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Received: from AS4PR04MB9244.eurprd04.prod.outlook.com (2603:10a6:20b:4e3::9) by AM9PR04MB8842.eurprd04.prod.outlook.com (2603:10a6:20b:409::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8422.11; Sun, 9 Feb 2025 17:48:31 +0000 Received: from AS4PR04MB9244.eurprd04.prod.outlook.com ([fe80::7303:2cc8:d109:d7c1]) by AS4PR04MB9244.eurprd04.prod.outlook.com ([fe80::7303:2cc8:d109:d7c1%3]) with mapi id 15.20.8422.012; Sun, 9 Feb 2025 17:48:31 +0000 Message-ID: Date: Sun, 9 Feb 2025 19:48:27 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [EXT] [RFC v5 11/15] media: Documentation: Document luma-only mbus codes and CFA for cameras To: Sakari Ailus , linux-media@vger.kernel.org Cc: hverkuil@xs4all.nl, laurent.pinchart@ideasonboard.com, Prabhakar , Kate Hsuan , Alexander Shiyan , Mikhail Rudenko , Dave Stevenson , Tommaso Merciai , Umang Jain , Benjamin Mugnier , Sylvain Petinot , Christophe JAILLET , Julien Massot , Naushir Patuck , "Yan, Dongcheng" , "Cao, Bingbu" , "Qiu, Tian Shu" , "Wang, Hongju" , Stefan Klug , =?UTF-8?Q?Andr=C3=A9_Apitzsch?= , Heimir Thor Sverrisson , Kieran Bingham , Stanislaw Gruszka , Mehdi Djait , Ricardo Ribalda Delgado , Hans de Goede References: <20250203085853.1361401-1-sakari.ailus@linux.intel.com> <20250203085853.1361401-12-sakari.ailus@linux.intel.com> Content-Language: en-US From: Mirela Rabulea In-Reply-To: <20250203085853.1361401-12-sakari.ailus@linux.intel.com> Content-Type: text/plain; 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Please take care when clicking links or opening attachments. When in doubt, report the message using the 'Report this email' button > > > Document the use of luma-only mbus codes for camera sensors and how the > V4L2_CID_COLOUR_PATTERN and V4L2_CID_COLOUR_PATTERN_FLIP controls are used > to convey the colour filter array pattern on UAPI. > > Signed-off-by: Sakari Ailus > --- > .../userspace-api/media/drivers/camera-sensor.rst | 13 +++++++++++++ > .../media/v4l/ext-ctrls-image-source.rst | 4 ++++ > 2 files changed, 17 insertions(+) > > diff --git a/Documentation/userspace-api/media/drivers/camera-sensor.rst b/Documentation/userspace-api/media/drivers/camera-sensor.rst > index 5bc4c79d230c..91e5305458b9 100644 > --- a/Documentation/userspace-api/media/drivers/camera-sensor.rst > +++ b/Documentation/userspace-api/media/drivers/camera-sensor.rst > @@ -41,6 +41,19 @@ format set on a source pad at the end of the device's internal pipeline. > > Most sensor drivers are implemented this way. > > +V4L2_CID_COLOUR_PATTERN, luma-only mbus formats, flipping and cropping > +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > + > +For raw image data originating from camera sensors, :ref:`luma-only mbus codes > +MEDIA_BUS_FMT_Yx_1Xx (where 'x' is the bit depth) ` > +are used as Colour Filter Array (CFA) agnostic raw formats. The > +``V4L2_CID_COLOUR_PATTERN `` control in the > +same sub-device defines the native colour pattern of the device. Flipping may > +further affect the readout pattern as indicated by the > +``V4L2_CID_COLOUR_PATTERN_FLIP `` > +control. Further on, cropping also has an effect on the pattern if cropped > +amount is not divisible by the size of the pattern, horizontally and vertically. > + Ok, so it is clear now, the V4L2_CID_COLOUR_PATTERN stands for the "native colour pattern", as opposed to the "readout pattern". It is good to make the distinction. Maybe the V4L2_CID_COLOUR_PATTERN control description in patch #7 could also be made more clear with regards to native vs readout pattern? "This control determines the colour components and pixel order in the sensor's CFA (Colour Filter Array)..." => "This control reports the colour components and native pixel order in the sensor's CFA (Colour Filter Array)..." ? Thanks, Mirela > Frame interval configuration > ---------------------------- > > diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-image-source.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-image-source.rst > index ecfa38c118e3..4b98a740236a 100644 > --- a/Documentation/userspace-api/media/v4l/ext-ctrls-image-source.rst > +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-image-source.rst > @@ -93,6 +93,8 @@ Image Source Control IDs > is reported as being (say) 128, then a value of 192 would represent > a gain of exactly 1.5. > > +.. _image-source-control-colour-pattern: > + > ``V4L2_CID_COLOUR_PATTERN (integer)`` > This control determines the colour components and pixel order in the > sensor's CFA (Colour Filter Array) when used in conjunction with > @@ -103,6 +105,8 @@ Image Source Control IDs > > This is a read-only control. > > +.. _image-source-control-colour-pattern-flip: > + > ``V4L2_CID_COLOUR_PATTERN_FLIP (bitmask)`` > Whether the horizontal or vertical flipping controls (V4L2_CID_HFLIP and > V4L2_CID_VFLIP) have an effect on the pixel order of the output colour > -- > 2.39.5 >