On 11/27/23 8:28 AM, Phil Elwell wrote:
On Mon, 27 Nov 2023 at 12:39, Stefan Wahren <wahrenst@xxxxxxx> wrote:Hi Phil,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#L119What's the question here? Does the XHCI block present in the raspberrypi/linux dtsi file really exist? Yes it does.since i don't have any documentation about the xHCI block, i assumed the compatible generic-xhci is correct. But Justin seems to suggest that the xHCI block needs some special treatment and we need a specific compatible. Did i missed some xHCI driver changes? Does the VC firmware something to the xHCI especially on CM4?The firmware switches the on-board USB pins from DWC-OTG to XHCI if otg_mode=1 is set in config.txt, or if booting over USB MSD.is this pinctrl/pinmux available from ARM via 0x7e200000 or a different IO address?It's in a different, undocumented block. Phil
Well if it works, then maybe I am misunderstanding something here. Maybe its time for me to pick up a CM4 board.
Justin
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