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Read back CORB/RIRB control register to ensure DMA has stopped

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* Spec is somewhat unclear about whether that is really necessary,
  but let's play safe.
This commit is contained in:
Julian Harnath 2014-09-01 21:22:34 +02:00
parent 952aff674e
commit 78b950bd2d
1 changed files with 15 additions and 0 deletions
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15
src/add-ons/kernel/drivers/audio/hda/hda_controller.cpp
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@ -349,6 +349,21 @@ reset_controller(hda_controller* controller)
controller->Write8(HDAC_CORB_CONTROL, 0);
controller->Write8(HDAC_RIRB_CONTROL, 0);
uint8 corbControl = 0;
uint8 rirbControl = 0;
for (int timeout = 0; timeout < 10; timeout++) {
snooze(100);
corbControl = controller->Read8(HDAC_CORB_CONTROL);
rirbControl = controller->Read8(HDAC_RIRB_CONTROL);
if (corbControl == 0 && rirbControl == 0)
break;
}
if (corbControl != 0 || rirbControl != 0) {
dprintf("hda: unable to stop dma\n");
return B_BUSY;
}
// reset DMA position buffer
controller->Write32(HDAC_DMA_POSITION_BASE_LOWER, 0);
controller->Write32(HDAC_DMA_POSITION_BASE_UPPER, 0);