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VA sample: device autodetection changed#19560

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opencv-pushbot merged 1 commit intoopencv:masterfrom
mshabunin:va-sample-fix
Feb 18, 2021
Merged

VA sample: device autodetection changed#19560
opencv-pushbot merged 1 commit intoopencv:masterfrom
mshabunin:va-sample-fix

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@mshabunin mshabunin commented Feb 18, 2021

The code worked with assumption that PCI devices sorted by name match DRI devices order, i.e. device with ID 0000:00:02 should be represented by card0/renderD128 and device 0000:01:00 by card1/renderD129. But in reality this is wrong:

$ ls -l /dev/dri/by-path/
lrwxrwxrwx. 1 root root  8 Feb 18 16:30 pci-0000:00:02.0-card -> ../card1
lrwxrwxrwx. 1 root root 13 Feb 18 16:30 pci-0000:00:02.0-render -> ../renderD129
lrwxrwxrwx. 1 root root  8 Feb 18 16:30 pci-0000:01:00.0-card -> ../card0
lrwxrwxrwx. 1 root root 13 Feb 18 16:30 pci-0000:01:00.0-render -> ../renderD128

Instead we probe drm endpoint as it seem to contain correct DRI device names:

$ ls  /sys/bus/pci/devices/0000\:01\:00.0/drm
card0  controlD64  renderD128
$ ls  /sys/bus/pci/devices/0000\:00\:02.0/drm
card1  controlD65  renderD129

@opencv-pushbot opencv-pushbot merged commit 504ff97 into opencv:master Feb 18, 2021
@mshabunin mshabunin deleted the va-sample-fix branch February 19, 2021 09:00
@alalek alalek mentioned this pull request Apr 9, 2021
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