[PATCH 5.15 046/177] cpufreq: qcom-cpufreq-hw: Fix throttle frequency value on EPSS platforms

Greg Kroah-Hartman
2022-05-04T17:12:58Z

From: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>

[ Upstream commit f84ccad5f5660f86a642a3d7e2bfdc4e7a8a2d49 ]

On QCOM platforms with EPSS flavour of cpufreq IP a throttled frequency is
obtained from another register REG_DOMAIN_STATE, thus the helper function
qcom_lmh_get_throttle_freq() should be modified accordingly, as for now
it returns gibberish since .reg_current_vote is unset for EPSS hardware.

To exclude a hardcoded magic number 19200 it is replaced by "xo" clock rate
in KHz.

Fixes: 275157b367f4 ("cpufreq: qcom-cpufreq-hw: Add dcvs interrupt support")
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/cpufreq/qcom-cpufreq-hw.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
index dfe72d82858f..e73ecab23c85 100644
--- a/drivers/cpufreq/qcom-cpufreq-hw.c
+++ b/drivers/cpufreq/qcom-cpufreq-hw.c
@@ -28,6 +28,7 @@

struct qcom_cpufreq_soc_data {
u32 reg_enable;
+ u32 reg_domain_state;
u32 reg_freq_lut;
u32 reg_volt_lut;
u32 reg_current_vote;
@@ -266,11 +267,16 @@ static void qcom_get_related_cpus(int index, struct cpumask *m)
}
}

-static unsigned int qcom_lmh_get_throttle_freq(struct qcom_cpufreq_data *data)
+static unsigned long qcom_lmh_get_throttle_freq(struct qcom_cpufreq_data *data)
{
- unsigned int val = readl_relaxed(data->base + data->soc_data->reg_current_vote);
+ unsigned int lval;

- return (val & 0x3FF) * 19200;
+ if (data->soc_data->reg_current_vote)
+ lval = readl_relaxed(data->base + data->soc_data->reg_current_vote) & 0x3ff;
+ else
+ lval = readl_relaxed(data->base + data->soc_data->reg_domain_state) & 0xff;
+
+ return lval * xo_rate;
}

static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data)
@@ -280,14 +286,12 @@ static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data)
int cpu = cpumask_first(policy->related_cpus);
struct device *dev = get_cpu_device(cpu);
struct dev_pm_opp *opp;
- unsigned int freq;

/*
* Get the h/w throttled frequency, normalize it using the
* registered opp table and use it to calculate thermal pressure.
*/
- freq = qcom_lmh_get_throttle_freq(data);
- freq_hz = freq * HZ_PER_KHZ;
+ freq_hz = qcom_lmh_get_throttle_freq(data);

opp = dev_pm_opp_find_freq_floor(dev, &freq_hz);
if (IS_ERR(opp) && PTR_ERR(opp) == -ERANGE)
@@ -359,6 +363,7 @@ static const struct qcom_cpufreq_soc_data qcom_soc_data = {

static const struct qcom_cpufreq_soc_data epss_soc_data = {
.reg_enable = 0x0,
+ .reg_domain_state = 0x20,
.reg_freq_lut = 0x100,
.reg_volt_lut = 0x200,
.reg_perf_state = 0x320,
--
2.35.1