[PATCH v3 0/9] media: i2c: ov5645 driver enhancements

[PATCH v3 0/9] media: i2c: ov5645 driver enhancements

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Hi All,

The main aim of this series is to add Runtime PM support to the sensor
driver alongside some cleanups and fixes.

v2 -> v3
- Included patch#1 [2] as part of this series
- Patched all in-tree DTS for dropping the clock preoperty to
  avoid dt warnings
- Fixed review comments pointed by Sakari and Laurent for the Runtime
  PM patch
- Now sending the error code of first error while stream off.
- Included RB tags from Laurent

v1-> v2
- patch #1 is infact a v3 [1] no changes
- patch #2 fixed review comments pointed by Sakari
- patch #3 [0] no changes 
- patches #4 and #5 are new

[0] https://patchwork.linuxtv.org/project/linux-media/patch/20220927202005.750621-1-prabhakar.mahadev-lad.rj@bp.renesas.com/
[1] https://patchwork.linuxtv.org/project/linux-media/patch/20220919153540.178732-1-prabhakar.mahadev-lad.rj@bp.renesas.com/
[2] https://patchwork.kernel.org/project/linux-media/patch/20220919143350.176746-1-prabhakar.mahadev-lad.rj@bp.renesas.com/

Lad Prabhakar (9):
  media: i2c: ov5645: Drop fetching the clk reference by name
  ARM: dts: imx6qdl-pico: Drop clock-names property
  ARM: dts: imx6qdl-wandboard: Drop clock-names property
  arm64: dts: renesas: aistarvision-mipi-adapter-2.1: Drop clock-names
    property
  media: dt-bindings: ov5645: Convert OV5645 binding to a schema
  media: i2c: ov5645: Use runtime PM
  media: i2c: ov5645: Drop empty comment
  media: i2c: ov5645: Don't return early on failures for s_stream(0)
  media: i2c: ov5645: Call ov5645_entity_init_cfg() before registering
    the subdev

 .../devicetree/bindings/media/i2c/ov5645.txt  |  54 ------
 .../bindings/media/i2c/ovti,ov5645.yaml       | 104 ++++++++++++
 arch/arm/boot/dts/imx6qdl-pico.dtsi           |   1 -
 arch/arm/boot/dts/imx6qdl-wandboard.dtsi      |   1 -
 .../aistarvision-mipi-adapter-2.1.dtsi        |   1 -
 drivers/media/i2c/Kconfig                     |   2 +-
 drivers/media/i2c/ov5645.c                    | 157 +++++++++---------
 7 files changed, 186 insertions(+), 134 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/media/i2c/ov5645.txt
 create mode 100644 Documentation/devicetree/bindings/media/i2c/ovti,ov5645.yaml

-- 
2.25.1

[PATCH v3 0/9] media: i2c: ov5645 driver enhancements

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Hi All,

The main aim of this series is to add Runtime PM support to the sensor
driver alongside some cleanups and fixes.

v2 -> v3
- Included patch#1 [2] as part of this series
- Patched all in-tree DTS for dropping the clock preoperty to
  avoid dt warnings
- Fixed review comments pointed by Sakari and Laurent for the Runtime
  PM patch
- Now sending the error code of first error while stream off.
- Included RB tags from Laurent

v1-> v2
- patch #1 is infact a v3 [1] no changes
- patch #2 fixed review comments pointed by Sakari
- patch #3 [0] no changes 
- patches #4 and #5 are new

[0] https://patchwork.linuxtv.org/project/linux-media/patch/20220927202005.750621-1-prabhakar.mahadev-lad.rj@bp.renesas.com/
[1] https://patchwork.linuxtv.org/project/linux-media/patch/20220919153540.178732-1-prabhakar.mahadev-lad.rj@bp.renesas.com/
[2] https://patchwork.kernel.org/project/linux-media/patch/20220919143350.176746-1-prabhakar.mahadev-lad.rj@bp.renesas.com/

Lad Prabhakar (9):
  media: i2c: ov5645: Drop fetching the clk reference by name
  ARM: dts: imx6qdl-pico: Drop clock-names property
  ARM: dts: imx6qdl-wandboard: Drop clock-names property
  arm64: dts: renesas: aistarvision-mipi-adapter-2.1: Drop clock-names
    property
  media: dt-bindings: ov5645: Convert OV5645 binding to a schema
  media: i2c: ov5645: Use runtime PM
  media: i2c: ov5645: Drop empty comment
  media: i2c: ov5645: Don't return early on failures for s_stream(0)
  media: i2c: ov5645: Call ov5645_entity_init_cfg() before registering
    the subdev

 .../devicetree/bindings/media/i2c/ov5645.txt  |  54 ------
 .../bindings/media/i2c/ovti,ov5645.yaml       | 104 ++++++++++++
 arch/arm/boot/dts/imx6qdl-pico.dtsi           |   1 -
 arch/arm/boot/dts/imx6qdl-wandboard.dtsi      |   1 -
 .../aistarvision-mipi-adapter-2.1.dtsi        |   1 -
 drivers/media/i2c/Kconfig                     |   2 +-
 drivers/media/i2c/ov5645.c                    | 157 +++++++++---------
 7 files changed, 186 insertions(+), 134 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/media/i2c/ov5645.txt
 create mode 100644 Documentation/devicetree/bindings/media/i2c/ovti,ov5645.yaml

-- 
2.25.1


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[PATCH v3 1/9] media: i2c: ov5645: Drop fetching the clk reference by name

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

The OV5645 sensor has a single clock source, so just drop fetching the
clk reference by name.

This is in preparation to drop the "clock-names" property from the DT
binding.

Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
---
v1->v3
* No change

v1:
https://patchwork.kernel.org/project/linux-media/patch/20220919143350.176746-1-prabhakar.mahadev-lad.rj@bp.renesas.com/
---
 drivers/media/i2c/ov5645.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
index 81e4e87e1821..47451238ca05 100644
--- a/drivers/media/i2c/ov5645.c
+++ b/drivers/media/i2c/ov5645.c
@@ -1090,7 +1090,7 @@ static int ov5645_probe(struct i2c_client *client)
 	}
 
 	/* get system clock (xclk) */
-	ov5645->xclk = devm_clk_get(dev, "xclk");
+	ov5645->xclk = devm_clk_get(dev, NULL);
 	if (IS_ERR(ov5645->xclk)) {
 		dev_err(dev, "could not get xclk");
 		return PTR_ERR(ov5645->xclk);
-- 
2.25.1

[PATCH v3 1/9] media: i2c: ov5645: Drop fetching the clk reference by name

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

The OV5645 sensor has a single clock source, so just drop fetching the
clk reference by name.

This is in preparation to drop the "clock-names" property from the DT
binding.

Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
---
v1->v3
* No change

v1:
https://patchwork.kernel.org/project/linux-media/patch/20220919143350.176746-1-prabhakar.mahadev-lad.rj@bp.renesas.com/
---
 drivers/media/i2c/ov5645.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
index 81e4e87e1821..47451238ca05 100644
--- a/drivers/media/i2c/ov5645.c
+++ b/drivers/media/i2c/ov5645.c
@@ -1090,7 +1090,7 @@ static int ov5645_probe(struct i2c_client *client)
 	}
 
 	/* get system clock (xclk) */
-	ov5645->xclk = devm_clk_get(dev, "xclk");
+	ov5645->xclk = devm_clk_get(dev, NULL);
 	if (IS_ERR(ov5645->xclk)) {
 		dev_err(dev, "could not get xclk");
 		return PTR_ERR(ov5645->xclk);
-- 
2.25.1


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[PATCH v3 2/9] ARM: dts: imx6qdl-pico: Drop clock-names property

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Now that the driver has been updated to drop fetching the clk reference by
name we no longer need the clock-names property in the ov5645 sensor node.

This is in preparation for removal for clock-names property from the
DT binding.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
v3
* New patch
---
 arch/arm/boot/dts/imx6qdl-pico.dtsi | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm/boot/dts/imx6qdl-pico.dtsi b/arch/arm/boot/dts/imx6qdl-pico.dtsi
index f7a56d6b160c..c39a9ebdaba1 100644
--- a/arch/arm/boot/dts/imx6qdl-pico.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-pico.dtsi
@@ -233,7 +233,6 @@ camera@3c {
 		pinctrl-0 = <&pinctrl_ov5645>;
 		reg = <0x3c>;
 		clocks = <&clks IMX6QDL_CLK_CKO2>;
-		clock-names = "xclk";
 		clock-frequency = <24000000>;
 		vdddo-supply = <&reg_1p8v>;
 		vdda-supply = <&reg_2p8v>;
-- 
2.25.1

[PATCH v3 2/9] ARM: dts: imx6qdl-pico: Drop clock-names property

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Now that the driver has been updated to drop fetching the clk reference by
name we no longer need the clock-names property in the ov5645 sensor node.

This is in preparation for removal for clock-names property from the
DT binding.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
v3
* New patch
---
 arch/arm/boot/dts/imx6qdl-pico.dtsi | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm/boot/dts/imx6qdl-pico.dtsi b/arch/arm/boot/dts/imx6qdl-pico.dtsi
index f7a56d6b160c..c39a9ebdaba1 100644
--- a/arch/arm/boot/dts/imx6qdl-pico.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-pico.dtsi
@@ -233,7 +233,6 @@ camera@3c {
 		pinctrl-0 = <&pinctrl_ov5645>;
 		reg = <0x3c>;
 		clocks = <&clks IMX6QDL_CLK_CKO2>;
-		clock-names = "xclk";
 		clock-frequency = <24000000>;
 		vdddo-supply = <&reg_1p8v>;
 		vdda-supply = <&reg_2p8v>;
-- 
2.25.1


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[PATCH v3 3/9] ARM: dts: imx6qdl-wandboard: Drop clock-names property

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Now that the driver has been updated to drop fetching the clk reference by
name we no longer need the clock-names property in the ov5645 sensor node.

This is in preparation for removal for clock-names property from the DT
binding.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
v3
* New patch
---
 arch/arm/boot/dts/imx6qdl-wandboard.dtsi | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm/boot/dts/imx6qdl-wandboard.dtsi b/arch/arm/boot/dts/imx6qdl-wandboard.dtsi
index ec6fba5ee8fd..e4f63423d8ee 100644
--- a/arch/arm/boot/dts/imx6qdl-wandboard.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-wandboard.dtsi
@@ -131,7 +131,6 @@ camera@3c {
 		pinctrl-0 = <&pinctrl_ov5645>;
 		reg = <0x3c>;
 		clocks = <&clks IMX6QDL_CLK_CKO2>;
-		clock-names = "xclk";
 		clock-frequency = <24000000>;
 		vdddo-supply = <&reg_1p8v>;
 		vdda-supply = <&reg_2p8v>;
-- 
2.25.1

[PATCH v3 3/9] ARM: dts: imx6qdl-wandboard: Drop clock-names property

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Now that the driver has been updated to drop fetching the clk reference by
name we no longer need the clock-names property in the ov5645 sensor node.

