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authorKuninori Morimoto <kuninori.morimoto.gx@renesas.com>2013-01-31 13:03:22 +0400
committerZhang Rui <rui.zhang@intel.com>2013-02-06 10:13:57 +0400
commitb2bbc6a2ace78eaca2f6482b58b984519aa783ac (patch)
tree1273d37753c5eaffde6f8627dd432a6299c9c5d7 /drivers/thermal/rcar_thermal.c
parentf8f53e1874c2dfddf4c6dc69008ba85d6de4d944 (diff)
downloadlinux-b2bbc6a2ace78eaca2f6482b58b984519aa783ac.tar.xz
thermal: rcar: use mutex lock instead of spin lock
Current R-Car thermal driver is using spin lock for each registers read/write, but it is pointless lock. This lock is required while reading temperature, but it needs long wait (= 300ms). So, this patch used mutex lock while reading temperature, instead of spin lock for each registers. Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Diffstat (limited to 'drivers/thermal/rcar_thermal.c')
-rw-r--r--drivers/thermal/rcar_thermal.c30
1 files changed, 7 insertions, 23 deletions
diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c
index 068b2a1c5c15..e19b267f76d6 100644
--- a/drivers/thermal/rcar_thermal.c
+++ b/drivers/thermal/rcar_thermal.c
@@ -42,7 +42,7 @@
struct rcar_thermal_priv {
void __iomem *base;
struct device *dev;
- spinlock_t lock;
+ struct mutex lock;
};
#define MCELSIUS(temp) ((temp) * 1000)
@@ -54,46 +54,26 @@ struct rcar_thermal_priv {
*/
static u32 rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg)
{
- unsigned long flags;
- u32 ret;
-
- spin_lock_irqsave(&priv->lock, flags);
-
- ret = ioread32(priv->base + reg);
-
- spin_unlock_irqrestore(&priv->lock, flags);
-
- return ret;
+ return ioread32(priv->base + reg);
}
#if 0 /* no user at this point */
static void rcar_thermal_write(struct rcar_thermal_priv *priv,
u32 reg, u32 data)
{
- unsigned long flags;
-
- spin_lock_irqsave(&priv->lock, flags);
-
iowrite32(data, priv->base + reg);
-
- spin_unlock_irqrestore(&priv->lock, flags);
}
#endif
static void rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg,
u32 mask, u32 data)
{
- unsigned long flags;
u32 val;
- spin_lock_irqsave(&priv->lock, flags);
-
val = ioread32(priv->base + reg);
val &= ~mask;
val |= (data & mask);
iowrite32(val, priv->base + reg);
-
- spin_unlock_irqrestore(&priv->lock, flags);
}
/*
@@ -107,6 +87,8 @@ static int rcar_thermal_get_temp(struct thermal_zone_device *zone,
int i;
int ctemp, old, new;
+ mutex_lock(&priv->lock);
+
/*
* TSC decides a value of CPTAP automatically,
* and this is the conditions which validate interrupt.
@@ -138,6 +120,8 @@ static int rcar_thermal_get_temp(struct thermal_zone_device *zone,
*temp = MCELSIUS((ctemp * 5) - 65);
+ mutex_unlock(&priv->lock);
+
return 0;
}
@@ -225,7 +209,7 @@ static int rcar_thermal_probe(struct platform_device *pdev)
}
priv->dev = &pdev->dev;
- spin_lock_init(&priv->lock);
+ mutex_init(&priv->lock);
priv->base = devm_ioremap_nocache(&pdev->dev,
res->start, resource_size(res));
if (!priv->base) {