soc: mediatek: reuse regmap_read_poll_timeout helpers

Reuse the common helpers regmap_read_poll_timeout provided by Linux core
instead of an open-coded handling.
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Weiyi Lu <weiyi.lu@mediatek.com>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

drivers/soc/mediatek/mtk-infracfg.c

@@ -17,6 +17,9 @@
 #include <linux/soc/mediatek/infracfg.h>
 #include <asm/processor.h>
 
+#define MTK_POLL_DELAY_US   10
+#define MTK_POLL_TIMEOUT    (jiffies_to_usecs(HZ))
+
 #define INFRA_TOPAXI_PROTECTEN		0x0220
 #define INFRA_TOPAXI_PROTECTSTA1	0x0228
 #define INFRA_TOPAXI_PROTECTEN_SET	0x0260
@@ -37,7 +40,6 @@
 int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask,
 		bool reg_update)
 {
-	unsigned long expired;
 	u32 val;
 	int ret;
 
@@ -47,22 +49,11 @@ int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask,
 	else
 		regmap_write(infracfg, INFRA_TOPAXI_PROTECTEN_SET, mask);
 
-	expired = jiffies + HZ;
-
-	while (1) {
-		ret = regmap_read(infracfg, INFRA_TOPAXI_PROTECTSTA1, &val);
-		if (ret)
-			return ret;
-
-		if ((val & mask) == mask)
-			break;
+	ret = regmap_read_poll_timeout(infracfg, INFRA_TOPAXI_PROTECTSTA1,
+				       val, (val & mask) == mask,
+				       MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
 
-		cpu_relax();
-		if (time_after(jiffies, expired))
-			return -EIO;
-	}
-
-	return 0;
+	return ret;
 }
 
 /**
@@ -80,30 +71,17 @@ int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask,
 int mtk_infracfg_clear_bus_protection(struct regmap *infracfg, u32 mask,
 		bool reg_update)
 {
-	unsigned long expired;
 	int ret;
+	u32 val;
 
 	if (reg_update)
 		regmap_update_bits(infracfg, INFRA_TOPAXI_PROTECTEN, mask, 0);
 	else
 		regmap_write(infracfg, INFRA_TOPAXI_PROTECTEN_CLR, mask);
 
-	expired = jiffies + HZ;
-
-	while (1) {
-		u32 val;
-
-		ret = regmap_read(infracfg, INFRA_TOPAXI_PROTECTSTA1, &val);
-		if (ret)
-			return ret;
-
-		if (!(val & mask))
-			break;
-
-		cpu_relax();
-		if (time_after(jiffies, expired))
-			return -EIO;
-	}
+	ret = regmap_read_poll_timeout(infracfg, INFRA_TOPAXI_PROTECTSTA1,
+				       val, !(val & mask),
+				       MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
 
-	return 0;
+	return ret;
 }