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dt-bindings: display: Start the info graphics with HS/VS change

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The VS signal change is synchronized to HS signal change, start the
info graphics with that event, instead of having that event occur in
the middle of it.

Scope trace of DPI bus with HS/VS active HIGH looks as follows:
         ________________...__
VS...___/__         __        \______...
HS...___/  \_______/  \__...__/  \___...
        ^                        ^
	|                        |
        |    Used to start here -'
	|
	'--- Start info graphics here

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230221200407.16531-1-marex@denx.de
This commit is contained in:
Marek Vasut 2023-02-21 21:04:07 +01:00
parent 2792aed16c
commit 3e66f493e1
1 changed files with 23 additions and 23 deletions
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46
Documentation/devicetree/bindings/display/panel/panel-timing.yaml
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@ -17,29 +17,29 @@ description: |
The parameters are defined as seen in the following illustration.
+----------+-------------------------------------+----------+-------+
| | ^ | | |
| | |vback_porch | | |
| | v | | |
+----------#######################################----------+-------+
| # ^ # | |
| # | # | |
| hback # | # hfront | hsync |
| porch # | hactive # porch | len |
|<-------->#<-------+--------------------------->#<-------->|<----->|
| # | # | |
| # |vactive # | |
| # | # | |
| # v # | |
+----------#######################################----------+-------+
| | ^ | | |
| | |vfront_porch | | |
| | v | | |
+----------+-------------------------------------+----------+-------+
| | ^ | | |
| | |vsync_len | | |
| | v | | |
+----------+-------------------------------------+----------+-------+
+-------+----------+-------------------------------------+----------+
| | | ^ | |
| | | |vsync_len | |
| | | v | |
+-------+----------+-------------------------------------+----------+
| | | ^ | |
| | | |vback_porch | |
| | | v | |
+-------+----------#######################################----------+
| | # ^ # |
| | # | # |
| hsync | hback # | # hfront |
| len | porch # | hactive # porch |
|<----->|<-------->#<-------+--------------------------->#<-------->|
| | # | # |
| | # |vactive # |
| | # | # |
| | # v # |
+-------+----------#######################################----------+
| | | ^ | |
| | | |vfront_porch | |
| | | v | |
+-------+----------+-------------------------------------+----------+
The following is the panel timings shown with time on the x-axis.