ieee1394: video1394: DMA fix

This together with the phys_to_virt fix in lib/swiotlb.c::swiotlb_sync_sg
fixes video1394 DMA on machines with DMA bounce buffers, especially Intel
x86-64 machines with > 3GB RAM.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: David Moore <dcm@acm.org>
Tested-by: Nicolas Turro <Nicolas.Turro@inrialpes.fr>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/ieee1394/video1394.c b/drivers/ieee1394/video1394.c
index 598b19fc5989..f4d1ec00af65 100644
--- a/drivers/ieee1394/video1394.c
+++ b/drivers/ieee1394/video1394.c
@@ -489,6 +489,9 @@ static void wakeup_dma_ir_ctx(unsigned long l)
                         reset_ir_status(d, i);
                         d->buffer_status[d->buffer_prg_assignment[i]] = VIDEO1394_BUFFER_READY;
                         do_gettimeofday(&d->buffer_time[d->buffer_prg_assignment[i]]);
+                        dma_region_sync_for_cpu(&d->dma,
+                                d->buffer_prg_assignment[i] * d->buf_size,
+                                d->buf_size);
                 }
         }
 
@@ -1096,6 +1099,8 @@ static long video1394_ioctl(struct file *file,
                         DBGMSG(ohci->host->id, "Starting iso transmit DMA ctx=%d",
                                d->ctx);
                         put_timestamp(ohci, d, d->last_buffer);
+                        dma_region_sync_for_device(&d->dma,
+                                v.buffer * d->buf_size, d->buf_size);
 
                         /* Tell the controller where the first program is */
                         reg_write(ohci, d->cmdPtr,
@@ -1111,6 +1116,9 @@ static long video1394_ioctl(struct file *file,
                                       "Waking up iso transmit dma ctx=%d",
                                       d->ctx);
                                 put_timestamp(ohci, d, d->last_buffer);
+                                dma_region_sync_for_device(&d->dma,
+                                        v.buffer * d->buf_size, d->buf_size);
+
                                 reg_write(ohci, d->ctrlSet, 0x1000);
                         }
                 }