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PM / devfreq: tegra: Drop primary interrupt handler 

There is no real need in the primary interrupt handler, hence move
everything to the secondary (threaded) handler. In a result locking
is consistent now and there are no potential races with the interrupt
handler because it is protected with the devfreq's mutex.

Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
This commit is contained in:
Dmitry Osipenko 2019-05-02 02:38:05 +03:00 committed by MyungJoo Ham
parent b061312f4b
commit dd3f2616bb
1 changed files with 18 additions and 37 deletions
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55
drivers/devfreq/tegra-devfreq.c
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@ -132,7 +132,6 @@ static struct tegra_devfreq_device_config actmon_device_configs[] = {
struct tegra_devfreq_device {
const struct tegra_devfreq_device_config *config;
void __iomem *regs;
spinlock_t lock;
/* Average event count sampled in the last interrupt */
u32 avg_count;
@ -237,11 +236,8 @@ static void actmon_write_barrier(struct tegra_devfreq *tegra)
static void actmon_isr_device(struct tegra_devfreq *tegra,
struct tegra_devfreq_device *dev)
{
unsigned long flags;
u32 intr_status, dev_ctrl;
spin_lock_irqsave(&dev->lock, flags);
dev->avg_count = device_readl(dev, ACTMON_DEV_AVG_COUNT);
tegra_devfreq_update_avg_wmark(tegra, dev);
@ -290,26 +286,6 @@ static void actmon_isr_device(struct tegra_devfreq *tegra,
device_writel(dev, ACTMON_INTR_STATUS_CLEAR, ACTMON_DEV_INTR_STATUS);
actmon_write_barrier(tegra);
spin_unlock_irqrestore(&dev->lock, flags);
}
static irqreturn_t actmon_isr(int irq, void *data)
{
struct tegra_devfreq *tegra = data;
bool handled = false;
unsigned int i;
u32 val;
val = actmon_readl(tegra, ACTMON_GLB_STATUS);
for (i = 0; i < ARRAY_SIZE(tegra->devices); i++) {
if (val & tegra->devices[i].config->irq_mask) {
actmon_isr_device(tegra, tegra->devices + i);
handled = true;
}
}
return handled ? IRQ_WAKE_THREAD : IRQ_NONE;
}
static unsigned long actmon_cpu_to_emc_rate(struct tegra_devfreq *tegra,
@ -336,15 +312,12 @@ static void actmon_update_target(struct tegra_devfreq *tegra,
unsigned long cpu_freq = 0;
unsigned long static_cpu_emc_freq = 0;
unsigned int avg_sustain_coef;
unsigned long flags;
if (dev->config->avg_dependency_threshold) {
cpu_freq = cpufreq_get(0);
static_cpu_emc_freq = actmon_cpu_to_emc_rate(tegra, cpu_freq);
}
spin_lock_irqsave(&dev->lock, flags);
dev->target_freq = dev->avg_count / ACTMON_SAMPLING_PERIOD;
avg_sustain_coef = 100 * 100 / dev->config->boost_up_threshold;
dev->target_freq = do_percent(dev->target_freq, avg_sustain_coef);
@ -352,19 +325,31 @@ static void actmon_update_target(struct tegra_devfreq *tegra,
if (dev->avg_count >= dev->config->avg_dependency_threshold)
dev->target_freq = max(dev->target_freq, static_cpu_emc_freq);
spin_unlock_irqrestore(&dev->lock, flags);
}
static irqreturn_t actmon_thread_isr(int irq, void *data)
{
struct tegra_devfreq *tegra = data;
bool handled = false;
unsigned int i;
u32 val;
mutex_lock(&tegra->devfreq->lock);
update_devfreq(tegra->devfreq);
val = actmon_readl(tegra, ACTMON_GLB_STATUS);
for (i = 0; i < ARRAY_SIZE(tegra->devices); i++) {
if (val & tegra->devices[i].config->irq_mask) {
actmon_isr_device(tegra, tegra->devices + i);
handled = true;
}
}
if (handled)
update_devfreq(tegra->devfreq);
mutex_unlock(&tegra->devfreq->lock);
return IRQ_HANDLED;
return handled ? IRQ_HANDLED : IRQ_NONE;
}
static int tegra_actmon_rate_notify_cb(struct notifier_block *nb,
@ -374,7 +359,6 @@ static int tegra_actmon_rate_notify_cb(struct notifier_block *nb,
struct tegra_devfreq *tegra;
struct tegra_devfreq_device *dev;
unsigned int i;
unsigned long flags;
if (action != POST_RATE_CHANGE)
return NOTIFY_OK;
@ -386,9 +370,7 @@ static int tegra_actmon_rate_notify_cb(struct notifier_block *nb,
for (i = 0; i < ARRAY_SIZE(tegra->devices); i++) {
dev = &tegra->devices[i];
spin_lock_irqsave(&dev->lock, flags);
tegra_devfreq_update_wmark(tegra, dev);
spin_unlock_irqrestore(&dev->lock, flags);
}
actmon_write_barrier(tegra);
@ -670,7 +652,6 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
dev = tegra->devices + i;
dev->config = actmon_device_configs + i;
dev->regs = tegra->regs + dev->config->offset;
spin_lock_init(&dev->lock);
tegra_actmon_configure_device(tegra, dev);
}
@ -688,8 +669,8 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, tegra);
err = devm_request_threaded_irq(&pdev->dev, irq, actmon_isr,
actmon_thread_isr, IRQF_SHARED,
err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
actmon_thread_isr, IRQF_ONESHOT,
"tegra-devfreq", tegra);
if (err) {
dev_err(&pdev->dev, "Interrupt request failed\n");