diff options
Diffstat (limited to 'include/media/v4l2-dv-timings.h')
| -rw-r--r-- | include/media/v4l2-dv-timings.h | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/include/media/v4l2-dv-timings.h b/include/media/v4l2-dv-timings.h index a209526b6..1113c8874 100644 --- a/include/media/v4l2-dv-timings.h +++ b/include/media/v4l2-dv-timings.h @@ -107,12 +107,14 @@ bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t, * @standard: the timings according to the standard. * @pclock_delta: maximum delta in Hz between standard->pixelclock and * the measured timings. + * @match_reduced_fps: if true, then fail if V4L2_DV_FL_REDUCED_FPS does not + * match. * * Returns true if the two timings match, returns false otherwise. */ bool v4l2_match_dv_timings(const struct v4l2_dv_timings *measured, const struct v4l2_dv_timings *standard, - unsigned pclock_delta); + unsigned pclock_delta, bool match_reduced_fps); /** * v4l2_print_dv_timings() - log the contents of a dv_timings struct @@ -183,4 +185,25 @@ bool v4l2_detect_gtf(unsigned frame_height, unsigned hfreq, unsigned vsync, */ struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait); +/* + * reduce_fps - check if conditions for reduced fps are true. + * bt - v4l2 timing structure + * For different timings reduced fps is allowed if following conditions + * are met - + * For CVT timings: if reduced blanking v2 (vsync == 8) is true. + * For CEA861 timings: if V4L2_DV_FL_CAN_REDUCE_FPS flag is true. + */ +static inline bool can_reduce_fps(struct v4l2_bt_timings *bt) +{ + if ((bt->standards & V4L2_DV_BT_STD_CVT) && (bt->vsync == 8)) + return true; + + if ((bt->standards & V4L2_DV_BT_STD_CEA861) && + (bt->flags & V4L2_DV_FL_CAN_REDUCE_FPS)) + return true; + + return false; +} + + #endif |