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Subject[PATCH RFC 7/9] cpufreq: qcom: Add support to update cpu node's OPP tables
Date
Add support to parse and update OPP tables attached to the cpu nodes.

Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
---
drivers/cpufreq/qcom-cpufreq-hw.c | 29 +++++++++++++++++++++++++++--
1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
index 4b0b50403901..5c268dd2346c 100644
--- a/drivers/cpufreq/qcom-cpufreq-hw.c
+++ b/drivers/cpufreq/qcom-cpufreq-hw.c
@@ -73,6 +73,25 @@ static unsigned int qcom_cpufreq_hw_fast_switch(struct cpufreq_policy *policy,
return policy->freq_table[index].frequency;
}

+static int qcom_find_update_opp(struct device *cpu_dev, unsigned long freq,
+ unsigned long volt)
+{
+ int ret;
+ struct dev_pm_opp *opp;
+
+ opp = dev_pm_opp_find_freq_exact(cpu_dev, freq, true);
+ if (IS_ERR(opp)) {
+ ret = dev_pm_opp_add(cpu_dev, freq, volt);
+ } else {
+ dev_pm_opp_disable(cpu_dev, freq);
+ ret = dev_pm_opp_update_voltage(cpu_dev, freq, volt);
+ dev_pm_opp_enable(cpu_dev, freq);
+ dev_pm_opp_put(opp);
+ }
+
+ return ret;
+}
+
static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev,
struct cpufreq_policy *policy,
void __iomem *base)
@@ -81,11 +100,16 @@ static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev,
u32 volt;
unsigned int max_cores = cpumask_weight(policy->cpus);
struct cpufreq_frequency_table *table;
+ int ret;

table = kcalloc(LUT_MAX_ENTRIES + 1, sizeof(*table), GFP_KERNEL);
if (!table)
return -ENOMEM;

+ ret = dev_pm_opp_of_add_table(cpu_dev);
+ if (ret)
+ dev_dbg(cpu_dev, "Couldn't add OPP table\n");
+
for (i = 0; i < LUT_MAX_ENTRIES; i++) {
data = readl_relaxed(base + REG_FREQ_LUT +
i * LUT_ROW_SIZE);
@@ -104,7 +128,7 @@ static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev,

if (freq != prev_freq && core_count == max_cores) {
table[i].frequency = freq;
- dev_pm_opp_add(cpu_dev, freq * 1000, volt);
+ qcom_find_update_opp(cpu_dev, freq * 1000, volt);
dev_dbg(cpu_dev, "index=%d freq=%d, core_count %d\n", i,
freq, core_count);
} else {
@@ -125,7 +149,8 @@ static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev,
if (prev_cc != max_cores) {
prev->frequency = prev_freq;
prev->flags = CPUFREQ_BOOST_FREQ;
- dev_pm_opp_add(cpu_dev, prev_freq * 1000, volt);
+ qcom_find_update_opp(cpu_dev, prev_freq * 1000,
+ volt);
}

break;
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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