This is in preparation for removal for clock-names property from the DT
binding.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
v3
* New patch
---
 arch/arm/boot/dts/imx6qdl-wandboard.dtsi | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm/boot/dts/imx6qdl-wandboard.dtsi b/arch/arm/boot/dts/imx6qdl-wandboard.dtsi
index ec6fba5ee8fd..e4f63423d8ee 100644
--- a/arch/arm/boot/dts/imx6qdl-wandboard.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-wandboard.dtsi
@@ -131,7 +131,6 @@ camera@3c {
 		pinctrl-0 = <&pinctrl_ov5645>;
 		reg = <0x3c>;
 		clocks = <&clks IMX6QDL_CLK_CKO2>;
-		clock-names = "xclk";
 		clock-frequency = <24000000>;
 		vdddo-supply = <&reg_1p8v>;
 		vdda-supply = <&reg_2p8v>;
-- 
2.25.1


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[PATCH v3 4/9] arm64: dts: renesas: aistarvision-mipi-adapter-2.1: Drop clock-names property

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Now that the driver has been updated to drop fetching the clk reference by
name we no longer need the clock-names property in the ov5645 sensor node.

This is in preparation for removal for clock-names property from the DT
binding.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
v3
* New patch
---
 arch/arm64/boot/dts/renesas/aistarvision-mipi-adapter-2.1.dtsi | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm64/boot/dts/renesas/aistarvision-mipi-adapter-2.1.dtsi b/arch/arm64/boot/dts/renesas/aistarvision-mipi-adapter-2.1.dtsi
index 7ce986f0a06f..7cb5c958aece 100644
--- a/arch/arm64/boot/dts/renesas/aistarvision-mipi-adapter-2.1.dtsi
+++ b/arch/arm64/boot/dts/renesas/aistarvision-mipi-adapter-2.1.dtsi
@@ -65,7 +65,6 @@ &MIPI_OV5645_PARENT_I2C {
 	ov5645: ov5645@3c {
 		compatible = "ovti,ov5645";
 		reg = <0x3c>;
-		clock-names = "xclk";
 		clocks = <&osc25250_clk>;
 		clock-frequency = <24000000>;
 		vdddo-supply = <&ov5645_vdddo_1v8>;
-- 
2.25.1

[PATCH v3 4/9] arm64: dts: renesas: aistarvision-mipi-adapter-2.1: Drop clock-names property

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Now that the driver has been updated to drop fetching the clk reference by
name we no longer need the clock-names property in the ov5645 sensor node.

This is in preparation for removal for clock-names property from the DT
binding.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
v3
* New patch
---
 arch/arm64/boot/dts/renesas/aistarvision-mipi-adapter-2.1.dtsi | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm64/boot/dts/renesas/aistarvision-mipi-adapter-2.1.dtsi b/arch/arm64/boot/dts/renesas/aistarvision-mipi-adapter-2.1.dtsi
index 7ce986f0a06f..7cb5c958aece 100644
--- a/arch/arm64/boot/dts/renesas/aistarvision-mipi-adapter-2.1.dtsi
+++ b/arch/arm64/boot/dts/renesas/aistarvision-mipi-adapter-2.1.dtsi
@@ -65,7 +65,6 @@ &MIPI_OV5645_PARENT_I2C {
 	ov5645: ov5645@3c {
 		compatible = "ovti,ov5645";
 		reg = <0x3c>;
-		clock-names = "xclk";
 		clocks = <&osc25250_clk>;
 		clock-frequency = <24000000>;
 		vdddo-supply = <&ov5645_vdddo_1v8>;
-- 
2.25.1


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[PATCH v3 5/9] media: dt-bindings: ov5645: Convert OV5645 binding to a schema

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Convert the simple OV5645 Device Tree binding to json-schema.

The previous binding marked the below properties as required which was a
driver requirement and not the device requirement so just drop them from
the required list during the conversion.
- clock-frequency
- enable-gpios
- reset-gpios

Also drop the "clock-names" property as we have a single clock source for
the sensor and the driver has been updated to drop the clk referencing by
name.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
Resend v3:
* No change

v2 -> v3
* Dropped clock-names property
* Marked power supplies as mandatory
* Dropped the comment for voltage power supplies
* Included RB tag from Laurent
* Driver change to drop clock-names [0]

[0] https://lore.kernel.org/linux-media/Yyh%2F3uzOJOu3drEB@pendragon.ideasonboard.com/T/#t

v1 -> v2
* Dropped ref to video-interface-devices.yaml#
* Dropped driver specific required items from the list
* Updated commit message
* Dropped clock-lanes and bus-type from the port and example node
* Marked data-lanes as required in port node
---
 .../devicetree/bindings/media/i2c/ov5645.txt  |  54 ---------
 .../bindings/media/i2c/ovti,ov5645.yaml       | 104 ++++++++++++++++++
 2 files changed, 104 insertions(+), 54 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/media/i2c/ov5645.txt
 create mode 100644 Documentation/devicetree/bindings/media/i2c/ovti,ov5645.yaml

diff --git a/Documentation/devicetree/bindings/media/i2c/ov5645.txt b/Documentation/devicetree/bindings/media/i2c/ov5645.txt
deleted file mode 100644
index 72ad992f77be..000000000000
--- a/Documentation/devicetree/bindings/media/i2c/ov5645.txt
+++ /dev/null
@@ -1,54 +0,0 @@
-* Omnivision 1/4-Inch 5Mp CMOS Digital Image Sensor
-
-The Omnivision OV5645 is a 1/4-Inch CMOS active pixel digital image sensor with
-an active array size of 2592H x 1944V. It is programmable through a serial I2C
-interface.
-
-Required Properties:
-- compatible: Value should be "ovti,ov5645".
-- clocks: Reference to the xclk clock.
-- clock-names: Should be "xclk".
-- clock-frequency: Frequency of the xclk clock.
-- enable-gpios: Chip enable GPIO. Polarity is GPIO_ACTIVE_HIGH. This corresponds
-  to the hardware pin PWDNB which is physically active low.
-- reset-gpios: Chip reset GPIO. Polarity is GPIO_ACTIVE_LOW. This corresponds to
-  the hardware pin RESETB.
-- vdddo-supply: Chip digital IO regulator.
-- vdda-supply: Chip analog regulator.
-- vddd-supply: Chip digital core regulator.
-
-The device node must contain one 'port' child node for its digital output
-video port, in accordance with the video interface bindings defined in
-Documentation/devicetree/bindings/media/video-interfaces.txt.
-
-Example:
-
-	&i2c1 {
-		...
-
-		ov5645: ov5645@3c {
-			compatible = "ovti,ov5645";
-			reg = <0x3c>;
-
-			enable-gpios = <&gpio1 6 GPIO_ACTIVE_HIGH>;
-			reset-gpios = <&gpio5 20 GPIO_ACTIVE_LOW>;
-			pinctrl-names = "default";
-			pinctrl-0 = <&camera_rear_default>;
-
-			clocks = <&clks 200>;
-			clock-names = "xclk";
-			clock-frequency = <24000000>;
-
-			vdddo-supply = <&camera_dovdd_1v8>;
-			vdda-supply = <&camera_avdd_2v8>;
-			vddd-supply = <&camera_dvdd_1v2>;
-
-			port {
-				ov5645_ep: endpoint {
-					clock-lanes = <1>;
-					data-lanes = <0 2>;
-					remote-endpoint = <&csi0_ep>;
-				};
-			};
-		};
-	};
diff --git a/Documentation/devicetree/bindings/media/i2c/ovti,ov5645.yaml b/Documentation/devicetree/bindings/media/i2c/ovti,ov5645.yaml
new file mode 100644
index 000000000000..0b10483cd267
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/ovti,ov5645.yaml
@@ -0,0 +1,104 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/i2c/ovti,ov5645.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: OmniVision OV5645 Image Sensor Device Tree Bindings
+
+maintainers:
+  - Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
+
+properties:
+  compatible:
+    const: ovti,ov5645
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    description: XCLK Input Clock
+
+  clock-frequency:
+    description: Frequency of the xclk clock in Hz.
+
+  vdda-supply:
+    description: Analog voltage supply, 2.8 volts
+
+  vddd-supply:
+    description: Digital core voltage supply, 1.5 volts
+
+  vdddo-supply:
+    description: Digital I/O voltage supply, 1.8 volts
+
+  enable-gpios:
+    maxItems: 1
+    description:
+      Reference to the GPIO connected to the PWDNB pin, if any.
+
+  reset-gpios:
+    maxItems: 1
+    description:
+      Reference to the GPIO connected to the RESETB pin, if any.
+
+  port:
+    description: Digital Output Port
+    $ref: /schemas/graph.yaml#/$defs/port-base
+    additionalProperties: false
+
+    properties:
+      endpoint:
+        $ref: /schemas/media/video-interfaces.yaml#
+        unevaluatedProperties: false
+
+        properties:
+          data-lanes:
+            minItems: 1
+            maxItems: 2
+            items:
+              enum: [1, 2]
+
+        required:
+          - data-lanes
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - vdddo-supply
+  - vdda-supply
+  - vddd-supply
+  - port
+
+additionalProperties: false
+
+examples:
+  - |
+      #include <dt-bindings/gpio/gpio.h>
+
+      i2c {
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          camera@3c {
+              compatible = "ovti,ov5645";
+              pinctrl-names = "default";
+              pinctrl-0 = <&pinctrl_ov5645>;
+              reg = <0x3c>;
+              clocks = <&clks 1>;
+              clock-frequency = <24000000>;
+              vdddo-supply = <&ov5645_vdddo_1v8>;
+              vdda-supply = <&ov5645_vdda_2v8>;
+              vddd-supply = <&ov5645_vddd_1v5>;
+              enable-gpios = <&gpio1 19 GPIO_ACTIVE_HIGH>;
+              reset-gpios = <&gpio1 20 GPIO_ACTIVE_LOW>;
+
+              port {
+                  ov5645_ep: endpoint {
+                      remote-endpoint = <&csi0_ep>;
+                      data-lanes = <1 2>;
+                  };
+              };
+          };
+      };
+...
-- 
2.25.1

[PATCH v3 5/9] media: dt-bindings: ov5645: Convert OV5645 binding to a schema

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Convert the simple OV5645 Device Tree binding to json-schema.

