Re: [PATCH v9 5/5] usb: dwc3: core: cleanup IRQ resources

Roger Quadros
2016-06-10T08:04:42Z

On 10/06/16 11:02, Roger Quadros wrote:
> Grygorii,
>
> On 02/06/16 14:52, Grygorii Strashko wrote:
>> On 06/01/2016 10:46 AM, Roger Quadros wrote:
>>> Implementations might use different IRQs for
>>> host, gadget and OTG so use named interrupt resources
>>> to allow Device tree to specify the 3 interrupts.
>>>
>>> Following are the interrupt names
>>>
>>> Peripheral Interrupt - peripheral
>>> HOST Interrupt - host
>>> OTG Interrupt - otg
>>
>> or "dwc_usb3"??
>>
>>>
>>> We still maintain backward compatibility for a single named
>>> interrupt for all 3 interrupts (e.g. for dwc3-pci) and
>>> single unnamed interrupt for all 3 interrupts (e.g. old DT).
>>
>> bindings
>>
>>>
>>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>>> ---
>>> v9: rebased on top of balbi/testing/next
>>>
>>> drivers/usb/dwc3/core.c | 10 ----------
>>> drivers/usb/dwc3/gadget.c | 20 ++++++++++++++++++--
>>> drivers/usb/dwc3/host.c | 19 +++++++++++++++++++
>>> 3 files changed, 37 insertions(+), 12 deletions(-)
>>>
>>> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
>>> index 9c4e1d8d..5cedf3d 100644
>>> --- a/drivers/usb/dwc3/core.c
>>> +++ b/drivers/usb/dwc3/core.c
>>> @@ -843,16 +843,6 @@ static int dwc3_probe(struct platform_device *pdev)
>>> dwc->mem = mem;
>>> dwc->dev = dev;
>>>
>>> - res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
>>> - if (!res) {
>>> - dev_err(dev, "missing IRQ\n");
>>> - return -ENODEV;
>>> - }
>>> - dwc->xhci_resources[1].start = res->start;
>>> - dwc->xhci_resources[1].end = res->end;
>>> - dwc->xhci_resources[1].flags = res->flags;
>>> - dwc->xhci_resources[1].name = res->name;
>>> -
>>> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>> if (!res) {
>>> dev_err(dev, "missing memory resource\n");
>>> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
>>> index c37168d..c18c72f 100644
>>> --- a/drivers/usb/dwc3/gadget.c
>>> +++ b/drivers/usb/dwc3/gadget.c
>>> @@ -1726,7 +1726,7 @@ static int dwc3_gadget_start(struct usb_gadget *g,
>>> int ret = 0;
>>> int irq;
>>>
>>> - irq = platform_get_irq(to_platform_device(dwc->dev), 0);
>>> + irq = dwc->irq_gadget;
>>> ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
>>> IRQF_SHARED, "dwc3", dwc->ev_buf);
>>> if (ret) {
>>> @@ -1734,7 +1734,6 @@ static int dwc3_gadget_start(struct usb_gadget *g,
>>> irq, ret);
>>> goto err0;
>>> }
>>> - dwc->irq_gadget = irq;
>>>
>>> spin_lock_irqsave(&dwc->lock, flags);
>>> if (dwc->gadget_driver) {
>>> @@ -2853,6 +2852,23 @@ static irqreturn_t dwc3_interrupt(int irq, void *_evt)
>>> int dwc3_gadget_init(struct dwc3 *dwc)
>>> {
>>> int ret;
>>> + struct resource *res;
>>> + struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
>>> +
>>> + dwc->irq_gadget = platform_get_irq_byname(dwc3_pdev, "peripheral");
>>> + if (dwc->irq_gadget <= 0) {
>>
>> Is it expected to get -EPROBE_DEFER here?
>>
>>> + dwc->irq_gadget = platform_get_irq_byname(dwc3_pdev,
>>> + "dwc_usb3");
>>> + if (dwc->irq_gadget <= 0) {
>>> + res = platform_get_resource(dwc3_pdev, IORESOURCE_IRQ,
>>> + 0);
>>
>> It's better to use platform_get_irq().
>>
>>> + if (!res) {
>>> + dev_err(dwc->dev, "missing peripheral IRQ\n");
>>> + return -ENODEV;
>>> + }
>>> + dwc->irq_gadget = res->start;
>>> + }
>>> + }
>>>
>>> dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
>>> &dwc->ctrl_req_addr, GFP_KERNEL);
>>> diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
>>> index c679f63..f2b60a4 100644
>>> --- a/drivers/usb/dwc3/host.c
>>> +++ b/drivers/usb/dwc3/host.c
>>> @@ -25,6 +25,25 @@ int dwc3_host_init(struct dwc3 *dwc)
>>> struct platform_device *xhci;
>>> struct usb_xhci_pdata pdata;
>>> int ret;
>>> + struct resource *res;
>>> + struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
>>> +
>>> + res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ, "host");
>>> + if (!res) {
>>> + res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ,
>>> + "dwc_usb3");
>>> + if (!res) {
>>> + res = platform_get_resource(dwc3_pdev, IORESOURCE_IRQ,
>>> + 0);
>>> + if (!res)
>>
>>> + return -ENOMEM;
>>> + }
>>> + }
>>
>> Is it expected to have more than one IRQ here?
>>
>> if not - it will better to use platform_get_irq[_byname]().
>>
>
> The reason I used platform_get_resource variant is that i'm passing the
> resource directly to the XHCI platform device below.
>>
>>> +
>>> + dwc->xhci_resources[1].start = res->start;
>>> + dwc->xhci_resources[1].end = res->end;
>>> + dwc->xhci_resources[1].flags = res->flags;
>>> + dwc->xhci_resources[1].name = res->name;
>
> This could just change to
>
> dwc->xhci_resource[1] = *res;

Probably not as we don't want to change parent/child members.

>
>>>
>>> xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
>>> if (!xhci) {
>>>
>>
>>
>

--
cheers,
-roger