OMAPDSS: HDMI4: set regulator voltage to 1.8V

Set the HDMI vdda 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/hdmi4.c b/drivers/video/fbdev/omap2/dss/hdmi4.c
index e15b89d..5c7dd5c 100644 (file)
--- a/drivers/video/fbdev/omap2/dss/hdmi4.c
+++ b/drivers/video/fbdev/omap2/dss/hdmi4.c
@@ -83,6 +83,7 @@ static void hdmi_runtime_put(void)
 
 static int hdmi_init_regulator(void)
 {
+       int r;
        struct regulator *reg;
 
        if (hdmi.vdda_hdmi_dac_reg != NULL)
@@ -96,6 +97,15 @@ static int hdmi_init_regulator(void)
                return PTR_ERR(reg);
        }
 
+       if (regulator_can_change_voltage(reg)) {
+               r = regulator_set_voltage(reg, 1800000, 1800000);
+               if (r) {
+                       devm_regulator_put(reg);
+                       DSSWARN("can't set the regulator voltage\n");
+                       return r;
+               }
+       }
+
        hdmi.vdda_hdmi_dac_reg = reg;
 
        return 0;