[CPUFREQ] S5PV210: Adjust udelay prior to voltage scaling down

Voltage scaling accesses the MAX8998 regulators over bit-banged I2C
with lots of udelays.  In the case of decreasing CPU speed, the
number of loops per us for udelay needs to be adjusted prior to
decreasing voltage to avoid delaying for up to 10X too long.

Signed-off-by: Todd Poynor <toddpoynor@google.com>
Signed-off-by: Jonghwan Choi <jhbird.choi@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Dave Jones <davej@redhat.com>

diff --git a/drivers/cpufreq/s5pv210-cpufreq.c b/drivers/cpufreq/s5pv210-cpufreq.c
index 7fba356d27297a7ecdfd387e0d5e6f9445784ef9..155242cfc71439faeafdc16eb779c8c4a8987f63 100644 (file)
--- a/drivers/cpufreq/s5pv210-cpufreq.c
+++ b/drivers/cpufreq/s5pv210-cpufreq.c
@@ -467,6 +467,8 @@ static int s5pv210_target(struct cpufreq_policy *policy,
                }
        }
 
+       cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+
        if (freqs.new < freqs.old) {
                regulator_set_voltage(int_regulator,
                                int_volt, int_volt_max);
@@ -475,8 +477,6 @@ static int s5pv210_target(struct cpufreq_policy *policy,
                                arm_volt, arm_volt_max);
        }
 
-       cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
-
        printk(KERN_DEBUG "Perf changed[L%d]\n", index);
 
 exit: