ASoC: amd: ps: refactor acp power on and reset functions.

Instead of a busy waiting while loop using udelay in
acp63_power_on and acp63_reset functions use readl_poll_timeout
function to check the condition.

Signed-off-by: Syed Saba Kareem <Syed.SabaKareem@amd.com
Reviewed-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com
Link: https://lore.kernel.org/r/20230426122219.3745586-2-Syed.SabaKareem@amd.com
Signed-off-by: Mark Brown <broonie@kernel.org

sound/soc/amd/ps/acp63.h

@@ -58,6 +58,9 @@
 #define ACP63_PDM_DEV_MASK		1
 #define ACP_DMIC_DEV	2
 
+/* time in ms for acp timeout */
+#define ACP_TIMEOUT		500
+
 enum acp_config {
 	ACP_CONFIG_0 = 0,
 	ACP_CONFIG_1,

sound/soc/amd/ps/pci-ps.c

@@ -14,13 +14,13 @@
 #include <linux/interrupt.h>
 #include <sound/pcm_params.h>
 #include <linux/pm_runtime.h>
+#include <linux/iopoll.h>
 
 #include "acp63.h"
 
 static int acp63_power_on(void __iomem *acp_base)
 {
 	u32 val;
-	int timeout;
 
 	val = readl(acp_base + ACP_PGFSM_STATUS);
 
@@ -29,38 +29,26 @@ static int acp63_power_on(void __iomem *acp_base)
 
 	if ((val & ACP_PGFSM_STATUS_MASK) != ACP_POWER_ON_IN_PROGRESS)
 		writel(ACP_PGFSM_CNTL_POWER_ON_MASK, acp_base + ACP_PGFSM_CONTROL);
-	timeout = 0;
-	while (++timeout < 500) {
-		val = readl(acp_base + ACP_PGFSM_STATUS);
-		if (!val)
-			return 0;
-		udelay(1);
-	}
-	return -ETIMEDOUT;
+
+	return readl_poll_timeout(acp_base + ACP_PGFSM_STATUS, val, !val, DELAY_US, ACP_TIMEOUT);
 }
 
 static int acp63_reset(void __iomem *acp_base)
 {
 	u32 val;
-	int timeout;
+	int ret;
 
 	writel(1, acp_base + ACP_SOFT_RESET);
-	timeout = 0;
-	while (++timeout < 500) {
-		val = readl(acp_base + ACP_SOFT_RESET);
-		if (val & ACP_SOFT_RESET_SOFTRESET_AUDDONE_MASK)
-			break;
-		cpu_relax();
-	}
+
+	ret = readl_poll_timeout(acp_base + ACP_SOFT_RESET, val,
+				 val & ACP_SOFT_RESET_SOFTRESET_AUDDONE_MASK,
+				 DELAY_US, ACP_TIMEOUT);
+	if (ret)
+		return ret;
+
 	writel(0, acp_base + ACP_SOFT_RESET);
-	timeout = 0;
-	while (++timeout < 500) {
-		val = readl(acp_base + ACP_SOFT_RESET);
-		if (!val)
-			return 0;
-		cpu_relax();
-	}
-	return -ETIMEDOUT;
+
+	return readl_poll_timeout(acp_base + ACP_SOFT_RESET, val, !val, DELAY_US, ACP_TIMEOUT);
 }
 
 static void acp63_enable_interrupts(void __iomem *acp_base)