From mboxrd@z Thu Jan 1 00:00:00 1970 From: stern@rowland.harvard.edu (Alan Stern) Date: Wed, 7 Sep 2016 12:08:20 -0400 (EDT) Subject: [PATCH] usb: dwc3: host: inherit dma configuration from parent dev In-Reply-To: <3189648.KnWLgq0lTY@wuerfel> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Wed, 7 Sep 2016, Arnd Bergmann wrote: > However, to summarize the discussion so far, I agree that > of_dma_configure() is not the solution to these problems, and I think > we can do much better: > > Splitting the usb_bus->controller field into the Linux-internal device > (used for the sysfs hierarchy, for printks and for power management) > and a new pointer (used for DMA, DT enumeration and phy lookup) probably > covers all that we really need. > > I've prototyped it below, with the dwc3, xhci and chipidea changes > together with the core changes. I've surely made mistakes there and > don't expect it to work out of the box, but this should give an > idea of how I think this can all be solved in the least invasive > way. > > I noticed that the gadget interface already has a way to handle the > DMA allocation by device, so I added that in as well. > > Signed-off-by: Arnd Bergmann > > drivers/usb/chipidea/core.c | 4 ---- > drivers/usb/chipidea/host.c | 3 ++- > drivers/usb/chipidea/udc.c | 8 ++++---- > drivers/usb/core/buffer.c | 12 ++++++------ > drivers/usb/core/hcd.c | 48 +++++++++++++++++++++++++++++------------------- > drivers/usb/core/usb.c | 16 ++++++++-------- > drivers/usb/dwc3/core.c | 28 +++++++++++++++------------- > drivers/usb/dwc3/core.h | 1 + > drivers/usb/dwc3/dwc3-exynos.c | 10 ---------- > drivers/usb/dwc3/dwc3-st.c | 1 - > drivers/usb/dwc3/ep0.c | 8 ++++---- > drivers/usb/dwc3/gadget.c | 34 +++++++++++++++++----------------- > drivers/usb/dwc3/host.c | 13 ++++--------- > drivers/usb/host/ehci-fsl.c | 4 ++-- How did this driver end up in the patch? > drivers/usb/host/xhci-plat.c | 32 +++++++++++++++++++++++++------- > include/linux/usb.h | 1 + > include/linux/usb/hcd.h | 3 +++ > diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c > index 9f5ffb629973..b2419950221f 100644 > --- a/drivers/usb/host/ehci-fsl.c > +++ b/drivers/usb/host/ehci-fsl.c > @@ -96,8 +96,8 @@ static int fsl_ehci_drv_probe(struct platform_device *pdev) > } > irq = res->start; > > - hcd = usb_create_hcd(&fsl_ehci_hc_driver, &pdev->dev, > - dev_name(&pdev->dev)); > + hcd = __usb_create_hcd(&fsl_ehci_hc_driver, &pdev->dev.parent, > + &pdev->dev, dev_name(&pdev->dev), NULL); Based on the if (of_device_is_compatible(dev->parent->of_node, "fsl,mpc5121-usb2-dr")) { lines in the driver? > if (!hcd) { > retval = -ENOMEM; > goto err1; Alan Stern