linux-kernel - [PATCH] Lock 7 is cpuidle specific, use non-generic value for locking

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Message-Id: <1426189108-35488-1-git-send-email-lina.iyer@linaro.org>
Date:	Thu, 12 Mar 2015 13:38:28 -0600
From:	Lina Iyer <lina.iyer@...aro.org>
To:	bjorn.andersson@...ymobile.com
Cc:	linux-arm-msm@...r.kernel.org, jhugo@...eaurora.org,
	agross@...eaurora.org, linux-kernel@...r.kernel.org,
	Lina Iyer <lina.iyer@...aro.org>
Subject: [PATCH] Lock 7 is cpuidle specific, use non-generic value for locking

---
 drivers/hwspinlock/qcom_hwspinlock.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/hwspinlock/qcom_hwspinlock.c b/drivers/hwspinlock/qcom_hwspinlock.c
index 93b62e0..7642524 100644
--- a/drivers/hwspinlock/qcom_hwspinlock.c
+++ b/drivers/hwspinlock/qcom_hwspinlock.c
@@ -25,16 +25,23 @@
 
 #include "hwspinlock_internal.h"
 
-#define QCOM_MUTEX_APPS_PROC_ID	1
-#define QCOM_MUTEX_NUM_LOCKS	32
+#define QCOM_MUTEX_APPS_PROC_ID		1
+#define QCOM_MUTEX_CPUIDLE_OFFSET	128
+#define QCOM_CPUIDLE_LOCK		7
+#define QCOM_MUTEX_NUM_LOCKS		32
 
 static int qcom_hwspinlock_trylock(struct hwspinlock *lock)
 {
 	struct regmap_field *field = lock->priv;
 	u32 lock_owner;
 	int ret;
+	u32 proc_id;
 
-	ret = regmap_field_write(field, QCOM_MUTEX_APPS_PROC_ID);
+	proc_id = hwspin_lock_get_id(lock) == QCOM_CPUIDLE_LOCK ?
+			QCOM_MUTEX_CPUIDLE_OFFSET + smp_processor_id():
+			QCOM_MUTEX_APPS_PROC_ID;
+
+	ret = regmap_field_write(field, proc_id);
 	if (ret)
 		return ret;
 
@@ -42,7 +49,7 @@ static int qcom_hwspinlock_trylock(struct hwspinlock *lock)
 	if (ret)
 		return ret;
 
-	return lock_owner == QCOM_MUTEX_APPS_PROC_ID;
+	return lock_owner == proc_id;
 }
 
 static void qcom_hwspinlock_unlock(struct hwspinlock *lock)
-- 
2.1.0

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