linux-kernel - Re: [PATCH] Documentation: media: *

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Message-ID: <20191024101959.GA3966@mara.localdomain>
Date:   Thu, 24 Oct 2019 13:19:59 +0300
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Ricardo Ribalda Delgado <ribalda@...nel.org>
Cc:     hverkuil-cisco@...all.nl, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Documentation: media: *_DEFAULT targets for subdevs

Hi Ricardo,

On Thu, Oct 24, 2019 at 10:40:14AM +0200, Ricardo Ribalda Delgado wrote:
> Some sensors have optical blanking areas, this is, pixels that are
> painted and do not account for light, only noise.
> 
> These special pixels are very useful for calibrating the sensor, but
> should not be displayed on a DEFAULT target.
> 
> Signed-off-by: Ricardo Ribalda Delgado <ribalda@...nel.org>
> ---
>  .../media/uapi/v4l/v4l2-selection-targets.rst | 24 ++++---------------
>  1 file changed, 5 insertions(+), 19 deletions(-)
> 
> diff --git a/Documentation/media/uapi/v4l/v4l2-selection-targets.rst b/Documentation/media/uapi/v4l/v4l2-selection-targets.rst
> index f74f239b0510..4b356f66525e 100644
> --- a/Documentation/media/uapi/v4l/v4l2-selection-targets.rst
> +++ b/Documentation/media/uapi/v4l/v4l2-selection-targets.rst
> @@ -19,7 +19,7 @@ of the two interfaces they are used.
>  
>  .. _v4l2-selection-targets-table:
>  
> -.. tabularcolumns:: |p{6.0cm}|p{1.4cm}|p{7.4cm}|p{1.2cm}|p{1.4cm}|
> +.. tabularcolumns:: |p{6.0cm}|p{1.4cm}|p{10.0cm}|
>  
>  .. flat-table:: Selection target definitions
>      :header-rows:  1
> @@ -28,49 +28,35 @@ of the two interfaces they are used.
>      * - Target name
>        - id
>        - Definition
> -      - Valid for V4L2
> -      - Valid for V4L2 subdev
>      * - ``V4L2_SEL_TGT_CROP``
>        - 0x0000
>        - Crop rectangle. Defines the cropped area.
> -      - Yes
> -      - Yes
>      * - ``V4L2_SEL_TGT_CROP_DEFAULT``
>        - 0x0001
>        - Suggested cropping rectangle that covers the "whole picture".
> -      - Yes
> -      - No
> +        This includes only active pixels and excludes other non-active
> +        pixels such as Optical Blanking.

s/Optical Blanking/black pixels/

>      * - ``V4L2_SEL_TGT_CROP_BOUNDS``
>        - 0x0002
>        - Bounds of the crop rectangle. All valid crop rectangles fit inside
>  	the crop bounds rectangle.
> -      - Yes
> -      - Yes
>      * - ``V4L2_SEL_TGT_NATIVE_SIZE``
>        - 0x0003
>        - The native size of the device, e.g. a sensor's pixel array.
>  	``left`` and ``top`` fields are zero for this target.
> -      - Yes
> -      - Yes
>      * - ``V4L2_SEL_TGT_COMPOSE``
>        - 0x0100
>        - Compose rectangle. Used to configure scaling and composition.
> -      - Yes
> -      - Yes
>      * - ``V4L2_SEL_TGT_COMPOSE_DEFAULT``
>        - 0x0101
>        - Suggested composition rectangle that covers the "whole picture".
> -      - Yes
> -      - No
> +        This includes only active pixels and excludes other non-active
> +        pixels such as Optical Blanking.

This isn't relevant for the compose default.

>      * - ``V4L2_SEL_TGT_COMPOSE_BOUNDS``
>        - 0x0102
>        - Bounds of the compose rectangle. All valid compose rectangles fit
>  	inside the compose bounds rectangle.
> -      - Yes
> -      - Yes
>      * - ``V4L2_SEL_TGT_COMPOSE_PADDED``
>        - 0x0103
>        - The active area and all padding pixels that are inserted or
>  	modified by hardware.
> -      - Yes
> -      - No

The padding refers to the dimensions of the memory buffer. I don't think the
intent is to support that on sub-devices, is it?

Please just change the CROP_DEFAULT, not the rest.

-- 
Regards,

Sakari Ailus
sakari.ailus@...ux.intel.com