[PATCH 0/5] Fixes and additions to EDID generation

[Gerd Hoffmann]

  Hi,

> > (And in the long run we should use or write a tool to generate EDIDs
> > instead of using assembly with macros. And like Jon already mentioned in
> > the other thread, even the assembly probably shouldn't be under
> > Documentation. But I digress.)
> 
> If we do that, maybe stuff the EDID things into Documentation/gpu? Would
> need an ack from media folks I think, but imo would make sense.

Oh, btw:  I've written a edid generator for qemu for the virtual display
devices, and I've also added a small test tool so you don't have to boot
a virtual machine to test the thing.  Will ship with the upcoming qemu
3.1 release.  You might find this useful ...

cheers,
  Gerd

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# qemu-edid -h

This is a test tool for the qemu edid generator.

Typically you'll pipe the output into edid-decode
to check if the generator works correctly.

usage: qemu-edid <options>
options:
    -h             print this text
    -o <file>      set output file (stdout by default)
    -v <vendor>    set monitor vendor (three letters)
    -n <name>      set monitor name
    -s <serial>    set monitor serial
    -d <dpi>       set display resolution
    -x <prefx>     set preferred width
    -y <prefy>     set preferred height
    -X <maxx>      set maximum width
    -Y <maxy>      set maximum height

# qemu-edid | edid-decode 
Extracted contents:
header:          00 ff ff ff ff ff ff 00
serial number:   49 14 34 12 00 00 00 00 2a 18
version:         01 04
basic params:    a5 28 1e 78 06
chroma info:     ee 91 a3 54 4c 99 26 0f 50 54
established:     21 08 00
standard:        e1 c0 d1 c0 01 01 01 01 01 01 01 01 01 01 01 01
descriptor 1:    25 20 00 66 41 00 1a 30 00 1e 33 40 93 2e 11 00 00 18
descriptor 2:    00 00 00 fd 00 32 7d 1e a0 78 01 0a 20 20 20 20 20 20
descriptor 3:    00 00 00 fc 00 51 45 4d 55 20 4d 6f 6e 69 74 6f 72 0a
descriptor 4:    00 00 00 f7 00 0a 00 4a a2 24 29 20 00 00 00 00 00 00
extensions:      01
checksum:        19

Manufacturer: RHT Model 1234 Serial Number 0
Made week 42 of 2014
EDID version: 1.4
Digital display
8 bits per primary color channel
DisplayPort interface
Maximum image size: 40 cm x 30 cm
Gamma: 2.20
Supported color formats: RGB 4:4:4
Default (sRGB) color space is primary color space
First detailed timing is preferred timing
Established timings supported:
  640x480 at 60Hz
  800x600 at 60Hz
  1024x768 at 60Hz
Standard timings supported:
  2048x1152 at 60Hz
  1920x1080 at 60Hz
Detailed mode: Clock 82.290 MHz, 403 mm x 302 mm
               1024 1280 1310 1382 hborder 0
                768  771  774  794 vborder 0
               -hsync -vsync 
Monitor ranges (bare limits): 50-125Hz V, 30-160kHz H, max dotclock 1200MHz
Monitor name: QEMU Monitor
Established timings III
Has 1 extension blocks
Checksum: 0x19 (valid)

CEA extension block
Extension version: 3
6 bytes of CEA data
  Video data block
    VIC 125 Unknown mode 
    VIC 101 4096x2160 at 50Hz 
    VIC  96 3840x2160 at 50Hz 
    VIC  89 2560x1080 at 50Hz 
    VIC  31 1920x1080 at 50Hz 
0 native detailed modes
Checksum: 0xf2 (valid)