Commit 3e66f493 authored by Marek Vasut's avatar Marek Vasut
Browse files

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: default avatarMarek Vasut <marex@denx.de>
Reviewed-by: default avatarSam Ravnborg <sam@ravnborg.org>
Acked-by: default avatarRob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230221200407.16531-1-marex@denx.de
parent 2792aed1

Documentation/devicetree/bindings/display/panel/panel-timing.yaml

+23 −23
Original line number Diff line number Diff line
@@ -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.