drm/imx: imx-tve: Do not set the regulator voltage

Commit deb65870b5d9d ("drm/imx: imx-tve: check the value returned by
regulator_set_voltage()") exposes the following probe issue:

63ff0000.tve supply dac not found, using dummy regulator
imx-drm display-subsystem: failed to bind 63ff0000.tve (ops imx_tve_ops): -22

When the 'dac-supply' is not passed in the device tree a dummy regulator is
used and setting its voltage is not allowed.

To fix this issue, do not set the dac-supply voltage inside the driver
and let its voltage be specified in the device tree.

Print a warning if the the 'dac-supply' voltage has a value different
from 2.75V.

Fixes: deb65870b5d9d ("drm/imx: imx-tve: check the value returned by regulator_set_voltage()")
Cc: <stable@vger.kernel.org> # 4.8+
Suggested-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/gpu/drm/imx/imx-tve.c b/drivers/gpu/drm/imx/imx-tve.c
index 3b602ee33c44..0c6bf12d45b1 100644
--- a/drivers/gpu/drm/imx/imx-tve.c
+++ b/drivers/gpu/drm/imx/imx-tve.c
@@ -98,6 +98,8 @@
 /* TVE_TST_MODE_REG */
 #define TVE_TVDAC_TEST_MODE_MASK        (0x7 << 0)
 
+#define IMX_TVE_DAC_VOLTAGE     2750000
+
 enum {
         TVE_MODE_TVOUT,
         TVE_MODE_VGA,
@@ -621,9 +623,8 @@ static int imx_tve_bind(struct device *dev, struct device *master, void *data)
 
         tve->dac_reg = devm_regulator_get(dev, "dac");
         if (!IS_ERR(tve->dac_reg)) {
-                ret = regulator_set_voltage(tve->dac_reg, 2750000, 2750000);
-                if (ret)
-                        return ret;
+                if (regulator_get_voltage(tve->dac_reg) != IMX_TVE_DAC_VOLTAGE)
+                        dev_warn(dev, "dac voltage is not %d uV\n", IMX_TVE_DAC_VOLTAGE);
                 ret = regulator_enable(tve->dac_reg);
                 if (ret)
                         return ret;