Running Modetest to Test Your DRM Display Driver Once you finish the DRM(Direct Rendering Manager)

Running Modetest to Test Your DRM Display Driver

Once you finish the DRM(Direct Rendering Manager) driver, you will need to run the modetest to test your driver. modetest is a user-land test program of libdrm. Now it can run on linux and android platform.

Get Modetest

Since modetest is within libdrm, so you can get it by clone a copy of libdrm:

$ git clone git://anongit.freedesktop.org/mesa/drm

Build on Android

Put libdrm code to “external/ ” directory of Android source code tree. For example, for hikey board , run bellow commad to build.

sourcebuild/envsetup.sh lunch hikey-eng
cdexternal/drm/tests/modetest mma

After finish building, modetest will be installed at directory: out/target/product/hikey/system/bin. Then your can tar a system.img which including modetest.

$ make systemimage

Build on Linux

On your target boad, for example, a debain/ubuntu linux, install bellow required tools and then build.

cddrm apt-get install autoconf automake libtool pkg-config libpthread-stubs0-dev
./autogen.sh make

You’ll get modetest at “drm/tests/modetest” directory.

Run Modetest

Bellow commands list the DRM info including modes, where option “-M” specific the name of your DRM driver. e.g. for hikey board:

modetest -M hisi #list all the info of crtc, encoder and connector

modetest -M hisi -c #list all the info of connector including modes

./modetest -M hisi -c

Connectors:
id encoder status type size (mm) modes encoders
8 0 connected HDMI-A 470x300 1 7
modes:
name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot)
720p60 60 1280 1390 1430 1650 720 725 730 750 flags: phsync, pvsync; type: preferred, driver
props:
1 EDID:
flags: immutable blob
blobs:

            value:
                    00ffffffffffff0030ae0c0a01010101
                    23180103802f1e78ee23c5a5574f9e26
                    0f5054bdcf00714f8180818c9500950f
                    a9c0b300010121399030621a274068b0
                    3600da281100001c000000fd00324b1e
                    5311000a202020202020000000fc004c
                    543232353220576964650a20000000ff
                    0045333530303532310a202020200099
    2 DPMS:
            flags: enum
            enums: On=0 Standby=1 Suspend=2 Off=3
            value: 0

Test the modes by name with the “-s” option, you’ll see a color bar image display on your monitor if the driver is OK.

./modetest -M hisi -s 8:720p60 # where “8” is the connector id and “720p60” is the name of mode.

Note: Runing modetest on linux require not to run the X windows server.