[media] cobalt: support reduced fps

Add support for reduced fps (i.e. 59.94 Hz instead of 60 Hz) for the
HDMI output.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/media/pci/cobalt/cobalt-v4l2.c b/drivers/media/pci/cobalt/cobalt-v4l2.c
index d05672fe9ff9..5c76637900d0 100644
--- a/drivers/media/pci/cobalt/cobalt-v4l2.c
+++ b/drivers/media/pci/cobalt/cobalt-v4l2.c
@@ -161,8 +161,11 @@ static void cobalt_enable_output(struct cobalt_stream *s)
         struct v4l2_subdev_format sd_fmt = {
                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
         };
+        u64 clk = bt->pixelclock;
 
-        if (!cobalt_cpld_set_freq(cobalt, bt->pixelclock)) {
+        if (bt->flags & V4L2_DV_FL_REDUCED_FPS)
+                clk = div_u64(clk * 1000ULL, 1001);
+        if (!cobalt_cpld_set_freq(cobalt, clk)) {
                 cobalt_err("pixelclock out of range\n");
                 return;
         }
@@ -644,7 +647,7 @@ static int cobalt_s_dv_timings(struct file *file, void *priv_fh,
                 return 0;
         }
 
-        if (v4l2_match_dv_timings(timings, &s->timings, 0, false))
+        if (v4l2_match_dv_timings(timings, &s->timings, 0, true))
                 return 0;
 
         if (vb2_is_busy(&s->q))