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dt-bindings: display: Start the info graphics with HS/VS change
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
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Documentation/devicetree/bindings/display/panel/panel-timing.yaml
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Documentation/devicetree/bindings/display/panel/panel-timing.yaml
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The parameters are defined as seen in the following illustration.
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-
+----------+-------------------------------------+----------+-------+
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-
| | ^ | | |
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| | |vback_porch | | |
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-
| | v | | |
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+----------#######################################----------+-------+
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-
| # ^ # | |
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| # | # | |
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| hback # | # hfront | hsync |
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| porch # | hactive # porch | len |
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|<-------->#<-------+--------------------------->#<-------->|<----->|
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| # | # | |
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-
| # |vactive # | |
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| # | # | |
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| # v # | |
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-
+----------#######################################----------+-------+
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-
| | ^ | | |
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-
| | |vfront_porch | | |
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-
| | v | | |
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-
+----------+-------------------------------------+----------+-------+
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-
| | ^ | | |
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| | |vsync_len | | |
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-
| | v | | |
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-
+----------+-------------------------------------+----------+-------+
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+
+-------+----------+-------------------------------------+----------+
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+
| | | ^ | |
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+
| | | |vsync_len | |
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+
| | | v | |
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+
+-------+----------+-------------------------------------+----------+
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+
| | | ^ | |
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+
| | | |vback_porch | |
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+
| | | v | |
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+
+-------+----------#######################################----------+
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+
| | # ^ # |
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+
| | # | # |
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+
| hsync | hback # | # hfront |
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| len | porch # | hactive # porch |
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+
|<----->|<-------->#<-------+--------------------------->#<-------->|
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+
| | # | # |
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+
| | # |vactive # |
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+
| | # | # |
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+
| | # v # |
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+
+-------+----------#######################################----------+
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+
| | | ^ | |
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+
| | | |vfront_porch | |
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+
| | | v | |
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+
+-------+----------+-------------------------------------+----------+
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The following is the panel timings shown with time on the x-axis.