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ide: fix DMA register transitions

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ATA8-APT defines the state transitions for both a host controller and
for the hardware device during the lifecycle of a DMA transfer, in
section 9.7 "DMA command protocol."

One of the interesting tidbits here is that when a device transitions
from DDMA0 ("Prepare state") to DDMA1 ("Data_Transfer State"), it can
choose to set either BSY or DRQ to signal this transition, but not both.

as ide_sector_dma_start is the last point in our preparation process
before we begin the real data transfer process (for either AHCI or BMDMA),
this is the correct transition point for DDMA0 to DDMA1.

I have chosen !BSY && DRQ for QEMU to make the transition from DDMA0 the
most obvious.

Reported-by: Benjamin David Lunt <fys@fysnet.net>
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Tested-by: Stefan Weil <sw@weilnetz.de>
Message-id: 1470175541-19344-1-git-send-email-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
This commit is contained in:
John Snow 2016-09-29 14:46:15 -04:00
parent c640f2849e
commit 9da82227ca
1 changed files with 1 additions and 1 deletions
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2
hw/ide/core.c
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@ -908,7 +908,7 @@ eot:
static void ide_sector_start_dma(IDEState *s, enum ide_dma_cmd dma_cmd)
{
s->status = READY_STAT | SEEK_STAT | DRQ_STAT | BUSY_STAT;
s->status = READY_STAT | SEEK_STAT | DRQ_STAT;
s->io_buffer_size = 0;
s->dma_cmd = dma_cmd;