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authorKamil Konieczny <k.konieczny@partner.samsung.com>2019-08-07 16:38:36 +0300
committerMyungJoo Ham <myungjoo.ham@samsung.com>2019-08-25 06:46:48 +0300
commit4294a779bd8dff6c65e7e85ffe7a1ea236e92a68 (patch)
tree07cccfb3b8abca7f8cbe4d6520f34f1609b99f29 /drivers/devfreq
parent2c2b20e0da89c76759ee28c6824413ab2fa3bfc6 (diff)
downloadlinux-4294a779bd8dff6c65e7e85ffe7a1ea236e92a68.tar.xz
PM / devfreq: exynos-bus: Convert to use dev_pm_opp_set_rate()
Reuse opp core code for setting bus clock and voltage. As a side effect this allow usage of coupled regulators feature (required for boards using Exynos5422/5800 SoCs) because dev_pm_opp_set_rate() uses regulator_set_voltage_triplet() for setting regulator voltage while the old code used regulator_set_voltage_tol() with fixed tolerance. This patch also removes no longer needed parsing of DT property "exynos,voltage-tolerance" (no Exynos devfreq DT node uses it). After applying changes both functions exynos_bus_passive_target() and exynos_bus_target() have the same code, so remove exynos_bus_passive_target(). In exynos_bus_probe() replace it with exynos_bus_target. Signed-off-by: Kamil Konieczny <k.konieczny@partner.samsung.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Diffstat (limited to 'drivers/devfreq')
-rw-r--r--drivers/devfreq/exynos-bus.c130
1 files changed, 24 insertions, 106 deletions
diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
index 7c06df8bd74f..c832673273a2 100644
--- a/drivers/devfreq/exynos-bus.c
+++ b/drivers/devfreq/exynos-bus.c
@@ -22,7 +22,6 @@
#include <linux/slab.h>
#define DEFAULT_SATURATION_RATIO 40
-#define DEFAULT_VOLTAGE_TOLERANCE 2
struct exynos_bus {
struct device *dev;
@@ -34,9 +33,8 @@ struct exynos_bus {
unsigned long curr_freq;
- struct regulator *regulator;
+ struct opp_table *opp_table;
struct clk *clk;
- unsigned int voltage_tolerance;
unsigned int ratio;
};
@@ -90,62 +88,29 @@ static int exynos_bus_get_event(struct exynos_bus *bus,
}
/*
- * Must necessary function for devfreq simple-ondemand governor
+ * devfreq function for both simple-ondemand and passive governor
*/
static int exynos_bus_target(struct device *dev, unsigned long *freq, u32 flags)
{
struct exynos_bus *bus = dev_get_drvdata(dev);
struct dev_pm_opp *new_opp;
- unsigned long old_freq, new_freq, new_volt, tol;
int ret = 0;
- /* Get new opp-bus instance according to new bus clock */
+ /* Get correct frequency for bus. */
new_opp = devfreq_recommended_opp(dev, freq, flags);
if (IS_ERR(new_opp)) {
dev_err(dev, "failed to get recommended opp instance\n");
return PTR_ERR(new_opp);
}
- new_freq = dev_pm_opp_get_freq(new_opp);
- new_volt = dev_pm_opp_get_voltage(new_opp);
dev_pm_opp_put(new_opp);
- old_freq = bus->curr_freq;
-
- if (old_freq == new_freq)
- return 0;
- tol = new_volt * bus->voltage_tolerance / 100;
-
/* Change voltage and frequency according to new OPP level */
mutex_lock(&bus->lock);
+ ret = dev_pm_opp_set_rate(dev, *freq);
+ if (!ret)
+ bus->curr_freq = *freq;
- if (old_freq < new_freq) {
- ret = regulator_set_voltage_tol(bus->regulator, new_volt, tol);
- if (ret < 0) {
- dev_err(bus->dev, "failed to set voltage\n");
- goto out;
- }
- }
-
- ret = clk_set_rate(bus->clk, new_freq);
- if (ret < 0) {
- dev_err(dev, "failed to change clock of bus\n");
- clk_set_rate(bus->clk, old_freq);
- goto out;
- }
-
- if (old_freq > new_freq) {
- ret = regulator_set_voltage_tol(bus->regulator, new_volt, tol);
- if (ret < 0) {
- dev_err(bus->dev, "failed to set voltage\n");
- goto out;
- }
- }
- bus->curr_freq = new_freq;
-
