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

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Message-ID: <cab8c0d70fd30c49579199d002b81b87ed34a920.camel@suse.de>
Date:   Thu, 20 Feb 2020 19:14:20 +0100
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Florian Fainelli <florian.fainelli@...adcom.com>,
        linux-kernel@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Andrew Murray <amurray@...goodpenguin.co.uk>
Cc:     linux-usb@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, gregkh@...uxfoundation.org,
        tim.gover@...pberrypi.org, linux-pci@...r.kernel.org,
        wahrenst@....net, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v2 3/4] PCI: brcmstb: Wait for Raspberry Pi's firmware
 when present

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@...e.de>
> 
> Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
> 
> 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.

Regards,
Nicolas


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