Re: [PATCH v2 3/4] PCI: brcmstb: Wait for Raspberry Pi's firmware when present

From: Nicolas Saenz Julienne
Date: Thu Feb 20 2020 - 13:14:27 EST

On Wed, 2020-02-19 at 11:21 -0800, Florian Fainelli wrote:
> On 2/19/20 4:39 AM, Nicolas Saenz Julienne wrote:
> > xHCI's PCI fixup, run at the end of pcie-brcmstb's probe, depends on
> > RPi4's VideoCore firmware interface to be up and running. It's possible
> > for both initializations to race, so make sure it's available prior
> > starting.
> >
> > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@xxxxxxx>
> Reviewed-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
> It does not look like there is something making sure that
> CONFIG_RASPBERRYPI_FIRMWARE is being selected or depended on, should we
> have a "default XHCI_PCI" added to drivers/firmware/Kconfig?

I think having that would enable the firmware interface for all XHCI_PCI users,
which isn't ideal. The firmware call has stubs for the case the firmware
interace isn't compiled, so no problem there. Ultimately we want to enable
CONFIG_RASPBERRYPI_FIRMWARE only when the built image targets the RPi4
(reglardless of being arm64/arm32). But I don't think that's feasible.


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