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

Commit deb65870b5 ("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: deb65870b5 ("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>
This commit is contained in:
Fabio Estevam 2017-02-08 10:47:49 -02:00 committed by Philipp Zabel
parent 7089db84e3
commit fc12bccda8
1 changed files with 4 additions and 3 deletions
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7
drivers/gpu/drm/imx/imx-tve.c
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@ -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;