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firewire: ohci: pass correct iso xmit timestamps to core

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Here is the final set of patches I used to get ffado to work with the
new firewire stack.  With these patches, I was able to start ardour
and record from and playback to my PreSonus Inspire1394 from a
(mostly) Fedora 12 system.

Signed-off-by: Jay Fenlason <fenlason@redhat.com>

Until now, firewire-ohci exposed only the transmit cycle of the last
transmitted packet at each isochronous transmit complete event.  This
made it impossible for FFADO (FireWire audio drivers in userspace) to
synchronize audio-out streams.  The fix is to store the timestamp of
each packet in the iso xmit event.  As a bonus, the transfer status is
stored too.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Jay Fenlason 2009-11-21 00:05:56 +01:00 committed by Stefan Richter
parent 5ed1f321a7
commit 31769cef2e
1 changed files with 20 additions and 5 deletions
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25
drivers/firewire/ohci.c
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@ -1904,15 +1904,30 @@ static int handle_it_packet(struct context *context,
{
struct iso_context *ctx =
container_of(context, struct iso_context, context);
int i;
struct descriptor *pd;
if (last->transfer_status == 0)
/* This descriptor isn't done yet, stop iteration. */
for (pd = d; pd <= last; pd++)
if (pd->transfer_status)
break;
if (pd > last)
/* Descriptor(s) not done yet, stop iteration */
return 0;
if (le16_to_cpu(last->control) & DESCRIPTOR_IRQ_ALWAYS)
i = ctx->header_length;
if (i + 4 < PAGE_SIZE) {
/* Present this value as big-endian to match the receive code */
*(__be32 *)(ctx->header + i) = cpu_to_be32(
((u32)le16_to_cpu(pd->transfer_status) << 16) |
le16_to_cpu(pd->res_count));
ctx->header_length += 4;
}
if (le16_to_cpu(last->control) & DESCRIPTOR_IRQ_ALWAYS) {
ctx->base.callback(&ctx->base, le16_to_cpu(last->res_count),
0, NULL, ctx->base.callback_data);
ctx->header_length, ctx->header,
ctx->base.callback_data);
ctx->header_length = 0;
}
return 1;
}