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

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>

diff --git a/drivers/media/platform/vivid/vivid-vid-out.c b/drivers/media/platform/vivid/vivid-vid-out.c
index b77acb6a70138a4f093c783f73e0b4dae8ddddad..db645abd49672b2dfb52c795dbc5cce63abe48b6 100644 (file)
--- a/drivers/media/platform/vivid/vivid-vid-out.c
+++ b/drivers/media/platform/vivid/vivid-vid-out.c
@@ -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;