Add support for suspend to RAM by re-aranging the lines in switch..case
from mchp_pdmc_trigger() and saving/restoring the enabled interrupts. These
are necessary as AT91 devices has a special power saving mode (called
backup and self-refresh) where most of the SoC parts are powered off
and thus we need to reconfigure the PDMC on resume.
Signed-off-by: Claudiu Beznea <claudiu.beznea@xxxxxxxxxxxxx>
---
sound/soc/atmel/mchp-pdmc.c | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)
diff --git a/sound/soc/atmel/mchp-pdmc.c b/sound/soc/atmel/mchp-pdmc.c
index f184404e74e5..cf4084dcbd5e 100644
--- a/sound/soc/atmel/mchp-pdmc.c
+++ b/sound/soc/atmel/mchp-pdmc.c
@@ -113,6 +113,7 @@ struct mchp_pdmc {
struct clk *pclk;
struct clk *gclk;
u32 pdmcen;
+ u32 suspend_irq;
int mic_no;
int sinc_order;
bool audio_filter_en;
@@ -641,22 +642,27 @@ static int mchp_pdmc_trigger(struct snd_pcm_substream *substream,
#endif
switch (cmd) {
- case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
- case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ case SNDRV_PCM_TRIGGER_START:
/* Enable overrun and underrun error interrupts */
- regmap_write(dd->regmap, MCHP_PDMC_IER,
+ regmap_write(dd->regmap, MCHP_PDMC_IER, dd->suspend_irq |
MCHP_PDMC_IR_RXOVR | MCHP_PDMC_IR_RXUDR);
+ dd->suspend_irq = 0;
+ fallthrough;
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
snd_soc_component_update_bits(cpu, MCHP_PDMC_MR,
MCHP_PDMC_MR_PDMCEN_MASK,
dd->pdmcen);
break;
- case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
- case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ regmap_read(dd->regmap, MCHP_PDMC_IMR, &dd->suspend_irq);
+ fallthrough;
+ case SNDRV_PCM_TRIGGER_STOP:
/* Disable overrun and underrun error interrupts */
- regmap_write(dd->regmap, MCHP_PDMC_IDR,
+ regmap_write(dd->regmap, MCHP_PDMC_IDR, dd->suspend_irq |
MCHP_PDMC_IR_RXOVR | MCHP_PDMC_IR_RXUDR);
+ fallthrough;
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
snd_soc_component_update_bits(cpu, MCHP_PDMC_MR,
MCHP_PDMC_MR_PDMCEN_MASK, 0);
break;
@@ -1107,6 +1113,7 @@ static const struct of_device_id mchp_pdmc_of_match[] = {
MODULE_DEVICE_TABLE(of, mchp_pdmc_of_match);
static const struct dev_pm_ops mchp_pdmc_pm_ops = {
+ SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume)
RUNTIME_PM_OPS(mchp_pdmc_runtime_suspend, mchp_pdmc_runtime_resume,
NULL)
};
--
2.34.1
