linux-kernel - [PATCH v2 2/2] soc: mediatek: reuse regmap_read_poll

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Date:   Mon, 23 Apr 2018 14:42:45 +0800
From:   <sean.wang@...iatek.com>
To:     <matthias.bgg@...il.com>, <rjw@...ysocki.net>,
        <khilman@...libre.com>
CC:     <ulf.hansson@...aro.org>, <linux-mediatek@...ts.infradead.org>,
        <linux-pm@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, Sean Wang <sean.wang@...iatek.com>,
        Weiyi Lu <weiyi.lu@...iatek.com>
Subject: [PATCH v2 2/2] soc: mediatek: reuse regmap_read_poll_timeout helpers

From: Sean Wang <sean.wang@...iatek.com>

Reuse the common helpers regmap_read_poll_timeout provided by Linux core
instead of an open-coded handling.

v1 -> v2:
 - use macro definitions MTK_POLL_DELAY_US and MTK_POLL_TIMEOUT for
   arguments sleep_us and timeout_us passing in regmap_read_poll_timeout.
 - remove unnecessary linux/iopoll.h being included in.

Signed-off-by: Sean Wang <sean.wang@...iatek.com>
Cc: Matthias Brugger <matthias.bgg@...il.com>
Cc: Ulf Hansson <ulf.hansson@...aro.org>
Cc: Weiyi Lu <weiyi.lu@...iatek.com>
---
 drivers/soc/mediatek/mtk-infracfg.c | 46 ++++++++++---------------------------
 1 file changed, 12 insertions(+), 34 deletions(-)

diff --git a/drivers/soc/mediatek/mtk-infracfg.c b/drivers/soc/mediatek/mtk-infracfg.c
index 8c310de..958861c 100644
--- a/drivers/soc/mediatek/mtk-infracfg.c
+++ b/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;
 }
-- 
2.7.4