The previous binding marked the below properties as required which was a
driver requirement and not the device requirement so just drop them from
the required list during the conversion.
- clock-frequency
- enable-gpios
- reset-gpios

Also drop the "clock-names" property as we have a single clock source for
the sensor and the driver has been updated to drop the clk referencing by
name.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
Resend v3:
* No change

v2 -> v3
* Dropped clock-names property
* Marked power supplies as mandatory
* Dropped the comment for voltage power supplies
* Included RB tag from Laurent
* Driver change to drop clock-names [0]

[0] https://lore.kernel.org/linux-media/Yyh%2F3uzOJOu3drEB@pendragon.ideasonboard.com/T/#t

v1 -> v2
* Dropped ref to video-interface-devices.yaml#
* Dropped driver specific required items from the list
* Updated commit message
* Dropped clock-lanes and bus-type from the port and example node
* Marked data-lanes as required in port node
---
 .../devicetree/bindings/media/i2c/ov5645.txt  |  54 ---------
 .../bindings/media/i2c/ovti,ov5645.yaml       | 104 ++++++++++++++++++
 2 files changed, 104 insertions(+), 54 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/media/i2c/ov5645.txt
 create mode 100644 Documentation/devicetree/bindings/media/i2c/ovti,ov5645.yaml

diff --git a/Documentation/devicetree/bindings/media/i2c/ov5645.txt b/Documentation/devicetree/bindings/media/i2c/ov5645.txt
deleted file mode 100644
index 72ad992f77be..000000000000
--- a/Documentation/devicetree/bindings/media/i2c/ov5645.txt
+++ /dev/null
@@ -1,54 +0,0 @@
-* Omnivision 1/4-Inch 5Mp CMOS Digital Image Sensor
-
-The Omnivision OV5645 is a 1/4-Inch CMOS active pixel digital image sensor with
-an active array size of 2592H x 1944V. It is programmable through a serial I2C
-interface.
-
-Required Properties:
-- compatible: Value should be "ovti,ov5645".
-- clocks: Reference to the xclk clock.
-- clock-names: Should be "xclk".
-- clock-frequency: Frequency of the xclk clock.
-- enable-gpios: Chip enable GPIO. Polarity is GPIO_ACTIVE_HIGH. This corresponds
-  to the hardware pin PWDNB which is physically active low.
-- reset-gpios: Chip reset GPIO. Polarity is GPIO_ACTIVE_LOW. This corresponds to
-  the hardware pin RESETB.
-- vdddo-supply: Chip digital IO regulator.
-- vdda-supply: Chip analog regulator.
-- vddd-supply: Chip digital core regulator.
-
-The device node must contain one 'port' child node for its digital output
-video port, in accordance with the video interface bindings defined in
-Documentation/devicetree/bindings/media/video-interfaces.txt.
-
-Example:
-
-	&i2c1 {
-		...
-
-		ov5645: ov5645@3c {
-			compatible = "ovti,ov5645";
-			reg = <0x3c>;
-
-			enable-gpios = <&gpio1 6 GPIO_ACTIVE_HIGH>;
-			reset-gpios = <&gpio5 20 GPIO_ACTIVE_LOW>;
-			pinctrl-names = "default";
-			pinctrl-0 = <&camera_rear_default>;
-
-			clocks = <&clks 200>;
-			clock-names = "xclk";
-			clock-frequency = <24000000>;
-
-			vdddo-supply = <&camera_dovdd_1v8>;
-			vdda-supply = <&camera_avdd_2v8>;
-			vddd-supply = <&camera_dvdd_1v2>;
-
-			port {
-				ov5645_ep: endpoint {
-					clock-lanes = <1>;
-					data-lanes = <0 2>;
-					remote-endpoint = <&csi0_ep>;
-				};
-			};
-		};
-	};
diff --git a/Documentation/devicetree/bindings/media/i2c/ovti,ov5645.yaml b/Documentation/devicetree/bindings/media/i2c/ovti,ov5645.yaml
new file mode 100644
index 000000000000..0b10483cd267
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/ovti,ov5645.yaml
@@ -0,0 +1,104 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/i2c/ovti,ov5645.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: OmniVision OV5645 Image Sensor Device Tree Bindings
+
+maintainers:
+  - Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
+
+properties:
+  compatible:
+    const: ovti,ov5645
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    description: XCLK Input Clock
+
+  clock-frequency:
+    description: Frequency of the xclk clock in Hz.
+
+  vdda-supply:
+    description: Analog voltage supply, 2.8 volts
+
+  vddd-supply:
+    description: Digital core voltage supply, 1.5 volts
+
+  vdddo-supply:
+    description: Digital I/O voltage supply, 1.8 volts
+
+  enable-gpios:
+    maxItems: 1
+    description:
+      Reference to the GPIO connected to the PWDNB pin, if any.
+
+  reset-gpios:
+    maxItems: 1
+    description:
+      Reference to the GPIO connected to the RESETB pin, if any.
+
+  port:
+    description: Digital Output Port
+    $ref: /schemas/graph.yaml#/$defs/port-base
+    additionalProperties: false
+
+    properties:
+      endpoint:
+        $ref: /schemas/media/video-interfaces.yaml#
+        unevaluatedProperties: false
+
+        properties:
+          data-lanes:
+            minItems: 1
+            maxItems: 2
+            items:
+              enum: [1, 2]
+
+        required:
+          - data-lanes
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - vdddo-supply
+  - vdda-supply
+  - vddd-supply
+  - port
+
+additionalProperties: false
+
+examples:
+  - |
+      #include <dt-bindings/gpio/gpio.h>
+
+      i2c {
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          camera@3c {
+              compatible = "ovti,ov5645";
+              pinctrl-names = "default";
+              pinctrl-0 = <&pinctrl_ov5645>;
+              reg = <0x3c>;
+              clocks = <&clks 1>;
+              clock-frequency = <24000000>;
+              vdddo-supply = <&ov5645_vdddo_1v8>;
+              vdda-supply = <&ov5645_vdda_2v8>;
+              vddd-supply = <&ov5645_vddd_1v5>;
+              enable-gpios = <&gpio1 19 GPIO_ACTIVE_HIGH>;
+              reset-gpios = <&gpio1 20 GPIO_ACTIVE_LOW>;
+
+              port {
+                  ov5645_ep: endpoint {
+                      remote-endpoint = <&csi0_ep>;
+                      data-lanes = <1 2>;
+                  };
+              };
+          };
+      };
+...
-- 
2.25.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v3 6/9] media: i2c: ov5645: Use runtime PM

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Switch to using runtime PM for power management.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
v2->v3
* Jumped to err_pm_runtime label in case of sd register failure
* Now calling pm_runtime_mark_last_busy() before pm_runtime_put_autosuspend()
  call
* Now calling pm_runtime_put_sync() in case s_stream(1) fails
* In s_stream(0) no calling pm_runtime_mark_last_busy() and
  pm_runtime_put_autosuspend()
* Included RB tag from Laurent.

v1->v2
* Moved pm_runtime_*_autosuspend() calls after registering the subdev.
---
 drivers/media/i2c/Kconfig  |   2 +-
 drivers/media/i2c/ov5645.c | 141 +++++++++++++++++++------------------
 2 files changed, 73 insertions(+), 70 deletions(-)

diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 7806d4b81716..c0edd1017fe8 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -459,7 +459,7 @@ config VIDEO_OV5640
 config VIDEO_OV5645
 	tristate "OmniVision OV5645 sensor support"
 	depends on OF
-	depends on I2C && VIDEO_DEV
+	depends on I2C && PM && VIDEO_DEV
 	select MEDIA_CONTROLLER
 	select VIDEO_V4L2_SUBDEV_API
 	select V4L2_FWNODE
diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
index 47451238ca05..4438dc91b82a 100644
--- a/drivers/media/i2c/ov5645.c
+++ b/drivers/media/i2c/ov5645.c
@@ -27,6 +27,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_graph.h>
+#include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <linux/types.h>
@@ -108,7 +109,6 @@ struct ov5645 {
 	u8 timing_tc_reg21;
 
 	struct mutex power_lock; /* lock to protect power state */
-	int power_count;
 
 	struct gpio_desc *enable_gpio;
 	struct gpio_desc *rst_gpio;
@@ -635,8 +635,24 @@ static int ov5645_set_register_array(struct ov5645 *ov5645,
 	return 0;
 }
 
-static int ov5645_set_power_on(struct ov5645 *ov5645)
+static int ov5645_set_power_off(struct device *dev)
 {
+	struct v4l2_subdev *sd = dev_get_drvdata(dev);
+	struct ov5645 *ov5645 = to_ov5645(sd);
+
+	ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x58);
+	gpiod_set_value_cansleep(ov5645->rst_gpio, 1);
+	gpiod_set_value_cansleep(ov5645->enable_gpio, 0);
+	clk_disable_unprepare(ov5645->xclk);
+	regulator_bulk_disable(OV5645_NUM_SUPPLIES, ov5645->supplies);
+
+	return 0;
+}
+
+static int ov5645_set_power_on(struct device *dev)
+{
+	struct v4l2_subdev *sd = dev_get_drvdata(dev);
+	struct ov5645 *ov5645 = to_ov5645(sd);
 	int ret;
 
 	ret = regulator_bulk_enable(OV5645_NUM_SUPPLIES, ov5645->supplies);
@@ -658,57 +674,19 @@ static int ov5645_set_power_on(struct ov5645 *ov5645)
 
 	msleep(20);
 
-	return 0;
-}
-
-static void ov5645_set_power_off(struct ov5645 *ov5645)
-{
-	gpiod_set_value_cansleep(ov5645->rst_gpio, 1);
-	gpiod_set_value_cansleep(ov5645->enable_gpio, 0);
-	clk_disable_unprepare(ov5645->xclk);
-	regulator_bulk_disable(OV5645_NUM_SUPPLIES, ov5645->supplies);
-}
-
-static int ov5645_s_power(struct v4l2_subdev *sd, int on)
-{
-	struct ov5645 *ov5645 = to_ov5645(sd);
-	int ret = 0;
-
-	mutex_lock(&ov5645->power_lock);
-
-	/* If the power count is modified from 0 to != 0 or from != 0 to 0,
-	 * update the power state.
-	 */
-	if (ov5645->power_count == !on) {
-		if (on) {
-			ret = ov5645_set_power_on(ov5645);
-			if (ret < 0)
-				goto exit;
-
-			ret = ov5645_set_register_array(ov5645,
-					ov5645_global_init_setting,
+	ret = ov5645_set_register_array(ov5645, ov5645_global_init_setting,
 					ARRAY_SIZE(ov5645_global_init_setting));
-			if (ret < 0) {
-				dev_err(ov5645->dev,
-					"could not set init registers\n");
-				ov5645_set_power_off(ov5645);
-				goto exit;
-			}
-
-			usleep_range(500, 1000);
-		} else {
-			ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x58);
-			ov5645_set_power_off(ov5645);
-		}
+	if (ret < 0) {
+		dev_err(ov5645->dev, "could not set init registers\n");
+		goto exit;
 	}
 
-	/* Update the power count. */
-	ov5645->power_count += on ? 1 : -1;
-	WARN_ON(ov5645->power_count < 0);
+	usleep_range(500, 1000);
 
-exit:
-	mutex_unlock(&ov5645->power_lock);
+	return 0;
 
+exit:
+	ov5645_set_power_off(dev);
 	return ret;
 }
 
@@ -795,7 +773,7 @@ static int ov5645_s_ctrl(struct v4l2_ctrl *ctrl)
 	int ret;
 
 	mutex_lock(&ov5645->power_lock);
-	if (!ov5645->power_count) {
+	if (!pm_runtime_get_if_in_use(ov5645->dev)) {
 		mutex_unlock(&ov5645->power_lock);
 		return 0;
 	}
@@ -827,6 +805,8 @@ static int ov5645_s_ctrl(struct v4l2_ctrl *ctrl)
 		break;
 	}
 
