From: Felipe Balbi <balbi@kernel.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Peter Chen <hzpeterchen@gmail.com>, Leo Li <pku.leo@gmail.com>,
Grygorii Strashko <grygorii.strashko@ti.com>,
Russell King - ARM Linux <linux@arm.linux.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
"linux-usb\@vger.kernel.org" <linux-usb@vger.kernel.org>,
Sekhar Nori <nsekhar@ti.com>, lkml <linux-kernel@vger.kernel.org>,
Stuart Yoder <stuart.yoder@nxp.com>,
Scott Wood <oss@buserror.net>,
David Fisher <david.fisher1@synopsys.com>,
"Thang Q. Nguyen" <tqnguyen@apm.com>,
Alan Stern <stern@rowland.harvard.edu>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"linux-arm-kernel\@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH] usb: dwc3: host: inherit dma configuration from parent dev
Date: Thu, 08 Sep 2016 11:29:04 +0300 [thread overview]
Message-ID: <87y432iylr.fsf@linux.intel.com> (raw)
In-Reply-To: <6739240.VDAnDBppH0@wuerfel>
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Hi,
Arnd Bergmann <arnd@arndb.de> writes:
>> > @@ -178,7 +179,7 @@ static void dwc3_frame_length_adjustment(struct dwc3 *dwc)
>> > static void dwc3_free_one_event_buffer(struct dwc3 *dwc,
>> > struct dwc3_event_buffer *evt)
>> > {
>> > - dma_free_coherent(dwc->dev, evt->length, evt->buf, evt->dma);
>> > + dma_free_coherent(dwc->sysdev, evt->length, evt->buf, evt->dma);
>>
>> how about "dma_dev" instead? Is this used for anything other than DMA?
>
> The two other things we have discussed in this thread are:
>
> - connecting of_node pointers to usb_device structures for children
> of sysdev->of_node. Note that this can happen even for PCI devices
> in case you have a USB ethernet device hardwired to a PCI-USB bridge
> and put the mac address in DT.
>
> - finding the PHY device for a HCD
>
> There might be others. Basically sysdev here is what the USB core code
> can use for looking up any kind of properties provided by the firmware.
fair enough
>> > @@ -846,6 +847,13 @@ static int dwc3_probe(struct platform_device *pdev)
>> > dwc = PTR_ALIGN(mem, DWC3_ALIGN_MASK + 1);
>> > dwc->mem = mem;
>> > dwc->dev = dev;
>> > +#ifdef CONFIG_PCI
>> > + /* TODO: or some other way of detecting this? */
>> > + if (dwc->dev->parent && dwc->dev->parent->bus == &pci_bus_type)
>> > + dwc->sysdev = dwc->dev->parent;
>> > + else
>> > +#endif
>> > + dwc->sysdev = dwc->dev;
>>
>> Well, we can remove this ifdef and *always* use the parent. We will just
>> require that dwc3 users provide a glue layer. In that case, your check
>> becomes:
>>
>> if (dwc->dev->parent)
>> dwc->sysdev = dwc->dev->parent;
>> else
>> dev_info(dwc->dev, "Please provide a glue layer!\n");
>
> If we do that, we have to put child devices of the dwc3 devices into
> the platform glue, and it also breaks those dwc3 devices that don't
> have a parent driver.
Well, this is easy to fix:
if (dwc->dev->parent) {
dwc->sysdev = dwc->dev->parent;
} else {
dev_info(dwc->dev, "Please provide a glue layer!\n");
dwc->sysdev = dwc->dev;
}
>> > diff --git a/drivers/usb/dwc3/dwc3-st.c b/drivers/usb/dwc3/dwc3-st.c
>> > index 89a2f712fdfe..4d7439cb8cd8 100644
>> > --- a/drivers/usb/dwc3/dwc3-st.c
>> > +++ b/drivers/usb/dwc3/dwc3-st.c
>> > @@ -218,7 +218,6 @@ static int st_dwc3_probe(struct platform_device *pdev)
>> > if (IS_ERR(regmap))
>> > return PTR_ERR(regmap);
>> >
>> > - dma_set_coherent_mask(dev, dev->coherent_dma_mask);
>>
>> so is this.
>>
>> All in all, I like where you're going with this, we just need a matching
>> acpi_dma_configure() and problems will be sorted out.
