V4L/DVB (6712): ivtv: ivtv yuv stream handling change

Currently the yuv output stream buffer is divided into blocks whose size
depend on the broadcast standard selected during the driver init phase.
However, the standard can be changed after the init phase. This effectively
breaks the yuv output stream handler, since it relies on the different yuv
planes being block aligned.

This patch changes the setup, so that the block size is always the same. The
decoder dma function has been modified to cope with the fact that the second
yuv plane may no longer be block aligned. The start of the yuv frame must
still be at the beginning of a block, so the stream write function has also
been modified to ensure this is always true.

Also, the stream write function will now initiate a yuv dma transfer as soon
as a full frame is ready. It will not wait until the current write request
has completed, or the stream buffer becomes full.

Signed-off-by: Ian Armstrong <ian@iarmst.demon.co.uk>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 2 insertions, 6 deletions

diff --git a/drivers/media/video/ivtv/ivtv-driver.c b/drivers/media/video/ivtv/ivtv-driver.c
index 04179b7d1af0..48db22cc1bd8 100644
--- a/drivers/media/video/ivtv/ivtv-driver.c
+++ b/drivers/media/video/ivtv/ivtv-driver.c
@@ -970,7 +970,6 @@ static int __devinit ivtv_probe(struct pci_dev *dev,
                                 const struct pci_device_id *pci_id)
 {
         int retval = 0;
-        int yuv_buf_size;
         int vbi_buf_size;
         struct ivtv *itv;
 
@@ -1122,11 +1121,8 @@ static int __devinit ivtv_probe(struct pci_dev *dev,
         itv->stream_buf_size[IVTV_ENC_STREAM_TYPE_MPG] = 0x08000;
         itv->stream_buf_size[IVTV_ENC_STREAM_TYPE_PCM] = 0x01200;
         itv->stream_buf_size[IVTV_DEC_STREAM_TYPE_MPG] = 0x10000;
-
-        /* 0x15180 == 720 * 480 / 4, 0x19500 == 720 * 576 / 4 */
-        yuv_buf_size = itv->is_60hz ? 0x15180 : 0x19500;
-        itv->stream_buf_size[IVTV_DEC_STREAM_TYPE_YUV] = yuv_buf_size / 2;
-        itv->stream_buf_size[IVTV_ENC_STREAM_TYPE_YUV] = yuv_buf_size / 8;
+        itv->stream_buf_size[IVTV_DEC_STREAM_TYPE_YUV] = 0x10000;
+        itv->stream_buf_size[IVTV_ENC_STREAM_TYPE_YUV] = 0x08000;
 
         /* Setup VBI Raw Size. Should be big enough to hold PAL.
            It is possible to switch between PAL and NTSC, so we need to