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Hans Verkuil 7b575b6d8d media: vidioc-g-dv-timings.rst: fix wrong porch 
It is the vfrontporch of field 1 that is one half-line longer,
not the backporch.

The order of the vertical signals in an interlaced system is:

Field 1:

vsync
vbackporch
active video of field 1
vfrontporch + 0.5

Field 2:

il_vsync
il_vbackporch - 0.5
active video of field 2
il_vfrontporch

Interlaced systems that use HALF_LINE set the il_ fields as follows:

il_vfrontporch = vfrontporch
il_vsync = vsync
il_vbackporch = vbackporch + 1

So the total vertical blanking for field 1 is:

	vsync + vbackporch + vfrontporch + 0.5

and for field 2:

	vsync + vbackporch + 1 + vfrontporch - 0.5 ==
	vsync + vbackporch + vfrontporch + 0.5

So each field has the same number of half-lines.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
2019-12-13 09:23:09 +01:00
..
cec-drivers media: docs: brainless mass add SPDX headers to all media files 2018-12-05 10:40:34 -05:00
dvb-drivers media: Documentation: fix several typos 2019-03-01 09:54:06 -05:00
kapi media: Documentation: v4l2_ctrl_new_std_compound 2019-10-10 11:35:32 -03:00
uapi media: vidioc-g-dv-timings.rst: fix wrong porch 2019-12-13 09:23:09 +01:00
v4l-drivers media: doc-rst: add more info for resolution change blocks in ipu3 2019-11-05 08:19:16 -03:00
.gitignore media: docs: brainless mass add SPDX headers to all media files 2018-12-05 10:40:34 -05:00
audio.h.rst.exceptions media: docs: brainless mass add SPDX headers to all media files 2018-12-05 10:40:34 -05:00
ca.h.rst.exceptions media: docs: brainless mass add SPDX headers to all media files 2018-12-05 10:40:34 -05:00
cec.h.rst.exceptions media: uapi/linux/cec.h: add defines for the CEC UI Command Operand 2019-10-01 17:17:51 -03:00
conf_nitpick.py media: docs: brainless mass add SPDX headers to all media files 2018-12-05 10:40:34 -05:00
dmx.h.rst.exceptions media: docs: brainless mass add SPDX headers to all media files 2018-12-05 10:40:34 -05:00
frontend.h.rst.exceptions media: docs: brainless mass add SPDX headers to all media files 2018-12-05 10:40:34 -05:00
index.rst media: index.rst: exclude Indexes section from latex/pdf output 2019-03-30 09:42:35 -04:00
intro.rst media: docs: brainless mass add SPDX headers to all media files 2018-12-05 10:40:34 -05:00
lirc.h.rst.exceptions media: rc: xbox_remote: add protocol and set timeout 2019-04-22 13:02:53 -04:00
Makefile media: docs: brainless mass add SPDX headers to all media files 2018-12-05 10:40:34 -05:00
media_kapi.rst media: docs: brainless mass add SPDX headers to all media files 2018-12-05 10:40:34 -05:00
media_uapi.rst media: docs: brainless mass add SPDX headers to all media files 2018-12-05 10:40:34 -05:00
media.h.rst.exceptions media: docs: brainless mass add SPDX headers to all media files 2018-12-05 10:40:34 -05:00
net.h.rst.exceptions media: docs: brainless mass add SPDX headers to all media files 2018-12-05 10:40:34 -05:00
typical_media_device.svg media: add SPDX header to media uAPI files 2018-12-05 10:39:18 -05:00
video.h.rst.exceptions media: docs: brainless mass add SPDX headers to all media files 2018-12-05 10:40:34 -05:00
videodev2.h.rst.exceptions media: v4l: Add definitions for HEVC stateless decoding 2019-10-24 18:09:18 -03:00