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[media] vivid: add support for reduced fps in video out

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If reduced fps flag is set then check if other necessary conditions
are true for the given bt timing. If yes, then reduce the frame rate.
For vivid transmitter, timeperframe_vid_out controls the frame rate.
Adjusting the timeperframe_vid_out by scaling down pixel clock by
factor of 1000 / 1001.

Signed-off-by: Prashant Laddha <prladdha@cisco.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Prashant Laddha 2015-09-22 11:27:29 -03:00 committed by Mauro Carvalho Chehab
parent 8d7322f4f7
commit b883ba75e9
1 changed files with 8 additions and 1 deletions
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9
drivers/media/platform/vivid/vivid-vid-out.c
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@ -224,6 +224,7 @@ void vivid_update_format_out(struct vivid_dev *dev)
{
struct v4l2_bt_timings *bt = &dev->dv_timings_out.bt;
unsigned size, p;
u64 pixelclock;
switch (dev->output_type[dev->output]) {
case SVID:
@ -245,8 +246,14 @@ void vivid_update_format_out(struct vivid_dev *dev)
dev->sink_rect.width = bt->width;
dev->sink_rect.height = bt->height;
size = V4L2_DV_BT_FRAME_WIDTH(bt) * V4L2_DV_BT_FRAME_HEIGHT(bt);
if (can_reduce_fps(bt) && (bt->flags & V4L2_DV_FL_REDUCED_FPS))
pixelclock = div_u64(bt->pixelclock * 1000, 1001);
else
pixelclock = bt->pixelclock;
dev->timeperframe_vid_out = (struct v4l2_fract) {
size / 100, (u32)bt->pixelclock / 100
size / 100, (u32)pixelclock / 100
};
if (bt->interlaced)
dev->field_out = V4L2_FIELD_ALTERNATE;