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| author | Jammy Huang <jammy_huang@aspeedtech.com> | 2022-01-25 09:44:09 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@kernel.org> | 2022-01-28 21:32:50 +0300 |
| commit | a922a0cb05f48382583b3fd2329a2c9a401a9fbe (patch) | |
| tree | 911d0ef94383a4556040fde1c8a33f9d0442d255 /include/uapi/linux/lirc.h | |
| parent | 26aea93bd59d60cd0e4526539a88fdcada76a234 (diff) | |
| download | linux-a922a0cb05f48382583b3fd2329a2c9a401a9fbe.tar.xz | |
media: aspeed: Correct values for detected timing
Correct timing's fp/sync/bp value based on the information below.
It should be noticed that the calculation formula should be changed
per sync polarity.
The sequence of signal: sync - backporch - video data - frontporch
The following registers start counting from sync's rising edge:
1. VR090: frame edge's left and right
2. VR094: frame edge's top and bottom
3. VR09C: counting from sync's rising edge to falling edge
[Vertical timing]
+--+ +-------------------+ +--+
| | | v i d e o | | |
+--+ +-----+ +-----+ +---+
vsync+--+
frame_top+--------+
frame_bottom+----------------------------+
+-------------------+
| v i d e o |
+--+ +-----+ +-----+ +---+
| | | |
+--+ +--+
vsync+-------------------------------+
frame_top+-----+
frame_bottom+-------------------------+
[Horizontal timing]
+--+ +-------------------+ +--+
| | | v i d e o | | |
+--+ +-----+ +-----+ +---+
hsync+--+
frame_left+--------+
frame_right+----------------------------+
+-------------------+
| v i d e o |
+--+ +-----+ +-----+ +---+
| | | |
+--+ +--+
hsync+-------------------------------+
frame_left+-----+
frame_right+-------------------------+
Ex. 1920x1200@60 whose vsync polarity is negative
VR098: c4d3efff, VR09C: 04cc001f
v-total = 0x4D3 (VR098[27:16]) = 1235
v-sync = 0x4CC (VR09C[27:16]) = 1228
[hverkuil: drop unused variable mds]
Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Diffstat (limited to 'include/uapi/linux/lirc.h')
0 files changed, 0 insertions, 0 deletions