Bug#908438: [PATCH resend] ARM: dts: sun7i: Disable OOB IRQ for brcm wifi on Cubietruck and Banana Pro

[Helmut Grohne <helmut@subdivi.de>]

Control: tags -1 + patch

Hi,

On Sun, Sep 30, 2018 at 04:58:52PM +0200, Hans de Goede wrote:
> While doing some brcmfmac driver work I needed to test this also on some
> devicetree based boards. So I fired up the good old Cubietruck and when
> that would not work a Banana Pro.
> 
> With an unmodified 4.17 kernel both boards intermittently would come up
> with non working wifi with the following errors:
> 
>  brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout
>  brcmfmac: brcmf_bus_started: failed: -110
>  brcmfmac: brcmf_attach: dongle is not responding: err=-110
>  brcmfmac: brcmf_sdio_firmware_callback: brcmf_attach failed

I confirm the observation on a Banana Pro booting the buster 4.19
kernel. The problem happend reliably for me. I also confirm that your
workaround solves the symptoms on my board.

> Using an OOB IRQ instead of the sdio-IRQ mechanism is mostly important to
> allow the MMC controller to go into runtime-suspend which is not really an
> issue on these boards since they are (usually) not battery powered.

I agree that this is a reasonable trade-off (power saving vs working
device).

Helmut