ASoC: SOF: amd: Add SOF pm ops callback for Renoir

Add SOF PM ops callback in renoir dsp ops to power off and on ACP
IP block during system suspend and resume on Renoir platform.

Signed-off-by: Ajit Kumar Pandey <AjitKumar.Pandey@amd.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20220606210212.146626-2-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/amd/acp-dsp-offset.h

@@ -46,12 +46,14 @@
 #define ACPAXI2AXI_ATU_BASE_ADDR_GRP_8		0xC3C
 #define ACPAXI2AXI_ATU_CTRL			0xC40
 #define ACP_SOFT_RESET				0x1000
+#define ACP_CONTROL				0x1004
 
 #define ACP_I2S_PIN_CONFIG			0x1400
 
 /* Registers from ACP_PGFSM block */
 #define ACP_PGFSM_CONTROL			0x141C
 #define ACP_PGFSM_STATUS			0x1420
+#define ACP_CLKMUX_SEL				0x1424
 
 /* Registers from ACP_INTR block */
 #define ACP_EXTERNAL_INTR_ENB			0x1800

sound/soc/sof/amd/acp.c

@@ -413,10 +413,46 @@ static int acp_init(struct snd_sof_dev *sdev)
 		dev_err(sdev->dev, "ACP power on failed\n");
 		return ret;
 	}
+
+	snd_sof_dsp_write(sdev, ACP_DSP_BAR, ACP_CONTROL, 0x01);
 	/* Reset */
 	return acp_reset(sdev);
 }
 
+int amd_sof_acp_suspend(struct snd_sof_dev *sdev, u32 target_state)
+{
+	int ret;
+
+	ret = acp_reset(sdev);
+	if (ret) {
+		dev_err(sdev->dev, "ACP Reset failed\n");
+		return ret;
+	}
+
+	snd_sof_dsp_write(sdev, ACP_DSP_BAR, ACP_CONTROL, 0x00);
+
+	return 0;
+}
+EXPORT_SYMBOL_NS(amd_sof_acp_suspend, SND_SOC_SOF_AMD_COMMON);
+
+int amd_sof_acp_resume(struct snd_sof_dev *sdev)
+{
+	int ret;
+
+	ret = acp_init(sdev);
+	if (ret) {
+		dev_err(sdev->dev, "ACP Init failed\n");
+		return ret;
+	}
+
+	snd_sof_dsp_write(sdev, ACP_DSP_BAR, ACP_CLKMUX_SEL, 0x03);
+
+	ret = acp_memory_init(sdev);
+
+	return ret;
+}
+EXPORT_SYMBOL_NS(amd_sof_acp_resume, SND_SOC_SOF_AMD_COMMON);
+
 int amd_sof_acp_probe(struct snd_sof_dev *sdev)
 {
 	struct pci_dev *pci = to_pci_dev(sdev->dev);

sound/soc/sof/amd/acp.h

@@ -216,6 +216,10 @@ int acp_sof_trace_init(struct snd_sof_dev *sdev, struct snd_dma_buffer *dmab,
 		       struct sof_ipc_dma_trace_params_ext *dtrace_params);
 int acp_sof_trace_release(struct snd_sof_dev *sdev);
 
+/* PM Callbacks */
+int amd_sof_acp_suspend(struct snd_sof_dev *sdev, u32 target_state);
+int amd_sof_acp_resume(struct snd_sof_dev *sdev);
+
 struct sof_amd_acp_desc {
 	unsigned int host_bridge_id;
 };

sound/soc/sof/amd/pci-rn.c

@@ -49,6 +49,7 @@ static const struct sof_amd_acp_desc renoir_chip_info = {
 
 static const struct sof_dev_desc renoir_desc = {
 	.machines		= snd_soc_acpi_amd_sof_machines,
+	.use_acpi_target_states	= true,
 	.resindex_lpe_base	= 0,
 	.resindex_pcicfg_base	= -1,
 	.resindex_imr_base	= -1,
@@ -166,6 +167,9 @@ static struct pci_driver snd_sof_pci_amd_rn_driver = {
 	.id_table = rn_pci_ids,
 	.probe = acp_pci_rn_probe,
 	.remove = acp_pci_rn_remove,
+	.driver = {
+		.pm = &sof_pci_pm,
+	},
 };
 module_pci_driver(snd_sof_pci_amd_rn_driver);
 

sound/soc/sof/amd/renoir.c

@@ -173,6 +173,10 @@ struct snd_sof_dsp_ops sof_renoir_ops = {
 	/* Trace Logger */
 	.trace_init		= acp_sof_trace_init,
 	.trace_release		= acp_sof_trace_release,
+
+	/* PM */
+	.suspend                = amd_sof_acp_suspend,
+	.resume                 = amd_sof_acp_resume,
 };
 EXPORT_SYMBOL(sof_renoir_ops);