From: Finley Xiao <finley.xiao@rock-chips.com>
Date: Mon, 28 Nov 2016 11:44:36 +0000 (+0800)
Subject: devfreq: rockchip: dmc: support sharing regulator with other devices
X-Git-Tag: firefly_0821_release~1204
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=55d7dcc796ab182555d4ad3b4eb91a611fb1400f;p=firefly-linux-kernel-4.4.55.git

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 c178b808ca80..9020bd3406ad 100644
--- 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;