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cpufreq: qcom-cpufreq-hw: Clear dcvs interrupts

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It's noted that dcvs interrupts are not self-clearing, thus an interrupt
handler runs constantly, which leads to a severe regression in runtime.
To fix the problem an explicit write to clear interrupt register is
required, note that on OSM platforms the register may not be present.

Fixes: 275157b367 ("cpufreq: qcom-cpufreq-hw: Add dcvs interrupt support")
Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Vladimir Zapolskiy 2022-04-07 23:09:19 +03:00 committed by Viresh Kumar
parent 1aa24a8f3b
commit e4e6448638
1 changed files with 8 additions and 0 deletions
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8
drivers/cpufreq/qcom-cpufreq-hw.c
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@ -24,6 +24,8 @@
#define CLK_HW_DIV 2
#define LUT_TURBO_IND 1
#define GT_IRQ_STATUS BIT(2)
#define HZ_PER_KHZ 1000
struct qcom_cpufreq_soc_data {
@ -32,6 +34,7 @@ struct qcom_cpufreq_soc_data {
u32 reg_dcvs_ctrl;
u32 reg_freq_lut;
u32 reg_volt_lut;
u32 reg_intr_clr;
u32 reg_current_vote;
u32 reg_perf_state;
u8 lut_row_size;
@ -360,6 +363,10 @@ static irqreturn_t qcom_lmh_dcvs_handle_irq(int irq, void *data)
disable_irq_nosync(c_data->throttle_irq);
schedule_delayed_work(&c_data->throttle_work, 0);
if (c_data->soc_data->reg_intr_clr)
writel_relaxed(GT_IRQ_STATUS,
c_data->base + c_data->soc_data->reg_intr_clr);
return IRQ_HANDLED;
}
@ -379,6 +386,7 @@ static const struct qcom_cpufreq_soc_data epss_soc_data = {
.reg_dcvs_ctrl = 0xb0,
.reg_freq_lut = 0x100,
.reg_volt_lut = 0x200,
.reg_intr_clr = 0x308,
.reg_perf_state = 0x320,
.lut_row_size = 4,
};