ASoC: SOF: amd: refactor PSP smn_read

Use the read_poll_timeout marco for PSP smn_read calls.
Signed-off-by: Mastan Katragadda <Mastan.Katragadda@amd.com>
Link: https://lore.kernel.org/r/20230630070544.2167421-2-Mastan.Katragadda@amd.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/amd/acp.c

@@ -28,12 +28,14 @@ static int smn_write(struct pci_dev *dev, u32 smn_addr, u32 data)
 	return 0;
 }
 
-static int smn_read(struct pci_dev *dev, u32 smn_addr, u32 *data)
+static int smn_read(struct pci_dev *dev, u32 smn_addr)
 {
+	u32 data = 0;
+
 	pci_write_config_dword(dev, 0x60, smn_addr);
-	pci_read_config_dword(dev, 0x64, data);
+	pci_read_config_dword(dev, 0x64, &data);
 
-	return 0;
+	return data;
 }
 
 static void init_dma_descriptor(struct acp_dev_data *adata)
@@ -150,15 +152,13 @@ int configure_and_run_dma(struct acp_dev_data *adata, unsigned int src_addr,
 static int psp_mbox_ready(struct acp_dev_data *adata, bool ack)
 {
 	struct snd_sof_dev *sdev = adata->dev;
-	int timeout;
+	int ret;
 	u32 data;
 
-	for (timeout = ACP_PSP_TIMEOUT_COUNTER; timeout > 0; timeout--) {
-		msleep(20);
-		smn_read(adata->smn_dev, MP0_C2PMSG_114_REG, &data);
-		if (data & MBOX_READY_MASK)
-			return 0;
-	}
+	ret = read_poll_timeout(smn_read, data, data & MBOX_READY_MASK, MBOX_DELAY_US,
+				ACP_PSP_TIMEOUT_US, false, adata->smn_dev, MP0_C2PMSG_114_REG);
+	if (!ret)
+		return 0;
 
 	dev_err(sdev->dev, "PSP error status %x\n", data & MBOX_STATUS_MASK);
 
@@ -177,23 +177,19 @@ static int psp_mbox_ready(struct acp_dev_data *adata, bool ack)
 static int psp_send_cmd(struct acp_dev_data *adata, int cmd)
 {
 	struct snd_sof_dev *sdev = adata->dev;
-	int ret, timeout;
+	int ret;
 	u32 data;
 
 	if (!cmd)
 		return -EINVAL;
 
 	/* Get a non-zero Doorbell value from PSP */
-	for (timeout = ACP_PSP_TIMEOUT_COUNTER; timeout > 0; timeout--) {
-		msleep(MBOX_DELAY);
-		smn_read(adata->smn_dev, MP0_C2PMSG_73_REG, &data);
-		if (data)
-			break;
-	}
+	ret = read_poll_timeout(smn_read, data, data, MBOX_DELAY_US, ACP_PSP_TIMEOUT_US, false,
+				adata->smn_dev, MP0_C2PMSG_73_REG);
 
-	if (!timeout) {
+	if (ret) {
 		dev_err(sdev->dev, "Failed to get Doorbell from MBOX %x\n", MP0_C2PMSG_73_REG);
-		return -EINVAL;
+		return ret;
 	}
 
 	/* Check if PSP is ready for new command */

sound/soc/sof/amd/acp.h

@@ -61,12 +61,12 @@
 #define HOST_BRIDGE_CZN				0x1630
 #define HOST_BRIDGE_RMB				0x14B5
 #define ACP_SHA_STAT				0x8000
-#define ACP_PSP_TIMEOUT_COUNTER			5
+#define ACP_PSP_TIMEOUT_US			1000000
 #define ACP_EXT_INTR_ERROR_STAT			0x20000000
 #define MP0_C2PMSG_114_REG			0x3810AC8
 #define MP0_C2PMSG_73_REG			0x3810A24
 #define MBOX_ACP_SHA_DMA_COMMAND		0x70000
-#define MBOX_DELAY				1000
+#define MBOX_DELAY_US				1000
 #define MBOX_READY_MASK				0x80000000
 #define MBOX_STATUS_MASK			0xFFFF