1 files changed, 134 insertions, 0 deletions

diff --git a/extras/recipes-kernel/linux/linux-omap/dvfs/0010-OMAP-Voltage-layer-changes-to-support-DVFS.patch b/extras/recipes-kernel/linux/linux-omap/dvfs/0010-OMAP-Voltage-layer-changes-to-support-DVFS.patch
new file mode 100644
index 00000000..ead9cbba
--- /dev/null
+++ b/extras/recipes-kernel/linux/linux-omap/dvfs/0010-OMAP-Voltage-layer-changes-to-support-DVFS.patch
@@ -0,0 +1,134 @@
+From 96ee5b07e3162056169689b363f4c0edae7d7303 Mon Sep 17 00:00:00 2001
+From: Thara Gopinath <thara@ti.com>
+Date: Fri, 29 Oct 2010 20:43:34 +0530
+Subject: [PATCH 10/20] OMAP: Voltage layer changes to support DVFS.
+
+This patch introduces an API to take in the voltage domain and the
+new voltage as parameter and to scale all the scalable devices
+associated with the the voltage domain to the rate corresponding to the
+new voltage and scale the voltage domain to the new voltage.
+
+Signed-off-by: Thara Gopinath <thara@ti.com>
+---
+ arch/arm/mach-omap2/voltage.c             |   69 +++++++++++++++++++++++++++++
+ arch/arm/plat-omap/include/plat/voltage.h |    7 +++
+ 2 files changed, 76 insertions(+), 0 deletions(-)
+
+diff --git a/arch/arm/mach-omap2/voltage.c b/arch/arm/mach-omap2/voltage.c
+index 7381fa6..9adf9d1 100644
+--- a/arch/arm/mach-omap2/voltage.c
++++ b/arch/arm/mach-omap2/voltage.c
+@@ -27,9 +27,11 @@
+ #include <linux/spinlock.h>
+ #include <linux/plist.h>
+ #include <linux/slab.h>
++#include <linux/opp.h>
+ 
+ #include <plat/common.h>
+ #include <plat/voltage.h>
++#include <plat/omap_device.h>
+ 
+ #include "prm-regbits-34xx.h"
+ #include "prm-regbits-44xx.h"
+@@ -1656,6 +1658,73 @@ struct voltagedomain *omap_voltage_domain_lookup(char *name)
+ }
+ 
+ /**
++ * omap_voltage_scale : API to scale the devices associated with a
++ *                     voltage domain vdd voltage.
++ * @volt_domain : the voltage domain to be scaled
++ * @volt : the new voltage for the voltage domain
++ *
++ * This API runs through the list of devices associated with the
++ * voltage domain and scales the device rates to those corresponding
++ * to the new voltage of the voltage domain. This API also scales
++ * the voltage domain voltage to the new value. Returns 0 on success
++ * else the error value.
++ */
++int omap_voltage_scale(struct voltagedomain *voltdm, unsigned long volt)
++{
++       unsigned long curr_volt;
++       int is_volt_scaled = 0;
++       struct omap_vdd_info *vdd;
++       struct omap_vdd_dev_list *temp_dev;
++
++       if (!voltdm || IS_ERR(voltdm)) {
++               pr_warning("%s: VDD specified does not exist!\n", __func__);
++               return -EINVAL;
++       }
++
++       vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
++
++       mutex_lock(&vdd->scaling_mutex);
++
++       curr_volt = omap_voltage_get_nom_volt(voltdm);
++
++       if (curr_volt == volt) {
++               is_volt_scaled = 1;
++       } else if (curr_volt < volt) {
++               omap_voltage_scale_vdd(voltdm, volt);
++               is_volt_scaled = 1;
++       }
++
++       list_for_each_entry(temp_dev, &vdd->dev_list, node) {
++               struct device *dev;
++               struct opp *opp;
++               unsigned long freq;
++
++               dev = temp_dev->dev;
++
++               opp = opp_find_voltage(dev, volt);
++               if (IS_ERR(opp))
++                       continue;
++
++               freq = opp_get_freq(opp);
++
++               if (freq == omap_device_get_rate(dev)) {
++                       dev_warn(dev, "%s: Already at the requested"
++                               "rate %ld\n", __func__, freq);
++                       continue;
++               }
++
++               omap_device_set_rate(dev, freq);
++       }
++
++       if (!is_volt_scaled)
++               omap_voltage_scale_vdd(voltdm, volt);
++
++       mutex_unlock(&vdd->scaling_mutex);
++
++       return 0;
++}
++
++/**
+  * omap_voltage_late_init() - Init the various voltage parameters
+  *
+  * This API is to be called in the later stages of the
+diff --git a/arch/arm/plat-omap/include/plat/voltage.h b/arch/arm/plat-omap/include/plat/voltage.h
+index adbc6af..6782c5e 100644
+--- a/arch/arm/plat-omap/include/plat/voltage.h
++++ b/arch/arm/plat-omap/include/plat/voltage.h
+@@ -135,6 +135,7 @@ int omap_voltage_late_init(void);
+ int omap_voltage_add_request(struct voltagedomain *voltdm, struct device *dev,
+                unsigned long *volt);
+ int omap_voltage_add_dev(struct voltagedomain *voltdm, struct device *dev);
++int omap_voltage_scale(struct voltagedomain *voltdm, unsigned long volt);
+ #else
+ static inline int omap_voltage_register_pmic(struct voltagedomain *voltdm,
+                struct omap_volt_pmic_info *pmic_info) {}
+@@ -154,6 +155,12 @@ static inline int omap_voltage_add_dev(struct voltagedomain *voltdm,
+ {
+        return -EINVAL;
+ }
++
++static inline int omap_voltage_scale(struct voltagedomain *voltdm,
++               unsigned long volt)
++{
++       return -EINVAL;
++}
+ #endif
+ 
+ #endif
+-- 
+1.6.6.1
+