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>

1 files changed, 4 insertions, 22 deletions

diff --git a/drivers/cpufreq/sa1110-cpufreq.c b/drivers/cpufreq/sa1110-cpufreq.c
index bca04c0b4a73..55b1818c3e49 100644
--- a/drivers/cpufreq/sa1110-cpufreq.c
+++ b/drivers/cpufreq/sa1110-cpufreq.c
@@ -229,34 +229,16 @@ sdram_update_refresh(u_int cpu_khz, struct sdram_params *sdram)
 /*
  * Ok, set the CPU frequency.
  */
-static int sa1110_target(struct cpufreq_policy *policy,
-                         unsigned int target_freq,
-                         unsigned int relation)
+static int sa1110_target(struct cpufreq_policy *policy, unsigned int ppcr)
 {
         struct sdram_params *sdram = &sdram_params;
         struct cpufreq_freqs freqs;
         struct sdram_info sd;
         unsigned long flags;
-        unsigned int ppcr, unused;
-
-        switch (relation) {
-        case CPUFREQ_RELATION_L:
-                ppcr = sa11x0_freq_to_ppcr(target_freq);
-                if (sa11x0_ppcr_to_freq(ppcr) > policy->max)
-                        ppcr--;
-                break;
-        case CPUFREQ_RELATION_H:
-                ppcr = sa11x0_freq_to_ppcr(target_freq);
-                if (ppcr && (sa11x0_ppcr_to_freq(ppcr) > target_freq) &&
-                    (sa11x0_ppcr_to_freq(ppcr-1) >= policy->min))
-                        ppcr--;
-                break;
-        default:
-                return -EINVAL;
-        }
+        unsigned int unused;
 
         freqs.old = sa11x0_getspeed(0);
-        freqs.new = sa11x0_ppcr_to_freq(ppcr);
+        freqs.new = sa11x0_freq_table[ppcr].frequency;
 
         sdram_calculate_timing(&sd, freqs.new, sdram);
 
@@ -340,7 +322,7 @@ static int __init sa1110_cpu_init(struct cpufreq_policy *policy)
 static struct cpufreq_driver sa1110_driver __refdata = {
         .flags          = CPUFREQ_STICKY,
         .verify         = cpufreq_generic_frequency_table_verify,
-        .target         = sa1110_target,
+        .target_index   = sa1110_target,
         .get            = sa11x0_getspeed,
         .init           = sa1110_cpu_init,
         .name           = "sa1110",