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Commit 42daffd2 authored by Afzal Mohammed's avatar Afzal Mohammed Committed by Kevin Hilman
Browse files

cpufreq: OMAP: specify range for voltage scaling 



Specify voltage in ranges for regulator. Range
used is tolerance specified for OPP.

This helps to achieve DVFS with a wider range of
regulators.

Cc: Kevin Hilman <khilman@ti.com>
Cc: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: default avatarAfzal Mohammed <afzal@ti.com>
parent 53dfe8a8

drivers/cpufreq/omap-cpufreq.c

+7 −3
Original line number Diff line number Diff line
@@ -38,6 +38,9 @@ 


#include <mach/hardware.h>



/* OPP tolerance in percentage */

#define	OPP_TOLERANCE	4



#ifdef CONFIG_SMP

struct lpj_info {

	unsigned long	ref;
@@ -81,7 +84,7 @@ static int omap_target(struct cpufreq_policy *policy, 
	int r, ret = 0;

	struct cpufreq_freqs freqs;

	struct opp *opp;

	unsigned long freq, volt = 0, volt_old = 0;

	unsigned long freq, volt = 0, volt_old = 0, tol = 0;



	if (!freq_table) {

		dev_err(mpu_dev, "%s: cpu%d: no freq table!\n", __func__,
@@ -125,6 +128,7 @@ static int omap_target(struct cpufreq_policy *policy, 
			return -EINVAL;

		}

		volt = opp_get_voltage(opp);

		tol = volt * OPP_TOLERANCE / 100;

		volt_old = regulator_get_voltage(mpu_reg);

	}
@@ -134,7 +138,7 @@ static int omap_target(struct cpufreq_policy *policy, 


	/* scaling up?  scale voltage before frequency */

	if (mpu_reg && (freqs.new > freqs.old)) {

		r = regulator_set_voltage(mpu_reg, volt, volt);

		r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);

		if (r < 0) {

			dev_warn(mpu_dev, "%s: unable to scale voltage up.\n",

				 __func__);
@@ -147,7 +151,7 @@ static int omap_target(struct cpufreq_policy *policy, 


	/* scaling down?  scale voltage after frequency */

	if (mpu_reg && (freqs.new < freqs.old)) {

		r = regulator_set_voltage(mpu_reg, volt, volt);

		r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);

		if (r < 0) {

			dev_warn(mpu_dev, "%s: unable to scale voltage down.\n",

				 __func__);