* [PATCH v2] drm/imx: imx-tve: Do not set the regulator voltage
@ 2017-02-08 12:47 ` Fabio Estevam
0 siblings, 0 replies; 4+ messages in thread
From: Fabio Estevam @ 2017-02-08 12:47 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>
---
Changes since v1:
- Fix the warning message. When a 'dac-supply' node is not passed we cannot
print the regulator_get_voltage() value.
drivers/gpu/drm/imx/imx-tve.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/imx/imx-tve.c b/drivers/gpu/drm/imx/imx-tve.c
index 8f8aa4a..4826bb7 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 +618,8 @@ 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;
--
2.7.4
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH v2] drm/imx: imx-tve: Do not set the regulator voltage
@ 2017-02-08 12:47 ` Fabio Estevam
0 siblings, 0 replies; 4+ messages in thread
From: Fabio Estevam @ 2017-02-08 12:47 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>
---
Changes since v1:
- Fix the warning message. When a 'dac-supply' node is not passed we cannot
print the regulator_get_voltage() value.
drivers/gpu/drm/imx/imx-tve.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/imx/imx-tve.c b/drivers/gpu/drm/imx/imx-tve.c
index 8f8aa4a..4826bb7 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 +618,8 @@ 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;
--
2.7.4
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH v2] drm/imx: imx-tve: Do not set the regulator voltage
2017-02-08 12:47 ` Fabio Estevam
@ 2017-02-09 11:10 ` Philipp Zabel
-1 siblings, 0 replies; 4+ messages in thread
From: Philipp Zabel @ 2017-02-09 11:10 UTC (permalink / raw)
To: Fabio Estevam; +Cc: l.stach, dri-devel, # 4 . 8+
On Wed, 2017-02-08 at 10:47 -0200, Fabio Estevam wrote:
> 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>
Thanks, I've applied this instead of the devm_regulator_get_optional
patch.
regards
Philipp
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v2] drm/imx: imx-tve: Do not set the regulator voltage
@ 2017-02-09 11:10 ` Philipp Zabel
0 siblings, 0 replies; 4+ messages in thread
From: Philipp Zabel @ 2017-02-09 11:10 UTC (permalink / raw)
To: Fabio Estevam; +Cc: # 4 . 8+, dri-devel
On Wed, 2017-02-08 at 10:47 -0200, Fabio Estevam wrote:
> 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>
Thanks, I've applied this instead of the devm_regulator_get_optional
patch.
regards
Philipp
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^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2017-02-09 11:31 UTC | newest]
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2017-02-08 12:47 [PATCH v2] drm/imx: imx-tve: Do not set the regulator voltage Fabio Estevam
2017-02-08 12:47 ` Fabio Estevam
2017-02-09 11:10 ` Philipp Zabel
2017-02-09 11:10 ` Philipp Zabel
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