[PATCH v3 1/2] cpufreq / OPP: Allow boost frequency to be looked up from device tree

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



From: Thomas Abraham <thomas.ab@xxxxxxxxxxx>

Commit 6f19efc0 ("cpufreq: Add boost frequency support in core") adds
support for CPU boost mode. This patch adds support for finding available
boost frequencies from device tree and marking them as usable in boost mode.

Cc: Nishanth Menon <nm@xxxxxx>
Cc: Lukasz Majewski <l.majewski@xxxxxxxxxxx>
Signed-off-by: Thomas Abraham <thomas.ab@xxxxxxxxxxx>
---
 drivers/cpufreq/cpufreq_opp.c |   39 +++++++++++++++++++++++++++++++++++++++
 1 files changed, 39 insertions(+), 0 deletions(-)

diff --git a/drivers/cpufreq/cpufreq_opp.c b/drivers/cpufreq/cpufreq_opp.c
index c0c6f4a..e3c97f3 100644
--- a/drivers/cpufreq/cpufreq_opp.c
+++ b/drivers/cpufreq/cpufreq_opp.c
@@ -19,6 +19,7 @@
 #include <linux/pm_opp.h>
 #include <linux/rcupdate.h>
 #include <linux/slab.h>
+#include <linux/of.h>
 
 /**
  * dev_pm_opp_init_cpufreq_table() - create a cpufreq table for a device
@@ -51,6 +52,10 @@ int dev_pm_opp_init_cpufreq_table(struct device *dev,
 	struct cpufreq_frequency_table *freq_table = NULL;
 	int i, max_opps, ret = 0;
 	unsigned long rate;
+#ifdef CONFIG_CPU_FREQ_BOOST_SW
+	int j, len;
+	u32 *boost_freqs = NULL;
+#endif
 
 	rcu_read_lock();
 
@@ -82,6 +87,40 @@ int dev_pm_opp_init_cpufreq_table(struct device *dev,
 
 	*table = &freq_table[0];
 
+#ifdef CONFIG_CPU_FREQ_BOOST_SW
+	if (of_find_property(dev->of_node, "boost-frequency", &len)) {
+		if (len == 0 || (len & (sizeof(u32) - 1)) != 0) {
+			dev_err(dev, "%s: invalid boost frequency\n", __func__);
+			ret = -EINVAL;
+			goto out;
+		}
+
+		boost_freqs = kzalloc(len, GFP_KERNEL);
+		if (!boost_freqs) {
+			dev_warn(dev, "%s: no memory for boost freq table\n",
+					__func__);
+			ret = -ENOMEM;
+			goto out;
+		}
+		of_property_read_u32_array(dev->of_node, "boost-frequency",
+			boost_freqs, len / sizeof(u32));
+	}
+
+	for (j = 0; j < len / sizeof(u32) && boost_freqs; j++) {
+		for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
+			if (boost_freqs[j] == freq_table[i].frequency) {
+				freq_table[i].flags |= CPUFREQ_BOOST_FREQ;
+				break;
+			}
+		}
+		if (freq_table[i].frequency == CPUFREQ_TABLE_END)
+			pr_err("%s: invalid boost frequency %d\n",
+				__func__, boost_freqs[j]);
+	}
+
+	kfree(boost_freqs);
+#endif
+
 out:
 	rcu_read_unlock();
 	if (ret)
-- 
1.7.4.4

--
To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux SoC Development]     [Linux Rockchip Development]     [Linux USB Development]     [Video for Linux]     [Linux Audio Users]     [Linux SCSI]     [Yosemite News]

  Powered by Linux