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thermal: rcar_gen3_thermal: fix interrupt type

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Currently IRQF_SHARED type interrupt line is allocated, but it
is not appropriate, as the interrupt line isn't shared between
different devices, instead IRQF_ONESHOT is the proper type.

By changing interrupt type to IRQF_ONESHOT, now irq handler is
no longer needed, as clear of interrupt status can be done in
threaded interrupt context.

Because IRQF_ONESHOT type interrupt line is kept disabled until
the threaded handler has been run, so there is no need to protect
read/write of REG_GEN3_IRQSTR with lock.

Fixes: 7d4b269776 ("enable hardware interrupts for trip points")
Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Tested-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
This commit is contained in:
Jiada Wang 2019-04-24 14:11:44 +09:00 committed by Eduardo Valentin
parent b4ab114cc6
commit 2c0928c9e0
1 changed files with 6 additions and 32 deletions
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38
drivers/thermal/rcar_gen3_thermal.c
View file

@ -14,7 +14,6 @@
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/spinlock.h>
#include <linux/sys_soc.h>
#include <linux/thermal.h>
@ -82,7 +81,6 @@ struct rcar_gen3_thermal_tsc {
struct rcar_gen3_thermal_priv {
struct rcar_gen3_thermal_tsc *tscs[TSC_MAX_NUM];
unsigned int num_tscs;
spinlock_t lock; /* Protect interrupts on and off */
void (*thermal_init)(struct rcar_gen3_thermal_tsc *tsc);
};
@ -232,38 +230,16 @@ static irqreturn_t rcar_gen3_thermal_irq(int irq, void *data)
{
struct rcar_gen3_thermal_priv *priv = data;
u32 status;
int i, ret = IRQ_HANDLED;
int i;
spin_lock(&priv->lock);
for (i = 0; i < priv->num_tscs; i++) {
status = rcar_gen3_thermal_read(priv->tscs[i], REG_GEN3_IRQSTR);
rcar_gen3_thermal_write(priv->tscs[i], REG_GEN3_IRQSTR, 0);
if (status)
ret = IRQ_WAKE_THREAD;
thermal_zone_device_update(priv->tscs[i]->zone,
THERMAL_EVENT_UNSPECIFIED);
}
if (ret == IRQ_WAKE_THREAD)
rcar_thermal_irq_set(priv, false);
spin_unlock(&priv->lock);
return ret;
}
static irqreturn_t rcar_gen3_thermal_irq_thread(int irq, void *data)
{
struct rcar_gen3_thermal_priv *priv = data;
unsigned long flags;
int i;
for (i = 0; i < priv->num_tscs; i++)
thermal_zone_device_update(priv->tscs[i]->zone,
THERMAL_EVENT_UNSPECIFIED);
spin_lock_irqsave(&priv->lock, flags);
rcar_thermal_irq_set(priv, true);
spin_unlock_irqrestore(&priv->lock, flags);
return IRQ_HANDLED;
}
@ -371,8 +347,6 @@ static int rcar_gen3_thermal_probe(struct platform_device *pdev)
if (soc_device_match(r8a7795es1))
priv->thermal_init = rcar_gen3_thermal_init_r8a7795es1;
spin_lock_init(&priv->lock);
platform_set_drvdata(pdev, priv);
/*
@ -390,9 +364,9 @@ static int rcar_gen3_thermal_probe(struct platform_device *pdev)
if (!irqname)
return -ENOMEM;
ret = devm_request_threaded_irq(dev, irq, rcar_gen3_thermal_irq,
rcar_gen3_thermal_irq_thread,
IRQF_SHARED, irqname, priv);
ret = devm_request_threaded_irq(dev, irq, NULL,
rcar_gen3_thermal_irq,
IRQF_ONESHOT, irqname, priv);
if (ret)
return ret;
}