RE: [PATCH v2 2/3] drm/bridge: lvds-codec: Add support for regulator
Hi Laurent,
Thanks for the feedback.
> Subject: Re: [PATCH v2 2/3] drm/bridge: lvds-codec: Add support for
> regulator
>
> Hi Biju,
>
> Thank you for the patch.
>
> On Mon, Aug 10, 2020 at 04:22:18PM +0100, Biju Das wrote:
> > Add the support for enabling optional regulator that may be used as
> > VCC source.
> >
> > Signed-off-by: Biju Das
> > ---
> > New Patch Ref: Ref:https://patchwork.kernel.org/patch/11705819/
> > ---
> > drivers/gpu/drm/bridge/lvds-codec.c | 29
> > +
> > 1 file changed, 29 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/bridge/lvds-codec.c
> > b/drivers/gpu/drm/bridge/lvds-codec.c
> > index 24fb1befdfa2..5858a29aafe6 100644
> > --- a/drivers/gpu/drm/bridge/lvds-codec.c
> > +++ b/drivers/gpu/drm/bridge/lvds-codec.c
> > @@ -10,13 +10,16 @@
> > #include
> > #include
> > #include
> > +#include
> >
> > #include
> > #include
> >
> > struct lvds_codec {
> > +struct device *dev;
> > struct drm_bridge bridge;
> > struct drm_bridge *panel_bridge;
> > +struct regulator *vcc;
> > struct gpio_desc *powerdown_gpio;
> > u32 connector_type;
> > };
> > @@ -38,6 +41,14 @@ static int lvds_codec_attach(struct drm_bridge
> > *bridge, static void lvds_codec_enable(struct drm_bridge *bridge) {
> > struct lvds_codec *lvds_codec = to_lvds_codec(bridge);
> > +int ret;
> > +
> > +ret = regulator_enable(lvds_codec->vcc);
> > +if (ret) {
> > +dev_err(lvds_codec->dev,
> > +"Failed to enable regulator \"vcc\": %d\n", ret);
> > +return;
> > +}
> >
> > if (lvds_codec->powerdown_gpio)
> > gpiod_set_value_cansleep(lvds_codec->powerdown_gpio,
> 0); @@ -46,9
> > +57,15 @@ static void lvds_codec_enable(struct drm_bridge *bridge)
> > static void lvds_codec_disable(struct drm_bridge *bridge) {
> > struct lvds_codec *lvds_codec = to_lvds_codec(bridge);
> > +int ret;
> >
> > if (lvds_codec->powerdown_gpio)
> > gpiod_set_value_cansleep(lvds_codec->powerdown_gpio,
> 1);
> > +
> > +ret = regulator_disable(lvds_codec->vcc);
> > +if (ret)
> > +dev_err(lvds_codec->dev,
> > +"Failed to disable regulator \"vcc\": %d\n", ret);
> > }
> >
> > static const struct drm_bridge_funcs funcs = { @@ -63,12 +80,24 @@
> > static int lvds_codec_probe(struct platform_device *pdev)
> > struct device_node *panel_node;
> > struct drm_panel *panel;
> > struct lvds_codec *lvds_codec;
> > +int error;
>
> The driver tends to use "ret" for error status variables. If you're fine with
> this
> change there's no need to resubmit the patch, I can fix when applying.
Yes, I am ok with that.
Cheers,
Biju
> Reviewed-by: Laurent Pinchart
>
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Re: [PATCH v2 2/3] drm/bridge: lvds-codec: Add support for regulator
Hi Biju,
Thank you for the patch.
On Mon, Aug 10, 2020 at 04:22:18PM +0100, Biju Das wrote:
> Add the support for enabling optional regulator that may be used as VCC
> source.
>
> Signed-off-by: Biju Das
> ---
> New Patch Ref: Ref:https://patchwork.kernel.org/patch/11705819/
> ---
> drivers/gpu/drm/bridge/lvds-codec.c | 29 +
> 1 file changed, 29 insertions(+)
>
> diff --git a/drivers/gpu/drm/bridge/lvds-codec.c
> b/drivers/gpu/drm/bridge/lvds-codec.c
> index 24fb1befdfa2..5858a29aafe6 100644
> --- a/drivers/gpu/drm/bridge/lvds-codec.c
> +++ b/drivers/gpu/drm/bridge/lvds-codec.c
> @@ -10,13 +10,16 @@
> #include
> #include
> #include
> +#include
>
> #include
> #include
>
> struct lvds_codec {
> + struct device *dev;
> struct drm_bridge bridge;
> struct drm_bridge *panel_bridge;
> + struct regulator *vcc;
> struct gpio_desc *powerdown_gpio;
> u32 connector_type;
> };
> @@ -38,6 +41,14 @@ static int lvds_codec_attach(struct drm_bridge *bridge,
> static void lvds_codec_enable(struct drm_bridge *bridge)
> {
> struct lvds_codec *lvds_codec = to_lvds_codec(bridge);
> + int ret;
> +
> + ret = regulator_enable(lvds_codec->vcc);
> + if (ret) {
> + dev_err(lvds_codec->dev,
> + "Failed to enable regulator \"vcc\": %d\n", ret);
> + return;
> + }
>
> if (lvds_codec->powerdown_gpio)
> gpiod_set_value_cansleep(lvds_codec->powerdown_gpio, 0);
> @@ -46,9 +57,15 @@ static void lvds_codec_enable(struct drm_bridge *bridge)
> static void lvds_codec_disable(struct drm_bridge *bridge)
> {
> struct lvds_codec *lvds_codec = to_lvds_codec(bridge);
> + int ret;
>
> if (lvds_codec->powerdown_gpio)
> gpiod_set_value_cansleep(lvds_codec->powerdown_gpio, 1);
> +
> + ret = regulator_disable(lvds_codec->vcc);
> + if (ret)
> + dev_err(lvds_codec->dev,
> + "Failed to disable regulator \"vcc\": %d\n", ret);
> }
>
> static const struct drm_bridge_funcs funcs = {
> @@ -63,12 +80,24 @@ static int lvds_codec_probe(struct platform_device *pdev)
> struct device_node *panel_node;
> struct drm_panel *panel;
> struct lvds_codec *lvds_codec;
> + int error;
The driver tends to use "ret" for error status variables. If you're fine
with this change there's no need to resubmit the patch, I can fix when
applying.
