diff options
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-dv-timings.c | 5 | ||||
| -rw-r--r-- | include/media/v4l2-dv-timings.h | 21 |
2 files changed, 26 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-dv-timings.c b/drivers/media/v4l2-core/v4l2-dv-timings.c index edb4125d1018..9926d521ea88 100644 --- a/drivers/media/v4l2-core/v4l2-dv-timings.c +++ b/drivers/media/v4l2-core/v4l2-dv-timings.c @@ -210,7 +210,12 @@ bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t, fnc, fnc_handle) && v4l2_match_dv_timings(t, v4l2_dv_timings_presets + i, pclock_delta)) { + u32 flags = t->bt.flags & V4L2_DV_FL_REDUCED_FPS; + *t = v4l2_dv_timings_presets[i]; + if (can_reduce_fps(&t->bt)) + t->bt.flags |= flags; + return true; } } diff --git a/include/media/v4l2-dv-timings.h b/include/media/v4l2-dv-timings.h index a209526b6014..69829a5a1368 100644 --- a/include/media/v4l2-dv-timings.h +++ b/include/media/v4l2-dv-timings.h @@ -183,4 +183,25 @@ 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 |