Commit fc12bccd authored by Fabio Estevam's avatar Fabio Estevam Committed by Philipp Zabel

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

Commit deb65870 ("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: deb65870 ("drm/imx: imx-tve: check the value returned by regulator_set_voltage()")
Cc: <stable@vger.kernel.org> # 4.8+
Suggested-by: default avatarLucas Stach <l.stach@pengutronix.de>
Signed-off-by: default avatarFabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
parent 7089db84
...@@ -98,6 +98,8 @@ ...@@ -98,6 +98,8 @@
/* TVE_TST_MODE_REG */ /* TVE_TST_MODE_REG */
#define TVE_TVDAC_TEST_MODE_MASK (0x7 << 0) #define TVE_TVDAC_TEST_MODE_MASK (0x7 << 0)
#define IMX_TVE_DAC_VOLTAGE 2750000
enum { enum {
TVE_MODE_TVOUT, TVE_MODE_TVOUT,
TVE_MODE_VGA, TVE_MODE_VGA,
...@@ -621,9 +623,8 @@ static int imx_tve_bind(struct device *dev, struct device *master, void *data) ...@@ -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"); tve->dac_reg = devm_regulator_get(dev, "dac");
if (!IS_ERR(tve->dac_reg)) { if (!IS_ERR(tve->dac_reg)) {
ret = regulator_set_voltage(tve->dac_reg, 2750000, 2750000); if (regulator_get_voltage(tve->dac_reg) != IMX_TVE_DAC_VOLTAGE)
if (ret) dev_warn(dev, "dac voltage is not %d uV\n", IMX_TVE_DAC_VOLTAGE);
return ret;
ret = regulator_enable(tve->dac_reg); ret = regulator_enable(tve->dac_reg);
if (ret) if (ret)
return ret; return ret;
......
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