From: Huisung Kang <hs1218.kang@xxxxxxxxxxx>
Relation has an additional symantics other than standard.
s5pv310_target funtion have below additional relation.
- DISABLE_FURTHER_CPUFREQ : disable further access to target
- ENABLE_FURTHER_CPUFRER : enable access to target
Signed-off-by: Huisung Kang <hs1218.kang@xxxxxxxxxxx>
Signed-off-by: Jonghwan Choi <jhbird.choi@xxxxxxxxxxx>
Signed-off-by: Kukjin Kim <kgene.kim@xxxxxxxxxxx>
---
drivers/cpufreq/s5pv210-cpufreq.c | 28 ++++++++++++++++++++++++++++
1 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/drivers/cpufreq/s5pv210-cpufreq.c b/drivers/cpufreq/s5pv210-cpufreq.c
index a7cb338..48a4a90 100644
--- a/drivers/cpufreq/s5pv210-cpufreq.c
+++ b/drivers/cpufreq/s5pv210-cpufreq.c
@@ -30,6 +30,18 @@ static struct cpufreq_freqs freqs;
#define APLL_VAL_800 ((1 << 31) | (100 << 16) | (3 << 8) | 1)
/*
+ * relation has an additional symantics other than the standard of cpufreq
+ * DISALBE_FURTHER_CPUFREQ: disable further access to target
+ * ENABLE_FURTUER_CPUFREQ: enable access to target
+ */
+enum cpufreq_access {
+ DISABLE_FURTHER_CPUFREQ = 0x10,
+ ENABLE_FURTHER_CPUFREQ = 0x20,
+};
+
+static bool no_cpufreq_access;
+
+/*
* DRAM configurations to calculate refresh counter for changing
* frequency of memory.
*/
@@ -146,6 +158,22 @@ static int s5pv210_target(struct cpufreq_policy *policy,
unsigned int pll_changing = 0;
unsigned int bus_speed_changing = 0;
+ if (relation & ENABLE_FURTHER_CPUFREQ)
+ no_cpufreq_access = false;
+
+ if (no_cpufreq_access) {
+#ifdef CONFIG_PM_VERBOSE
+ pr_err("%s:%d denied access to %s as it is disabled"
+ "temporarily\n", __FILE__, __LINE__, __func__);
+#endif
+ return -EINVAL;
+ }
+
+ if (relation & DISABLE_FURTHER_CPUFREQ)
+ no_cpufreq_access = true;
+
+ relation &= ~(ENABLE_FURTHER_CPUFREQ | DISABLE_FURTHER_CPUFREQ);
+
freqs.old = s5pv210_getspeed(0);
if (cpufreq_frequency_table_target(policy, s5pv210_freq_table,
--
1.7.1
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