>
> With this patch, I don't think we even need that any more, as the device
> that we use the dma-mapping API is the one that already gets configured
> correctly by the platform code for all cases: PCI, OF, ACPI and combinations
> of those.
sounds good to me
--
balbi
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next prev parent reply other threads:[~2016-09-08 8:32 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-25 19:21 [PATCH] usb: dwc3: host: inherit dma configuration from parent dev Grygorii Strashko
2016-04-26 6:17 ` Felipe Balbi
2016-04-26 8:14 ` Grygorii Strashko
2016-04-27 5:41 ` Felipe Balbi
2016-04-27 11:55 ` Grygorii Strashko
2016-04-27 13:59 ` Catalin Marinas
2016-04-27 14:11 ` Arnd Bergmann
2016-04-27 15:50 ` Catalin Marinas
2016-04-27 16:04 ` Arnd Bergmann
2016-04-27 16:53 ` Felipe Balbi
2016-04-27 17:42 ` Arnd Bergmann
2016-04-27 17:59 ` Alan Stern
2016-04-27 18:08 ` Arnd Bergmann
2016-04-27 20:05 ` Felipe Balbi
2016-04-27 21:05 ` Arnd Bergmann
2016-04-28 6:37 ` Felipe Balbi
2016-04-28 14:16 ` Russell King - ARM Linux
2016-04-28 14:23 ` Arnd Bergmann
2016-04-28 14:27 ` Felipe Balbi
2016-09-01 22:14 ` Leo Li
2016-09-02 10:43 ` Arnd Bergmann
2016-09-02 10:47 ` Russell King - ARM Linux
2016-09-02 11:08 ` Felipe Balbi
2016-09-02 14:11 ` Felipe Balbi
2016-09-02 14:21 ` Alan Stern
2016-09-02 15:51 ` Arnd Bergmann
2016-09-07 7:17 ` Roger Quadros
2016-09-07 8:29 ` Arnd Bergmann
2016-09-07 13:04 ` Roger Quadros
2016-09-07 14:38 ` Arnd Bergmann
2016-09-02 16:23 ` Grygorii Strashko
2016-09-02 10:53 ` Felipe Balbi
2016-09-02 11:55 ` Robin Murphy
2016-09-02 12:56 ` Felipe Balbi
2016-09-02 13:10 ` Arnd Bergmann
2016-09-02 22:16 ` Leo Li
2016-09-05 15:39 ` Arnd Bergmann
2016-09-06 6:35 ` Peter Chen
2016-09-06 6:40 ` Felipe Balbi
2016-09-06 10:46 ` Arnd Bergmann
2016-09-06 10:50 ` Felipe Balbi
2016-09-06 13:27 ` Arnd Bergmann
2016-09-07 6:51 ` Felipe Balbi
2016-09-07 7:44 ` Peter Chen
2016-09-07 8:52 ` Arnd Bergmann
2016-09-07 9:29 ` Peter Chen
2016-09-07 9:35 ` Russell King - ARM Linux
2016-09-07 10:18 ` Felipe Balbi
2016-09-06 10:38 ` Arnd Bergmann
2016-09-07 6:33 ` Peter Chen
2016-09-07 8:48 ` Arnd Bergmann
2016-09-07 9:55 ` Peter Chen
2016-09-07 10:33 ` Robin Murphy
2016-09-07 10:47 ` Felipe Balbi
2016-09-14 16:31 ` Lorenzo Pieralisi
2016-09-14 21:50 ` Arnd Bergmann
2016-09-07 10:24 ` Felipe Balbi
2016-09-07 15:24 ` Arnd Bergmann
2016-09-07 16:08 ` Alan Stern
2016-09-07 19:45 ` Arnd Bergmann
2016-09-08 1:15 ` Peter Chen
2016-09-08 8:02 ` Arnd Bergmann
2016-09-08 8:03 ` Felipe Balbi
2016-09-08 8:26 ` Arnd Bergmann
2016-09-08 8:29 ` Felipe Balbi [this message]
2016-09-08 8:45 ` Arnd Bergmann
2016-09-08 9:43 ` Felipe Balbi
2016-09-08 10:17 ` Arnd Bergmann
2016-09-08 11:00 ` Felipe Balbi
2016-09-08 11:11 ` Arnd Bergmann
2016-09-08 11:20 ` Felipe Balbi
2016-09-08 11:39 ` Arnd Bergmann
2016-09-08 11:52 ` Felipe Balbi
2016-09-08 12:46 ` Arnd Bergmann
2016-09-08 12:02 ` Grygorii Strashko
2016-09-08 12:14 ` Arnd Bergmann
2016-09-08 12:28 ` Peter Chen
2016-09-08 12:52 ` Arnd Bergmann
2016-09-09 1:37 ` Peter Chen
2016-09-08 12:59 ` Grygorii Strashko
2016-09-09 1:52 ` Peter Chen
2016-09-21 11:06 ` Sriram Dash
2016-09-21 11:31 ` Arnd Bergmann
2016-09-21 11:43 ` Sriram Dash
2016-09-21 12:48 ` Arnd Bergmann
2016-09-22 5:02 ` Sriram Dash
2016-10-07 22:46 ` Leo Li
2016-09-21 17:14 ` [PATCH] usb: xhci: Fix the patch inherit dma configuration from kbuild test robot
2016-04-27 20:57 ` [PATCH] usb: dwc3: host: inherit dma configuration from parent dev Felipe Balbi
2016-04-27 14:14 ` Grygorii Strashko
2016-05-05 17:07 ` Brian Norris
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