linux-kernel - Re: [PATCH V2] cpufreq: tegra186: Fix initial frequency

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Message-ID: <ab693b02-9ae2-48c2-0104-e82d949d82b7@nvidia.com>
Date:   Tue, 25 Aug 2020 09:22:38 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
CC:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Thierry Reding <thierry.reding@...il.com>,
        <linux-pm@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] cpufreq: tegra186: Fix initial frequency


On 25/08/2020 06:50, Viresh Kumar wrote:
> On 24-08-20, 15:59, Jon Hunter wrote:
>> Commit 6cc3d0e9a097 ("cpufreq: tegra186: add
>> CPUFREQ_NEED_INITIAL_FREQ_CHECK flag") fixed CPUFREQ support for
>> Tegra186 but as a consequence the following warnings are now seen on
>> boot ...
>>
>>  cpufreq: cpufreq_online: CPU0: Running at unlisted freq: 0 KHz
>>  cpufreq: cpufreq_online: CPU0: Unlisted initial frequency changed to: 2035200 KHz
>>  cpufreq: cpufreq_online: CPU1: Running at unlisted freq: 0 KHz
>>  cpufreq: cpufreq_online: CPU1: Unlisted initial frequency changed to: 2035200 KHz
>>  cpufreq: cpufreq_online: CPU2: Running at unlisted freq: 0 KHz
>>  cpufreq: cpufreq_online: CPU2: Unlisted initial frequency changed to: 2035200 KHz
>>  cpufreq: cpufreq_online: CPU3: Running at unlisted freq: 0 KHz
>>  cpufreq: cpufreq_online: CPU3: Unlisted initial frequency changed to: 2035200 KHz
>>  cpufreq: cpufreq_online: CPU4: Running at unlisted freq: 0 KHz
>>  cpufreq: cpufreq_online: CPU4: Unlisted initial frequency changed to: 2035200 KHz
>>  cpufreq: cpufreq_online: CPU5: Running at unlisted freq: 0 KHz
>>  cpufreq: cpufreq_online: CPU5: Unlisted initial frequency changed to: 2035200 KHz
>>
>> Fix this by adding a 'get' callback for the Tegra186 CPUFREQ driver to
>> retrieve the current operating frequency for a given CPU. The 'get'
>> callback uses the current 'ndiv' value that is programmed to determine
>> that current operating frequency.
>>
>> Signed-off-by: Jon Hunter <jonathanh@...dia.com>
>> ---
>> Changes since V1:
>> - Moved code into a 'get' callback
>>
>>  drivers/cpufreq/tegra186-cpufreq.c | 30 ++++++++++++++++++++++++++++++
>>  1 file changed, 30 insertions(+)
>>
>> diff --git a/drivers/cpufreq/tegra186-cpufreq.c b/drivers/cpufreq/tegra186-cpufreq.c
>> index 01e1f58ba422..0d0fcff60765 100644
>> --- a/drivers/cpufreq/tegra186-cpufreq.c
>> +++ b/drivers/cpufreq/tegra186-cpufreq.c
>> @@ -14,6 +14,7 @@
>>  
>>  #define EDVD_CORE_VOLT_FREQ(core)		(0x20 + (core) * 0x4)
>>  #define EDVD_CORE_VOLT_FREQ_F_SHIFT		0
>> +#define EDVD_CORE_VOLT_FREQ_F_MASK		0xffff
>>  #define EDVD_CORE_VOLT_FREQ_V_SHIFT		16
>>  
>>  struct tegra186_cpufreq_cluster_info {
>> @@ -91,10 +92,39 @@ static int tegra186_cpufreq_set_target(struct cpufreq_policy *policy,
>>  	return 0;
>>  }
>>  
>> +static unsigned int tegra186_cpufreq_get(unsigned int cpu)
>> +{
>> +	struct cpufreq_frequency_table *tbl;
>> +	struct cpufreq_policy *policy;
>> +	void __iomem *edvd_reg;
>> +	unsigned int i, freq = 0;
>> +	u32 ndiv;
>> +
>> +	policy = cpufreq_cpu_get(cpu);
>> +	if (!policy)
>> +		return -EINVAL;
> 
> This should be return 0;
> 
> Applied with that change. Thanks.


OK, thanks!

Jon

-- 
nvpublic