Unverified Commit 404c61c4 authored by Claudiu Beznea's avatar Claudiu Beznea Committed by Mark Brown
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ASoC: mchp-pdmc: add support for suspend to RAM 



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: default avatarClaudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20221213112851.89212-4-claudiu.beznea@microchip.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent e8c8e9de

sound/soc/atmel/mchp-pdmc.c

+13 −6
Original line number Diff line number Diff line
@@ -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)

};