ASoC: mchp-spdiftx: add support for system suspend/resume

Add support for system suspend/resume by moving the enable/disable
of interrupts in mchp_spdiftx_trigger() on SNDRV_PCM_TRIGGER_SUSPEND/
SNDRV_PCM_TRIGGER_RESUME commands.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20221117123750.291911-4-claudiu.beznea@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/atmel/mchp-spdiftx.c b/sound/soc/atmel/mchp-spdiftx.c
index ec454e64d85ce3703c260e5a48d04dd57267de36..dc96a6fbf514e14edaf94134cf2e2d19098ef340 100644 (file)
--- a/sound/soc/atmel/mchp-spdiftx.c
+++ b/sound/soc/atmel/mchp-spdiftx.c
@@ -198,6 +198,7 @@ struct mchp_spdiftx_dev {
        struct clk                              *pclk;
        struct clk                              *gclk;
        unsigned int                            fmt;
+       unsigned int                            suspend_irq;
 };
 
 static inline int mchp_spdiftx_is_running(struct mchp_spdiftx_dev *dev)
@@ -318,16 +319,25 @@ static int mchp_spdiftx_trigger(struct snd_pcm_substream *substream, int cmd,
        running = !!(mr & SPDIFTX_MR_TXEN_ENABLE);
 
        switch (cmd) {
-       case SNDRV_PCM_TRIGGER_START:
        case SNDRV_PCM_TRIGGER_RESUME:
+       case SNDRV_PCM_TRIGGER_START:
+               regmap_write(dev->regmap, SPDIFTX_IER, dev->suspend_irq |
+                            SPDIFTX_IR_TXUDR | SPDIFTX_IR_TXOVR);
+               dev->suspend_irq = 0;
+               fallthrough;
        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
                if (!running) {
                        mr &= ~SPDIFTX_MR_TXEN_MASK;
                        mr |= SPDIFTX_MR_TXEN_ENABLE;
                }
                break;
-       case SNDRV_PCM_TRIGGER_STOP:
        case SNDRV_PCM_TRIGGER_SUSPEND:
+               regmap_read(dev->regmap, SPDIFTX_IMR, &dev->suspend_irq);
+               fallthrough;
+       case SNDRV_PCM_TRIGGER_STOP:
+               regmap_write(dev->regmap, SPDIFTX_IDR, dev->suspend_irq |
+                            SPDIFTX_IR_TXUDR | SPDIFTX_IR_TXOVR);
+               fallthrough;
        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
                if (running) {
                        mr &= ~SPDIFTX_MR_TXEN_MASK;
@@ -507,10 +517,6 @@ static int mchp_spdiftx_hw_params(struct snd_pcm_substream *substream,
        dev_dbg(dev->dev, "%s(): GCLK set to %d\n", __func__,
                params_rate(params) * SPDIFTX_GCLK_RATIO);
 
-       /* Enable interrupts */
-       regmap_write(dev->regmap, SPDIFTX_IER,
-                    SPDIFTX_IR_TXUDR | SPDIFTX_IR_TXOVR);
-
        regmap_write(dev->regmap, SPDIFTX_MR, mr);
 
        return 0;
@@ -521,9 +527,6 @@ static int mchp_spdiftx_hw_free(struct snd_pcm_substream *substream,
 {
        struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai);
 
-       regmap_write(dev->regmap, SPDIFTX_IDR,
-                    SPDIFTX_IR_TXUDR | SPDIFTX_IR_TXOVR);
-
        return regmap_write(dev->regmap, SPDIFTX_CR,
                            SPDIFTX_CR_SWRST | SPDIFTX_CR_FCLR);
 }
@@ -785,6 +788,7 @@ disable_pclk:
 }
 
 static const struct dev_pm_ops mchp_spdiftx_pm_ops = {
+       SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume)
        RUNTIME_PM_OPS(mchp_spdiftx_runtime_suspend, mchp_spdiftx_runtime_resume,
                       NULL)
 };