linux-kernel - Re: [PATCH v7 5/5] usb: dwc3: core: cleanup IRQ resources

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Message-ID: <5731B395.4010201@ti.com>
Date:	Tue, 10 May 2016 13:10:29 +0300
From:	Roger Quadros <rogerq@...com>
To:	Felipe Balbi <balbi@...nel.org>
CC:	<tony@...mide.com>, <Joao.Pinto@...opsys.com>,
	<sergei.shtylyov@...entembedded.com>, <peter.chen@...escale.com>,
	<jun.li@...escale.com>, <grygorii.strashko@...com>,
	<yoshihiro.shimoda.uh@...esas.com>, <nsekhar@...com>,
	<b-liu@...com>, <linux-usb@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 5/5] usb: dwc3: core: cleanup IRQ resources

On 10/05/16 13:03, Felipe Balbi wrote:
> 
> Hi,
> 
> Roger Quadros <rogerq@...com> writes:
>> 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
>>
>> 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).
> 
> cool :-)
> 
>> @@ -748,6 +750,20 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
>>  		}
>>  		break;
>>  	case USB_DR_MODE_OTG:
>> +		dwc->otg_irq = platform_get_irq_byname(dwc3_pdev, "otg");
>> +		if (dwc->otg_irq <= 0) {
>> +			dwc->otg_irq = platform_get_irq_byname(dwc3_pdev,
>> +							       "dwc_usb3");
>> +			if (dwc->otg_irq <= 0) {
>> +				res = platform_get_resource(dwc3_pdev,
>> +							    IORESOURCE_IRQ, 0);
>> +				if (!res) {
>> +					dev_err(dwc->dev, "missing otg IRQ\n");
>> +					return -ENODEV;
>> +				}
>> +				dwc->otg_irq = res->start;
>> +			}
>> +		}
> 
> I suppose this part can be removed and added only when OTG is
> supported. Then dwc3_otg_init() (or whatever) can do this.

Sure.
> 
>> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
>> index 186a886..2e20892 100644
>> --- a/drivers/usb/dwc3/core.h
>> +++ b/drivers/usb/dwc3/core.h
>> @@ -716,6 +716,8 @@ struct dwc3_scratchpad_array {
>>   * @maximum_speed: maximum speed requested (mainly for testing purposes)
>>   * @revision: revision register contents
>>   * @dr_mode: requested mode of operation
>> + * @gadget_irq: IRQ number for Peripheral IRQs
>> + * @otg_irq: IRQ number for OTG IRQs
>>   * @usb2_phy: pointer to USB2 PHY
>>   * @usb3_phy: pointer to USB3 PHY
>>   * @usb2_generic_phy: pointer to USB2 PHY
>> @@ -817,6 +819,9 @@ struct dwc3 {
>>  
>>  	enum usb_dr_mode	dr_mode;
>>  
>> +	int			gadget_irq;
>> +	int			otg_irq;
> 
> while at that, let's add host_irq too and do proper changes to dwc3/host.c

Sure. So we add host_irq here, and manually create an irq resource
in dwc3_host_init?
> 
>> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
>> index c3b0d01..8db8d13 100644
>> --- a/drivers/usb/dwc3/gadget.c
>> +++ b/drivers/usb/dwc3/gadget.c
>> @@ -1605,7 +1605,7 @@ static int dwc3_gadget_start(struct usb_gadget *g,
>>  	int			irq;
>>  	u32			reg;
>>  
>> -	irq = platform_get_irq(to_platform_device(dwc->dev), 0);
>> +	irq = dwc->gadget_irq;
>>  	ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
>>  			IRQF_SHARED, "dwc3", dwc->ev_buf);
>>  	if (ret) {
>> @@ -2781,6 +2781,23 @@ 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->gadget_irq = platform_get_irq_byname(dwc3_pdev, "peripheral");
>> +	if (dwc->gadget_irq <= 0) {
>> +		dwc->gadget_irq = platform_get_irq_byname(dwc3_pdev,
>> +							  "dwc_usb3");
>> +		if (dwc->gadget_irq <= 0) {
>> +			res = platform_get_resource(dwc3_pdev, IORESOURCE_IRQ,
>> +						    0);
>> +			if (!res) {
>> +				dev_err(dwc->dev, "missing peripheral IRQ\n");
>> +				return -ENODEV;
>> +			}
>> +			dwc->gadget_irq = res->start;
>> +		}
>> +	}
>>  
>>  	dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
>>  			&dwc->ctrl_req_addr, GFP_KERNEL);
> 
> you're regressing dwc3_gadget_stop().
> 
ah, good catch.

cheers,
-roger