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Many monitor supports two or more interfaces, such as HDMI and VGA. They may also have two EDIDs: one for analog display and the other for digital display. However, the analog one may not include the information about bpc and color format. For example, the HP P24v G4 Monitor has two EDIDs: Analog: 00 ff ff ff ff ff ff 00 22 0e ab 36 01 01 01 01 13 20 01 03 68 35 1e 78 2a ce 65 a6 57 51 9f 27 0f 50 54 a1 08 00 d1 c0 a9 c0 81 c0 b3 00 95 00 81 00 81 80 01 01 02 3a 80 18 71 38 2d 40 58 2c 45 00 0f 28 21 00 00 1e 00 00 00 fd 00 32 3c 1e 50 11 00 0a 20 20 20 20 20 20 00 00 00 fc 00 48 50 20 50 32 34 76 20 47 34 0a 20 20 00 00 00 ff 00 31 43 52 32 31 39 30 4e 4d 43 0a 20 20 00 58 Digital: 00 ff ff ff ff ff ff 00 48 f4 52 12 01 01 01 01 02 1e 01 04 81 66 39 78 e6 c1 b0 a3 54 4c 99 26 0f 50 54 bd ef 80 d1 c0 81 c0 95 00 90 40 a9 c0 71 40 81 80 81 40 64 19 00 40 41 00 26 30 18 88 36 00 a0 5a 00 00 00 1e 0e 1f 00 80 51 00 1e 30 30 80 1b 01 a0 5a 00 00 00 1e 9e 20 00 90 51 20 1f 30 40 80 1c 01 a0 5a 00 00 00 1e 66 21 56 aa 51 00 1e 30 30 8f 1b 01 a0 5a 00 00 00 1e 00 cc For the display route: eDP -> TR5521 -> VGA, the color format and bpc information can not be parsed from the analog EDID. To adapt to this case, we set the default bpc to 8 and the default color format to DRM_COLOR_FORMAT_RGB444. Change-Id: I376a373e543fee7698b7619a4d26f020bd3ad707 Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.