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SubjectRe: [PATCH v5 2/2] cpufreq: qcom-hw: Add support for QCOM cpufreq HW driver
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Hello Evan,

Thank you for testing the patch.

On 7/17/2018 4:32 AM, Evan Green wrote:
> Hi Taniya,
> On Thu, Jul 12, 2018 at 11:06 AM Taniya Das <tdas@codeaurora.org> wrote:
>>
>> The CPUfreq HW present in some QCOM chipsets offloads the steps necessary
>> for changing the frequency of CPUs. The driver implements the cpufreq
>> driver interface for this hardware engine.
>>
>> Signed-off-by: Saravana Kannan <skannan@codeaurora.org>
>> Signed-off-by: Taniya Das <tdas@codeaurora.org>
>> ---
>> drivers/cpufreq/Kconfig.arm | 10 ++
>> drivers/cpufreq/Makefile | 1 +
>> drivers/cpufreq/qcom-cpufreq-hw.c | 344 ++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 355 insertions(+)
>> create mode 100644 drivers/cpufreq/qcom-cpufreq-hw.c
>>
> ...
>> diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
>> new file mode 100644
>> index 0000000..fa25a95
>> --- /dev/null
>> +++ b/drivers/cpufreq/qcom-cpufreq-hw.c
> ...
>> +static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
>> +{
>> + struct cpufreq_qcom *c;
>> +
>> + c = qcom_freq_domain_map[policy->cpu];
>> + if (!c) {
>> + pr_err("No scaling support for CPU%d\n", policy->cpu);
>> + return -ENODEV;
>> + }
>> +
>> + cpumask_copy(policy->cpus, &c->related_cpus);
>> +
>> + policy->fast_switch_possible = true;
>> + policy->freq_table = c->table;
>> + policy->driver_data = c;
>> +
>> + return 0;
> I haven't looked at this driver in detail, but I have tested it.
> Instead of the line above, I needed:
>
> return cpufreq_table_validate_and_show(policy, c->table);
>
> Without this the framework thinks that the min and max frequencies are
> zero, and then you get a warning about an invalid table. I also
> removed "policy->freq_table = c->table", since validate_and_show does
> this.
> -Evan
>

The API is no longer supported,

https://patchwork.kernel.org/patch/10320897/

If you are using the 4.14 kernel, you do need to replace

-policy->freq_table = c->table;
+cpufreq_table_validate_and_show(policy, c->table);

--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation.

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