| Message ID | 20230221200407.16531-1-marex@denx.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | dt-bindings: display: Start the info graphics with HS/VS change | expand |
Hi Marek. On Tue, Feb 21, 2023 at 09:04:07PM +0100, Marek Vasut wrote: > 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> I recall being annoyed about this before. Reviewed-by: Sam Ravnborg <sam@ravnborg.org> > --- > Cc: Daniel Vetter <daniel@ffwll.ch> > Cc: David Airlie <airlied@gmail.com> > Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org> > Cc: Rob Herring <robh+dt@kernel.org> > Cc: Sam Ravnborg <sam@ravnborg.org> > Cc: Thierry Reding <thierry.reding@gmail.com> > Cc: devicetree@vger.kernel.org > Cc: dri-devel@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
On Tue, 21 Feb 2023 21:04:07 +0100, Marek Vasut wrote: > 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> > --- > Cc: Daniel Vetter <daniel@ffwll.ch> > Cc: David Airlie <airlied@gmail.com> > Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org> > Cc: Rob Herring <robh+dt@kernel.org> > Cc: Sam Ravnborg <sam@ravnborg.org> > Cc: Thierry Reding <thierry.reding@gmail.com> > Cc: devicetree@vger.kernel.org > Cc: dri-devel@lists.freedesktop.org > --- > .../bindings/display/panel/panel-timing.yaml | 46 +++++++++---------- > 1 file changed, 23 insertions(+), 23 deletions(-) > Acked-by: Rob Herring <robh@kernel.org>
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.
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> --- Cc: Daniel Vetter <daniel@ffwll.ch> Cc: David Airlie <airlied@gmail.com> Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org> Cc: Rob Herring <robh+dt@kernel.org> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Thierry Reding <thierry.reding@gmail.com> Cc: devicetree@vger.kernel.org Cc: dri-devel@lists.freedesktop.org --- .../bindings/display/panel/panel-timing.yaml | 46 +++++++++---------- 1 file changed, 23 insertions(+), 23 deletions(-)