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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 /Documentation/cpu-freq/governors.txt
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 'Documentation/cpu-freq/governors.txt')
-rw-r--r--Documentation/cpu-freq/governors.txt4
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/cpu-freq/governors.txt b/Documentation/cpu-freq/governors.txt
index 219970ba54b7..77ec21574fb1 100644
--- a/Documentation/cpu-freq/governors.txt
+++ b/Documentation/cpu-freq/governors.txt
@@ -40,7 +40,7 @@ Most cpufreq drivers (in fact, all except one, longrun) or even most
cpu frequency scaling algorithms only offer the CPU to be set to one
frequency. In order to offer dynamic frequency scaling, the cpufreq
core must be able to tell these drivers of a "target frequency". So
-these specific drivers will be transformed to offer a "->target"
+these specific drivers will be transformed to offer a "->target/target_index"
call instead of the existing "->setpolicy" call. For "longrun", all
stays the same, though.
@@ -71,7 +71,7 @@ CPU can be set to switch independently | CPU can only be set
/ the limits of policy->{min,max}
/ \
/ \
- Using the ->setpolicy call, Using the ->target call,
+ Using the ->setpolicy call, Using the ->target/target_index call,
the limits and the the frequency closest
"policy" is set. to target_freq is set.
It is assured that it