github.com/livingcomputermuseum.UniBone
1
0
Fork 0
mirror of https://github.com/livingcomputermuseum/UniBone.git synced 2026-03-02 17:55:02 +00:00
Code Issues Releases Wiki Activity

Workaround for low-level DMA issue; give up waiting for DMA transfers if enough time passes.

Browse Source 
This works around an as-yet-unexplained PRU bug.
This commit is contained in:
Josh Dersch
2019-05-09 07:26:55 +02:00
parent 22be88832c
commit bb546db52a
1 changed files with 17 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
10.01_base/2_src/arm/unibusadapter.cpp
View File

@@ -652,10 +652,25 @@ void unibusadapter_c::dma_worker()
//
// Wait for the transfer to complete.
// TODO: we're polling the mailbox; is there a more efficient way to do this?
timeout_c timeout;
while (request_DMA_active(nullptr))
timeout_c timeout;
int retries = 0;
while (request_DMA_active(nullptr) && retries < 10000)
{
timeout.wait_us(50);
retries++;
}
//
// TODO: this should not be necessary. There are rare occasions
// where it appears that the PRU dma transfer is interrupted
// but never clears the DMA active flag, so we hang in the loop above
// forever.
// Nothing to do in that case but give up.
// And log the issue. Should get to the root of this..
//
if (retries == 10000)
{
INFO("dma timeout");
}
if (dmaReq->GetUnibusControl() == UNIBUS_CONTROL_DATI)