diff options
Diffstat (limited to 'extras/recipes-kernel/linux/linux-omap/dvfs/0010-OMAP-Voltage-layer-changes-to-support-DVFS.patch')
| -rw-r--r-- | extras/recipes-kernel/linux/linux-omap/dvfs/0010-OMAP-Voltage-layer-changes-to-support-DVFS.patch | 134 |
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 + |