Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754275AbcDALBj (ORCPT ); Fri, 1 Apr 2016 07:01:39 -0400 Received: from devils.ext.ti.com ([198.47.26.153]:59623 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751720AbcDALBg (ORCPT ); Fri, 1 Apr 2016 07:01:36 -0400 Subject: Re: [PATCH v3 2/2] usb:dwc3: pass arch data to xhci-hcd child To: Felipe Balbi , "Thang Q. Nguyen" References: <1457594332-7490-1-git-send-email-tqnguyen@apm.com> <1457594332-7490-3-git-send-email-tqnguyen@apm.com> <87mvpgi02f.fsf@intel.com> <56FBDA0D.4030507@ti.com> <87egashxz8.fsf@intel.com> <87k2kjgjjf.fsf@intel.com> <56FD3D2F.8070501@ti.com> <871t6pahg8.fsf@intel.com> <56FE4378.3030205@ti.com> <87shz58wbw.fsf@intel.com> CC: Greg Kroah-Hartman , , , , , Arnd Bergmann , "Karicheri, Muralidharan" , Peter Ujfalusi , Phong Vo , Loc Ho , patches , Santosh Shilimkar , "Ben Dooks (embedded platforms)" From: Grygorii Strashko Message-ID: <56FE54DB.5000201@ti.com> Date: Fri, 1 Apr 2016 14:00:43 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 MIME-Version: 1.0 In-Reply-To: <87shz58wbw.fsf@intel.com> Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3358 Lines: 83 On 04/01/2016 01:20 PM, Felipe Balbi wrote: > > Hi, > > Grygorii Strashko writes: >>> if of_dma_configure() does what you want, why don't you just stick it in >>> dwc3-keystone.c and let the driver continue to copy things for now ? >>> Something like below, perhaps ? >>> >> >> I know (and i have patch to fix that which I'm going to send) that DMA config >> in dwc3-keystone.c is not correct and we are good till now just >> because dwc3_keystone is not used for DMA operations directly. >> >> Now about xhci and friends: >> dwc3_keystone *is created* from DT : of_platform_device_create() -> of_platform_device_create_pdata() -> of_dma_configure() >> |- dwc3 *is created* from DT : of_platform_device_create() -> of_platform_device_create_pdata() -> of_dma_configure() >> |- [1] *creates* xhci dev manually : DMA configuration copied manually in dwc3_host_init() >> |- [2] *creates* usb_gadget dev manually: DMA configuration copied manually in usb_add_gadget_udc_release() >> |- *creates* usb_udc dev manually : not used for DMA operations directly (as I've checked) >> >> Now cases [1] & [2] introduces failures, because DMA configuration is not complete for >> these devices. > > right, then we just copy whatever's missing, right ? Until there's a > generic way of copying these bits, I want to avoid introducing any of_* > specific methodologies and prefer to have the manual copy. Sry, I've found no other way (right now) to fix it, except by using of_dma_configure() which will do all work in DT case (including calling of arch specific callbacks). [it might be unsafe to just copy archdata, for example, as it might(will for arm) contain pointers] > >> I can confirm that if I fix [1] & [2] as above USB Device/Dual modes will start >> working on K2E. Above is for 4.1 kernel > > cool, I'd be happy to take both patches ;-) > ok. And seems gadget case is fixed already commit 7ace8fc8219e4cbbfd5b4790390d9a01a2541cdf Author: Yoshihiro Shimoda Date: Mon Jul 13 18:10:05 2015 +0900 usb: gadget: udc: core: Fix argument of dma_map_single for IOMMU The dma_map_single and dma_unmap_single should set "gadget->dev.parent" instead of "&gadget->dev" in the first argument because the parent has a udc controller's device pointer. Otherwise, iommu functions are not called in ARM environment. Signed-off-by: Yoshihiro Shimoda Signed-off-by: Felipe Balbi Above actually means that DMA configuration code can be dropped from usb_add_gadget_udc_release() completely. Right?: diff --git a/drivers/usb/gadget/udc/udc-core.c b/drivers/usb/gadget/udc/udc-core.c index 4151597..e4e70e1 100644 --- a/drivers/usb/gadget/udc/udc-core.c +++ b/drivers/usb/gadget/udc/udc-core.c @@ -371,12 +371,6 @@ int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget, INIT_WORK(&gadget->work, usb_gadget_state_work); gadget->dev.parent = parent; -#ifdef CONFIG_HAS_DMA - dma_set_coherent_mask(&gadget->dev, parent->coherent_dma_mask); - gadget->dev.dma_parms = parent->dma_parms; - gadget->dev.dma_mask = parent->dma_mask; -#endif - if (release) gadget->dev.release = release; else -- regards, -grygorii