On Mon, 27 Nov 2023 at 11:08, Stefan Wahren <wahrenst@xxxxxxx> wrote: > > Hi Justin, > > [add Phil] > > Am 27.11.23 um 07:02 schrieb Justin Chen: > > > > > > On 11/25/23 6:56 PM, Stefan Wahren wrote: > >> In contrast to the Raspberry Pi 4, the Compute Module 4 or the IO board > >> does not have a VL805 USB 3.0 host controller, which is connected via > >> PCIe. Instead, the BCM2711 on the Compute Module provides the built-in > >> xHCI. > >> > > > > Does this work? I maintain this built-in xHCI controller internally. I > > wasn't aware the Compute Module uses this block. > i successful tested this with a CM4 (arm 32 bit, > multi_v7_lpae_defconfig) with eMMC. Before this series the USB devices > (mouse, keyboard) connected to the host interface didn't work. After > comparing vendor DTS with mainline i noticed the missing xHCI block [1]. > Unfortunately i wasn't able to get further information from the public > datasheets. I don't know if the VideoCore does some magic tricks on the > xHCI or i missed some downstream xHCI changes. > > > This block is held in reset and needs a bit toggled to get things > > going. Florian, just to confirm, this is our "brcm,xhci-brcm-v2" block > > correct? > > > > Justin > > [1] - > https://github.com/raspberrypi/linux/blob/rpi-6.1.y/arch/arm/boot/dts/bcm2711-rpi-ds.dtsi#L119 What's the question here? Does the XHCI block present in the raspberrypi/linux dtsi file really exist? Yes it does. Phil
