OMAPDSS: DSI: set regulator voltage to 1.8V

Set the DSI vdd regulator voltage to the required 1.8V.

This is required for the case when the regulator in the DT data defines
a range of allowed voltages. In this case it's required to set the
voltage, as otherwise enabling the voltage fails.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

diff --git a/drivers/video/fbdev/omap2/dss/dsi.c b/drivers/video/fbdev/omap2/dss/dsi.c
index 8be9b04..57f1208 100644 (file)
--- a/drivers/video/fbdev/omap2/dss/dsi.c
+++ b/drivers/video/fbdev/omap2/dss/dsi.c
@@ -1161,6 +1161,7 @@ static int dsi_regulator_init(struct platform_device *dsidev)
 {
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        struct regulator *vdds_dsi;
+       int r;
 
        if (dsi->vdds_dsi_reg != NULL)
                return 0;
@@ -1173,6 +1174,15 @@ static int dsi_regulator_init(struct platform_device *dsidev)
                return PTR_ERR(vdds_dsi);
        }
 
+       if (regulator_can_change_voltage(vdds_dsi)) {
+               r = regulator_set_voltage(vdds_dsi, 1800000, 1800000);
+               if (r) {
+                       devm_regulator_put(vdds_dsi);
+                       DSSERR("can't set the DSI regulator voltage\n");
+                       return r;
+               }
+       }
+
        dsi->vdds_dsi_reg = vdds_dsi;
 
        return 0;