From: Jaecheol Lee <jc.lee@xxxxxxxxxxx>
This patch is modify code for stable working
1. Remove unused register access code
2. Change sequence for frequency changing
Signed-off-by: Jaecheol Lee <jc.lee@xxxxxxxxxxx>
Signed-off-by: Jonghwan Choi <jhbird.choi@xxxxxxxxxxx>
Signed-off-by: Jongpill Lee <boyko.lee@xxxxxxxxxxx>
Signed-off-by: Kukjin Kim <kgene.kim@xxxxxxxxxxx>
---
drivers/cpufreq/exynos4210-cpufreq.c | 101 ++++++++++++++++++++++------------
1 files changed, 65 insertions(+), 36 deletions(-)
diff --git a/drivers/cpufreq/exynos4210-cpufreq.c b/drivers/cpufreq/exynos4210-cpufreq.c
index ba579e0..a0af2d4 100644
--- a/drivers/cpufreq/exynos4210-cpufreq.c
+++ b/drivers/cpufreq/exynos4210-cpufreq.c
@@ -36,6 +36,10 @@ static struct regulator *arm_regulator;
static struct cpufreq_freqs freqs;
+struct cpufreq_clkdiv {
+ unsigned int clkdiv;
+};
+
static unsigned int locking_frequency;
static bool frequency_locked;
static DEFINE_MUTEX(cpufreq_lock);
@@ -44,6 +48,8 @@ enum cpufreq_level_index {
L0, L1, L2, L3, L4, CPUFREQ_LEVEL_END,
};
+static struct cpufreq_clkdiv exynos4_clkdiv_table[CPUFREQ_LEVEL_END];
+
static struct cpufreq_frequency_table exynos4_freq_table[] = {
{L0, 1200*1000},
{L1, 1000*1000},
@@ -155,20 +161,7 @@ static void exynos4_set_clkdiv(unsigned int div_index)
/* Change Divider - CPU0 */
- tmp = __raw_readl(S5P_CLKDIV_CPU);
-
- tmp &= ~(S5P_CLKDIV_CPU0_CORE_MASK | S5P_CLKDIV_CPU0_COREM0_MASK |
- S5P_CLKDIV_CPU0_COREM1_MASK | S5P_CLKDIV_CPU0_PERIPH_MASK |
- S5P_CLKDIV_CPU0_ATB_MASK | S5P_CLKDIV_CPU0_PCLKDBG_MASK |
- S5P_CLKDIV_CPU0_APLL_MASK);
-
- tmp |= ((clkdiv_cpu0[div_index][0] << S5P_CLKDIV_CPU0_CORE_SHIFT) |
- (clkdiv_cpu0[div_index][1] << S5P_CLKDIV_CPU0_COREM0_SHIFT) |
- (clkdiv_cpu0[div_index][2] << S5P_CLKDIV_CPU0_COREM1_SHIFT) |
- (clkdiv_cpu0[div_index][3] << S5P_CLKDIV_CPU0_PERIPH_SHIFT) |
- (clkdiv_cpu0[div_index][4] << S5P_CLKDIV_CPU0_ATB_SHIFT) |
- (clkdiv_cpu0[div_index][5] << S5P_CLKDIV_CPU0_PCLKDBG_SHIFT) |
- (clkdiv_cpu0[div_index][6] << S5P_CLKDIV_CPU0_APLL_SHIFT));
+ tmp = exynos4_clkdiv_table[div_index].clkdiv;
__raw_writel(tmp, S5P_CLKDIV_CPU);
@@ -233,14 +226,12 @@ static void exynos4_set_frequency(unsigned int old_index, unsigned int new_index
unsigned int tmp;
if (old_index > new_index) {
- /* The frequency changing to L0 needs to change apll */
- if (freqs.new == exynos4_freq_table[L0].frequency) {
- /* 1. Change the system clock divider values */
- exynos4_set_clkdiv(new_index);
-
- /* 2. Change the apll m,p,s value */
- exynos4_set_apll(new_index);
- } else {
+ /*
+ * L1/L3, L2/L4 Level change require
+ * to only change s divider value
+ */
+ if (((old_index == L3) && (new_index == L1)) ||
+ ((old_index == L4) && (new_index == L2))) {
/* 1. Change the system clock divider values */
exynos4_set_clkdiv(new_index);
@@ -249,18 +240,20 @@ static void exynos4_set_frequency(unsigned int old_index, unsigned int new_index
tmp &= ~(0x7 << 0);
tmp |= (exynos4_apll_pms_table[new_index] & 0x7);
__raw_writel(tmp, S5P_APLL_CON0);
- }
- }
-
- else if (old_index < new_index) {
- /* The frequency changing from L0 needs to change apll */
- if (freqs.old == exynos4_freq_table[L0].frequency) {