Reviewed-by: Laurent Pinchart
>
> lvds_codec = devm_kzalloc(dev, sizeof(*lvds_codec), GFP_KERNEL);
> if (!lvds_codec)
> return -ENOMEM;
>
> + lvds_codec->dev = >dev;
> lvds_codec->connector_type = (uintptr_t)of_device_get_match_data(dev);
> +
> + lvds_codec->vcc = devm_regulator_get(lvds_codec->dev, "vcc");
> + if (IS_ERR(lvds_codec->vcc)) {
> + error = PTR_ERR(lvds_codec->vcc);
> + if (error != -EPROBE_DEFER)
> + dev_err(lvds_codec->dev,
> + "Unable to get \"vcc\" supply: %d\n", error);
> + return error;
> + }
> +
> lvds_codec->powerdown_gpio = devm_gpiod_get_optional(dev, "powerdown",
>GPIOD_OUT_HIGH);
> if (IS_ERR(lvds_codec->powerdown_gpio)) {
--
Regards,
Laurent Pinchart
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[PATCH v2 2/3] drm/bridge: lvds-codec: Add support for regulator
Add the support for enabling optional regulator that may be used as VCC
source.
Signed-off-by: Biju Das
---
New Patch Ref: Ref:https://patchwork.kernel.org/patch/11705819/
---
drivers/gpu/drm/bridge/lvds-codec.c | 29 +
1 file changed, 29 insertions(+)
diff --git a/drivers/gpu/drm/bridge/lvds-codec.c
b/drivers/gpu/drm/bridge/lvds-codec.c
index 24fb1befdfa2..5858a29aafe6 100644
--- a/drivers/gpu/drm/bridge/lvds-codec.c
+++ b/drivers/gpu/drm/bridge/lvds-codec.c
@@ -10,13 +10,16 @@
#include
#include
#include
+#include
#include
#include
struct lvds_codec {
+ struct device *dev;
struct drm_bridge bridge;
struct drm_bridge *panel_bridge;
+ struct regulator *vcc;
struct gpio_desc *powerdown_gpio;
u32 connector_type;
};
@@ -38,6 +41,14 @@ static int lvds_codec_attach(struct drm_bridge *bridge,
static void lvds_codec_enable(struct drm_bridge *bridge)
{
struct lvds_codec *lvds_codec = to_lvds_codec(bridge);
+ int ret;
+
+ ret = regulator_enable(lvds_codec->vcc);
+ if (ret) {
+ dev_err(lvds_codec->dev,
+ "Failed to enable regulator \"vcc\": %d\n", ret);
+ return;
+ }
if (lvds_codec->powerdown_gpio)
gpiod_set_value_cansleep(lvds_codec->powerdown_gpio, 0);
@@ -46,9 +57,15 @@ static void lvds_codec_enable(struct drm_bridge *bridge)
static void lvds_codec_disable(struct drm_bridge *bridge)
{
struct lvds_codec *lvds_codec = to_lvds_codec(bridge);
+ int ret;
if (lvds_codec->powerdown_gpio)
gpiod_set_value_cansleep(lvds_codec->powerdown_gpio, 1);
+
+ ret = regulator_disable(lvds_codec->vcc);
+ if (ret)
+ dev_err(lvds_codec->dev,
+ "Failed to disable regulator \"vcc\": %d\n", ret);
}
static const struct drm_bridge_funcs funcs = {
@@ -63,12 +80,24 @@ static int lvds_codec_probe(struct platform_device *pdev)
struct device_node *panel_node;
struct drm_panel *panel;
struct lvds_codec *lvds_codec;
+ int error;
lvds_codec = devm_kzalloc(dev, sizeof(*lvds_codec), GFP_KERNEL);
if (!lvds_codec)
return -ENOMEM;
+ lvds_codec->dev = >dev;
lvds_codec->connector_type = (uintptr_t)of_device_get_match_data(dev);
+
+ lvds_codec->vcc = devm_regulator_get(lvds_codec->dev, "vcc");
+ if (IS_ERR(lvds_codec->vcc)) {
+ error = PTR_ERR(lvds_codec->vcc);
+ if (error != -EPROBE_DEFER)
+ dev_err(lvds_codec->dev,
+ "Unable to get \"vcc\" supply: %d\n", error);
+ return error;
+ }
+
lvds_codec->powerdown_gpio = devm_gpiod_get_optional(dev, "powerdown",
GPIOD_OUT_HIGH);
if (IS_ERR(lvds_codec->powerdown_gpio)) {
--
2.17.1
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