[RESEND v3 1/2] dt-bindings: drm/bridge: anx7625: Add power supplies

[RESEND v3 1/2] dt-bindings: drm/bridge: anx7625: Add power supplies

[Hsin-Yi Wang]

anx7625 requires 3 power supply regulators.

Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 .../bindings/display/bridge/analogix,anx7625.yaml | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml b/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
index 60585a4fc22bc..3ae97d9523e56 100644
--- a/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
+++ b/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
@@ -34,6 +34,15 @@ properties:
     description: used for reset chip control, RESET_N pin B7.
     maxItems: 1
 
+  vdd10-supply:
+    description: Regulator that provides the supply 1.0V power.
+
+  vdd18-supply:
+    description: Regulator that provides the supply 1.8V power.
+
+  vdd33-supply:
+    description: Regulator that provides the supply 3.3V power.
+
   ports:
     type: object
 
@@ -55,6 +64,9 @@ properties:
 required:
   - compatible
   - reg
+  - vdd10-supply
+  - vdd18-supply
+  - vdd33-supply
   - ports
 
 additionalProperties: false
@@ -72,6 +84,9 @@ examples:
             reg = <0x58>;
             enable-gpios = <&pio 45 GPIO_ACTIVE_HIGH>;
             reset-gpios = <&pio 73 GPIO_ACTIVE_HIGH>;
+            vdd10-supply = <&pp1000_mipibrdg>;
+            vdd18-supply = <&pp1800_mipibrdg>;
+            vdd33-supply = <&pp3300_mipibrdg>;
 
             ports {
                 #address-cells = <1>;
-- 
2.30.0.617.g56c4b15f3c-goog

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[RESEND v3 2/2] drm/bridge: anx7625: disable regulators when power off

[Hsin-Yi Wang]

When suspending the driver, anx7625_power_standby() will be called to
turn off reset-gpios and enable-gpios. However, power supplies are not
disabled. To save power, the driver can get the power supply regulators
and turn off them in anx7625_power_standby().

Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
---
Change:
v3: add delays between regulators power on
---
 drivers/gpu/drm/bridge/analogix/anx7625.c | 34 +++++++++++++++++++++++
 drivers/gpu/drm/bridge/analogix/anx7625.h |  1 +
 2 files changed, 35 insertions(+)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 65cc05982f826..23283ba0c4f93 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -11,6 +11,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <linux/types.h>
 #include <linux/workqueue.h>
@@ -875,12 +876,25 @@ static int sp_tx_edid_read(struct anx7625_data *ctx,
 static void anx7625_power_on(struct anx7625_data *ctx)
 {
 	struct device *dev = &ctx->client->dev;
+	int ret, i;
 
 	if (!ctx->pdata.low_power_mode) {
 		DRM_DEV_DEBUG_DRIVER(dev, "not low power mode!\n");
 		return;
 	}
 
+	for (i = 0; i < ARRAY_SIZE(ctx->pdata.supplies); i++) {
+		ret = regulator_enable(ctx->pdata.supplies[i].consumer);
+		if (ret < 0) {
+			DRM_DEV_DEBUG_DRIVER(dev, "cannot enable supply %d: %d\n",
+					     i, ret);
+			goto reg_err;
+		}
+		usleep_range(2000, 2100);
+	}
+
+	usleep_range(4000, 4100);
+
 	/* Power on pin enable */
 	gpiod_set_value(ctx->pdata.gpio_p_on, 1);
 	usleep_range(10000, 11000);
@@ -889,11 +903,16 @@ static void anx7625_power_on(struct anx7625_data *ctx)
 	usleep_range(10000, 11000);
 
