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media: v4l2-dv-timings: Introduce v4l2_calc_timeperframe helper

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A new helper function was introduced to facilitate the calculation
of time per frame value whenever we have access to the full
v4l2_dv_timings structure.

This should be used only for receivers and only when there is
enough accuracy in the measured pixel clock value as well as in
the horizontal/vertical values.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Jose Abreu
2017-03-21 07:49:17 -04:00
committed by Mauro Carvalho Chehab
parent f992cee5ef
commit 87f9ed85d0
2 changed files with 50 additions and 0 deletions
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11
include/media/v4l2-dv-timings.h
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@@ -10,6 +10,17 @@
#include <linux/videodev2.h>
/**
* v4l2_calc_timeperframe - helper function to calculate timeperframe based
* v4l2_dv_timings fields.
* @t: Timings for the video mode.
*
* Calculates the expected timeperframe using the pixel clock value and
* horizontal/vertical measures. This means that v4l2_dv_timings structure
* must be correctly and fully filled.
*/
struct v4l2_fract v4l2_calc_timeperframe(const struct v4l2_dv_timings *t);
/*
* v4l2_dv_timings_presets: list of all dv_timings presets.
*/