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[media] v4l2-dv-timings: add condition checks for reduced fps

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Added a helper function to check necessary conditions required for
reduced fps. The reduced fps is supported for CVT and CEA861 timings.
CVT supports reduced fps only if reduced blanking v2 (indicated by
vsync = 8) is true. Whereas CEA861 supports reduced fps if
V4L2_DV_FL_CAN_REDUCE_FPS flag is true.

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>
This commit is contained in:
Prashant Laddha 2015-09-22 11:27:28 -03:00 committed by Mauro Carvalho Chehab
parent 0d51ebd3f4
commit 8d7322f4f7
2 changed files with 26 additions and 0 deletions
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5
drivers/media/v4l2-core/v4l2-dv-timings.c
View File

@ -210,7 +210,12 @@ bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t,
fnc, fnc_handle) && fnc, fnc_handle) &&
v4l2_match_dv_timings(t, v4l2_dv_timings_presets + i, v4l2_match_dv_timings(t, v4l2_dv_timings_presets + i,
pclock_delta)) { pclock_delta)) {
u32 flags = t->bt.flags & V4L2_DV_FL_REDUCED_FPS;
*t = v4l2_dv_timings_presets[i]; *t = v4l2_dv_timings_presets[i];
if (can_reduce_fps(&t->bt))
t->bt.flags |= flags;
return true; return true;
} }
} }

21
include/media/v4l2-dv-timings.h
View File

@ -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); 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 #endif