Hi,
On 3/13/2018 1:31 AM, Felipe Balbi wrote:
>
> Hi,
>
> Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx> writes:
>> The maximum bytes per interval for USB SuperSpeed Plus can be set by
>> isoc endpoint companion descriptor when it is above 48K. If the
>> descriptor is provided, then use its value.
>>
>> USB 3.1 spec 9.6.8
>>
>> Signed-off-by: Thinh Nguyen <thinhn@xxxxxxxxxxxx>
>
> you should have Cc:ed Greg for this one. FWIW:
Will do next time.
>
> "This descriptor shall be returned for each Isochronous endpoint that
> requires more than 48K bytes per Service Interval."
>
> Acked-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
>
>> ---
>> drivers/usb/core/urb.c | 8 ++++++++
>> 1 file changed, 8 insertions(+)
>>
>> diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
>> index 9fdf137c4865..0ab4b896e3f3 100644
>> --- a/drivers/usb/core/urb.c
>> +++ b/drivers/usb/core/urb.c
>> @@ -433,6 +433,14 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
>> max *= mult;
>> }
>>
>> + if (dev->speed == USB_SPEED_SUPER_PLUS &&
>> + USB_SS_SSP_ISOC_COMP(ep->ss_ep_comp.bmAttributes)) {
>> + struct usb_ssp_isoc_ep_comp_descriptor *isoc_ep_comp;
>> +
>> + isoc_ep_comp = &ep->ssp_isoc_ep_comp;
>> + max = le32_to_cpu(isoc_ep_comp->dwBytesPerInterval);
>> + }
>> +
>> /* "high bandwidth" mode, 1-3 packets/uframe? */
>> if (dev->speed == USB_SPEED_HIGH)
>> max *= usb_endpoint_maxp_mult(&ep->desc);
>> --
>> 2.11.0
>>
>> --
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>
Thanks,
Thinh
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