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>

diff --git a/drivers/ieee1394/video1394.c b/drivers/ieee1394/video1394.c
index 598b19f..f4d1ec0 100644 (file)
--- 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);
                        }
                }