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Mon, 27 Nov 2023 09:44:53 -0800 (PST) Message-ID: Date: Mon, 27 Nov 2023 09:44:51 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/3] ARM: dts: bcm2711-rpi-cm4-io: Enable xHCI host To: Phil Elwell , Stefan Wahren Cc: Greg Kroah-Hartman , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Florian Fainelli , Mathias Nyman , bcm-kernel-feedback-list@broadcom.com, Cyril Brulebois , linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20231126025612.12522-1-wahrenst@gmx.net> <53e1f6e6-a28e-45af-991e-75b283a21b34@broadcom.com> <46320840-09ab-4c86-90c9-bee7b75f248a@gmx.net> <624b79b1-f2dc-4f2e-a225-d1623d905b19@gmx.net> From: Justin Chen In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231127_094458_470065_4AB05803 X-CRM114-Status: GOOD ( 17.85 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============0320895072005264380==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============0320895072005264380== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="00000000000037edcc060b25dcab" --00000000000037edcc060b25dcab Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 11/27/23 8:28 AM, Phil Elwell wrote: > On Mon, 27 Nov 2023 at 12:39, Stefan Wahren 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#L119 >>>>> What'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. 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--00000000000037edcc060b25dcab-- --===============0320895072005264380== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============0320895072005264380==--