haraldwolff/qemu-patch-raspberry4
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ide: Reset current_addr after stopping DMA

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Whenever SSBM is reset in the command register all state information is lost.
Restarting DMA means that current_addr must be reset to the base address of the
PRD table. The OS is not required to change the base address register before
starting a DMA operation, it can reuse the value it wrote for an earlier
request.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
This commit is contained in:
Kevin Wolf 2010-11-26 16:36:16 +01:00
parent c29947bbb0
commit b76876e602
1 changed files with 1 additions and 1 deletions
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2
hw/ide/pci.c
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@ -65,6 +65,7 @@ void bmdma_cmd_writeb(void *opaque, uint32_t addr, uint32_t val)
#endif
}
} else {
bm->cur_addr = bm->addr;
if (!(bm->status & BM_STATUS_DMAING)) {
bm->status |= BM_STATUS_DMAING;
/* start dma transfer if possible */
@ -101,7 +102,6 @@ static void bmdma_addr_write(IORange *ioport, uint64_t addr,
#endif
bm->addr &= ~(mask << shift);
bm->addr |= ((data & mask) << shift) & ~3;
bm->cur_addr = bm->addr;
}
const IORangeOps bmdma_addr_ioport_ops = {