linux-kernel - Re: [PATCH v2 05/12] media: ipu-bridge: Use v4l2

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Message-ID: <aGw_1T_Edm8--gXW@kekkonen.localdomain>
Date: Mon, 7 Jul 2025 21:44:53 +0000
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: Ricardo Ribalda <ribalda@...omium.org>
Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Hans de Goede <hdegoede@...hat.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Hans Verkuil <hverkuil@...all.nl>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org, linux-gpio@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 05/12] media: ipu-bridge: Use v4l2_fwnode for unknown
 rotations

Hi Ricardo,

On Thu, Jun 05, 2025 at 05:52:58PM +0000, Ricardo Ribalda wrote:
> The v4l2_fwnode_device_properties contains information about the
> rotation. Use it if the ssdb data is inconclusive.

As SSDB and _PLD provide the same information, are they always aligned? Do
you have any experience on how is this actually in firmware?

_PLD is standardised so it would seem reasonable to stick to that -- if it
exists. Another approach could be to pick the one that doesn't translate to
a sane default (0°).

> 
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
>  drivers/media/pci/intel/ipu-bridge.c | 30 +++++++++++++++++++-----------
>  1 file changed, 19 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/media/pci/intel/ipu-bridge.c b/drivers/media/pci/intel/ipu-bridge.c
> index 020aa52f590d66b6d333adc56ebfb9ab0561db51..6f436a8b4d23373af8a6668530333a827eca467a 100644
> --- a/drivers/media/pci/intel/ipu-bridge.c
> +++ b/drivers/media/pci/intel/ipu-bridge.c
> @@ -236,37 +236,41 @@ static int ipu_bridge_read_acpi_buffer(struct acpi_device *adev, char *id,
>  }
>  
>  static u32 ipu_bridge_parse_rotation(struct acpi_device *adev,
> -				     struct ipu_sensor_ssdb *ssdb)
> +				     struct ipu_sensor_ssdb *ssdb,
> +				     struct v4l2_fwnode_device_properties *props)
>  {
>  	switch (ssdb->degree) {
>  	case IPU_SENSOR_ROTATION_NORMAL:
>  		return 0;
>  	case IPU_SENSOR_ROTATION_INVERTED:
>  		return 180;
> -	default:
> +	}
> +
> +	if (props->rotation == V4L2_FWNODE_PROPERTY_UNSET) {
>  		dev_warn(ADEV_DEV(adev),
>  			 "Unknown rotation %d. Assume 0 degree rotation\n",
>  			 ssdb->degree);
>  		return 0;
>  	}
> +
> +	return props->rotation;
>  }
>  
> -static enum v4l2_fwnode_orientation ipu_bridge_parse_orientation(struct acpi_device *adev)
> +static enum v4l2_fwnode_orientation
> +ipu_bridge_parse_orientation(struct acpi_device *adev,
> +			     struct v4l2_fwnode_device_properties *props)
>  {
> -	struct v4l2_fwnode_device_properties props;
> -	int ret;
> -
> -	ret = v4l2_fwnode_device_parse(ADEV_DEV(adev), &props);
> -	if (!ret || props.rotation == V4L2_FWNODE_PROPERTY_UNSET) {
> +	if (props->orientation == V4L2_FWNODE_PROPERTY_UNSET) {
>  		dev_warn(ADEV_DEV(adev), "Using default orientation\n");
>  		return V4L2_FWNODE_ORIENTATION_EXTERNAL;
>  	}
>  
> -	return props.orientation;
> +	return props->orientation;
>  }
>  
>  int ipu_bridge_parse_ssdb(struct acpi_device *adev, struct ipu_sensor *sensor)
>  {
> +	struct v4l2_fwnode_device_properties props;
>  	struct ipu_sensor_ssdb ssdb = {};
>  	int ret;
>  
> @@ -274,6 +278,10 @@ int ipu_bridge_parse_ssdb(struct acpi_device *adev, struct ipu_sensor *sensor)
>  	if (ret)
>  		return ret;
>  
> +	ret = v4l2_fwnode_device_parse(ADEV_DEV(adev), &props);
> +	if (ret)
> +		return ret;
> +
>  	if (ssdb.vcmtype > ARRAY_SIZE(ipu_vcm_types)) {
>  		dev_warn(ADEV_DEV(adev), "Unknown VCM type %d\n", ssdb.vcmtype);
>  		ssdb.vcmtype = 0;
> @@ -287,8 +295,8 @@ int ipu_bridge_parse_ssdb(struct acpi_device *adev, struct ipu_sensor *sensor)
>  	sensor->link = ssdb.link;
>  	sensor->lanes = ssdb.lanes;
>  	sensor->mclkspeed = ssdb.mclkspeed;
> -	sensor->rotation = ipu_bridge_parse_rotation(adev, &ssdb);
> -	sensor->orientation = ipu_bridge_parse_orientation(adev);
> +	sensor->rotation = ipu_bridge_parse_rotation(adev, &ssdb, &props);
> +	sensor->orientation = ipu_bridge_parse_orientation(adev, &props);
>  
>  	if (ssdb.vcmtype)
>  		sensor->vcm_type = ipu_vcm_types[ssdb.vcmtype - 1];
> 

-- 
Regards,

Sakari Ailus