- dev_dbg(dev, "Set the frequency of bus (%luHz -> %luHz, %luHz)\n",
- old_freq, new_freq, clk_get_rate(bus->clk));
-out:
mutex_unlock(&bus->lock);
return ret;
@@ -193,54 +158,10 @@ static void exynos_bus_exit(struct device *dev)
dev_pm_opp_of_remove_table(dev);
clk_disable_unprepare(bus->clk);
- if (bus->regulator)
- regulator_disable(bus->regulator);
-}
-
-/*
- * Must necessary function for devfreq passive governor
- */
-static int exynos_bus_passive_target(struct device *dev, unsigned long *freq,
- u32 flags)
-{
- struct exynos_bus *bus = dev_get_drvdata(dev);
- struct dev_pm_opp *new_opp;
- unsigned long old_freq, new_freq;
- int ret = 0;
-
- /* Get new opp-bus instance according to new bus clock */
- new_opp = devfreq_recommended_opp(dev, freq, flags);
- if (IS_ERR(new_opp)) {
- dev_err(dev, "failed to get recommended opp instance\n");
- return PTR_ERR(new_opp);
- }
-
- new_freq = dev_pm_opp_get_freq(new_opp);
- dev_pm_opp_put(new_opp);
-
- old_freq = bus->curr_freq;
-
- if (old_freq == new_freq)
- return 0;
-
- /* Change the frequency according to new OPP level */
- mutex_lock(&bus->lock);
-
- ret = clk_set_rate(bus->clk, new_freq);
- if (ret < 0) {
- dev_err(dev, "failed to set the clock of bus\n");
- goto out;
+ if (bus->opp_table) {
+ dev_pm_opp_put_regulators(bus->opp_table);
+ bus->opp_table = NULL;
}
-
- *freq = new_freq;
- bus->curr_freq = new_freq;
-
- dev_dbg(dev, "Set the frequency of bus (%luHz -> %luHz, %luHz)\n",
- old_freq, new_freq, clk_get_rate(bus->clk));
-out:
- mutex_unlock(&bus->lock);
-
- return ret;
}
static void exynos_bus_passive_exit(struct device *dev)
@@ -255,21 +176,19 @@ static int exynos_bus_parent_parse_of(struct device_node *np,
struct exynos_bus *bus)
{
struct device *dev = bus->dev;
+ struct opp_table *opp_table;
+ const char *vdd = "vdd";
int i, ret, count, size;
- /* Get the regulator to provide each bus with the power */
- bus->regulator = devm_regulator_get(dev, "vdd");
- if (IS_ERR(bus->regulator)) {
- dev_err(dev, "failed to get VDD regulator\n");
- return PTR_ERR(bus->regulator);
- }
-
- ret = regulator_enable(bus->regulator);
- if (ret < 0) {
- dev_err(dev, "failed to enable VDD regulator\n");
+ opp_table = dev_pm_opp_set_regulators(dev, &vdd, 1);
+ if (IS_ERR(opp_table)) {
+ ret = PTR_ERR(opp_table);
+ dev_err(dev, "failed to set regulators %d\n", ret);
return ret;
}
+ bus->opp_table = opp_table;
+
/*
* Get the devfreq-event devices to get the current utilization of
* buses. This raw data will be used in devfreq ondemand governor.
@@ -310,14 +229,11 @@ static int exynos_bus_parent_parse_of(struct device_node *np,
if (of_property_read_u32(np, "exynos,saturation-ratio", &bus->ratio))
bus->ratio = DEFAULT_SATURATION_RATIO;
- if (of_property_read_u32(np, "exynos,voltage-tolerance",
- &bus->voltage_tolerance))
- bus->voltage_tolerance = DEFAULT_VOLTAGE_TOLERANCE;
-
return 0;
err_regulator:
- regulator_disable(bus->regulator);
+ dev_pm_opp_put_regulators(bus->opp_table);
+ bus->opp_table = NULL;
return ret;
}
@@ -468,7 +384,7 @@ static int exynos_bus_probe(struct platform_device *pdev)
goto out;
passive:
/* Initialize the struct profile and governor data for passive device */
- profile->target = exynos_bus_passive_target;
+ profile->target = exynos_bus_target;
profile->exit = exynos_bus_passive_exit;
/* Get the instance of parent devfreq device */
@@ -508,8 +424,10 @@ err:
dev_pm_opp_of_remove_table(dev);
clk_disable_unprepare(bus->clk);
err_reg:
- if (!passive)
- regulator_disable(bus->regulator);
+ if (!passive) {
+ dev_pm_opp_put_regulators(bus->opp_table);
+ bus->opp_table = NULL;
+ }
return ret;
}