Kory Maincent
ace64fca8c
Update the entire documentation to reflect the recent improvements in buildroot-external-st. Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
2.4 KiB
Testing display support
Applicable platforms: STM32MP157-DK1, STM32MP157-DK2, STM32MP135-DK
The different platforms have the following capabilities:
- STM32MP157-DK1: HDMI output
- STM32MP157-DK2: DSI display panel and HDMI output
- STM32MP135-DK: DSI display panel
The demo configurations for all platforms include the modetest
utility, which allows low-level testing of display devices, directly
by using DRM devices.
First you can run modetest -c to enumerate the connectors available
on your system. On the STM32MP157-DK2, the output looks like this:
# modetest -c
...
Connectors:
id encoder status name size (mm) modes encoders
32 0 connected HDMI-A-1 480x270 5 31
modes:
index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot
#0 1280x720 60.00 1280 1390 1430 1650 720 725 730 750 74250 flags: phsync, pvsync; type: driver
#1 1280x720 50.00 1280 1720 1760 1980 720 725 730 750 74250 flags: phsync, pvsync; type: driver
#2 800x600 75.00 800 816 896 1056 600 601 604 625 49500 flags: phsync, pvsync; type: driver
#3 720x576 50.00 720 732 796 864 576 581 586 625 27000 flags: nhsync, nvsync; type: driver
#4 720x480 59.94 720 736 798 858 480 489 495 525 27000 flags: nhsync, nvsync; type: driver
...
34 0 connected DSI-1 52x86 1 33
modes:
index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot
#0 480x800 50.00 480 578 610 708 800 815 825 839 29700 flags: ; type: preferred, driver
So we can see that we have two connectors: connector 32 is the HDMI
output, while connector 34 is the DSI panel. Obviously, the results
on other platforms will be different.
STM32MP157-DK1
You can test the HDMI output by displaying modetest default picture,
for example in a 720p resolution:
# modetest -s 32:1280x720
STM32MP157-DK2
You can test the HDMI output by displaying modetest default picture,
for example in a 720p resolution:
# modetest -s 32:1280x720
You can test the DSI display panel by displaying the modetest
default picture, in the native DSI panel resolution:
# modetest -s 34:480x800
STM32MP135-DK
You can test the DSI display panel by first enabling the display backlight:
echo 1 > /sys/class/backlight/panel-backlight/brightness
And then displaying the modetest default picture, in the native DSI
panel resolution:
# modetest -s 32:480x272