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[2/2] xnu kernel expects FLUSH to be cleared on STOP

Message ID 1361468051-19292-2-git-send-email-amade@asmblr.net
State New
Headers show

Commit Message

Amadeusz Sławiński Feb. 21, 2013, 5:34 p.m. UTC 
otherwise it gets stuck in a loop
so clear it when unsetting run when flush is set

void
IODBDMAStop( volatile IODBDMAChannelRegisters *registers)
{

	IOSetDBDMAChannelControl( registers,
	IOClearDBDMAChannelControlBits( kdbdmaRun )
		| IOSetDBDMAChannelControlBits(  kdbdmaFlush ));

DBDMA: writel 0x0000000000000b00 <= 0xa0002000
DBDMA: channel 0x16 reg 0x0
DBDMA:     status 0x00002000

	while( IOGetDBDMAChannelStatus( registers) & (
			kdbdmaActive | kdbdmaFlush))
		eieio();

DBDMA: readl 0x0000000000000b04 => 0x00002000
DBDMA: channel 0x16 reg 0x1
DBDMA: readl 0x0000000000000b04 => 0x00002000
DBDMA: channel 0x16 reg 0x1
DBDMA: readl 0x0000000000000b04 => 0x00002000
DBDMA: channel 0x16 reg 0x1
DBDMA: readl 0x0000000000000b04 => 0x00002000
DBDMA: channel 0x16 reg 0x1
it continues to get printed

}

Signed-off-by: Amadeusz Sławiński <amade@asmblr.net>
---
 hw/mac_dbdma.c | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/hw/mac_dbdma.c b/hw/mac_dbdma.c
index b894ab2..34c1757 100644
--- a/hw/mac_dbdma.c
+++ b/hw/mac_dbdma.c
@@ -688,6 +688,10 @@  dbdma_control_write(DBDMA_channel *ch)
     if ((ch->regs[DBDMA_STATUS] & RUN) && !(status & RUN)) {
         /* RUN is cleared */
         status &= ~(ACTIVE|DEAD);
+        if ((status & FLUSH) && ch->flush) {
+            ch->flush(&ch->io);
+            status &= ~FLUSH;
+	}
     }
 
     DBDMA_DPRINTF("    status 0x%08x\n", status);