+	pm_runtime_mark_last_busy(ov5645->dev);
+	pm_runtime_put_autosuspend(ov5645->dev);
 	mutex_unlock(&ov5645->power_lock);
 
 	return ret;
@@ -991,6 +971,10 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
 	int ret;
 
 	if (enable) {
+		ret = pm_runtime_resume_and_get(ov5645->dev);
+		if (ret < 0)
+			return ret;
+
 		ret = ov5645_set_register_array(ov5645,
 					ov5645->current_mode->data,
 					ov5645->current_mode->data_size);
@@ -998,22 +982,22 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
 			dev_err(ov5645->dev, "could not set mode %dx%d\n",
 				ov5645->current_mode->width,
 				ov5645->current_mode->height);
-			return ret;
+			goto err_rpm_put;
 		}
 		ret = v4l2_ctrl_handler_setup(&ov5645->ctrls);
 		if (ret < 0) {
 			dev_err(ov5645->dev, "could not sync v4l2 controls\n");
-			return ret;
+			goto err_rpm_put;
 		}
 
 		ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x45);
 		if (ret < 0)
-			return ret;
+			goto err_rpm_put;
 
 		ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
 				       OV5645_SYSTEM_CTRL0_START);
 		if (ret < 0)
-			return ret;
+			goto err_rpm_put;
 	} else {
 		ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);
 		if (ret < 0)
@@ -1023,14 +1007,17 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
 				       OV5645_SYSTEM_CTRL0_STOP);
 		if (ret < 0)
 			return ret;
+
+		pm_runtime_mark_last_busy(ov5645->dev);
+		pm_runtime_put_autosuspend(ov5645->dev);
 	}
 
 	return 0;
-}
 
-static const struct v4l2_subdev_core_ops ov5645_core_ops = {
-	.s_power = ov5645_s_power,
-};
+err_rpm_put:
+	pm_runtime_put_sync(ov5645->dev);
+	return ret;
+}
 
 static const struct v4l2_subdev_video_ops ov5645_video_ops = {
 	.s_stream = ov5645_s_stream,
@@ -1046,7 +1033,6 @@ static const struct v4l2_subdev_pad_ops ov5645_subdev_pad_ops = {
 };
 
 static const struct v4l2_subdev_ops ov5645_subdev_ops = {
-	.core = &ov5645_core_ops,
 	.video = &ov5645_video_ops,
 	.pad = &ov5645_subdev_pad_ops,
 };
@@ -1188,11 +1174,9 @@ static int ov5645_probe(struct i2c_client *client)
 		goto free_ctrl;
 	}
 
-	ret = ov5645_s_power(&ov5645->sd, true);
-	if (ret < 0) {
-		dev_err(dev, "could not power up OV5645\n");
+	ret = ov5645_set_power_on(dev);
+	if (ret)
 		goto free_entity;
-	}
 
 	ret = ov5645_read_reg(ov5645, OV5645_CHIP_ID_HIGH, &chip_id_high);
 	if (ret < 0 || chip_id_high != OV5645_CHIP_ID_HIGH_BYTE) {
@@ -1209,12 +1193,16 @@ static int ov5645_probe(struct i2c_client *client)
 
 	dev_info(dev, "OV5645 detected at address 0x%02x\n", client->addr);
 
+	pm_runtime_set_active(dev);
+	pm_runtime_get_noresume(dev);
+	pm_runtime_enable(dev);
+
 	ret = ov5645_read_reg(ov5645, OV5645_AEC_PK_MANUAL,
 			      &ov5645->aec_pk_manual);
 	if (ret < 0) {
 		dev_err(dev, "could not read AEC/AGC mode\n");
 		ret = -ENODEV;
-		goto power_down;
+		goto err_pm_runtime;
 	}
 
 	ret = ov5645_read_reg(ov5645, OV5645_TIMING_TC_REG20,
@@ -1222,7 +1210,7 @@ static int ov5645_probe(struct i2c_client *client)
 	if (ret < 0) {
 		dev_err(dev, "could not read vflip value\n");
 		ret = -ENODEV;
-		goto power_down;
+		goto err_pm_runtime;
 	}
 
 	ret = ov5645_read_reg(ov5645, OV5645_TIMING_TC_REG21,
@@ -1230,23 +1218,29 @@ static int ov5645_probe(struct i2c_client *client)
 	if (ret < 0) {
 		dev_err(dev, "could not read hflip value\n");
 		ret = -ENODEV;
-		goto power_down;
+		goto err_pm_runtime;
 	}
 
-	ov5645_s_power(&ov5645->sd, false);
-
 	ret = v4l2_async_register_subdev(&ov5645->sd);
 	if (ret < 0) {
 		dev_err(dev, "could not register v4l2 device\n");
-		goto free_entity;
+		goto err_pm_runtime;
 	}
 
+	pm_runtime_set_autosuspend_delay(dev, 1000);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
+
 	ov5645_entity_init_cfg(&ov5645->sd, NULL);
 
 	return 0;
 
+err_pm_runtime:
+	pm_runtime_disable(dev);
+	pm_runtime_put_noidle(dev);
 power_down:
-	ov5645_s_power(&ov5645->sd, false);
+	ov5645_set_power_off(dev);
 free_entity:
 	media_entity_cleanup(&ov5645->sd.entity);
 free_ctrl:
@@ -1264,6 +1258,10 @@ static void ov5645_remove(struct i2c_client *client)
 	v4l2_async_unregister_subdev(&ov5645->sd);
 	media_entity_cleanup(&ov5645->sd.entity);
 	v4l2_ctrl_handler_free(&ov5645->ctrls);
+	pm_runtime_disable(ov5645->dev);
+	if (!pm_runtime_status_suspended(ov5645->dev))
+		ov5645_set_power_off(ov5645->dev);
+	pm_runtime_set_suspended(ov5645->dev);
 	mutex_destroy(&ov5645->power_lock);
 }
 
@@ -1279,10 +1277,15 @@ static const struct of_device_id ov5645_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, ov5645_of_match);
 
+static const struct dev_pm_ops ov5645_pm_ops = {
+	SET_RUNTIME_PM_OPS(ov5645_set_power_off, ov5645_set_power_on, NULL)
+};
+
 static struct i2c_driver ov5645_i2c_driver = {
 	.driver = {
 		.of_match_table = ov5645_of_match,
 		.name  = "ov5645",
+		.pm = &ov5645_pm_ops,
 	},
 	.probe_new = ov5645_probe,
 	.remove = ov5645_remove,
-- 
2.25.1

[PATCH v3 6/9] media: i2c: ov5645: Use runtime PM

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Switch to using runtime PM for power management.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
v2->v3
* Jumped to err_pm_runtime label in case of sd register failure
* Now calling pm_runtime_mark_last_busy() before pm_runtime_put_autosuspend()
  call
* Now calling pm_runtime_put_sync() in case s_stream(1) fails
* In s_stream(0) no calling pm_runtime_mark_last_busy() and
  pm_runtime_put_autosuspend()
* Included RB tag from Laurent.

v1->v2
* Moved pm_runtime_*_autosuspend() calls after registering the subdev.
---
 drivers/media/i2c/Kconfig  |   2 +-
 drivers/media/i2c/ov5645.c | 141 +++++++++++++++++++------------------
 2 files changed, 73 insertions(+), 70 deletions(-)

diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 7806d4b81716..c0edd1017fe8 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -459,7 +459,7 @@ config VIDEO_OV5640
 config VIDEO_OV5645
 	tristate "OmniVision OV5645 sensor support"
 	depends on OF
-	depends on I2C && VIDEO_DEV
+	depends on I2C && PM && VIDEO_DEV
 	select MEDIA_CONTROLLER
 	select VIDEO_V4L2_SUBDEV_API
 	select V4L2_FWNODE
diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
index 47451238ca05..4438dc91b82a 100644
--- a/drivers/media/i2c/ov5645.c
+++ b/drivers/media/i2c/ov5645.c
@@ -27,6 +27,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_graph.h>
+#include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <linux/types.h>
@@ -108,7 +109,6 @@ struct ov5645 {
 	u8 timing_tc_reg21;
 
 	struct mutex power_lock; /* lock to protect power state */
-	int power_count;
 
 	struct gpio_desc *enable_gpio;
 	struct gpio_desc *rst_gpio;
@@ -635,8 +635,24 @@ static int ov5645_set_register_array(struct ov5645 *ov5645,
 	return 0;
 }
 
-static int ov5645_set_power_on(struct ov5645 *ov5645)
+static int ov5645_set_power_off(struct device *dev)
 {
+	struct v4l2_subdev *sd = dev_get_drvdata(dev);
+	struct ov5645 *ov5645 = to_ov5645(sd);
+
+	ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x58);
+	gpiod_set_value_cansleep(ov5645->rst_gpio, 1);
+	gpiod_set_value_cansleep(ov5645->enable_gpio, 0);
+	clk_disable_unprepare(ov5645->xclk);
+	regulator_bulk_disable(OV5645_NUM_SUPPLIES, ov5645->supplies);
+
+	return 0;
+}
+
+static int ov5645_set_power_on(struct device *dev)
+{
+	struct v4l2_subdev *sd = dev_get_drvdata(dev);
+	struct ov5645 *ov5645 = to_ov5645(sd);
 	int ret;
 
 	ret = regulator_bulk_enable(OV5645_NUM_SUPPLIES, ov5645->supplies);
@@ -658,57 +674,19 @@ static int ov5645_set_power_on(struct ov5645 *ov5645)
 
 	msleep(20);
 
-	return 0;
-}
-
-static void ov5645_set_power_off(struct ov5645 *ov5645)
-{
-	gpiod_set_value_cansleep(ov5645->rst_gpio, 1);
-	gpiod_set_value_cansleep(ov5645->enable_gpio, 0);
-	clk_disable_unprepare(ov5645->xclk);
-	regulator_bulk_disable(OV5645_NUM_SUPPLIES, ov5645->supplies);
-}
-
-static int ov5645_s_power(struct v4l2_subdev *sd, int on)
-{
-	struct ov5645 *ov5645 = to_ov5645(sd);
-	int ret = 0;
-
-	mutex_lock(&ov5645->power_lock);
-
-	/* If the power count is modified from 0 to != 0 or from != 0 to 0,
-	 * update the power state.
-	 */
-	if (ov5645->power_count == !on) {
-		if (on) {
-			ret = ov5645_set_power_on(ov5645);
-			if (ret < 0)
-				goto exit;
-
-			ret = ov5645_set_register_array(ov5645,
-					ov5645_global_init_setting,
+	ret = ov5645_set_register_array(ov5645, ov5645_global_init_setting,
 					ARRAY_SIZE(ov5645_global_init_setting));
-			if (ret < 0) {
-				dev_err(ov5645->dev,
-					"could not set init registers\n");
-				ov5645_set_power_off(ov5645);
-				goto exit;
-			}
-
-			usleep_range(500, 1000);
-		} else {
-			ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x58);
-			ov5645_set_power_off(ov5645);
-		}
+	if (ret < 0) {
+		dev_err(ov5645->dev, "could not set init registers\n");
+		goto exit;
 	}
 
-	/* Update the power count. */
-	ov5645->power_count += on ? 1 : -1;
-	WARN_ON(ov5645->power_count < 0);
+	usleep_range(500, 1000);
 
-exit:
-	mutex_unlock(&ov5645->power_lock);
+	return 0;
 
