On 12-07-20, 11:06, 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
>
> Although we could fix this by adding a 'get' operator for the Tegra186
> CPUFREQ driver, there is really little point because the CPUFREQ on
> Tegra186 is set by writing a value stored in the frequency table to a
> register and we just need to set the initial frequency.
The hardware still runs at the frequency requested by cpufreq core here, right ?
It is better to provide the get() callback as it is also used to show the
current frequency in userspace.
> So for Tegra186
> the simplest way to fix this is read the register that sets the
> frequency for each CPU and set the initial frequency when initialising
> the CPUFREQ driver.
>
> Signed-off-by: Jon Hunter <[email protected]>
> ---
> drivers/cpufreq/tegra186-cpufreq.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/cpufreq/tegra186-cpufreq.c
> b/drivers/cpufreq/tegra186-cpufreq.c
> index 3d2f143748ef..c44190ce3f03 100644
> --- a/drivers/cpufreq/tegra186-cpufreq.c
> +++ b/drivers/cpufreq/tegra186-cpufreq.c
> @@ -59,6 +59,7 @@ static int tegra186_cpufreq_init(struct cpufreq_policy
> *policy)
> struct tegra186_cpufreq_cluster *cluster = &data->clusters[i];
> const struct tegra186_cpufreq_cluster_info *info =
> cluster->info;
> + u32 edvd_val;
> int core;
>
> for (core = 0; core < ARRAY_SIZE(info->cpus); core++) {
> @@ -71,6 +72,13 @@ static int tegra186_cpufreq_init(struct cpufreq_policy
> *policy)
> policy->driver_data =
> data->regs + info->offset + EDVD_CORE_VOLT_FREQ(core);
> policy->freq_table = cluster->table;
> +
> + edvd_val = readl(policy->driver_data);
> +
> + for (i = 0; cluster->table[i].frequency != CPUFREQ_TABLE_END;
> i++) {
> + if (cluster->table[i].driver_data == edvd_val)
> + policy->cur = cluster->table[i].frequency;
> + }
> break;
> }
>
> --
> 2.17.1
--
viresh
