ASoC: amd: add acp6x pdm driver pm ops

Add acp6x pdm driver pm ops.
Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
Link: https://lore.kernel.org/r/20211018112044.1705805-10-Vijendar.Mukunda@amd.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/amd/yc/acp6x-pdm-dma.c

@@ -12,6 +12,7 @@
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/soc-dai.h>
+#include <linux/pm_runtime.h>
 
 #include "acp6x.h"
 
@@ -373,13 +374,69 @@ static int acp6x_pdm_audio_probe(struct platform_device *pdev)
 
 		return -ENODEV;
 	}
+	pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS);
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+	pm_runtime_allow(&pdev->dev);
 	return 0;
 }
 
+static int acp6x_pdm_audio_remove(struct platform_device *pdev)
+{
+	pm_runtime_disable(&pdev->dev);
+	return 0;
+}
+
+static int __maybe_unused acp6x_pdm_resume(struct device *dev)
+{
+	struct pdm_dev_data *adata;
+	struct snd_pcm_runtime *runtime;
+	struct pdm_stream_instance *rtd;
+	u32 period_bytes, buffer_len;
+
+	adata = dev_get_drvdata(dev);
+	if (adata->capture_stream && adata->capture_stream->runtime) {
+		runtime = adata->capture_stream->runtime;
+		rtd = runtime->private_data;
+		period_bytes = frames_to_bytes(runtime, runtime->period_size);
+		buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
+		acp6x_config_dma(rtd, SNDRV_PCM_STREAM_CAPTURE);
+		acp6x_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, buffer_len,
+					   period_bytes, adata->acp6x_base);
+	}
+	acp6x_enable_pdm_interrupts(adata->acp6x_base);
+	return 0;
+}
+
+static int __maybe_unused acp6x_pdm_suspend(struct device *dev)
+{
+	struct pdm_dev_data *adata;
+
+	adata = dev_get_drvdata(dev);
+	acp6x_disable_pdm_interrupts(adata->acp6x_base);
+	return 0;
+}
+
+static int __maybe_unused acp6x_pdm_runtime_resume(struct device *dev)
+{
+	struct pdm_dev_data *adata;
+
+	adata = dev_get_drvdata(dev);
+	acp6x_enable_pdm_interrupts(adata->acp6x_base);
+	return 0;
+}
+
+static const struct dev_pm_ops acp6x_pdm_pm_ops = {
+	SET_RUNTIME_PM_OPS(acp6x_pdm_suspend, acp6x_pdm_runtime_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(acp6x_pdm_suspend, acp6x_pdm_resume)
+};
+
 static struct platform_driver acp6x_pdm_dma_driver = {
 	.probe = acp6x_pdm_audio_probe,
+	.remove = acp6x_pdm_audio_remove,
 	.driver = {
 		.name = "acp_yc_pdm_dma",
+		.pm = &acp6x_pdm_pm_ops,
 	},
 };