+exit:
+	ov5645_set_power_off(dev);
 	return ret;
 }
 
@@ -795,7 +773,7 @@ static int ov5645_s_ctrl(struct v4l2_ctrl *ctrl)
 	int ret;
 
 	mutex_lock(&ov5645->power_lock);
-	if (!ov5645->power_count) {
+	if (!pm_runtime_get_if_in_use(ov5645->dev)) {
 		mutex_unlock(&ov5645->power_lock);
 		return 0;
 	}
@@ -827,6 +805,8 @@ static int ov5645_s_ctrl(struct v4l2_ctrl *ctrl)
 		break;
 	}
 
+	pm_runtime_mark_last_busy(ov5645->dev);
+	pm_runtime_put_autosuspend(ov5645->dev);
 	mutex_unlock(&ov5645->power_lock);
 
 	return ret;
@@ -991,6 +971,10 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
 	int ret;
 
 	if (enable) {
+		ret = pm_runtime_resume_and_get(ov5645->dev);
+		if (ret < 0)
+			return ret;
+
 		ret = ov5645_set_register_array(ov5645,
 					ov5645->current_mode->data,
 					ov5645->current_mode->data_size);
@@ -998,22 +982,22 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
 			dev_err(ov5645->dev, "could not set mode %dx%d\n",
 				ov5645->current_mode->width,
 				ov5645->current_mode->height);
-			return ret;
+			goto err_rpm_put;
 		}
 		ret = v4l2_ctrl_handler_setup(&ov5645->ctrls);
 		if (ret < 0) {
 			dev_err(ov5645->dev, "could not sync v4l2 controls\n");
-			return ret;
+			goto err_rpm_put;
 		}
 
 		ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x45);
 		if (ret < 0)
-			return ret;
+			goto err_rpm_put;
 
 		ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
 				       OV5645_SYSTEM_CTRL0_START);
 		if (ret < 0)
-			return ret;
+			goto err_rpm_put;
 	} else {
 		ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);
 		if (ret < 0)
@@ -1023,14 +1007,17 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
 				       OV5645_SYSTEM_CTRL0_STOP);
 		if (ret < 0)
 			return ret;
+
+		pm_runtime_mark_last_busy(ov5645->dev);
+		pm_runtime_put_autosuspend(ov5645->dev);
 	}
 
 	return 0;
-}
 
-static const struct v4l2_subdev_core_ops ov5645_core_ops = {
-	.s_power = ov5645_s_power,
-};
+err_rpm_put:
+	pm_runtime_put_sync(ov5645->dev);
+	return ret;
+}
 
 static const struct v4l2_subdev_video_ops ov5645_video_ops = {
 	.s_stream = ov5645_s_stream,
@@ -1046,7 +1033,6 @@ static const struct v4l2_subdev_pad_ops ov5645_subdev_pad_ops = {
 };
 
 static const struct v4l2_subdev_ops ov5645_subdev_ops = {
-	.core = &ov5645_core_ops,
 	.video = &ov5645_video_ops,
 	.pad = &ov5645_subdev_pad_ops,
 };
@@ -1188,11 +1174,9 @@ static int ov5645_probe(struct i2c_client *client)
 		goto free_ctrl;
 	}
 
-	ret = ov5645_s_power(&ov5645->sd, true);
-	if (ret < 0) {
-		dev_err(dev, "could not power up OV5645\n");
+	ret = ov5645_set_power_on(dev);
+	if (ret)
 		goto free_entity;
-	}
 
 	ret = ov5645_read_reg(ov5645, OV5645_CHIP_ID_HIGH, &chip_id_high);
 	if (ret < 0 || chip_id_high != OV5645_CHIP_ID_HIGH_BYTE) {
@@ -1209,12 +1193,16 @@ static int ov5645_probe(struct i2c_client *client)
 
 	dev_info(dev, "OV5645 detected at address 0x%02x\n", client->addr);
 
+	pm_runtime_set_active(dev);
+	pm_runtime_get_noresume(dev);
+	pm_runtime_enable(dev);
+
 	ret = ov5645_read_reg(ov5645, OV5645_AEC_PK_MANUAL,
 			      &ov5645->aec_pk_manual);
 	if (ret < 0) {
 		dev_err(dev, "could not read AEC/AGC mode\n");
 		ret = -ENODEV;
-		goto power_down;
+		goto err_pm_runtime;
 	}
 
 	ret = ov5645_read_reg(ov5645, OV5645_TIMING_TC_REG20,
@@ -1222,7 +1210,7 @@ static int ov5645_probe(struct i2c_client *client)
 	if (ret < 0) {
 		dev_err(dev, "could not read vflip value\n");
 		ret = -ENODEV;
-		goto power_down;
+		goto err_pm_runtime;
 	}
 
 	ret = ov5645_read_reg(ov5645, OV5645_TIMING_TC_REG21,
@@ -1230,23 +1218,29 @@ static int ov5645_probe(struct i2c_client *client)
 	if (ret < 0) {
 		dev_err(dev, "could not read hflip value\n");
 		ret = -ENODEV;
-		goto power_down;
+		goto err_pm_runtime;
 	}
 
-	ov5645_s_power(&ov5645->sd, false);
-
 	ret = v4l2_async_register_subdev(&ov5645->sd);
 	if (ret < 0) {
 		dev_err(dev, "could not register v4l2 device\n");
-		goto free_entity;
+		goto err_pm_runtime;
 	}
 
+	pm_runtime_set_autosuspend_delay(dev, 1000);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
+
 	ov5645_entity_init_cfg(&ov5645->sd, NULL);
 
 	return 0;
 
+err_pm_runtime:
+	pm_runtime_disable(dev);
+	pm_runtime_put_noidle(dev);
 power_down:
-	ov5645_s_power(&ov5645->sd, false);
+	ov5645_set_power_off(dev);
 free_entity:
 	media_entity_cleanup(&ov5645->sd.entity);
 free_ctrl:
@@ -1264,6 +1258,10 @@ static void ov5645_remove(struct i2c_client *client)
 	v4l2_async_unregister_subdev(&ov5645->sd);
 	media_entity_cleanup(&ov5645->sd.entity);
 	v4l2_ctrl_handler_free(&ov5645->ctrls);
+	pm_runtime_disable(ov5645->dev);
+	if (!pm_runtime_status_suspended(ov5645->dev))
+		ov5645_set_power_off(ov5645->dev);
+	pm_runtime_set_suspended(ov5645->dev);
 	mutex_destroy(&ov5645->power_lock);
 }
 
@@ -1279,10 +1277,15 @@ static const struct of_device_id ov5645_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, ov5645_of_match);
 
+static const struct dev_pm_ops ov5645_pm_ops = {
+	SET_RUNTIME_PM_OPS(ov5645_set_power_off, ov5645_set_power_on, NULL)
+};
+
 static struct i2c_driver ov5645_i2c_driver = {
 	.driver = {
 		.of_match_table = ov5645_of_match,
 		.name  = "ov5645",
+		.pm = &ov5645_pm_ops,
 	},
 	.probe_new = ov5645_probe,
 	.remove = ov5645_remove,
-- 
2.25.1


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[PATCH v3 7/9] media: i2c: ov5645: Drop empty comment

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Drop empty multiline comment.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
v2->v3
* Included RB tag from Laurent.

v1->v2
* No change
---
 drivers/media/i2c/ov5645.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
index 4438dc91b82a..eea3067ddc8b 100644
--- a/drivers/media/i2c/ov5645.c
+++ b/drivers/media/i2c/ov5645.c
@@ -14,9 +14,6 @@
  *   https://www.mail-archive.com/linux-media%40vger.kernel.org/msg92671.html
  */
 
-/*
- */
-
 #include <linux/bitops.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
-- 
2.25.1

[PATCH v3 7/9] media: i2c: ov5645: Drop empty comment

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Drop empty multiline comment.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
v2->v3
* Included RB tag from Laurent.

v1->v2
* No change
---
 drivers/media/i2c/ov5645.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
index 4438dc91b82a..eea3067ddc8b 100644
--- a/drivers/media/i2c/ov5645.c
+++ b/drivers/media/i2c/ov5645.c
@@ -14,9 +14,6 @@
  *   https://www.mail-archive.com/linux-media%40vger.kernel.org/msg92671.html
  */
 
-/*
- */
-
 #include <linux/bitops.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
-- 
2.25.1


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[PATCH v3 8/9] media: i2c: ov5645: Don't return early on failures for s_stream(0)

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Make sure we dont stop the code flow in case of errors while stopping
the stream and return the error code of the first error case if any.

v4l2-core takes care of warning the user so no need to add a warning
message in the driver.

Suggested-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
v2->v3
* Now propagating the first error code in case of failure.

v1->v2
* New patch
---
 drivers/media/i2c/ov5645.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
index eea3067ddc8b..5702a55607fc 100644
--- a/drivers/media/i2c/ov5645.c
+++ b/drivers/media/i2c/ov5645.c
@@ -996,17 +996,22 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
 		if (ret < 0)
 			goto err_rpm_put;
 	} else {
+		int stream_off_ret = 0;
+
 		ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);
 		if (ret < 0)
-			return ret;
+			stream_off_ret = ret;
 
 		ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
 				       OV5645_SYSTEM_CTRL0_STOP);
-		if (ret < 0)
-			return ret;
+		if (ret < 0 && !stream_off_ret)
+			stream_off_ret = ret;
 
 		pm_runtime_mark_last_busy(ov5645->dev);
 		pm_runtime_put_autosuspend(ov5645->dev);
+
+		if (stream_off_ret)
+			return stream_off_ret;
 	}
 
 	return 0;
-- 
2.25.1

[PATCH v3 8/9] media: i2c: ov5645: Don't return early on failures for s_stream(0)

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Make sure we dont stop the code flow in case of errors while stopping
the stream and return the error code of the first error case if any.

v4l2-core takes care of warning the user so no need to add a warning
message in the driver.

Suggested-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
v2->v3
* Now propagating the first error code in case of failure.

v1->v2
* New patch
---
 drivers/media/i2c/ov5645.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
index eea3067ddc8b..5702a55607fc 100644
--- a/drivers/media/i2c/ov5645.c
+++ b/drivers/media/i2c/ov5645.c
@@ -996,17 +996,22 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
 		if (ret < 0)
 			goto err_rpm_put;
 	} else {
+		int stream_off_ret = 0;
+
 		ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);
 		if (ret < 0)
-			return ret;
+			stream_off_ret = ret;
 
 		ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
 				       OV5645_SYSTEM_CTRL0_STOP);
-		if (ret < 0)
-			return ret;
+		if (ret < 0 && !stream_off_ret)
+			stream_off_ret = ret;
 
 		pm_runtime_mark_last_busy(ov5645->dev);
 		pm_runtime_put_autosuspend(ov5645->dev);
+
+		if (stream_off_ret)
+			return stream_off_ret;
 	}
 
 	return 0;
-- 
2.25.1


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[PATCH v3 9/9] media: i2c: ov5645: Call ov5645_entity_init_cfg() before registering the subdev

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Make sure we call ov5645_entity_init_cfg() before registering the subdev
to make sure default formats are set up.

