| Message ID | 1602668171-30104-1-git-send-email-sumitg@nvidia.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v3] cpufreq: tegra194: get consistent cpuinfo_cur_freq | expand |
Ping. > > Frequency returned by 'cpuinfo_cur_freq' using counters is not fixed > and keeps changing slightly. This change returns a consistent value > from freq_table. If the reconstructed frequency has acceptable delta > from the last written value, then return the frequency corresponding > to the last written ndiv value from freq_table. Otherwise, print a > warning and return the reconstructed freq. > > Signed-off-by: Sumit Gupta <sumitg@nvidia.com> > --- > > Sending only this patch as other patch not required after the change > to convert 'pr_warn' to 'pr_info' in cpufreq core for unlisted freq. > Changelog > v1[2] -> v3: > - Removed unwanted checks for cpu_online and max cluster number > - Used WARN_ON_ONCE to avoid print flooding. > > v1[1] -> v2: > - Minor changes to improve comments and reduce debug prints. > - Get freq table from cluster specific data instead of policy. > > [2] https://marc.info/?l=linux-tegra&m=160216218511280&w=2 > [1] https://marc.info/?l=linux-arm-kernel&m=160028821117535&w=2 > > drivers/cpufreq/tegra194-cpufreq.c | 62 ++++++++++++++++++++++++++++++++------ > 1 file changed, 53 insertions(+), 9 deletions(-) > > diff --git a/drivers/cpufreq/tegra194-cpufreq.c b/drivers/cpufreq/tegra194-cpufreq.c > index e1d931c..7901587 100644 > --- a/drivers/cpufreq/tegra194-cpufreq.c > +++ b/drivers/cpufreq/tegra194-cpufreq.c > @@ -180,9 +180,61 @@ static unsigned int tegra194_get_speed_common(u32 cpu, u32 delay) > return (rate_mhz * KHZ); /* in KHz */ > } > > +static void get_cpu_ndiv(void *ndiv) > +{ > + u64 ndiv_val; > + > + asm volatile("mrs %0, s3_0_c15_c0_4" : "=r" (ndiv_val) : ); > + > + *(u64 *)ndiv = ndiv_val; > +} > + > +static void set_cpu_ndiv(void *data) > +{ > + struct cpufreq_frequency_table *tbl = data; > + u64 ndiv_val = (u64)tbl->driver_data; > + > + asm volatile("msr s3_0_c15_c0_4, %0" : : "r" (ndiv_val)); > +} > + > static unsigned int tegra194_get_speed(u32 cpu) > { > - return tegra194_get_speed_common(cpu, US_DELAY); > + struct tegra194_cpufreq_data *data = cpufreq_get_driver_data(); > + struct cpufreq_frequency_table *pos; > + unsigned int rate; > + u64 ndiv; > + int ret; > + u32 cl; > + > + smp_call_function_single(cpu, get_cpu_cluster, &cl, true); > + > + /* reconstruct actual cpu freq using counters */ > + rate = tegra194_get_speed_common(cpu, US_DELAY); > + > + /* get last written ndiv value */ > + ret = smp_call_function_single(cpu, get_cpu_ndiv, &ndiv, true); > + if (WARN_ON_ONCE(ret)) > + return rate; > + > + /* > + * If the reconstructed frequency has acceptable delta from > + * the last written value, then return freq corresponding > + * to the last written ndiv value from freq_table. This is > + * done to return consistent value. > + */ > + cpufreq_for_each_valid_entry(pos, data->tables[cl]) { > + if (pos->driver_data != ndiv) > + continue; > + > + if (abs(pos->frequency - rate) > 115200) { > + pr_warn("cpufreq: cpu%d,cur:%u,set:%u,set ndiv:%llu\n", > + cpu, rate, pos->frequency, ndiv); > + } else { > + rate = pos->frequency; > + } > + break; > + } > + return rate; > } > > static int tegra194_cpufreq_init(struct cpufreq_policy *policy) > @@ -209,14 +261,6 @@ static int tegra194_cpufreq_init(struct cpufreq_policy *policy) > return 0; > } > > -static void set_cpu_ndiv(void *data) > -{ > - struct cpufreq_frequency_table *tbl = data; > - u64 ndiv_val = (u64)tbl->driver_data; > - > - asm volatile("msr s3_0_c15_c0_4, %0" : : "r" (ndiv_val)); > -} > - > static int tegra194_cpufreq_set_target(struct cpufreq_policy *policy, > unsigned int index) > { > -- > 2.7.4 >
On 27-10-20, 11:46, Sumit Gupta wrote:
> Ping.
