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ASoC: mchp-pdmc: add support for suspend to RAM

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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@microchip.com>
Link: https://lore.kernel.org/r/20221213112851.89212-4-claudiu.beznea@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Claudiu Beznea 2022-12-13 13:28:50 +02:00 committed by Mark Brown
parent e8c8e9de4e
commit 404c61c47d
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 13 additions and 6 deletions
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19
sound/soc/atmel/mchp-pdmc.c
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@ -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)
};