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authorViresh Kumar <viresh.kumar@linaro.org>2013-10-25 18:15:48 +0400
committerRafael J. Wysocki <rjw@rjwysocki.net>2013-10-26 00:42:24 +0400
commit9c0ebcf78fde0ffa348a95a544c6d3f2dac5af65 (patch)
tree0aa1814b3cdbd6900a6494d8f0c56551d90cf693 /drivers/cpufreq/at32ap-cpufreq.c
parent6ddee424fea2d269c2f402278d93165c7b92dc58 (diff)
downloadlinux-9c0ebcf78fde0ffa348a95a544c6d3f2dac5af65.tar.xz
cpufreq: Implement light weight ->target_index() routine
Currently, the prototype of cpufreq_drivers target routines is: int target(struct cpufreq_policy *policy, unsigned int target_freq, unsigned int relation); And most of the drivers call cpufreq_frequency_table_target() to get a valid index of their frequency table which is closest to the target_freq. And they don't use target_freq and relation after that. So, it makes sense to just do this work in cpufreq core before calling cpufreq_frequency_table_target() and simply pass index instead. But this can be done only with drivers which expose their frequency table with cpufreq core. For others we need to stick with the old prototype of target() until those drivers are converted to expose frequency tables. This patch implements the new light weight prototype for target_index() routine. It looks like this: int target_index(struct cpufreq_policy *policy, unsigned int index); CPUFreq core will call cpufreq_frequency_table_target() before calling this routine and pass index to it. Because CPUFreq core now requires to call routines present in freq_table.c CONFIG_CPU_FREQ_TABLE must be enabled all the time. This also marks target() interface as deprecated. So, that new drivers avoid using it. And Documentation is updated accordingly. It also converts existing .target() to newly defined light weight .target_index() routine for many driver. Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Russell King <linux@arm.linux.org.uk> Acked-by: David S. Miller <davem@davemloft.net> Tested-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rjw@rjwysocki.net>
Diffstat (limited to 'drivers/cpufreq/at32ap-cpufreq.c')
-rw-r--r--drivers/cpufreq/at32ap-cpufreq.c23
1 files changed, 5 insertions, 18 deletions
diff --git a/drivers/cpufreq/at32ap-cpufreq.c b/drivers/cpufreq/at32ap-cpufreq.c
index 7439deddd5cf..81d07527bde6 100644
--- a/drivers/cpufreq/at32ap-cpufreq.c
+++ b/drivers/cpufreq/at32ap-cpufreq.c
@@ -35,25 +35,12 @@ static unsigned int at32_get_speed(unsigned int cpu)
static unsigned int ref_freq;
static unsigned long loops_per_jiffy_ref;
-static int at32_set_target(struct cpufreq_policy *policy,
- unsigned int target_freq,
- unsigned int relation)
+static int at32_set_target(struct cpufreq_policy *policy, unsigned int index)
{
struct cpufreq_freqs freqs;
- long freq;
-
- /* Convert target_freq from kHz to Hz */
- freq = clk_round_rate(cpuclk, target_freq * 1000);
-
- /* Check if policy->min <= new_freq <= policy->max */
- if(freq < (policy->min * 1000) || freq > (policy->max * 1000))
- return -EINVAL;
-
- pr_debug("cpufreq: requested frequency %u Hz\n", target_freq * 1000);
freqs.old = at32_get_speed(0);
- freqs.new = (freq + 500) / 1000;
- freqs.flags = 0;
+ freqs.new = freq_table[index].frequency;
if (!ref_freq) {
ref_freq = freqs.old;
@@ -64,13 +51,13 @@ static int at32_set_target(struct cpufreq_policy *policy,
if (freqs.old < freqs.new)
boot_cpu_data.loops_per_jiffy = cpufreq_scale(
loops_per_jiffy_ref, ref_freq, freqs.new);
- clk_set_rate(cpuclk, freq);
+ clk_set_rate(cpuclk, freqs.new * 1000);
if (freqs.new < freqs.old)
boot_cpu_data.loops_per_jiffy = cpufreq_scale(
loops_per_jiffy_ref, ref_freq, freqs.new);
cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
- pr_debug("cpufreq: set frequency %lu Hz\n", freq);
+ pr_debug("cpufreq: set frequency %u Hz\n", freqs.new * 1000);
return 0;
}
@@ -139,7 +126,7 @@ static struct cpufreq_driver at32_driver = {
.name = "at32ap",
.init = at32_cpufreq_driver_init,
.verify = cpufreq_generic_frequency_table_verify,
- .target = at32_set_target,
+ .target_index = at32_set_target,
.get = at32_get_speed,
.flags = CPUFREQ_STICKY,
};