 	DRM_DEV_DEBUG_DRIVER(dev, "power on !\n");
+	return;
+reg_err:
+	for (--i; i >= 0; i--)
+		regulator_disable(ctx->pdata.supplies[i].consumer);
 }
 
 static void anx7625_power_standby(struct anx7625_data *ctx)
 {
 	struct device *dev = &ctx->client->dev;
+	int ret;
 
 	if (!ctx->pdata.low_power_mode) {
 		DRM_DEV_DEBUG_DRIVER(dev, "not low power mode!\n");
@@ -904,6 +923,12 @@ static void anx7625_power_standby(struct anx7625_data *ctx)
 	usleep_range(1000, 1100);
 	gpiod_set_value(ctx->pdata.gpio_p_on, 0);
 	usleep_range(1000, 1100);
+
+	ret = regulator_bulk_disable(ARRAY_SIZE(ctx->pdata.supplies),
+				     ctx->pdata.supplies);
+	if (ret < 0)
+		DRM_DEV_DEBUG_DRIVER(dev, "cannot disable supplies %d\n", ret);
+
 	DRM_DEV_DEBUG_DRIVER(dev, "power down\n");
 }
 
@@ -1742,6 +1767,15 @@ static int anx7625_i2c_probe(struct i2c_client *client,
 	platform->client = client;
 	i2c_set_clientdata(client, platform);
 
+	pdata->supplies[0].supply = "vdd10";
+	pdata->supplies[1].supply = "vdd18";
+	pdata->supplies[2].supply = "vdd33";
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(pdata->supplies),
+				      pdata->supplies);
+	if (ret) {
+		DRM_DEV_ERROR(dev, "fail to get power supplies: %d\n", ret);
+		return ret;
+	}
 	anx7625_init_gpio(platform);
 
 	atomic_set(&platform->power_status, 0);
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.h b/drivers/gpu/drm/bridge/analogix/anx7625.h
index 193ad86c54503..e4a086b3a3d7b 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.h
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.h
@@ -350,6 +350,7 @@ struct s_edid_data {
 struct anx7625_platform_data {
 	struct gpio_desc *gpio_p_on;
 	struct gpio_desc *gpio_reset;
+	struct regulator_bulk_data supplies[3];
 	struct drm_bridge *panel_bridge;
 	int intp_irq;
 	u32 low_power_mode;
-- 
2.30.0.617.g56c4b15f3c-goog

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Re: [RESEND v3 1/2] dt-bindings: drm/bridge: anx7625: Add power supplies

[Robert Foss]

Hey Hsin-Yi,

Thanks for the patch, and sorry about the delays in reviewing this.

This patch does not apply to the drm-misc/for-linux-next branch due to
some other changes having been merged.

On Sat, 20 Feb 2021 at 07:10, Hsin-Yi Wang <hsinyi@chromium.org> wrote:
>
> anx7625 requires 3 power supply regulators.
>
> Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
> Reviewed-by: Rob Herring <robh@kernel.org>
> ---
>  .../bindings/display/bridge/analogix,anx7625.yaml | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml b/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
> index 60585a4fc22bc..3ae97d9523e56 100644
> --- a/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
> @@ -34,6 +34,15 @@ properties:
>      description: used for reset chip control, RESET_N pin B7.
>      maxItems: 1
>
> +  vdd10-supply:
> +    description: Regulator that provides the supply 1.0V power.
> +
> +  vdd18-supply:
> +    description: Regulator that provides the supply 1.8V power.
> +
> +  vdd33-supply:
> +    description: Regulator that provides the supply 3.3V power.
> +

This chunk below has seen some changes.

With this patch fixed, feel free to add my r-b.
Reviewed-by: Robert Foss <robert.foss@linaro.org>

>    ports:
>      type: object
>
> @@ -55,6 +64,9 @@ properties:
>  required:
>    - compatible
>    - reg
> +  - vdd10-supply
> +  - vdd18-supply
> +  - vdd33-supply
>    - ports
>
>  additionalProperties: false
> @@ -72,6 +84,9 @@ examples:
>              reg = <0x58>;
>              enable-gpios = <&pio 45 GPIO_ACTIVE_HIGH>;
>              reset-gpios = <&pio 73 GPIO_ACTIVE_HIGH>;
> +            vdd10-supply = <&pp1000_mipibrdg>;
> +            vdd18-supply = <&pp1800_mipibrdg>;
> +            vdd33-supply = <&pp3300_mipibrdg>;
>
>              ports {
>                  #address-cells = <1>;
> --
> 2.30.0.617.g56c4b15f3c-goog
>
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