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> linux-2.6-dvfs-0024-OMAP3-cpufreq-driver-changes-for-DVFS-support.patch
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File linux-2.6-dvfs-0024-OMAP3-cpufreq-driver-changes-for-DVFS-support.patch of Package kernel-adaptation-n900
From 18d5c94ba15f56c91ddd297ca6970dfbaa2160ab Mon Sep 17 00:00:00 2001 From: Vishwanath BS <vishwanath.bs@ti.com> Date: Fri, 21 Jan 2011 19:31:00 +0530 Subject: [PATCH 24/32] OMAP3: cpufreq driver changes for DVFS support Changes in the omap cpufreq driver for DVFS support. Signed-off-by: Vishwanath BS <vishwanath.bs@ti.com> Cc: Santosh Shilimkar <santosh.shilimkar@ti.com> --- arch/arm/plat-omap/cpu-omap.c | 35 ++++++++++++++++++++++++++++++++--- 1 files changed, 32 insertions(+), 3 deletions(-) diff --git a/arch/arm/plat-omap/cpu-omap.c b/arch/arm/plat-omap/cpu-omap.c index 1c1b80b..d965220 100644 --- a/arch/arm/plat-omap/cpu-omap.c +++ b/arch/arm/plat-omap/cpu-omap.c @@ -30,10 +30,12 @@ #include <mach/hardware.h> #include <plat/clock.h> #include <asm/system.h> +#include <asm/cpu.h> #if defined(CONFIG_ARCH_OMAP3) && !defined(CONFIG_OMAP_PM_NONE) #include <plat/omap-pm.h> #include <plat/common.h> +#include <plat/dvfs.h> #endif #define VERY_HI_RATE 900000000 @@ -85,11 +87,11 @@ static int omap_target(struct cpufreq_policy *policy, unsigned int target_freq, unsigned int relation) { -#ifdef CONFIG_ARCH_OMAP1 struct cpufreq_freqs freqs; -#endif #if defined(CONFIG_ARCH_OMAP3) && !defined(CONFIG_OMAP_PM_NONE) unsigned long freq; + int i; + struct cpufreq_freqs freqs_notify; struct device *mpu_dev = omap2_get_mpuss_device(); #endif int ret = 0; @@ -116,9 +118,36 @@ static int omap_target(struct cpufreq_policy *policy, ret = clk_set_rate(mpu_clk, freqs.new * 1000); cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); #elif defined(CONFIG_ARCH_OMAP3) && !defined(CONFIG_OMAP_PM_NONE) + freqs.old = omap_getspeed(policy->cpu);; + freqs_notify.new = clk_round_rate(mpu_clk, target_freq * 1000) / 1000; + freqs.cpu = policy->cpu; + + if (freqs.old == freqs.new) + return ret; + + /* pre notifiers */ + for_each_cpu(i, policy->cpus) { + freqs.cpu = i; + cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); + } + + /* scale the frequency */ freq = target_freq * 1000; if (opp_find_freq_ceil(mpu_dev, &freq)) - omap_pm_cpu_set_freq(freq); + omap_device_scale(mpu_dev, mpu_dev, freq); + + /* Update loops per jiffy */ + freqs.new = omap_getspeed(policy->cpu); + for_each_cpu(i, policy->cpus) + per_cpu(cpu_data, i).loops_per_jiffy = + cpufreq_scale(per_cpu(cpu_data, i).loops_per_jiffy, + freqs.old, freqs.new); + + /* post notifiers */ + for_each_cpu(i, policy->cpus) { + freqs.cpu = i; + cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); + } #endif return ret; } -- 1.7.0.4