Phil Elwell

That's a red herring the Zero 2 W doesn't use the BT_HOST_WAKE signal (it's not connected), and the DTS doesn't declare the interrupt source. The interrupts which are being detected...

Not directly, no. Like many SDIO/MMC drivers, bcm2835-mmc sets MMC_CAP_SDIO_IRQ regardless. It is likely that disabling interrupt usage would reduce the system load, but the question is whether it will...

Running iperf while running top and pressing '1' shows the CPU usage breakdown by cores. I think the top level %CPU figure is in terms of a single core, not...

You can't seriously compare a PCIe-attached PC-class WiFi controller with one on the end of a 4-bit-wide SDIO bus.

Do you want to try again with a better tone?

Yes - all Pis prior to the Pi 5 use a non-bus-mastering MMC interface to control the WiFi device over an 4-bit SDIO interface, clocked no faster than 50MHz (single...

> remove cap-sdio-irq in dts and fix cpu usage from 20% to 0.5% You cannot remove that which isn't there. This may do something useful on other platforms, but not...

I can't speak to whether this patch is the best solution to the problem, but I can believe that it might be.

That's what the w1_gpio driver attempts to do, by forcing the pin to be an output driven high for a while.

@gtrainavicius @j-schambacher This is a more open and more efficient place to discuss the required changes than individual issues or private emails.