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On 3/6/25 15:12, Junzhong Pan wrote: > Hi Piyush, > >> Issue: Adding a dTD to a Primed Endpoint May Not Get Recognized with >> revision 2.20a. >> >> There is an issue with the add dTD tripwire semaphore (ATDTW bit in >> USBCMD register) that can cause the controller to ignore a dTD that is >> added to a primed endpoint. When this happens, the software can read >> the tripwire bit and the status bit at '1' even though the endpoint is >> unprimed. >> This issue observed with the Windows host machine. > > Sorry to dig through this old patch email. > > May I ask what does **the scene look like (bus condition/dtd status)** > when this issue observed with the Windows host machine occurs? > > I want to know if it's relevant to an issue I encountered recently. > > I met this a tricky issue with an soc have a marvel udc (driven by > mv_udc_core.c, it's a same chipidea IP accordingly) when running rndis > gadget with the Windows host machine. > > When the rndis gadget running for a long time (randomly), the udc would > suddenly stopped and no longger response to IN token sent from the host. > > The bus trace looks like this: > > BULK IN: > IN > DATA0 120 Bytes > ACK > BULK OUT: > OUT > DATA1 98 Bytes > NYET > BULK IN ?? > IN NAK > IN NAK > IN NAK > ..... > IN !!Propagated Error!!(Turnaround/Timeout Error) > > > > The driver doesn't receive any further interrupts when it stopped, > though the IN 102 Bytes transaction is finished on the bus, but the > TD_TOTAL_BYTES of that dTd is never updated. > > ep num: 1 dir: 1(in) > qh of current ep: 1 dir: 1(in) > qh maxpacklen: 0x22000000, token: 0x668080 > qh td_dma curr_dtd_ptr: 0x658403c0, next_dtd_ptr: 0x1 > qh buf p0: 0x672dcde, p1: 0x672e378, p2: 0x672f000, p3: 0x6730000, p4: 0x6731000 > req 0xd81e245540 len: **102**, first_dtd: 0x658403c0, last_dtd: 0x658403c0, dtd_count: 1, actual: 102 > [qh->curr_dtd_ptr]dtd dma 0x658403c0, token: 0x668080, err: 0x0, dtd_nxt: 0x65840540 > buf p0:0x672dcde p1:0x672e000 p2:0x672f000 p3:0x6730000 p4:0x6731000 scr: 0x0 > req 0xd81e245b40 len: 1558, first_dtd: 0x65840540, last_dtd: 0x65840540, dtd_count: 1, actual: 1558 > [---]dtd dma 0x65840540, token: 0x6168080, err: 0x0, dtd_nxt: 0x65840080 > buf p0:0x20ce50de p1:0x20ce6000 p2:0x20ce7000 p3:0x20ce8000 p4:0x20ce9000 scr: 0x0 > ...... > > epnak: 0x00070003 > epsetupstat: 0x00000000 > epprime: 0x00000000 > epflush: 0x00000000 > epstatus: 0x00020002 > Piyush is no longer with us but Radhey will take care about this. Thanks, Michal