Need to set VC clock to 250 Mhz in the bcm2835-unicam driver
@naushir is already working on this.
Since Apr 29, 2020.
Assessment
This issue has not been assessed yet.
Description
Describe the bug
If the VC core clock drops below 250 MHz, Unicam may underrun and produce corrupt images. This is handled correctly in the FW driver, but not in the kernel driver.
To reproduce
Run a camera usecase that uses the kernel Unicam driver. However, this is very intermittent, and seems to be board dependent.
Expected behaviour
No corrupt images should be produced.
Actual behaviour
Corrupt images are produced.
- Which model of Raspberry Pi? e.g. Pi3B+, PiZeroW
Found happening on a small number of Pi4 boards.
Additional context
Current workaround is to add core_freq_min=250 in /boot/config.txt
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