  struct snd_kcontrol *kcontrol, int event);
 
-- 
2.43.0

On 24/02/2026 4:18 pm, Stefan Binding wrote:
> Some parts do not stop the DSP core before runtime suspend, however,
> this leaves the DSP controls enabled and accessible whilst the part is
> suspended and the regmap is cache_only.
> 
> Add new APIs to allow for the DSP to hibernate when the part is
> suspended, and the DSP is not shut down.
> 
> Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
> ---
>   sound/soc/codecs/wm_adsp.c | 6 ++++++
>   sound/soc/codecs/wm_adsp.h | 1 +
>   2 files changed, 7 insertions(+)

Reviewed-by: Richard Fitzgerald <rf@opensource.cirrus.com>