Suggested-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
v2->v3
* Included RB tag from Laurent.

v1->v2
* New patch
---
 drivers/media/i2c/ov5645.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
index 5702a55607fc..73cf6716f3ed 100644
--- a/drivers/media/i2c/ov5645.c
+++ b/drivers/media/i2c/ov5645.c
@@ -1223,6 +1223,8 @@ static int ov5645_probe(struct i2c_client *client)
 		goto err_pm_runtime;
 	}
 
+	ov5645_entity_init_cfg(&ov5645->sd, NULL);
+
 	ret = v4l2_async_register_subdev(&ov5645->sd);
 	if (ret < 0) {
 		dev_err(dev, "could not register v4l2 device\n");
@@ -1234,8 +1236,6 @@ static int ov5645_probe(struct i2c_client *client)
 	pm_runtime_mark_last_busy(dev);
 	pm_runtime_put_autosuspend(dev);
 
-	ov5645_entity_init_cfg(&ov5645->sd, NULL);
-
 	return 0;
 
 err_pm_runtime:
-- 
2.25.1

[PATCH v3 9/9] media: i2c: ov5645: Call ov5645_entity_init_cfg() before registering the subdev

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Make sure we call ov5645_entity_init_cfg() before registering the subdev
to make sure default formats are set up.

Suggested-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
v2->v3
* Included RB tag from Laurent.

v1->v2
* New patch
---
 drivers/media/i2c/ov5645.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
index 5702a55607fc..73cf6716f3ed 100644
--- a/drivers/media/i2c/ov5645.c
+++ b/drivers/media/i2c/ov5645.c
@@ -1223,6 +1223,8 @@ static int ov5645_probe(struct i2c_client *client)
 		goto err_pm_runtime;
 	}
 
+	ov5645_entity_init_cfg(&ov5645->sd, NULL);
+
 	ret = v4l2_async_register_subdev(&ov5645->sd);
 	if (ret < 0) {
 		dev_err(dev, "could not register v4l2 device\n");
@@ -1234,8 +1236,6 @@ static int ov5645_probe(struct i2c_client *client)
 	pm_runtime_mark_last_busy(dev);
 	pm_runtime_put_autosuspend(dev);
 
-	ov5645_entity_init_cfg(&ov5645->sd, NULL);
-
 	return 0;
 
 err_pm_runtime:
-- 
2.25.1


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Re: [PATCH v3 8/9] media: i2c: ov5645: Don't return early on failures for s_stream(0)

[Marco Felsch]

Hi Prabhakar,

thanks for the patch, please see below my comments.

On 22-10-26, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> 
> Make sure we dont stop the code flow in case of errors while stopping
> the stream and return the error code of the first error case if any.
> 
> v4l2-core takes care of warning the user so no need to add a warning
> message in the driver.
> 
> Suggested-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
> v2->v3
> * Now propagating the first error code in case of failure.
> 
> v1->v2
> * New patch
> ---
>  drivers/media/i2c/ov5645.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
> index eea3067ddc8b..5702a55607fc 100644
> --- a/drivers/media/i2c/ov5645.c
> +++ b/drivers/media/i2c/ov5645.c
> @@ -996,17 +996,22 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
>  		if (ret < 0)
>  			goto err_rpm_put;
>  	} else {
> +		int stream_off_ret = 0;
> +
>  		ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);

If this write failed..

>  		if (ret < 0)
> -			return ret;
> +			stream_off_ret = ret;
>  
>  		ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
>  				       OV5645_SYSTEM_CTRL0_STOP);

why should this write be successful?

Regards,
  Marco

> -		if (ret < 0)
> -			return ret;
> +		if (ret < 0 && !stream_off_ret)
> +			stream_off_ret = ret;
>  
>  		pm_runtime_mark_last_busy(ov5645->dev);
>  		pm_runtime_put_autosuspend(ov5645->dev);
> +
> +		if (stream_off_ret)
> +			return stream_off_ret;
>  	}
>  
>  	return 0;
> -- 
> 2.25.1
> 
> 
> 

Re: [PATCH v3 8/9] media: i2c: ov5645: Don't return early on failures for s_stream(0)

[Marco Felsch]

Hi Prabhakar,

thanks for the patch, please see below my comments.

On 22-10-26, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> 
> Make sure we dont stop the code flow in case of errors while stopping
> the stream and return the error code of the first error case if any.
> 
> v4l2-core takes care of warning the user so no need to add a warning
> message in the driver.
> 
> Suggested-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
> v2->v3
> * Now propagating the first error code in case of failure.
> 
> v1->v2
> * New patch
> ---
>  drivers/media/i2c/ov5645.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
> index eea3067ddc8b..5702a55607fc 100644
> --- a/drivers/media/i2c/ov5645.c
> +++ b/drivers/media/i2c/ov5645.c
> @@ -996,17 +996,22 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
>  		if (ret < 0)
>  			goto err_rpm_put;
>  	} else {
> +		int stream_off_ret = 0;
> +
>  		ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);

If this write failed..

>  		if (ret < 0)
> -			return ret;
> +			stream_off_ret = ret;
>  
>  		ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
>  				       OV5645_SYSTEM_CTRL0_STOP);

why should this write be successful?

Regards,
  Marco

> -		if (ret < 0)
> -			return ret;
> +		if (ret < 0 && !stream_off_ret)
> +			stream_off_ret = ret;
>  
>  		pm_runtime_mark_last_busy(ov5645->dev);
>  		pm_runtime_put_autosuspend(ov5645->dev);
> +
> +		if (stream_off_ret)
> +			return stream_off_ret;
>  	}
>  
>  	return 0;
> -- 
> 2.25.1
> 
> 
> 

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Re: [PATCH v3 8/9] media: i2c: ov5645: Don't return early on failures for s_stream(0)

[Lad, Prabhakar]

Hi Marco,

Thank you for the review.

On Wed, Oct 26, 2022 at 6:17 PM Marco Felsch <m.felsch@pengutronix.de> wrote:
>
> Hi Prabhakar,
>
> thanks for the patch, please see below my comments.
>
> On 22-10-26, Prabhakar wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> >
> > Make sure we dont stop the code flow in case of errors while stopping
> > the stream and return the error code of the first error case if any.
> >
> > v4l2-core takes care of warning the user so no need to add a warning
> > message in the driver.
> >
> > Suggested-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > ---
> > v2->v3
> > * Now propagating the first error code in case of failure.
> >
> > v1->v2
> > * New patch
> > ---
> >  drivers/media/i2c/ov5645.c | 11 ++++++++---
> >  1 file changed, 8 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
> > index eea3067ddc8b..5702a55607fc 100644
> > --- a/drivers/media/i2c/ov5645.c
> > +++ b/drivers/media/i2c/ov5645.c
> > @@ -996,17 +996,22 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> >               if (ret < 0)
> >                       goto err_rpm_put;
> >       } else {
> > +             int stream_off_ret = 0;
> > +
> >               ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);
>
> If this write failed..
>
> >               if (ret < 0)
> > -                     return ret;
> > +                     stream_off_ret = ret;
> >
> >               ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
> >                                      OV5645_SYSTEM_CTRL0_STOP);
>
> why should this write be successful?
>
Indeed that will fail unless I have a lucky day ;-)

But it seemed to be an overkill for adding an additional check to see
if the previous write succeeded. Do you think this will create an
issue?

Cheers,
Prabhakar

Re: [PATCH v3 8/9] media: i2c: ov5645: Don't return early on failures for s_stream(0)

[Lad, Prabhakar]

Hi Marco,

Thank you for the review.

On Wed, Oct 26, 2022 at 6:17 PM Marco Felsch <m.felsch@pengutronix.de> wrote:
>
> Hi Prabhakar,
>
> thanks for the patch, please see below my comments.
>
> On 22-10-26, Prabhakar wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> >
> > Make sure we dont stop the code flow in case of errors while stopping
> > the stream and return the error code of the first error case if any.
> >
> > v4l2-core takes care of warning the user so no need to add a warning
> > message in the driver.
> >
> > Suggested-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > ---
> > v2->v3
> > * Now propagating the first error code in case of failure.
> >
> > v1->v2
> > * New patch
> > ---
> >  drivers/media/i2c/ov5645.c | 11 ++++++++---
> >  1 file changed, 8 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
> > index eea3067ddc8b..5702a55607fc 100644
> > --- a/drivers/media/i2c/ov5645.c
> > +++ b/drivers/media/i2c/ov5645.c
> > @@ -996,17 +996,22 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> >               if (ret < 0)
> >                       goto err_rpm_put;
> >       } else {
> > +             int stream_off_ret = 0;
> > +
> >               ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);
>
> If this write failed..
>
> >               if (ret < 0)
> > -                     return ret;
> > +                     stream_off_ret = ret;
> >
> >               ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
> >                                      OV5645_SYSTEM_CTRL0_STOP);
>
> why should this write be successful?
>
Indeed that will fail unless I have a lucky day ;-)

But it seemed to be an overkill for adding an additional check to see
if the previous write succeeded. Do you think this will create an
issue?

Cheers,
Prabhakar

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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH v3 8/9] media: i2c: ov5645: Don't return early on failures for s_stream(0)

[Marco Felsch]

On 22-10-26, Lad, Prabhakar wrote:
> Hi Marco,
> 
> Thank you for the review.
> 
> On Wed, Oct 26, 2022 at 6:17 PM Marco Felsch <m.felsch@pengutronix.de> wrote:
> >
> > Hi Prabhakar,
> >
> > thanks for the patch, please see below my comments.
> >
> > On 22-10-26, Prabhakar wrote:
> > > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > >
> > > Make sure we dont stop the code flow in case of errors while stopping
> > > the stream and return the error code of the first error case if any.
> > >
> > > v4l2-core takes care of warning the user so no need to add a warning
> > > message in the driver.
> > >
> > > Suggested-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > > ---
> > > v2->v3
> > > * Now propagating the first error code in case of failure.
> > >
> > > v1->v2
> > > * New patch
> > > ---
> > >  drivers/media/i2c/ov5645.c | 11 ++++++++---
> > >  1 file changed, 8 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
> > > index eea3067ddc8b..5702a55607fc 100644
> > > --- a/drivers/media/i2c/ov5645.c
> > > +++ b/drivers/media/i2c/ov5645.c
> > > @@ -996,17 +996,22 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> > >               if (ret < 0)
> > >                       goto err_rpm_put;
> > >       } else {
> > > +             int stream_off_ret = 0;
> > > +
> > >               ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);
> >
> > If this write failed..
> >
> > >               if (ret < 0)
> > > -                     return ret;
> > > +                     stream_off_ret = ret;
> > >
> > >               ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
> > >                                      OV5645_SYSTEM_CTRL0_STOP);
> >
> > why should this write be successful?
> >
> Indeed that will fail unless I have a lucky day ;-)
> 
> But it seemed to be an overkill for adding an additional check to see
> if the previous write succeeded. Do you think this will create an
> issue?

