ASoC: SOF: mediatek: Add DSP system PM callback for mt8195

Add DSP system PM callback for suspend and resume
Signed-off-by: YC Hung <yc.hung@mediatek.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Link: https://lore.kernel.org/r/20211118100749.54628-9-daniel.baluta@oss.nxp.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/mediatek/mt8195/mt8195.c

@@ -311,6 +311,44 @@ static int mt8195_dsp_remove(struct snd_sof_dev *sdev)
 	return 0;
 }
 
+static int mt8195_dsp_suspend(struct snd_sof_dev *sdev, u32 target_state)
+{
+	struct platform_device *pdev = container_of(sdev->dev, struct platform_device, dev);
+	int ret;
+
+	/* stall and reset dsp */
+	sof_hifixdsp_shutdown(sdev);
+
+	/* power down adsp sram */
+	ret = adsp_sram_power_on(&pdev->dev, false);
+	if (ret) {
+		dev_err(sdev->dev, "adsp_sram_power_off fail!\n");
+		return ret;
+	}
+
+	/* turn off adsp clock */
+	return adsp_clock_off(sdev);
+}
+
+static int mt8195_dsp_resume(struct snd_sof_dev *sdev)
+{
+	int ret;
+
+	/* turn on adsp clock */
+	ret = adsp_clock_on(sdev);
+	if (ret) {
+		dev_err(sdev->dev, "adsp_clock_on fail!\n");
+		return ret;
+	}
+
+	/* power on adsp sram */
+	ret = adsp_sram_power_on(sdev->dev, true);
+	if (ret)
+		dev_err(sdev->dev, "adsp_sram_power_on fail!\n");
+
+	return ret;
+}
+
 /* on mt8195 there is 1 to 1 match between type and BAR idx */
 static int mt8195_get_bar_index(struct snd_sof_dev *sdev, u32 type)
 {
@@ -382,6 +420,10 @@ const struct snd_sof_dsp_ops sof_mt8195_ops = {
 	.drv = mt8195_dai,
 	.num_drv = ARRAY_SIZE(mt8195_dai),
 
+	/* PM */
+	.suspend	= mt8195_dsp_suspend,
+	.resume		= mt8195_dsp_resume,
+
 	/* ALSA HW info flags */
 	.hw_info =	SNDRV_PCM_INFO_MMAP |
 			SNDRV_PCM_INFO_MMAP_VALID |