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usbxhci: fix endpoint stall recovery, handle Ep.clrhalt flag

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after issuing CR_RESETEP command, we have to invalidate
the endpoints output context buffer so that the halted/error
status reflects the new state. not doing so resulted in
the halted state to be stuck and we continued issuing
endpoint reset commands when we where already recovered.

handle the devusb Ep.clrhalt flag from devusb that userspace
uses to force a endpoint reset on the next transaction.
This commit is contained in:
cinap_lenrek 2019-09-22 18:51:41 +02:00
parent 71a1d11a81
commit 490c3d87cb
1 changed files with 11 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

16
sys/src/9/port/usbxhci.c
View file

@ -1368,20 +1368,26 @@ isowrite(Ep *ep, uchar *p, long n)
}
static char*
unstall(Ring *r)
unstall(Ep *ep, Ring *r)
{
char *err;
switch(r->ctx[0]&7){
case 2: /* halted */
case 4: /* error */
r->stopped = 1;
ep->clrhalt = 1;
}
if(ep->clrhalt){
ep->clrhalt = 0;
err = ctlrcmd(r->slot->ctlr, CR_RESETEP | (r->id<<16) | (r->slot->id<<24), 0, 0, nil);
dmaflush(0, r->ctx, 8*4 << r->slot->ctlr->csz);
if(err != nil)
return err;
r->stopped = 1;
}
if(r->stopped){
err = ctlrcmd(r->slot->ctlr, CR_SETTRDQP | (r->id<<16) | (r->slot->id<<24), 0, resetring(r), nil);
dmaflush(0, r->ctx, 8*4 << r->slot->ctlr->csz);
if(err != nil)
return err;
r->stopped = 0;
@ -1444,7 +1450,7 @@ epread(Ep *ep, void *va, long n)
nexterror();
}
if((err = unstall(io->ring)) != nil)
if((err = unstall(ep, io->ring)) != nil)
error(err);
dmaflush(1, p, n);
@ -1517,7 +1523,7 @@ epwrite(Ep *ep, void *va, long n)
io->b->wp += len;
}
}
if((err = unstall(ring)) != nil)
if((err = unstall(ep, ring)) != nil)
error(err);
if((ring->ctx[1]>>16) != ep->maxpkt){
@ -1596,7 +1602,7 @@ epwrite(Ep *ep, void *va, long n)
nexterror();
}
if((err = unstall(io->ring)) != nil)
if((err = unstall(ep, io->ring)) != nil)
error(err);
dmaflush(1, p, n);