diff options
| author | Hans Verkuil <hverkuil@xs4all.nl> | 2007-07-28 19:45:50 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@infradead.org> | 2007-10-09 22:05:32 -0300 |
| commit | 37093b1ea600d84fbf7252baf12eedec85ae40f1 (patch) | |
| tree | ba78b73933c0d7b8989831c49a86f16c26f99b04 /drivers/media/video/ivtv/ivtv-queue.h | |
| parent | f4071b85ea0ca3bd06f63c330562b4cfdffa8473 (diff) | |
V4L/DVB (6047): ivtv: Fix scatter/gather DMA timeouts
It turns out that the cx23415/6 DMA engine cannot do scatter/gather DMA
reliably. Every so often depending on the phase of the moon and your
hardware configuration the cx2341x DMA engine simply chokes on it and
you have to reboot to get it working again.
This change replaced the scatter/gather DMA by single transfers at a time,
where the driver is now responsible for DMA-ing each buffer.
UDMA is still done using scatter/gather DMA, that will be fixed soon.
Many thanks to Mark Bryars <mark.bryars@etvinteractive.com> for discovering
the link between scatter/gather and the DMA timeouts.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'drivers/media/video/ivtv/ivtv-queue.h')
| -rw-r--r-- | drivers/media/video/ivtv/ivtv-queue.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/media/video/ivtv/ivtv-queue.h b/drivers/media/video/ivtv/ivtv-queue.h index 2ed8d548255d..14a9f7fe50aa 100644 --- a/drivers/media/video/ivtv/ivtv-queue.h +++ b/drivers/media/video/ivtv/ivtv-queue.h @@ -79,13 +79,13 @@ void ivtv_stream_free(struct ivtv_stream *s); static inline void ivtv_stream_sync_for_cpu(struct ivtv_stream *s) { if (ivtv_use_dma(s)) - pci_dma_sync_single_for_cpu(s->itv->dev, s->SG_handle, - sizeof(struct ivtv_SG_element) * s->buffers, PCI_DMA_TODEVICE); + pci_dma_sync_single_for_cpu(s->itv->dev, s->sg_handle, + sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE); } static inline void ivtv_stream_sync_for_device(struct ivtv_stream *s) { if (ivtv_use_dma(s)) - pci_dma_sync_single_for_device(s->itv->dev, s->SG_handle, - sizeof(struct ivtv_SG_element) * s->buffers, PCI_DMA_TODEVICE); + pci_dma_sync_single_for_device(s->itv->dev, s->sg_handle, + sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE); } |