[U-Boot] [[PATCH v2 5/6] USB: ehci: Add a weak function for resetting devices

[Dan Murphy]

On 07/10/2013 05:20 PM, Marek Vasut wrote:
> Dear Dan Murphy,
>
>> Add a __weak function that can be overridden to reset devices
>> attached to an ehci devices after the FEAT_POWER has been submitted
>>
>> Signed-off-by: Dan Murphy <dmurphy at ti.com>
>> ---
>>  drivers/usb/host/ehci-hcd.c |    7 +++++++
>>  1 file changed, 7 insertions(+)
>>
>> diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
>> index 706cf0c..fdd3994 100644
>> --- a/drivers/usb/host/ehci-hcd.c
>> +++ b/drivers/usb/host/ehci-hcd.c
>> @@ -616,6 +616,11 @@ __weak uint32_t *ehci_get_portsc_register(struct
>> ehci_hcor *hcor, int port) return (uint32_t *)&hcor->or_portsc[port];
>>  }
>>
>> +__weak void ehci_reset_attached_devices(int port)
>> +{
>> +	return;
>> +}
>> +
> Can the reset not happen elsewhere?
I have tried to move this around and keep this out of this file completely but nothing else seems to work.

For port 2 where the USB3530 is we don't have the issue the 3530 enumerates properly.

I did not see any information in the data sheet eluding to a timing issue.
>
>>  int
>>  ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
>>  		 int length, struct devrequest *req)
>> @@ -777,6 +782,7 @@ ehci_submit_root(struct usb_device *dev, unsigned long
>> pipe, void *buffer, reg |= EHCI_PS_PP;
>>  				ehci_writel(status_reg, reg);
>>  			}
>> +			ehci_reset_attached_devices(port);
>>  			break;
>>  		case USB_PORT_FEAT_RESET:
>>  			if ((reg & (EHCI_PS_PE | EHCI_PS_CS)) == EHCI_PS_CS &&
>> @@ -794,6 +800,7 @@ ehci_submit_root(struct usb_device *dev, unsigned long
>> pipe, void *buffer, reg |= EHCI_PS_PR;
>>  				reg &= ~EHCI_PS_PE;
>>  				ehci_writel(status_reg, reg);
>> +
> NAK
DOH!
>
>>  				/*
>>  				 * caller must wait, then call GetPortStatus
>>  				 * usb 2.0 specification say 50 ms resets on
> Best regards,
> Marek Vasut


-- 
------------------
Dan Murphy