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usbehci, usbxhci: add *noehcihandoff= and *noxhcihandoff= parameters

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on Samsung ATIV Smart PC Pro XE00T1C-A01CL, the EHCI handoff
causes the system to freeze in UEFI mode as soon as we assert
the os semaphore bit.

until a general solution is found, provide these parameters to
disable the handoff for now as it seems to otherwise work fine.
This commit is contained in:
cinap_lenrek 2018-10-06 00:29:05 +02:00
parent 83876083c9
commit f9839ed0a2
2 changed files with 7 additions and 5 deletions
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2
sys/src/9/pc/usbehcipc.c
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@ -41,7 +41,7 @@ getehci(Ctlr* ctlr)
off = ehciecap(ctlr, Clegacy);
if(off == -1)
return;
if(pcicfgr8(ctlr->pcidev, off+CLbiossem) != 0){
if(getconf("*noehcihandoff") == nil && pcicfgr8(ctlr->pcidev, off+CLbiossem) != 0){
dprint("ehci %#p: bios active, taking over...\n", ctlr->capio);
pcicfgw8(ctlr->pcidev, off+CLossem, 1);
for(i = 0; i < 100; i++){

10
sys/src/9/pc/usbxhci.c
View file

@ -393,11 +393,13 @@ handoff(Ctlr *ctlr)
if((r = xecp(ctlr, 1, nil)) == nil)
return;
r[0] |= 1<<24; /* request ownership */
for(i = 0; (r[0] & (1<<16)) != 0 && i<100; i++)
tsleep(&up->sleep, return0, nil, 10);
if(getconf("*noxhcihandoff") == nil){
r[0] |= 1<<24; /* request ownership */
for(i = 0; (r[0] & (1<<16)) != 0 && i<100; i++)
tsleep(&up->sleep, return0, nil, 10);
r[0] &= ~(1<<16); /* in case of timeout */
}
r[1] = 0; /* disable SMI interrupts */
r[0] &= ~(1<<16); /* in case of timeout */
}
static void