Why not just say?

	ret = ov5645_write_reg();
	if (ret < 0)
		goto out;

	...

	out:

	dev_pm_xxx();

	return ret;

Regards,
  Marco

Re: [PATCH v3 8/9] media: i2c: ov5645: Don't return early on failures for s_stream(0)

[Marco Felsch]

On 22-10-26, Lad, Prabhakar wrote:
> Hi Marco,
> 
> Thank you for the review.
> 
> On Wed, Oct 26, 2022 at 6:17 PM Marco Felsch <m.felsch@pengutronix.de> wrote:
> >
> > Hi Prabhakar,
> >
> > thanks for the patch, please see below my comments.
> >
> > On 22-10-26, Prabhakar wrote:
> > > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > >
> > > Make sure we dont stop the code flow in case of errors while stopping
> > > the stream and return the error code of the first error case if any.
> > >
> > > v4l2-core takes care of warning the user so no need to add a warning
> > > message in the driver.
> > >
> > > Suggested-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > > ---
> > > v2->v3
> > > * Now propagating the first error code in case of failure.
> > >
> > > v1->v2
> > > * New patch
> > > ---
> > >  drivers/media/i2c/ov5645.c | 11 ++++++++---
> > >  1 file changed, 8 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
> > > index eea3067ddc8b..5702a55607fc 100644
> > > --- a/drivers/media/i2c/ov5645.c
> > > +++ b/drivers/media/i2c/ov5645.c
> > > @@ -996,17 +996,22 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> > >               if (ret < 0)
> > >                       goto err_rpm_put;
> > >       } else {
> > > +             int stream_off_ret = 0;
> > > +
> > >               ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);
> >
> > If this write failed..
> >
> > >               if (ret < 0)
> > > -                     return ret;
> > > +                     stream_off_ret = ret;
> > >
> > >               ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
> > >                                      OV5645_SYSTEM_CTRL0_STOP);
> >
> > why should this write be successful?
> >
> Indeed that will fail unless I have a lucky day ;-)
> 
> But it seemed to be an overkill for adding an additional check to see
> if the previous write succeeded. Do you think this will create an
> issue?

Why not just say?

	ret = ov5645_write_reg();
	if (ret < 0)
		goto out;

	...

	out:

	dev_pm_xxx();

	return ret;

Regards,
  Marco

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Re: [PATCH v3 8/9] media: i2c: ov5645: Don't return early on failures for s_stream(0)

[Lad, Prabhakar]

Hi Marco,

On Wed, Oct 26, 2022 at 6:35 PM Marco Felsch <m.felsch@pengutronix.de> wrote:
>
> On 22-10-26, Lad, Prabhakar wrote:
> > Hi Marco,
> >
> > Thank you for the review.
> >
> > On Wed, Oct 26, 2022 at 6:17 PM Marco Felsch <m.felsch@pengutronix.de> wrote:
> > >
> > > Hi Prabhakar,
> > >
> > > thanks for the patch, please see below my comments.
> > >
> > > On 22-10-26, Prabhakar wrote:
> > > > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > > >
> > > > Make sure we dont stop the code flow in case of errors while stopping
> > > > the stream and return the error code of the first error case if any.
> > > >
> > > > v4l2-core takes care of warning the user so no need to add a warning
> > > > message in the driver.
> > > >
> > > > Suggested-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > > > ---
> > > > v2->v3
> > > > * Now propagating the first error code in case of failure.
> > > >
> > > > v1->v2
> > > > * New patch
> > > > ---
> > > >  drivers/media/i2c/ov5645.c | 11 ++++++++---
> > > >  1 file changed, 8 insertions(+), 3 deletions(-)
> > > >
> > > > diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
> > > > index eea3067ddc8b..5702a55607fc 100644
> > > > --- a/drivers/media/i2c/ov5645.c
> > > > +++ b/drivers/media/i2c/ov5645.c
> > > > @@ -996,17 +996,22 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> > > >               if (ret < 0)
> > > >                       goto err_rpm_put;
> > > >       } else {
> > > > +             int stream_off_ret = 0;
> > > > +
> > > >               ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);
> > >
> > > If this write failed..
> > >
> > > >               if (ret < 0)
> > > > -                     return ret;
> > > > +                     stream_off_ret = ret;
> > > >
> > > >               ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
> > > >                                      OV5645_SYSTEM_CTRL0_STOP);
> > >
> > > why should this write be successful?
> > >
> > Indeed that will fail unless I have a lucky day ;-)
> >
> > But it seemed to be an overkill for adding an additional check to see
> > if the previous write succeeded. Do you think this will create an
> > issue?
>
> Why not just say?
>
>         ret = ov5645_write_reg();
>         if (ret < 0)
>                 goto out;
>
>         ...
>
>         out:
>
>         dev_pm_xxx();
>
>         return ret;
>
Thanks for the suggestion, I will rework this in the next version.

Cheers,
Prabhakar

Re: [PATCH v3 8/9] media: i2c: ov5645: Don't return early on failures for s_stream(0)

[Lad, Prabhakar]

Hi Marco,

On Wed, Oct 26, 2022 at 6:35 PM Marco Felsch <m.felsch@pengutronix.de> wrote:
>
> On 22-10-26, Lad, Prabhakar wrote:
> > Hi Marco,
> >
> > Thank you for the review.
> >
> > On Wed, Oct 26, 2022 at 6:17 PM Marco Felsch <m.felsch@pengutronix.de> wrote:
> > >
> > > Hi Prabhakar,
> > >
> > > thanks for the patch, please see below my comments.
> > >
> > > On 22-10-26, Prabhakar wrote:
> > > > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > > >
> > > > Make sure we dont stop the code flow in case of errors while stopping
> > > > the stream and return the error code of the first error case if any.
> > > >
> > > > v4l2-core takes care of warning the user so no need to add a warning
> > > > message in the driver.
> > > >
> > > > Suggested-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > > > ---
> > > > v2->v3
> > > > * Now propagating the first error code in case of failure.
> > > >
> > > > v1->v2
> > > > * New patch
> > > > ---
> > > >  drivers/media/i2c/ov5645.c | 11 ++++++++---
> > > >  1 file changed, 8 insertions(+), 3 deletions(-)
> > > >
> > > > diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
> > > > index eea3067ddc8b..5702a55607fc 100644
> > > > --- a/drivers/media/i2c/ov5645.c
> > > > +++ b/drivers/media/i2c/ov5645.c
> > > > @@ -996,17 +996,22 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> > > >               if (ret < 0)
> > > >                       goto err_rpm_put;
> > > >       } else {
> > > > +             int stream_off_ret = 0;
> > > > +
> > > >               ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);
> > >
> > > If this write failed..
> > >
> > > >               if (ret < 0)
> > > > -                     return ret;
> > > > +                     stream_off_ret = ret;
> > > >
> > > >               ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
> > > >                                      OV5645_SYSTEM_CTRL0_STOP);
> > >
> > > why should this write be successful?
> > >
> > Indeed that will fail unless I have a lucky day ;-)
> >
> > But it seemed to be an overkill for adding an additional check to see
> > if the previous write succeeded. Do you think this will create an
> > issue?
>
> Why not just say?
>
>         ret = ov5645_write_reg();
>         if (ret < 0)
>                 goto out;
>
>         ...
>
>         out:
>
>         dev_pm_xxx();
>
>         return ret;
>
Thanks for the suggestion, I will rework this in the next version.

Cheers,
Prabhakar

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Re: [PATCH v3 5/9] media: dt-bindings: ov5645: Convert OV5645 binding to a schema

[Krzysztof Kozlowski]

On 26/10/2022 09:06, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> 
> Convert the simple OV5645 Device Tree binding to json-schema.
> 
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - vdddo-supply
> +  - vdda-supply
> +  - vddd-supply
> +  - port
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +      #include <dt-bindings/gpio/gpio.h>

Use 4 spaces for example indentation.

> +
> +      i2c {
> +          #address-cells = <1>;
> +          #size-cells = <0>;
> +
> +          camera@3c {
> +              compatible = "ovti,ov5645";
> +              pinctrl-names = "default";
> +              pinctrl-0 = <&pinctrl_ov5645>;
> +              reg = <0x3c>;

reg goes after compatible.

> +              clocks = <&clks 1>;

Best regards,
Krzysztof

Re: [PATCH v3 5/9] media: dt-bindings: ov5645: Convert OV5645 binding to a schema

[Krzysztof Kozlowski]

On 26/10/2022 09:06, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> 
> Convert the simple OV5645 Device Tree binding to json-schema.
> 
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - vdddo-supply
> +  - vdda-supply
> +  - vddd-supply
> +  - port
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +      #include <dt-bindings/gpio/gpio.h>

Use 4 spaces for example indentation.

> +
> +      i2c {
> +          #address-cells = <1>;
> +          #size-cells = <0>;
> +
> +          camera@3c {
> +              compatible = "ovti,ov5645";
> +              pinctrl-names = "default";
> +              pinctrl-0 = <&pinctrl_ov5645>;
> +              reg = <0x3c>;

reg goes after compatible.

> +              clocks = <&clks 1>;

Best regards,
Krzysztof


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Re: [PATCH v3 6/9] media: i2c: ov5645: Use runtime PM

[Sakari Ailus]

Hi Prabhakar,

Thanks for the update.

On Wed, Oct 26, 2022 at 02:06:55PM +0100, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> 
> Switch to using runtime PM for power management.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> ---
> v2->v3
> * Jumped to err_pm_runtime label in case of sd register failure
> * Now calling pm_runtime_mark_last_busy() before pm_runtime_put_autosuspend()
>   call
> * Now calling pm_runtime_put_sync() in case s_stream(1) fails
> * In s_stream(0) no calling pm_runtime_mark_last_busy() and
>   pm_runtime_put_autosuspend()
> * Included RB tag from Laurent.
> 
> v1->v2
> * Moved pm_runtime_*_autosuspend() calls after registering the subdev.
> ---
>  drivers/media/i2c/Kconfig  |   2 +-
>  drivers/media/i2c/ov5645.c | 141 +++++++++++++++++++------------------
>  2 files changed, 73 insertions(+), 70 deletions(-)
> 
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 7806d4b81716..c0edd1017fe8 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -459,7 +459,7 @@ config VIDEO_OV5640
>  config VIDEO_OV5645
>  	tristate "OmniVision OV5645 sensor support"
>  	depends on OF
> -	depends on I2C && VIDEO_DEV
> +	depends on I2C && PM && VIDEO_DEV

I think you can drop the PM dependency --- the driver will work fine
without CONFIG_PM.

Although one could question why do we have CONFIG_PM. Some systems won't
boot without it and who would want to consume more power than necessary?

Could this be removed altogether? Or perhaps we could add CONFIG_PM
dependency to V4L2 and DVB? :-)

Certainly out of scope of this set though.

-- 
Kind regards,

Sakari Ailus

Re: [PATCH v3 6/9] media: i2c: ov5645: Use runtime PM

[Sakari Ailus]

Hi Prabhakar,

Thanks for the update.

On Wed, Oct 26, 2022 at 02:06:55PM +0100, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> 
> Switch to using runtime PM for power management.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> ---
> v2->v3
> * Jumped to err_pm_runtime label in case of sd register failure
> * Now calling pm_runtime_mark_last_busy() before pm_runtime_put_autosuspend()
>   call
> * Now calling pm_runtime_put_sync() in case s_stream(1) fails
> * In s_stream(0) no calling pm_runtime_mark_last_busy() and
>   pm_runtime_put_autosuspend()
> * Included RB tag from Laurent.
> 
> v1->v2
> * Moved pm_runtime_*_autosuspend() calls after registering the subdev.
> ---
>  drivers/media/i2c/Kconfig  |   2 +-
>  drivers/media/i2c/ov5645.c | 141 +++++++++++++++++++------------------
>  2 files changed, 73 insertions(+), 70 deletions(-)
> 
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 7806d4b81716..c0edd1017fe8 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -459,7 +459,7 @@ config VIDEO_OV5640
>  config VIDEO_OV5645
>  	tristate "OmniVision OV5645 sensor support"
>  	depends on OF
> -	depends on I2C && VIDEO_DEV
> +	depends on I2C && PM && VIDEO_DEV

I think you can drop the PM dependency --- the driver will work fine
without CONFIG_PM.