I was waiting for 5.10-rc1 to be released before I can start applying stuff for
5.11. Now that it is released, I will apply this.
Thank you. On 27/10/20 12:28 PM, Viresh Kumar wrote: > External email: Use caution opening links or attachments > > > On 27-10-20, 11:46, Sumit Gupta wrote: >> Ping. > > I was waiting for 5.10-rc1 to be released before I can start applying stuff for > 5.11. Now that it is released, I will apply this. > > -- > viresh >
On 14-10-20, 15:06, Sumit Gupta wrote: > Frequency returned by 'cpuinfo_cur_freq' using counters is not fixed > and keeps changing slightly. This change returns a consistent value > from freq_table. If the reconstructed frequency has acceptable delta > from the last written value, then return the frequency corresponding > to the last written ndiv value from freq_table. Otherwise, print a > warning and return the reconstructed freq. > > Signed-off-by: Sumit Gupta <sumitg@nvidia.com> > --- > > Sending only this patch as other patch not required after the change > to convert 'pr_warn' to 'pr_info' in cpufreq core for unlisted freq. > Changelog > v1[2] -> v3: > - Removed unwanted checks for cpu_online and max cluster number > - Used WARN_ON_ONCE to avoid print flooding. > > v1[1] -> v2: > - Minor changes to improve comments and reduce debug prints. > - Get freq table from cluster specific data instead of policy. > > [2] https://marc.info/?l=linux-tegra&m=160216218511280&w=2 > [1] https://marc.info/?l=linux-arm-kernel&m=160028821117535&w=2 > > drivers/cpufreq/tegra194-cpufreq.c | 62 ++++++++++++++++++++++++++++++++------ > 1 file changed, 53 insertions(+), 9 deletions(-) Applied. Thanks.
diff --git a/drivers/cpufreq/tegra194-cpufreq.c b/drivers/cpufreq/tegra194-cpufreq.c index e1d931c..7901587 100644 --- a/drivers/cpufreq/tegra194-cpufreq.c +++ b/drivers/cpufreq/tegra194-cpufreq.c @@ -180,9 +180,61 @@ static unsigned int tegra194_get_speed_common(u32 cpu, u32 delay) return (rate_mhz * KHZ); /* in KHz */ } +static void get_cpu_ndiv(void *ndiv) +{ + u64 ndiv_val; + + asm volatile("mrs %0, s3_0_c15_c0_4" : "=r" (ndiv_val) : ); + + *(u64 *)ndiv = ndiv_val; +} + +static void set_cpu_ndiv(void *data) +{ + struct cpufreq_frequency_table *tbl = data; + u64 ndiv_val = (u64)tbl->driver_data; + + asm volatile("msr s3_0_c15_c0_4, %0" : : "r" (ndiv_val)); +} + static unsigned int tegra194_get_speed(u32 cpu) { - return tegra194_get_speed_common(cpu, US_DELAY); + struct tegra194_cpufreq_data *data = cpufreq_get_driver_data(); + struct cpufreq_frequency_table *pos; + unsigned int rate; + u64 ndiv; + int ret; + u32 cl; + + smp_call_function_single(cpu, get_cpu_cluster, &cl, true); + + /* reconstruct actual cpu freq using counters */ + rate = tegra194_get_speed_common(cpu, US_DELAY); + + /* get last written ndiv value */ + ret = smp_call_function_single(cpu, get_cpu_ndiv, &ndiv, true); + if (WARN_ON_ONCE(ret)) + return rate; + + /* + * If the reconstructed frequency has acceptable delta from + * the last written value, then return freq corresponding + * to the last written ndiv value from freq_table. This is + * done to return consistent value. + */ + cpufreq_for_each_valid_entry(pos, data->tables[cl]) { + if (pos->driver_data != ndiv) + continue; + + if (abs(pos->frequency - rate) > 115200) { + pr_warn("cpufreq: cpu%d,cur:%u,set:%u,set ndiv:%llu\n", + cpu, rate, pos->frequency, ndiv); + } else { + rate = pos->frequency; + } + break; + } + return rate; } static int tegra194_cpufreq_init(struct cpufreq_policy *policy) @@ -209,14 +261,6 @@ static int tegra194_cpufreq_init(struct cpufreq_policy *policy) return 0; } -static void set_cpu_ndiv(void *data) -{ - struct cpufreq_frequency_table *tbl = data; - u64 ndiv_val = (u64)tbl->driver_data; - - asm volatile("msr s3_0_c15_c0_4, %0" : : "r" (ndiv_val)); -} - static int tegra194_cpufreq_set_target(struct cpufreq_policy *policy, unsigned int index) {
Frequency returned by 'cpuinfo_cur_freq' using counters is not fixed and keeps changing slightly. This change returns a consistent value from freq_table. If the reconstructed frequency has acceptable delta from the last written value, then return the frequency corresponding to the last written ndiv value from freq_table. Otherwise, print a warning and return the reconstructed freq. Signed-off-by: Sumit Gupta <sumitg@nvidia.com> --- Sending only this patch as other patch not required after the change to convert 'pr_warn' to 'pr_info' in cpufreq core for unlisted freq. Changelog v1[2] -> v3: - Removed unwanted checks for cpu_online and max cluster number - Used WARN_ON_ONCE to avoid print flooding. v1[1] -> v2: - Minor changes to improve comments and reduce debug prints. - Get freq table from cluster specific data instead of policy. [2] https://marc.info/?l=linux-tegra&m=160216218511280&w=2 [1] https://marc.info/?l=linux-arm-kernel&m=160028821117535&w=2 drivers/cpufreq/tegra194-cpufreq.c | 62 ++++++++++++++++++++++++++++++++------ 1 file changed, 53 insertions(+), 9 deletions(-)