[PATCH] drm: msm: dsi: Don't attempt changing voltage of switches

[Bjorn Andersson]

In some configurations the supplies are voltage switches and not LDOs,
making the set voltage call to fail. Check with the regulator framework
if the supply can change voltage before attempting.

Signed-off-by: Bjorn Andersson <bjorn.andersson at sonymobile.com>
---
 drivers/gpu/drm/msm/dsi/dsi_host.c    | 2 +-
 drivers/gpu/drm/msm/dsi/phy/dsi_phy.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c 
b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 8c16d6a3ca78..ece3de6a8157 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -278,7 +278,7 @@ static int dsi_regulator_init(struct msm_dsi_host *msm_host)
        }

        for (i = 0; i < num; i++) {
-               if ((regs[i].min_voltage >= 0) && (regs[i].max_voltage >= 0)) {
+               if (regulator_can_change_voltage(s[i].consumer)) {
                        ret = regulator_set_voltage(s[i].consumer,
                                regs[i].min_voltage, regs[i].max_voltage);
                        if (ret < 0) {
diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c 
b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
index 401ff58d6893..f1f955f571fa 100644
--- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
+++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
@@ -178,7 +178,7 @@ static int dsi_phy_regulator_init(struct msm_dsi_phy *phy)
        }

        for (i = 0; i < num; i++) {
-               if ((regs[i].min_voltage >= 0) && (regs[i].max_voltage >= 0)) {
+               if (regulator_can_change_voltage(s[i].consumer)) {
                        ret = regulator_set_voltage(s[i].consumer,
                                regs[i].min_voltage, regs[i].max_voltage);
                        if (ret < 0) {
-- 
1.8.2.2