- /* 1. Change the apll m,p,s value */
- exynos4_set_apll(new_index);
-
- /* 2. Change the system clock divider values */
- exynos4_set_clkdiv(new_index);
} else {
+ /* Clock Configuration Procedure */
+ /* 1. Change the system clock divider values */
+ exynos4_set_clkdiv(new_index);
+ /* 2. Change the apll m,p,s value */
+ exynos4_set_apll(new_index);
+ }
+ } else if (old_index < new_index) {
+ /*
+ * L1/L3, L2/L4 Level change require
+ * to only change s divider value
+ */
+ if (((old_index == L1) && (new_index == L3)) ||
+ ((old_index == L2) && (new_index == L4))) {
/* 1. Change just s value in apll m,p,s value */
tmp = __raw_readl(S5P_APLL_CON0);
tmp &= ~(0x7 << 0);
@@ -269,6 +262,12 @@ static void exynos4_set_frequency(unsigned int old_index, unsigned int new_index
/* 2. Change the system clock divider values */
exynos4_set_clkdiv(new_index);
+ } else {
+ /* Clock Configuration Procedure */
+ /* 1. Change the apll m,p,s value */
+ exynos4_set_apll(new_index);
+ /* 2. Change the system clock divider values */
+ exynos4_set_clkdiv(new_index);
}
}
}
@@ -320,14 +319,14 @@ static int exynos4_target(struct cpufreq_policy *policy,
/* Clock Configuration Procedure */
exynos4_set_frequency(old_index, index);
+ cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+
/* control regulator */
if (freqs.new < freqs.old) {
/* Voltage down */
regulator_set_voltage(arm_regulator, arm_volt, arm_volt);
}
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
-
out:
mutex_unlock(&cpufreq_lock);
return err;
@@ -438,7 +437,12 @@ static int exynos4_cpufreq_cpu_init(struct cpufreq_policy *policy)
* Each cpu is bound to the same speed.
* So the affected cpu is all of the cpus.
*/
- cpumask_setall(policy->cpus);
+ if (!cpu_online(1)) {
+ cpumask_copy(policy->related_cpus, cpu_possible_mask);
+ cpumask_copy(policy->cpus, cpu_online_mask);
+ } else {
+ cpumask_setall(policy->cpus);
+ }
ret = cpufreq_frequency_table_cpuinfo(policy, exynos4_freq_table);
if (ret)
@@ -477,6 +481,9 @@ static struct cpufreq_driver exynos4_driver = {
static int __init exynos4_cpufreq_init(void)
{
+ int i;
+ unsigned int tmp;
+
cpu_clk = clk_get(NULL, "armclk");
if (IS_ERR(cpu_clk))
return PTR_ERR(cpu_clk);
@@ -503,6 +510,28 @@ static int __init exynos4_cpufreq_init(void)
register_pm_notifier(&exynos4_cpufreq_nb);
+ tmp = __raw_readl(S5P_CLKDIV_CPU);
+
+ for (i = L0; i < CPUFREQ_LEVEL_END; i++) {
+ tmp &= ~(S5P_CLKDIV_CPU0_CORE_MASK |
+ S5P_CLKDIV_CPU0_COREM0_MASK |
+ S5P_CLKDIV_CPU0_COREM1_MASK |
+ S5P_CLKDIV_CPU0_PERIPH_MASK |
+ S5P_CLKDIV_CPU0_ATB_MASK |
+ S5P_CLKDIV_CPU0_PCLKDBG_MASK |
+ S5P_CLKDIV_CPU0_APLL_MASK);
+
+ tmp |= ((clkdiv_cpu0[i][0] << S5P_CLKDIV_CPU0_CORE_SHIFT) |
+ (clkdiv_cpu0[i][1] << S5P_CLKDIV_CPU0_COREM0_SHIFT) |
+ (clkdiv_cpu0[i][2] << S5P_CLKDIV_CPU0_COREM1_SHIFT) |
+ (clkdiv_cpu0[i][3] << S5P_CLKDIV_CPU0_PERIPH_SHIFT) |
+ (clkdiv_cpu0[i][4] << S5P_CLKDIV_CPU0_ATB_SHIFT) |
+ (clkdiv_cpu0[i][5] << S5P_CLKDIV_CPU0_PCLKDBG_SHIFT) |
+ (clkdiv_cpu0[i][6] << S5P_CLKDIV_CPU0_APLL_SHIFT));
+
+ exynos4_clkdiv_table[i].clkdiv = tmp;
+ }
+
return cpufreq_register_driver(&exynos4_driver);
out:
--
1.7.1
--
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