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firewire: ohci: do not start DMA contexts before link is enabled

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OHCI 1.1 5.7.3 not only forbids enabling or starting any DMA contexts
before the linkEnable bit is set, but also explicitly warns of undefined
behaviour if this order is violated.

Don't violate it then.

Signed-off-by: Clemens Ladisch <[email protected]>
Signed-off-by: Stefan Richter <[email protected]>
This commit is contained in:
Clemens Ladisch 2011-04-11 09:56:12 +02:00 • committed by Stefan Richter
commit ecf8328e59
1 changed files with 7 additions and 6 deletions
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13
drivers/firewire/ohci.c
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@ -2066,8 +2066,6 @@ static int ohci_enable(struct fw_card *card,
reg_write(ohci, OHCI1394_SelfIDBuffer, ohci->self_id_bus);
reg_write(ohci, OHCI1394_LinkControlSet,
OHCI1394_LinkControl_rcvSelfID |
OHCI1394_LinkControl_rcvPhyPkt |
OHCI1394_LinkControl_cycleTimerEnable |
OHCI1394_LinkControl_cycleMaster);
@ -2094,9 +2092,6 @@ static int ohci_enable(struct fw_card *card,
reg_write(ohci, OHCI1394_FairnessControl, 0);
card->priority_budget_implemented = ohci->pri_req_max != 0;
ar_context_run(&ohci->ar_request_ctx);
ar_context_run(&ohci->ar_response_ctx);
reg_write(ohci, OHCI1394_PhyUpperBound, 0x00010000);
reg_write(ohci, OHCI1394_IntEventClear, ~0);
reg_write(ohci, OHCI1394_IntMaskClear, ~0);
@ -2186,7 +2181,13 @@ static int ohci_enable(struct fw_card *card,
reg_write(ohci, OHCI1394_HCControlSet,
OHCI1394_HCControl_linkEnable |
OHCI1394_HCControl_BIBimageValid);
flush_writes(ohci);
reg_write(ohci, OHCI1394_LinkControlSet,
OHCI1394_LinkControl_rcvSelfID |
OHCI1394_LinkControl_rcvPhyPkt);
ar_context_run(&ohci->ar_request_ctx);
ar_context_run(&ohci->ar_response_ctx); /* also flushes writes */
/* We are ready to go, reset bus to finish initialization. */
fw_schedule_bus_reset(&ohci->card, false, true);