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

Marek Vasut marex at denx.de
Tue Feb 21 20:04:07 UTC 2023


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 at denx.de>
---
Cc: Daniel Vetter <daniel at ffwll.ch>
Cc: David Airlie <airlied at gmail.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt at linaro.org>
Cc: Rob Herring <robh+dt at kernel.org>
Cc: Sam Ravnborg <sam at ravnborg.org>
Cc: Thierry Reding <thierry.reding at gmail.com>
Cc: devicetree at vger.kernel.org
Cc: dri-devel at lists.freedesktop.org
---
 .../bindings/display/panel/panel-timing.yaml  | 46 +++++++++----------
 1 file changed, 23 insertions(+), 23 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/panel/panel-timing.yaml b/Documentation/devicetree/bindings/display/panel/panel-timing.yaml
index 0d317e61edd8f..aea69b84ca5d8 100644
--- a/Documentation/devicetree/bindings/display/panel/panel-timing.yaml
+++ b/Documentation/devicetree/bindings/display/panel/panel-timing.yaml
@@ -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.
-- 
2.39.1



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