diff options
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-common.c | 33 | ||||
| -rw-r--r-- | include/media/v4l2-common.h | 4 |
2 files changed, 37 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c index 105f88cdb9d6..028133ba4c6b 100644 --- a/drivers/media/v4l2-core/v4l2-common.c +++ b/drivers/media/v4l2-core/v4l2-common.c @@ -597,6 +597,39 @@ int v4l_fill_dv_preset_info(u32 preset, struct v4l2_dv_enum_preset *info) } EXPORT_SYMBOL_GPL(v4l_fill_dv_preset_info); +/** + * v4l_match_dv_timings - check if two timings match + * @t1 - compare this v4l2_dv_timings struct... + * @t2 - with this struct. + * @pclock_delta - the allowed pixelclock deviation. + * + * Compare t1 with t2 with a given margin of error for the pixelclock. + */ +bool v4l_match_dv_timings(const struct v4l2_dv_timings *t1, + const struct v4l2_dv_timings *t2, + unsigned pclock_delta) +{ + if (t1->type != t2->type || t1->type != V4L2_DV_BT_656_1120) + return false; + if (t1->bt.width == t2->bt.width && + t1->bt.height == t2->bt.height && + t1->bt.interlaced == t2->bt.interlaced && + t1->bt.polarities == t2->bt.polarities && + t1->bt.pixelclock >= t2->bt.pixelclock - pclock_delta && + t1->bt.pixelclock <= t2->bt.pixelclock + pclock_delta && + t1->bt.hfrontporch == t2->bt.hfrontporch && + t1->bt.vfrontporch == t2->bt.vfrontporch && + t1->bt.vsync == t2->bt.vsync && + t1->bt.vbackporch == t2->bt.vbackporch && + (!t1->bt.interlaced || + (t1->bt.il_vfrontporch == t2->bt.il_vfrontporch && + t1->bt.il_vsync == t2->bt.il_vsync && + t1->bt.il_vbackporch == t2->bt.il_vbackporch))) + return true; + return false; +} +EXPORT_SYMBOL_GPL(v4l_match_dv_timings); + const struct v4l2_frmsize_discrete *v4l2_find_nearest_format( const struct v4l2_discrete_probe *probe, s32 width, s32 height) diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h index 4404829d48e5..447f4b6b716c 100644 --- a/include/media/v4l2-common.h +++ b/include/media/v4l2-common.h @@ -212,4 +212,8 @@ const struct v4l2_frmsize_discrete *v4l2_find_nearest_format( const struct v4l2_discrete_probe *probe, s32 width, s32 height); +bool v4l_match_dv_timings(const struct v4l2_dv_timings *t1, + const struct v4l2_dv_timings *t2, + unsigned pclock_delta); + #endif /* V4L2_COMMON_H_ */ |