Although one could question why do we have CONFIG_PM. Some systems won't
boot without it and who would want to consume more power than necessary?

Could this be removed altogether? Or perhaps we could add CONFIG_PM
dependency to V4L2 and DVB? :-)

Certainly out of scope of this set though.

-- 
Kind regards,

Sakari Ailus

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Re: [PATCH v3 0/9] media: i2c: ov5645 driver enhancements

[Sakari Ailus]

Hello,

On Wed, Oct 26, 2022 at 02:06:49PM +0100, Prabhakar wrote:
>   ARM: dts: imx6qdl-pico: Drop clock-names property
>   ARM: dts: imx6qdl-wandboard: Drop clock-names property
>   arm64: dts: renesas: aistarvision-mipi-adapter-2.1: Drop clock-names
>     property

Are Freescale/Renesas arch maintainers fine with me taking these patches
or should they be merged through another tree?

Thanks.

-- 
Kind regards,

Sakari Ailus

Re: [PATCH v3 0/9] media: i2c: ov5645 driver enhancements

[Sakari Ailus]

Hello,

On Wed, Oct 26, 2022 at 02:06:49PM +0100, Prabhakar wrote:
>   ARM: dts: imx6qdl-pico: Drop clock-names property
>   ARM: dts: imx6qdl-wandboard: Drop clock-names property
>   arm64: dts: renesas: aistarvision-mipi-adapter-2.1: Drop clock-names
>     property

Are Freescale/Renesas arch maintainers fine with me taking these patches
or should they be merged through another tree?

Thanks.

-- 
Kind regards,

Sakari Ailus

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Re: [PATCH v3 6/9] media: i2c: ov5645: Use runtime PM

[Lad, Prabhakar]

Hi Sakari,

On Thu, Oct 27, 2022 at 10:22 AM Sakari Ailus
<sakari.ailus@linux.intel.com> wrote:
>
> Hi Prabhakar,
>
> Thanks for the update.
>
> On Wed, Oct 26, 2022 at 02:06:55PM +0100, Prabhakar wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> >
> > Switch to using runtime PM for power management.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > ---
> > v2->v3
> > * Jumped to err_pm_runtime label in case of sd register failure
> > * Now calling pm_runtime_mark_last_busy() before pm_runtime_put_autosuspend()
> >   call
> > * Now calling pm_runtime_put_sync() in case s_stream(1) fails
> > * In s_stream(0) no calling pm_runtime_mark_last_busy() and
> >   pm_runtime_put_autosuspend()
> > * Included RB tag from Laurent.
> >
> > v1->v2
> > * Moved pm_runtime_*_autosuspend() calls after registering the subdev.
> > ---
> >  drivers/media/i2c/Kconfig  |   2 +-
> >  drivers/media/i2c/ov5645.c | 141 +++++++++++++++++++------------------
> >  2 files changed, 73 insertions(+), 70 deletions(-)
> >
> > diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> > index 7806d4b81716..c0edd1017fe8 100644
> > --- a/drivers/media/i2c/Kconfig
> > +++ b/drivers/media/i2c/Kconfig
> > @@ -459,7 +459,7 @@ config VIDEO_OV5640
> >  config VIDEO_OV5645
> >       tristate "OmniVision OV5645 sensor support"
> >       depends on OF
> > -     depends on I2C && VIDEO_DEV
> > +     depends on I2C && PM && VIDEO_DEV
>
> I think you can drop the PM dependency --- the driver will work fine
> without CONFIG_PM.
>
Agreed, I'll send a new version dropping this and fixing the comments
on patch #5 and patch #8.

> Although one could question why do we have CONFIG_PM. Some systems won't
> boot without it and who would want to consume more power than necessary?
>
> Could this be removed altogether? Or perhaps we could add CONFIG_PM
> dependency to V4L2 and DVB? :-)
>
Or rather this option should be selected by the platform itself rather
than subsystem?

Cheers,
Prabhakar

Re: [PATCH v3 6/9] media: i2c: ov5645: Use runtime PM

[Lad, Prabhakar]

Hi Sakari,

On Thu, Oct 27, 2022 at 10:22 AM Sakari Ailus
<sakari.ailus@linux.intel.com> wrote:
>
> Hi Prabhakar,
>
> Thanks for the update.
>
> On Wed, Oct 26, 2022 at 02:06:55PM +0100, Prabhakar wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> >
> > Switch to using runtime PM for power management.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > ---
> > v2->v3
> > * Jumped to err_pm_runtime label in case of sd register failure
> > * Now calling pm_runtime_mark_last_busy() before pm_runtime_put_autosuspend()
> >   call
> > * Now calling pm_runtime_put_sync() in case s_stream(1) fails
> > * In s_stream(0) no calling pm_runtime_mark_last_busy() and
> >   pm_runtime_put_autosuspend()
> > * Included RB tag from Laurent.
> >
> > v1->v2
> > * Moved pm_runtime_*_autosuspend() calls after registering the subdev.
> > ---
> >  drivers/media/i2c/Kconfig  |   2 +-
> >  drivers/media/i2c/ov5645.c | 141 +++++++++++++++++++------------------
> >  2 files changed, 73 insertions(+), 70 deletions(-)
> >
> > diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> > index 7806d4b81716..c0edd1017fe8 100644
> > --- a/drivers/media/i2c/Kconfig
> > +++ b/drivers/media/i2c/Kconfig
> > @@ -459,7 +459,7 @@ config VIDEO_OV5640
> >  config VIDEO_OV5645
> >       tristate "OmniVision OV5645 sensor support"
> >       depends on OF
> > -     depends on I2C && VIDEO_DEV
> > +     depends on I2C && PM && VIDEO_DEV
>
> I think you can drop the PM dependency --- the driver will work fine
> without CONFIG_PM.
>
Agreed, I'll send a new version dropping this and fixing the comments
on patch #5 and patch #8.

> Although one could question why do we have CONFIG_PM. Some systems won't
> boot without it and who would want to consume more power than necessary?
>
> Could this be removed altogether? Or perhaps we could add CONFIG_PM
> dependency to V4L2 and DVB? :-)
>
Or rather this option should be selected by the platform itself rather
than subsystem?

Cheers,
Prabhakar

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Re: [PATCH v3 4/9] arm64: dts: renesas: aistarvision-mipi-adapter-2.1: Drop clock-names property

[Geert Uytterhoeven]

On Wed, Oct 26, 2022 at 3:07 PM Prabhakar <prabhakar.csengg@gmail.com> wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
>
> Now that the driver has been updated to drop fetching the clk reference by
> name we no longer need the clock-names property in the ov5645 sensor node.
>
> This is in preparation for removal for clock-names property from the DT
> binding.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
> v3
> * New patch

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH v3 4/9] arm64: dts: renesas: aistarvision-mipi-adapter-2.1: Drop clock-names property

[Geert Uytterhoeven]

On Wed, Oct 26, 2022 at 3:07 PM Prabhakar <prabhakar.csengg@gmail.com> wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
>
> Now that the driver has been updated to drop fetching the clk reference by
> name we no longer need the clock-names property in the ov5645 sensor node.
>
> This is in preparation for removal for clock-names property from the DT
> binding.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
> v3
> * New patch

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

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Re: [PATCH v3 0/9] media: i2c: ov5645 driver enhancements

[Shawn Guo]

On Thu, Oct 27, 2022 at 09:32:20AM +0000, Sakari Ailus wrote:
> Hello,
> 
> On Wed, Oct 26, 2022 at 02:06:49PM +0100, Prabhakar wrote:
> >   ARM: dts: imx6qdl-pico: Drop clock-names property
> >   ARM: dts: imx6qdl-wandboard: Drop clock-names property
> >   arm64: dts: renesas: aistarvision-mipi-adapter-2.1: Drop clock-names
> >     property
> 
> Are Freescale/Renesas arch maintainers fine with me taking these patches
> or should they be merged through another tree?

Go ahead to take i.MX DTS patches:

Acked-by: Shawn Guo <shawnguo@kernel.org>

Re: [PATCH v3 0/9] media: i2c: ov5645 driver enhancements

[Shawn Guo]

On Thu, Oct 27, 2022 at 09:32:20AM +0000, Sakari Ailus wrote:
> Hello,
> 
> On Wed, Oct 26, 2022 at 02:06:49PM +0100, Prabhakar wrote:
> >   ARM: dts: imx6qdl-pico: Drop clock-names property
> >   ARM: dts: imx6qdl-wandboard: Drop clock-names property
> >   arm64: dts: renesas: aistarvision-mipi-adapter-2.1: Drop clock-names
> >     property
> 
> Are Freescale/Renesas arch maintainers fine with me taking these patches
> or should they be merged through another tree?

Go ahead to take i.MX DTS patches:

Acked-by: Shawn Guo <shawnguo@kernel.org>

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Re: [PATCH v3 0/9] media: i2c: ov5645 driver enhancements

[Sakari Ailus]

On Sat, Oct 29, 2022 at 08:54:12PM +0800, Shawn Guo wrote:
> On Thu, Oct 27, 2022 at 09:32:20AM +0000, Sakari Ailus wrote:
> > Hello,
> > 
> > On Wed, Oct 26, 2022 at 02:06:49PM +0100, Prabhakar wrote:
> > >   ARM: dts: imx6qdl-pico: Drop clock-names property
> > >   ARM: dts: imx6qdl-wandboard: Drop clock-names property
> > >   arm64: dts: renesas: aistarvision-mipi-adapter-2.1: Drop clock-names
> > >     property
> > 
> > Are Freescale/Renesas arch maintainers fine with me taking these patches
> > or should they be merged through another tree?
> 
> Go ahead to take i.MX DTS patches:
> 
> Acked-by: Shawn Guo <shawnguo@kernel.org>

Thanks, Shawn and Geert!

-- 
Sakari Ailus

Re: [PATCH v3 0/9] media: i2c: ov5645 driver enhancements

[Sakari Ailus]

On Sat, Oct 29, 2022 at 08:54:12PM +0800, Shawn Guo wrote:
> On Thu, Oct 27, 2022 at 09:32:20AM +0000, Sakari Ailus wrote:
> > Hello,
> > 
> > On Wed, Oct 26, 2022 at 02:06:49PM +0100, Prabhakar wrote:
> > >   ARM: dts: imx6qdl-pico: Drop clock-names property
> > >   ARM: dts: imx6qdl-wandboard: Drop clock-names property
> > >   arm64: dts: renesas: aistarvision-mipi-adapter-2.1: Drop clock-names
> > >     property
> > 
> > Are Freescale/Renesas arch maintainers fine with me taking these patches
> > or should they be merged through another tree?
> 
> Go ahead to take i.MX DTS patches:
> 
> Acked-by: Shawn Guo <shawnguo@kernel.org>

Thanks, Shawn and Geert!

-- 
Sakari Ailus

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