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dianjixz
91 lines
2.7 KiB
Markdown
91 lines
2.7 KiB
Markdown
# Testing display support
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Applicable platforms: STM32MP157-DK1, STM32MP157-DK2, STM32MP135-DK
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The different platforms have the following capabilities:
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* STM32MP157-DK1: HDMI output
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* STM32MP157-DK2: DSI display panel and HDMI output
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* STM32MP135-DK: DSI display panel
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The *demo* configurations for all platforms include the `modetest`
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utility, which allows low-level testing of display devices, directly
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by using *DRM* devices.
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First you can run `modetest -c` to enumerate the connectors available
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on your system. On the STM32MP157-DK2, the output looks like this:
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```
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# modetest -c
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...
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trying to open device 'stm'...done
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Connectors:
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id encoder status name size (mm) modes encoders
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32 0 connected HDMI-A-1 480x270 5 31
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modes:
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index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot
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#0 1280x720 60.00 1280 1390 1430 1650 720 725 730 750 74250 flags: phsync, pvsync; type: driver
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#1 1280x720 50.00 1280 1720 1760 1980 720 725 730 750 74250 flags: phsync, pvsync; type: driver
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#2 800x600 75.00 800 816 896 1056 600 601 604 625 49500 flags: phsync, pvsync; type: driver
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#3 720x576 50.00 720 732 796 864 576 581 586 625 27000 flags: nhsync, nvsync; type: driver
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#4 720x480 59.94 720 736 798 858 480 489 495 525 27000 flags: nhsync, nvsync; type: driver
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...
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34 0 connected DSI-1 52x86 1 33
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modes:
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index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot
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#0 480x800 50.00 480 578 610 708 800 815 825 839 29700 flags: ; type: preferred, driver
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```
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So we can see that we have two connectors: connector `32` is the HDMI
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output, while connector `34` is the DSI panel. Obviously, the results
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on other platforms will be different.
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## STM32MP157-DK1
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You can test the HDMI output by displaying `modetest` default picture,
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for example in a 720p resolution:
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```
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# modetest -M stm -s 32:1280x720
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```
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## STM32MP157-DK2
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You can test the HDMI output by displaying `modetest` default picture,
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for example in a 720p resolution:
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```
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# modetest -M stm -s 32:1280x720
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```
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You can test the DSI display panel by displaying the `modetest`
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default picture, in the native DSI panel resolution:
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```
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# modetest -M stm -s 34:480x800
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```
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You can change the DSI display panel backlight value from 0 to
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`max_brightness`:
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```
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# cat /sys/class/backlight/5a000000.dsi.0/max_brightness
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255
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# echo 10 > /sys/class/backlight/5a000000.dsi.0/brightness
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```
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## STM32MP135-DK
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You can test the DSI display panel by first enabling the display
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backlight:
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```
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echo 1 > /sys/class/backlight/panel-backlight/brightness
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```
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And then displaying the `modetest` default picture, in the native DSI
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panel resolution:
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```
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# modetest -M stm -s 32:480x272
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```
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