* [PATCH] drm/imx: imx-tve: Do not set the regulator voltage
@ 2017-02-08 12:31 Fabio Estevam
0 siblings, 0 replies; only message in thread
From: Fabio Estevam @ 2017-02-08 12:31 UTC (permalink / raw)
To: p.zabel; +Cc: l.stach, dri-devel, Fabio Estevam, # 4 . 8+
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>
---
drivers/gpu/drm/imx/imx-tve.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/imx/imx-tve.c b/drivers/gpu/drm/imx/imx-tve.c
index 8f8aa4a..f20a3e0 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,
@@ -616,9 +618,9 @@ 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 %d uV instead of %d uV\n",
+ ret, IMX_TVE_DAC_VOLTAGE);
ret = regulator_enable(tve->dac_reg);
if (ret)
return ret;
--
2.7.4
^ permalink raw reply related [flat|nested] only message in thread
only message in thread, other threads:[~2017-02-08 12:31 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-02-08 12:31 [PATCH] drm/imx: imx-tve: Do not set the regulator voltage Fabio Estevam
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).