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Date: Wed, 23 Jan 2019 17:09:30 +0530
From: Taniya Das <tdas@...eaurora.org>
To: Matthias Kaehlcke <mka@...omium.org>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>,
Viresh Kumar <viresh.kumar@...aro.org>,
linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
Stephen Boyd <sboyd@...nel.org>,
Rajendra Nayak <rnayak@...eaurora.org>,
linux-arm-msm@...r.kernel.org, amit.kucheria@...aro.org,
evgreen@...gle.com
Subject: Re: [PATCH v4] cpufreq: qcom: Read voltage LUT and populate OPP
I have updated with the latest patch series v5.
On 1/18/2019 2:34 AM, Matthias Kaehlcke wrote:
> Hi Tanyia,
>
> On Thu, Jan 17, 2019 at 04:29:58PM +0530, Taniya Das wrote:
>> Add support to read the voltage look up table and populate OPP for all
>> corresponding CPUS for consumers like the energy model could use the
>> frequency and voltage from the OPP tables. Also update the logic to not add
>> duplicate OPPs.
>>
>> Tested-by: Matthias Kaehlcke <mka@...omium.org>
>> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
>> Signed-off-by: Taniya Das <tdas@...eaurora.org>
>> ---
>> drivers/cpufreq/qcom-cpufreq-hw.c | 41 ++++++++++++++++++++++++++++++++-------
>> 1 file changed, 34 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
>> index d83939a..e006938 100644
>> --- a/drivers/cpufreq/qcom-cpufreq-hw.c
>> +++ b/drivers/cpufreq/qcom-cpufreq-hw.c
>> @@ -10,18 +10,21 @@
>> #include <linux/module.h>
>> #include <linux/of_address.h>
>> #include <linux/of_platform.h>
>> +#include <linux/pm_opp.h>
>> #include <linux/slab.h>
>>
>> #define LUT_MAX_ENTRIES 40U
>> #define LUT_SRC GENMASK(31, 30)
>> #define LUT_L_VAL GENMASK(7, 0)
>> #define LUT_CORE_COUNT GENMASK(18, 16)
>> +#define LUT_VOLT GENMASK(11, 0)
>> #define LUT_ROW_SIZE 32
>> #define CLK_HW_DIV 2
>>
>> /* Register offsets */
>> #define REG_ENABLE 0x0
>> -#define REG_LUT_TABLE 0x110
>> +#define REG_FREQ_LUT 0x110
>> +#define REG_VOLT_LUT 0x114
>> #define REG_PERF_STATE 0x920
>>
>> static unsigned long cpu_hw_rate, xo_rate;
>> @@ -70,11 +73,12 @@ static unsigned int qcom_cpufreq_hw_fast_switch(struct cpufreq_policy *policy,
>> return policy->freq_table[index].frequency;
>> }
>>
>> -static int qcom_cpufreq_hw_read_lut(struct device *dev,
>> +static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev,
>> struct cpufreq_policy *policy,
>> void __iomem *base)
>> {
>> u32 data, src, lval, i, core_count, prev_cc = 0, prev_freq = 0, freq;
>> + u32 volt;
>> unsigned int max_cores = cpumask_weight(policy->cpus);
>> struct cpufreq_frequency_table *table;
>>
>> @@ -83,22 +87,27 @@ static int qcom_cpufreq_hw_read_lut(struct device *dev,
>> return -ENOMEM;
>>
>> for (i = 0; i < LUT_MAX_ENTRIES; i++) {
>> - data = readl_relaxed(base + REG_LUT_TABLE + i * LUT_ROW_SIZE);
>> + data = readl_relaxed(base + REG_FREQ_LUT +
>> + i * LUT_ROW_SIZE);
>> src = FIELD_GET(LUT_SRC, data);
>> lval = FIELD_GET(LUT_L_VAL, data);
>> core_count = FIELD_GET(LUT_CORE_COUNT, data);
>>
>> + data = readl_relaxed(base + REG_VOLT_LUT +
>> + i * LUT_ROW_SIZE);
>> + volt = FIELD_GET(LUT_VOLT, data) * 1000;
>> +
>> if (src)
>> freq = xo_rate * lval / 1000;
>> else
>> freq = cpu_hw_rate / 1000;
>>
>> - /* Ignore boosts in the middle of the table */
>> - if (core_count != max_cores) {
>> + if (freq != prev_freq && core_count == max_cores) {
>> table[i].frequency = CPUFREQ_ENTRY_INVALID;
>> } else {
>> table[i].frequency = freq;
>> - dev_dbg(dev, "index=%d freq=%d, core_count %d\n", i,
>> + dev_pm_opp_add(cpu_dev, freq * 1000, volt);
>> + dev_dbg(cpu_dev, "index=%d freq=%d, core_count %d\n", i,
>> freq, core_count);
>> }
>
> This marks normal entries as invalid and tries to add (potential)
> boost frequencies to the OPP table. Note that the patch I posted on
> https://lore.kernel.org/patchwork/patch/1030239/#1218724 does not only
> change the condition, but also the order of the 'if' and 'else'
> branches.
>
>> @@ -116,6 +125,7 @@ static int qcom_cpufreq_hw_read_lut(struct device *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);
>> }
>>
>> break;
>> @@ -127,6 +137,7 @@ static int qcom_cpufreq_hw_read_lut(struct device *dev,
>>
>> table[i].frequency = CPUFREQ_TABLE_END;
>> policy->freq_table = table;
>> + dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
>>
>> return 0;
>> }
>> @@ -159,10 +170,18 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
>> struct device *dev = &global_pdev->dev;
>> struct of_phandle_args args;
>> struct device_node *cpu_np;
>> + struct device *cpu_dev;
>> struct resource *res;
>> void __iomem *base;
>> int ret, index;
>>
>> + cpu_dev = get_cpu_device(policy->cpu);
>> + if (!cpu_dev) {
>> + pr_err("%s: failed to get cpu%d device\n", __func__,
>> + policy->cpu);
>> + return -ENODEV;
>> + }
>> +
>> cpu_np = of_cpu_device_node_get(policy->cpu);
>> if (!cpu_np)
>> return -EINVAL;
>> @@ -199,12 +218,18 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
>>
>> policy->driver_data = base + REG_PERF_STATE;
>>
>> - ret = qcom_cpufreq_hw_read_lut(dev, policy, base);
>> + ret = qcom_cpufreq_hw_read_lut(cpu_dev, policy, base);
>> if (ret) {
>> dev_err(dev, "Domain-%d failed to read LUT\n", index);
>> goto error;
>> }
>>
>> + ret = dev_pm_opp_get_opp_count(cpu_dev);
>> + if (ret <= 0) {
>> + dev_err(cpu_dev, "Failed to add OPPs\n");
>> + goto error;
>
> This will return 0 (success) if the OPP count is zero, which probably
> is not intended.
>
> Cheers
>
> Matthias
>
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