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Subject: docs: uapi: media: Document Mediatek 10bit tiled formats
Author: Nicolas Dufresne <nicolas.dufre...@collabora.com>
Date: Thu Sep 14 11:06:51 2023 -0400
Document V4L2_PIX_FMT_MT2110T and V4L2_PIX_FMT_MT2110R. These two
formats are nearly identical, reusing MM21 format and expending it
by inserting chunk of 16 bytes of lower 2 bit pixel data after each
chunk of 64 bytes higher 8 bit of data.
Signed-off-by: Nicolas Dufresne <nicolas.dufre...@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
.../userspace-api/media/v4l/pixfmt-reserved.rst | 13 ---
.../userspace-api/media/v4l/pixfmt-yuv-planar.rst | 129 +++++++++++++++++++++
2 files changed, 129 insertions(+), 13 deletions(-)
---
diff --git a/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
b/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
index 886ba7b08d6b..ac52485252d9 100644
--- a/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
+++ b/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
@@ -275,19 +275,6 @@ please make a proposal on the linux-media mailing list.
Decoder's implementation can be found here,
`aspeed_codec <https://github.com/AspeedTech-BMC/aspeed_codec/>`__
- * .. _V4L2-PIX-FMT-MT2110T:
-
- - ``V4L2_PIX_FMT_MT2110T``
- - 'MT2110T'
- - This format is two-planar 10-Bit tile mode and having similitude with
- ``V4L2_PIX_FMT_MM21`` in term of alignment and tiling. Used for VP9,
AV1
- and HEVC.
- * .. _V4L2-PIX-FMT-MT2110R:
-
- - ``V4L2_PIX_FMT_MT2110R``
- - 'MT2110R'
- - This format is two-planar 10-Bit raster mode and having similitude with
- ``V4L2_PIX_FMT_MM21`` in term of alignment and tiling. Used for AVC.
* .. _V4L2-PIX-FMT-HEXTILE:
- ``V4L2_PIX_FMT_HEXTILE``
diff --git a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
index 1d43532095c0..b788f6933855 100644
--- a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
+++ b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
@@ -144,6 +144,20 @@ All components are stored with the same number of bits per
component.
- Cb, Cr
- Yes
- 4x4 tiles
+ * - V4L2_PIX_FMT_MT2110T
+ - 'MT2T'
+ - 15
+ - 4:2:0
+ - Cb, Cr
+ - No
+ - 16x32 / 16x16 tiles tiled low bits
+ * - V4L2_PIX_FMT_MT2110R
+ - 'MT2R'
+ - 15
+ - 4:2:0
+ - Cb, Cr
+ - No
+ - 16x32 / 16x16 tiles raster low bits
* - V4L2_PIX_FMT_NV16
- 'NV16'
- 8
@@ -369,6 +383,8 @@ two non-contiguous planes.
.. _V4L2-PIX-FMT-NV15-4L4:
.. _V4L2-PIX-FMT-NV12M-10BE-8L128:
.. _V4L2-PIX-FMT-NV12-10BE-8L128:
+.. _V4L2-PIX-FMT-MT2110T:
+.. _V4L2-PIX-FMT-MT2110R:
Tiled NV15
----------
@@ -396,6 +412,119 @@ byte 4: Y3(bits 7-0)
``V4L2_PIX_FMT_NV12_10BE_8L128`` is similar to
``V4L2_PIX_FMT_NV12M_10BE_8L128`` but stores
two planes in one memory.
+``V4L2_PIX_FMT_MT2110T`` is one of Mediatek packed 10bit YUV 4:2:0 formats.
+It is fully packed 10bit 4:2:0 format like NV15 (15 bits per pixel), except
+that the lower two bits data is stored in separate partitions. The format is
+composed of 16x32 luma tiles, and 16x16 chroma tiles. Each tiles is 640 bytes
+long, divided into 8 partitions of 80 bytes. The first 16 bytes of the
+partition represent the 2 least significant bits of pixel data. The remaining
+64 bytes represent the 8 most significant bits of pixel data.
