devfreq: rockchip: dmc: support sharing regulator with other devices

If the regulator is shared between several devices then the lowest
request voltage that meets the system constraints will be used.

Change-Id: I9645f3f81004c7203769a92367513d9d177504b2
Signed-off-by: Finley Xiao <finley.xiao@rock-chips.com>

diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
index c178b808ca806c4f421b25018e29f7c292bbe59a..9020bd3406ad7ca2961948b339fb03ee2c4b3795 100644 (file)
--- a/drivers/devfreq/rk3399_dmc.c
+++ b/drivers/devfreq/rk3399_dmc.c
@@ -111,7 +111,7 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
                if (dmcfreq->volt == target_volt)
                        return 0;
                err = regulator_set_voltage(dmcfreq->vdd_center, target_volt,
-                                           target_volt);
+                                           INT_MAX);
                if (err) {
                        dev_err(dev, "Cannot to set voltage %lu uV\n",
                                target_volt);
@@ -128,7 +128,7 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
         */
        if (old_clk_rate < target_rate) {
                err = regulator_set_voltage(dmcfreq->vdd_center, target_volt,
-                                           target_volt);
+                                           INT_MAX);
                if (err) {
                        dev_err(dev, "Cannot to set voltage %lu uV\n",
                                target_volt);
@@ -141,7 +141,7 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
                dev_err(dev, "Cannot to set frequency %lu (%d)\n",
                        target_rate, err);
                regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt,
-                                     dmcfreq->volt);
+                                     INT_MAX);
                goto out;
        }
 
@@ -158,11 +158,11 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
                dev_err(dev, "Get wrong ddr frequency, Request frequency %lu,\
                        Current frequency %lu\n", target_rate, dmcfreq->rate);
                regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt,
-                                     dmcfreq->volt);
+                                     INT_MAX);
                goto out;
        } else if (old_clk_rate > target_rate) {
                err = regulator_set_voltage(dmcfreq->vdd_center, target_volt,
-                                           target_volt);
+                                           INT_MAX);
                if (err) {
                        dev_err(dev, "Cannot to set vol %lu uV\n", target_volt);
                        goto out;