From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jack Pham Subject: Re: [PATCH v12 6/9] usb: xhci: use bus->sysdev for DMA configuration Date: Wed, 8 Feb 2017 12:43:00 -0800 Message-ID: <20170208204300.GC8068@usblab-sd-06.qualcomm.com> References: <1486372421-29073-1-git-send-email-peter.chen@nxp.com> <1486372421-29073-7-git-send-email-peter.chen@nxp.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <1486372421-29073-7-git-send-email-peter.chen@nxp.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: Peter Chen Cc: mark.rutland@arm.com, ulf.hansson@linaro.org, heiko@sntech.de, stephen.boyd@linaro.org, linux-kernel@vger.kernel.org, gary.bisson@boundarydevices.com, Sriram Dash , festevam@gmail.com, stillcompiling@gmail.com, arnd@arndb.de, dbaryshkov@gmail.com, vaibhav.hiremath@linaro.org, krzk@kernel.org, mka@chromium.org, stern@rowland.harvard.edu, devicetree@vger.kernel.org, mail@maciej.szmigiero.name, pawel.moll@arm.com, linux-pm@vger.kernel.org, s.hauer@pengutronix.de, troy.kisky@boundarydevices.com, robh+dt@kernel.org, Mathias Nyman , linux-arm-kernel@lists.infradead.org, Roger Quadros , hverkuil@xs4all.nl, oscar@naiandei.net, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, rjw@rjwysocki.net, sre@kernel.org, broonie@kernel.org, p.zabel@pengutronix.de, shawnguo@kernel.org List-Id: devicetree@vger.kernel.org Hi Peter, Sriram, Arnd, On Mon, Feb 06, 2017 at 05:13:38PM +0800, Peter Chen wrote: > From: Arnd Bergmann > > For xhci-hcd platform device, all the DMA parameters are not > configured properly, notably dma ops for dwc3 devices. So, set > the dma for xhci from sysdev. sysdev is pointing to device that > is known to the system firmware or hardware. > > Signed-off-by: Arnd Bergmann > Signed-off-by: Sriram Dash > Tested-by: Baolin Wang > Tested-by: Vivek Gautam > Tested-by: Alexander Sverdlin > Signed-off-by: Mathias Nyman > --- > diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c > index 6d33b42..7a9c860 100644 > --- a/drivers/usb/host/xhci-plat.c > +++ b/drivers/usb/host/xhci-plat.c > - hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); > + hcd = __usb_create_hcd(driver, sysdev, &pdev->dev, > + dev_name(&pdev->dev), NULL); As mentioned already in [1], usb_create_shared_hcd() is called to create the second bus, however it also needs to be converted. Not exactly as Roger's suggestion but this worked for me: - xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev, + xhci->shared_hcd = __usb_create_hcd(driver, sysdev, &pdev->dev, dev_name(&pdev->dev), hcd); if (!xhci->shared_hcd) { ret = -ENOMEM; Without this, SuperSpeed devices fail to enumerate: usb 2-1: new SuperSpeed USB device number 2 using xhci-hcd usb 2-1: device descriptor read/8, error -11 usb 2-1: new SuperSpeed USB device number 2 using xhci-hcd usb 2-1: device descriptor read/8, error -11 usb 2-1: new SuperSpeed USB device number 3 using xhci-hcd usb 2-1: device descriptor read/8, error -11 usb 2-1: new SuperSpeed USB device number 3 using xhci-hcd usb 2-1: device descriptor read/8, error -11 Thanks, Jack [1] https://lkml.org/lkml/2016/12/9/240 -- The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project