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: Afzal Mohammed <afzal@ti.com>
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@ -38,6 +38,9 @@
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#include <mach/hardware.h>
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/* OPP tolerance in percentage */
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#define OPP_TOLERANCE 4
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#ifdef CONFIG_SMP
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struct lpj_info {
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unsigned long ref;
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@ -81,7 +84,7 @@ static int omap_target(struct cpufreq_policy *policy,
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int r, ret = 0;
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struct cpufreq_freqs freqs;
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struct opp *opp;
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unsigned long freq, volt = 0, volt_old = 0;
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unsigned long freq, volt = 0, volt_old = 0, tol = 0;
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if (!freq_table) {
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dev_err(mpu_dev, "%s: cpu%d: no freq table!\n", __func__,
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@ -125,6 +128,7 @@ static int omap_target(struct cpufreq_policy *policy,
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return -EINVAL;
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}
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volt = opp_get_voltage(opp);
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tol = volt * OPP_TOLERANCE / 100;
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volt_old = regulator_get_voltage(mpu_reg);
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}
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@ -134,7 +138,7 @@ static int omap_target(struct cpufreq_policy *policy,
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/* scaling up? scale voltage before frequency */
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if (mpu_reg && (freqs.new > freqs.old)) {
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r = regulator_set_voltage(mpu_reg, volt, volt);
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r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);
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if (r < 0) {
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dev_warn(mpu_dev, "%s: unable to scale voltage up.\n",
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__func__);
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@ -147,7 +151,7 @@ static int omap_target(struct cpufreq_policy *policy,
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/* scaling down? scale voltage after frequency */
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if (mpu_reg && (freqs.new < freqs.old)) {
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r = regulator_set_voltage(mpu_reg, volt, volt);
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r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);
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if (r < 0) {
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dev_warn(mpu_dev, "%s: unable to scale voltage down.\n",
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__func__);
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