+
+.. kernel-figure:: mt2110t.svg
+ :alt: mt2110t.svg
+ :align: center
+
+ Layout of MT2110T Chroma Tile
+
+Filtering out the upper part of each partitions results in a valid
+``V4L2_PIX_FMT_MM21`` frame. A partition is a sub-tile of size 16 x 4. The
+lower two bits is said to be tiled since each bytes contains the lower two
+bits of the column of for pixel matching the same index. The chroma tiles
+only have 4 partitions.
+
+.. flat-table:: MT2110T LSB bits layout
+ :header-rows: 1
+ :stub-columns: 1
+
+ * -
+ - start + 0:
+ - start + 1:
+ - . . .
+ - start\ +\ 15:
+ * - Bits 1:0
+ - Y'\ :sub:`0:0`
+ - Y'\ :sub:`0:1`
+ - . . .
+ - Y'\ :sub:`0:15`
+ * - Bit 3:2
+ - Y'\ :sub:`1:0`
+ - Y'\ :sub:`1:1`
+ - . . .
+ - Y'\ :sub:`1:15`
+ * - Bits 5:4
+ - Y'\ :sub:`2:0`
+ - Y'\ :sub:`2:1`
+ - . . .
+ - Y'\ :sub:`2:15`
+ * - Bits 7:6
+ - Y'\ :sub:`3:0`
+ - Y'\ :sub:`3:1`
+ - . . .
+ - Y'\ :sub:`3:15`
+
+``V4L2_PIX_FMT_MT2110R`` is identical to ``V4L2_PIX_FMT_MT2110T`` except that
+the least significant two bits layout is in raster order. This means the first
byte
+contains 4 pixels of the first row, with 4 bytes per line.
+
+.. flat-table:: MT2110R LSB bits layout
+ :header-rows: 2
+ :stub-columns: 1
+
+ * -
+ - :cspan:`3` Byte 0
+ - ...
+ - :cspan:`3` Byte 3
+ * -
+ - 7:6
+ - 5:4
+ - 3:2
+ - 1:0
+ - ...
+ - 7:6
+ - 5:4
+ - 3:2
+ - 1:0
+ * - start + 0:
+ - Y'\ :sub:`0:3`
+ - Y'\ :sub:`0:2`
+ - Y'\ :sub:`0:1`
+ - Y'\ :sub:`0:0`
+ - ...
+ - Y'\ :sub:`0:15`
+ - Y'\ :sub:`0:14`
+ - Y'\ :sub:`0:13`
+ - Y'\ :sub:`0:12`
+ * - start + 4:
+ - Y'\ :sub:`1:3`
+ - Y'\ :sub:`1:2`
+ - Y'\ :sub:`1:1`
+ - Y'\ :sub:`1:0`
+ - ...
+ - Y'\ :sub:`1:15`
+ - Y'\ :sub:`1:14`
+ - Y'\ :sub:`1:13`
+ - Y'\ :sub:`1:12`
+ * - start + 8:
+ - Y'\ :sub:`2:3`
+ - Y'\ :sub:`2:2`
+ - Y'\ :sub:`2:1`
+ - Y'\ :sub:`2:0`
+ - ...
+ - Y'\ :sub:`2:15`
+ - Y'\ :sub:`2:14`
+ - Y'\ :sub:`2:13`
+ - Y'\ :sub:`2:12`
+ * - start\ +\ 12:
+ - Y'\ :sub:`3:3`
+ - Y'\ :sub:`3:2`
+ - Y'\ :sub:`3:1`
+ - Y'\ :sub:`3:0`
+ - ...
+ - Y'\ :sub:`3:15`
+ - Y'\ :sub:`3:14`
+ - Y'\ :sub:`3:13`
+ - Y'\ :sub:`3:12`
+
.. _V4L2-PIX-FMT-NV16:
.. _V4L2-PIX-FMT-NV61:
