From: Greg KH <gregkh@linuxfoundation.org>
To: Mathias Nyman <mathias.nyman@linux.intel.com>
Cc: Roger Quadros <rogerq@ti.com>,
Alan Stern <stern@rowland.harvard.edu>,
Sriram Dash <sriram.dash@nxp.com>,
linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
mathias.nyman@intel.com, suresh.gupta@nxp.com,
felipe.balbi@linux.intel.com, pku.leo@gmail.com,
Arnd Bergmann <arnd@arndb.de>
Subject: Re: [PATCH v5 4/6] usb: xhci: use bus->sysdev for DMA configuration
Date: Thu, 19 Jan 2017 10:22:40 +0100 [thread overview]
Message-ID: <20170119092240.GA6456@kroah.com> (raw)
In-Reply-To: <587F5864.201@linux.intel.com>
On Wed, Jan 18, 2017 at 01:58:28PM +0200, Mathias Nyman wrote:
> On 12.01.2017 10:38, Roger Quadros wrote:
> > Mathias,
> >
> > On 11/01/17 17:08, Alan Stern wrote:
> > > On Wed, 11 Jan 2017, Mathias Nyman wrote:
> > >
> > > > On 17.11.2016 13:43, Sriram Dash wrote:
> > > > > From: Arnd Bergmann <arnd@arndb.de>
> > > > >
> > > > > 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 <arnd@arndb.de>
> > > > > Signed-off-by: Sriram Dash <sriram.dash@nxp.com>
> > > > > Tested-by: Baolin Wang <baolin.wang@linaro.org>
> > > > > ---
> > > >
> > > > ...
> > > >
> > > > > + /*
> > > > > + * sysdev must point to a device that is known to the system firmware
> > > > > + * or PCI hardware. We handle these three cases here:
> > > > > + * 1. xhci_plat comes from firmware
> > > > > + * 2. xhci_plat is child of a device from firmware (dwc3-plat)
> > > > > + * 3. xhci_plat is grandchild of a pci device (dwc3-pci)
> > > > > + */
> > > > > + sysdev = &pdev->dev;
> > > > > + if (sysdev->parent && !sysdev->of_node && sysdev->parent->of_node)
> > > > > + sysdev = sysdev->parent;
> > > > > +#ifdef CONFIG_PCI
> > > > > + else if (sysdev->parent && sysdev->parent->parent &&
> > > > > + sysdev->parent->parent->bus == &pci_bus_type)
> > > > > + sysdev = sysdev->parent->parent;
> > > > > +#endif
> > > > > +
> > > >
> > > > Not maybe the the ideal situation here, and looks really tailored to make PCI dwc3
> > > > controllers with xhci support work.
> > > >
> > > > Was there some reason child devices can't automatically inherit the dma mask from the parents,
> > > > forcing us to dig it from grandparents?
> > > >
> > > > Anyway, looks like the dwc3 part is already in 4.10-rc,
> > > > If Greg and Alan want to take this series that's fine by me
> > >
> > > I have no objections.
> > >
> > > Alan Stern
> > >
> > > > I haven't tested that it won't break anything on PCI XHCI controllers though
> > > >
> > > > -Mathias
> >
> > Are you going to pick all the remaining patches from this series (i.e. 1 to 4)?
> >
> > That should fix the warning that people are seeing on v4.10-rc.
> >
>
> Let's check with Greg
>
> Greg, 5/6 and 6/6 are in 4.10-rc already, causing additional warnings for
> people using dwc3 xhci.
>
> First 3 patches change usb core, patch 4 xhci.
>
> Compiles and boots, doesn't break pci xhci (non-dwc3) functionality
>
> Would you like me to send first 4 patches for usb-linus to get a clean final 4.10
> without warnings, or to send them for usb-next?
>
> Or will you just pick the patches from here directly.
I don't have them "here" anymore, they are long-gone from my patch
queue, sorry.
Can you resend them, I don't know what these patches contained, but if
they fix an 4.10 issue, that would be good to have there, right?
thanks,
greg k-h
next prev parent reply other threads:[~2017-01-19 9:28 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-17 11:43 [PATCH v5 0/6] inherit dma configuration from parent dev Sriram Dash
2016-11-17 11:43 ` [PATCH v5 1/6] usb: separate out sysdev pointer from usb_bus Sriram Dash
2016-12-03 0:19 ` Brian Norris
2017-01-06 19:33 ` Grygorii Strashko
2016-12-13 16:09 ` [v5,1/6] " Alexander Sverdlin
2016-11-17 11:43 ` [PATCH v5 2/6] usb: chipidea: use bus->sysdev for DMA configuration Sriram Dash
2016-11-17 11:43 ` [PATCH v5 3/6] usb: ehci: fsl: " Sriram Dash
2016-11-17 11:43 ` [PATCH v5 4/6] usb: xhci: " Sriram Dash
2016-12-09 11:56 ` Roger Quadros
2016-12-13 16:09 ` [v5,4/6] " Alexander Sverdlin
2017-01-11 14:21 ` [PATCH v5 4/6] " Mathias Nyman
2017-01-11 15:08 ` Alan Stern
2017-01-12 8:38 ` Roger Quadros
2017-01-18 11:58 ` Mathias Nyman
2017-01-19 9:22 ` Greg KH [this message]
2017-01-19 11:33 ` Mathias Nyman
2016-11-17 11:43 ` [PATCH v5 5/6] usb: dwc3: " Sriram Dash
2016-12-13 16:09 ` [v5,5/6] " Alexander Sverdlin
2016-11-17 11:43 ` [PATCH v5 6/6] usb: dwc3: Do not set dma coherent mask Sriram Dash
2016-12-13 16:09 ` [v5,6/6] " Alexander Sverdlin
2016-12-22 6:23 ` [PATCH v5 0/6] inherit dma configuration from parent dev Vivek Gautam
2017-01-05 15:21 ` Roger Quadros
2017-01-05 17:16 ` Greg KH
2017-01-10 12:11 ` Roger Quadros
2017-01-11 21:32 ` Javier Martinez Canillas
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