REGRESSION: usb: dwc2: gadget: Add scatter-gather mode

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Hi,

SB CV MSC tests failed starting from Test Case 6 with BNA interrupt on 
ep1in. It's first BULK IN transaction after GET MAXLUN.

[319523.955339] dwc2 dwc2.1.auto: dwc2_hsotg_irq: 04088028 00080000 
(d88c3cc4) retry 8
[319523.955357] dwc2 dwc2.1.auto: dwc2_hsotg_irq: daint=00020000
[319523.955366] dwc2 dwc2.1.auto: dwc2_hsotg_epint: ep1(out) 
DxEPINT=0x00000001
[319523.955372] dwc2 dwc2.1.auto: dwc2_hsotg_epint: XferCompl: 
DxEPCTL=0x00098200, DXEPTSIZ=15c7d486
[319523.955377] dwc2 dwc2.1.auto: complete: ep 00000000b58e703a ep1out, 
req 00000000bde78704, 0 => 000000002620ceb8
[319523.955396] dwc2 dwc2.1.auto: ep1in: req 00000000acdadb34: 
36@00000000450496f9, noi=0, zero=0, snok=0
[319523.955403] dwc2 dwc2.1.auto: dwc2_hsotg_start_req: 
DxEPCTL=0x004a8200, ep 1, dir in
[319523.955406] dwc2 dwc2.1.auto: ureq->length:36 ureq->actual:0
[319523.955408] dwc2 dwc2.1.auto: dwc2_hsotg_start_req: 1@36/36, 
0x20080024 => 0x00000930
[319523.955410] dwc2 dwc2.1.auto: dwc2_hsotg_start_req: 36cbc000 pad => 
0x00000934
[319523.955412] dwc2 dwc2.1.auto: ep0 state:0
[319523.955413] dwc2 dwc2.1.auto: dwc2_hsotg_start_req: DxEPCTL=0x844a8200
[319523.955420] dwc2 dwc2.1.auto: dwc2_hsotg_start_req: DXEPCTL=0x80488200
[319523.955425] dwc2 dwc2.1.auto: ep1in: req 00000000f74873bc: 
13@000000007a860fd2, noi=0, zero=0, snok=0
[319523.955446] dwc2 dwc2.1.auto: dwc2_hsotg_irq: 04048028 00040000 
(d88c3cc4) retry 8
[319523.955451] dwc2 dwc2.1.auto: dwc2_hsotg_irq: daint=00000002
[319523.955460] dwc2 dwc2.1.auto: dwc2_hsotg_epint: ep1(in) 
DxEPINT=0x00000200
[319523.955462] dwc2 dwc2.1.auto: dwc2_hsotg_epint: BNA interrupt
[319553.987219] dwc2 dwc2.1.auto: dwc2_hsotg_irq: 04008428 00000400 
(d88c3cc4) retry 8

Meantime it's passing smoke test with mass storage function connected to 
Linux host.

Thanks,
Minas





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