[PATCH 2/2] usb: xhci: Load Raspberry Pi 4 VL805's firmware

Bin Meng bmeng.cn at gmail.com
Wed Apr 29 08:51:59 CEST 2020

Hi Nicolas,

On Wed, Apr 29, 2020 at 1:45 AM Nicolas Saenz Julienne
<nsaenzjulienne at suse.de> wrote:
> When needed, RPi4's co-processor (called VideoCore) has to be instructed
> to load VL805's firmware (the chip providing xHCI support). VideCore's
> firmware expects the board's PCIe bus to be already configured in order
> for it to load the xHCI chip firmware. So we have to make sure this
> happens in between the PCIe configuration and xHCI startup.

I am a little bit confused. I thought we already solved the xHCI
driver issuw on RPi4. What's this firmware used for?

> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne at suse.de>
> ---
>  drivers/usb/host/xhci-pci.c | 6 ++++++
>  1 file changed, 6 insertions(+)


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