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Tue, 28 Apr 2026 22:09:07 +0200 (CEST) Message-ID: <7e7bccd3553444c0ebda80685f46a366e8bf49ad.camel@collabora.com> Subject: Re: [PATCH v6 2/6] docs: uapi: media: Document Raspberry Pi NV12 column format From: Nicolas Dufresne To: Dave Stevenson , Sakari Ailus , Laurent Pinchart , Mauro Carvalho Chehab , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Florian Fainelli , Broadcom internal kernel review list , John Cox , Dom Cobley , review list , Ezequiel Garcia Cc: John Cox , Stefan Wahren , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org Date: Tue, 28 Apr 2026 16:09:06 -0400 In-Reply-To: <20260304-media-rpi-hevc-dec-v6-2-93868ae6dff8@raspberrypi.com> References: <20260304-media-rpi-hevc-dec-v6-0-93868ae6dff8@raspberrypi.com> <20260304-media-rpi-hevc-dec-v6-2-93868ae6dff8@raspberrypi.com> Autocrypt: addr=nicolas.dufresne@collabora.com; prefer-encrypt=mutual; keydata=mDMEaCN2ixYJKwYBBAHaRw8BAQdAM0EHepTful3JOIzcPv6ekHOenE1u0vDG1gdHFrChD /e0J05pY29sYXMgRHVmcmVzbmUgPG5pY29sYXNAbmR1ZnJlc25lLmNhPoicBBMWCgBEAhsDBQsJCA cCAiICBhUKCQgLAgQWAgMBAh4HAheABQkJZfd1FiEE7w1SgRXEw8IaBG8S2UGUUSlgcvQFAmibrjo CGQEACgkQ2UGUUSlgcvQlQwD/RjpU1SZYcKG6pnfnQ8ivgtTkGDRUJ8gP3fK7+XUjRNIA/iXfhXMN abIWxO2oCXKf3TdD7aQ4070KO6zSxIcxgNQFtDFOaWNvbGFzIER1ZnJlc25lIDxuaWNvbGFzLmR1Z nJlc25lQGNvbGxhYm9yYS5jb20+iJkEExYKAEECGwMFCwkIBwICIgIGFQoJCAsCBBYCAwECHgcCF4 AWIQTvDVKBFcTDwhoEbxLZQZRRKWBy9AUCaCyyxgUJCWX3dQAKCRDZQZRRKWBy9ARJAP96pFmLffZ smBUpkyVBfFAf+zq6BJt769R0al3kHvUKdgD9G7KAHuioxD2v6SX7idpIazjzx8b8rfzwTWyOQWHC AAS0LU5pY29sYXMgRHVmcmVzbmUgPG5pY29sYXMuZHVmcmVzbmVAZ21haWwuY29tPoiZBBMWCgBBF iEE7w1SgRXEw8IaBG8S2UGUUSlgcvQFAmibrGYCGwMFCQll93UFCwkIBwICIgIGFQoJCAsCBBYCAw ECHgcCF4AACgkQ2UGUUSlgcvRObgD/YnQjfi4+L8f4fI7p1pPMTwRTcaRdy6aqkKEmKsCArzQBAK8 bRLv9QjuqsE6oQZra/RB4widZPvphs78H0P6NmpIJ Organization: Collabora Canada Content-Type: multipart/signed; micalg="pgp-sha512"; protocol="application/pgp-signature"; boundary="=-7Ch6iLaTw0XauR+6FJtM" User-Agent: Evolution 3.58.3 (3.58.3-1.fc43) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260428_130913_677662_33F6514D X-CRM114-Status: GOOD ( 14.56 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --=-7Ch6iLaTw0XauR+6FJtM Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Le mercredi 04 mars 2026 =C3=A0 14:05 +0000, Dave Stevenson a =C3=A9crit=C2= =A0: > The Raspberry Pi HEVC decoder uses a tiled format based on > columns for 8 and 10 bit YUV images, so document them as > NV12MT_COL128 and NV12MT_10_COL128. >=20 > Signed-off-by: Dave Stevenson Reviewed-by: Nicolas Dufresne > --- > =C2=A0.../userspace-api/media/v4l/pixfmt-yuv-planar.rst=C2=A0 | 46 ++++++= ++++++++++++++++ > =C2=A01 file changed, 46 insertions(+) >=20 > diff --git a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst = b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst > index 0631919bd667..1aa4182b8adc 100644 > --- a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst > +++ b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst > @@ -957,6 +957,52 @@ Data in the 12 high bits, zeros in the 4 low bits, a= rranged in little endian ord > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 - Cr\ :sub:`11` > =C2=A0 > =C2=A0 > +.. _V4L2-PIX-FMT-NV12MT-COL128: > +.. _V4L2-PIX-FMT-NV12MT-10-COL128: > + > +NV12MT_COL128 and NV12MT_10_COL128 > +---------------------------------- > + > +``V4L2_PIX_FMT_NV12MT_COL128`` is a tiled version of > +``V4L2_PIX_FMT_NV12M`` where the two planes are split into 128 byte wide= columns > +of Y or interleaved CbCr. The height is always aligned to a multiple of = 8 lines. > + > +V4L2_PIX_FMT_NV12MT_10_COL128 expands that as a 10 bit format where 3 10= bit > +values are packed into a 32bit word. A 128 byte wide column therefore ho= lds 96 > +samples (either Y or interleaved CrCb). That effectively makes it 6 valu= es in a > +64 bit word for the CbCr plane, as the values always go in pairs. > + > +Bit-packed representation. > + > +.. tabularcolumns:: |p{1.2cm}||p{1.2cm}||p{1.2cm}||p{1.2cm}|p{3.2cm}|p{3= .2cm}| > + > +.. flat-table:: > +=C2=A0=C2=A0=C2=A0 :header-rows:=C2=A0 0 > +=C2=A0=C2=A0=C2=A0 :stub-columns: 0 > +=C2=A0=C2=A0=C2=A0 :widths: 8 8 8 8 > + > +=C2=A0=C2=A0=C2=A0 * - Y'\ :sub:`00[7:0]` > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 - Y'\ :sub:`01[5:0] (bits 7--2)` Y'\ :sub= :`00[9:8]`\ (bits 1--0) > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 - Y'\ :sub:`02[3:0] (bits 7--4)` Y'\ :sub= :`01[9:6]`\ (bits 3--0) > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 - unused (bits 7--6)` Y'\ :sub:`02[9:4]`\= (bits 5--0) > + > +.. tabularcolumns:: |p{1.2cm}||p{1.2cm}||p{1.2cm}||p{1.2cm}|p{3.2cm}|p{3= .2cm}| > + > +.. flat-table:: > +=C2=A0=C2=A0=C2=A0 :header-rows:=C2=A0 0 > +=C2=A0=C2=A0=C2=A0 :stub-columns: 0 > +=C2=A0=C2=A0=C2=A0 :widths: 12 12 12 12 12 12 12 12 > + > +=C2=A0=C2=A0=C2=A0 * - Cb\ :sub:`00[7:0]` > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 - Cr\ :sub:`00[5:0]`\ (bits 7--2) Cb\ :su= b:`00[9:8]`\ (bits 1--0) > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 - Cb\ :sub:`01[3:0]`\ (bits 7--4) Cr\ :su= b:`00[9:6]`\ (bits 3--0) > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 - unused (bits 7--6) Cb\ :sub:`02[9:4]`\ = (bits 5--0) > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 - Cr\ :sub:`01[7:0]` > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 - Cb\ :sub:`02[5:0]`\ (bits 7--2) Cr\ :su= b:`01[9:8]`\ (bits 1--0) > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 - Cr\ :sub:`02[3:0]`\ (bits 7--4) Cb\ :su= b:`02[9:6]`\ (bits 3--0) > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 - unused (bits 7--6) Cr\ :sub:`02[9:4]`\ = (bits 5--0) > + > + > =C2=A0Fully Planar YUV Formats > =C2=A0=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D > =C2=A0 --=-7Ch6iLaTw0XauR+6FJtM Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQTvDVKBFcTDwhoEbxLZQZRRKWBy9AUCafET4wAKCRDZQZRRKWBy 9Df7AQDdDm+K0RDoDm4EmYyFb7f/DZl/G7cMSaGO8VxO/5JluAEAvBactothia6u XLthlVZdgV7+TAHdpocsHpuQSmts+Qo= =F9Cy -----END PGP SIGNATURE----- --=-7Ch6iLaTw0XauR+6FJtM--