[PATCH v2 02/10] ASoC: amd: acp: add acp i2s master clock generation for rembrandt platform

[Syed Saba Kareem]

Add acp i2s master clock generation logic for rembrandt platform.

Signed-off-by: V Sujith Kumar Reddy <vsujithkumar.reddy@xxxxxxx>
Signed-off-by: Syed Saba Kareem <Syed.SabaKareem@xxxxxxx>
---
 sound/soc/amd/acp/acp-legacy-common.c | 19 +++++++++++++++++++
 sound/soc/amd/acp/acp-rembrandt.c     | 26 ++++++++++++++++++++++++++
 sound/soc/amd/acp/amd.h               |  3 +++
 3 files changed, 48 insertions(+)

diff --git a/sound/soc/amd/acp/acp-legacy-common.c b/sound/soc/amd/acp/acp-legacy-common.c
index 5b7000eae693..4302d8db88a4 100644
--- a/sound/soc/amd/acp/acp-legacy-common.c
+++ b/sound/soc/amd/acp/acp-legacy-common.c
@@ -13,6 +13,7 @@
  */
 
 #include "amd.h"
+#include <linux/pci.h>
 #include <linux/export.h>
 
 static int acp_power_on(struct acp_chip_info *chip)
@@ -96,4 +97,22 @@ int acp_deinit(void __iomem *base)
 }
 EXPORT_SYMBOL_NS_GPL(acp_deinit, SND_SOC_ACP_COMMON);
 
+int smn_write(struct pci_dev *dev, u32 smn_addr, u32 data)
+{
+	pci_write_config_dword(dev, 0x60, smn_addr);
+	pci_write_config_dword(dev, 0x64, data);
+	return 0;
+}
+EXPORT_SYMBOL_NS_GPL(smn_write, SND_SOC_ACP_COMMON);
+
+int smn_read(struct pci_dev *dev, u32 smn_addr)
+{
+	u32 data;
+
+	pci_write_config_dword(dev, 0x60, smn_addr);
+	pci_read_config_dword(dev, 0x64, &data);
+	return data;
+}
+EXPORT_SYMBOL_NS_GPL(smn_read, SND_SOC_ACP_COMMON);
+
 MODULE_LICENSE("Dual BSD/GPL");
diff --git a/sound/soc/amd/acp/acp-rembrandt.c b/sound/soc/amd/acp/acp-rembrandt.c
index 59b1653b8479..82a1bf2ddfc6 100644
--- a/sound/soc/amd/acp/acp-rembrandt.c
+++ b/sound/soc/amd/acp/acp-rembrandt.c
@@ -19,11 +19,17 @@
 #include <sound/soc.h>
 #include <sound/soc-dai.h>
 #include <linux/dma-mapping.h>
+#include <linux/pci.h>
 
 #include "amd.h"
 
 #define DRV_NAME "acp_asoc_rembrandt"
 
+#define MP1_C2PMSG_69 0x3B10A14
+#define MP1_C2PMSG_85 0x3B10A54
+#define MP1_C2PMSG_93 0x3B10A74
+#define HOST_BRIDGE_ID 0x14B5
+
 static struct acp_resource rsrc = {
 	.offset = 0,
 	.no_of_ctrls = 2,
@@ -160,6 +166,25 @@ static struct snd_soc_dai_driver acp_rmb_dai[] = {
 },
 };
 
+static int acp6x_master_clock_generate(struct device *dev)
+{
+	int data = 0;
+	struct pci_dev *smn_dev;
+
+	smn_dev = pci_get_device(PCI_VENDOR_ID_AMD, HOST_BRIDGE_ID, NULL);
+	if (!smn_dev) {
+		dev_err(dev, "Failed to get host bridge device\n");
+		return -ENODEV;
+	}
+
+	smn_write(smn_dev, MP1_C2PMSG_93, 0);
+	smn_write(smn_dev, MP1_C2PMSG_85, 0xC4);
+	smn_write(smn_dev, MP1_C2PMSG_69, 0x4);
+	read_poll_timeout(smn_read, data, data, DELAY_US,
+			  ACP_TIMEOUT, false, smn_dev, MP1_C2PMSG_93);
+	return 0;
+}
+
 static void acp6x_enable_interrupts(struct acp_dev_data *adata)
 {
 	struct acp_resource *rsrc = adata->rsrc;
@@ -228,6 +253,7 @@ static int rembrandt_audio_probe(struct platform_device *pdev)
 	acp_machine_select(adata);
 
 	dev_set_drvdata(dev, adata);
+	acp6x_master_clock_generate(dev);
 	acp6x_enable_interrupts(adata);
 	acp_platform_register(dev);
 
diff --git a/sound/soc/amd/acp/amd.h b/sound/soc/amd/acp/amd.h
index 83c9a3ba8584..96bd87290eee 100644
--- a/sound/soc/amd/acp/amd.h
+++ b/sound/soc/amd/acp/amd.h
@@ -187,6 +187,9 @@ int acp_platform_unregister(struct device *dev);
 
 int acp_machine_select(struct acp_dev_data *adata);
 
+int smn_read(struct pci_dev *dev, u32 smn_addr);
+int smn_write(struct pci_dev *dev, u32 smn_addr, u32 data);
+
 int acp_init(struct acp_chip_info *chip);
 int acp_deinit(void __iomem *base);
 /* Machine configuration */
-- 
2.25.1