Hi Doug, Sean:
I would like to move this forward.
On 26 February 2018 at 15:23, Doug Anderson <dianders@xxxxxxxxxxxx> wrote:
> Hi,
>
> On Thu, Feb 8, 2018 at 9:48 AM, Sean Paul <seanpaul@xxxxxxxxxxxx> wrote:
>> This patch adds an override mode for kevin devices. The mode increases
>> both back porches to allow a pixel clock of 26666kHz as opposed to the
>> 'typical' value of 252750kHz. This is needed to avoid interference with
>> the touch digitizer on these laptops.
>>
>> Changes in v2:
>> - Wrap the timing in display-timings node to match binding (Rob/Thierry)
>> Changes in v3:
>> - Unwrap the timing from display-timings and rename panel-timing (Rob)
>>
>> Cc: Doug Anderson <dianders@xxxxxxxxxxxx>
>> Cc: Eric Anholt <eric@xxxxxxxxxx>
>> Cc: Heiko Stuebner <heiko@xxxxxxxxx>
>> Cc: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx>
>> Cc: Rob Herring <robh+dt@xxxxxxxxxx>
>> Cc: Stéphane Marchesin <marcheu@xxxxxxxxxxxx>
>> Cc: Thierry Reding <thierry.reding@xxxxxxxxx>
>> Cc: devicetree@xxxxxxxxxxxxxxx
>> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
>> Cc: linux-rockchip@xxxxxxxxxxxxxxxxxxx
>> Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
>> ---
>> arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts | 14 ++++++++++++++
>> 1 file changed, 14 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts b/arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts
>> index 191a6bcb1704..658411ce37ea 100644
>> --- a/arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts
>> +++ b/arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts
>> @@ -98,6 +98,20 @@
>> backlight = <&backlight>;
>> power-supply = <&pp3300_disp>;
>>
>> + panel-timing {
>> + clock-frequency = <266604720>;
>> + hactive = <2400>;
>> + hfront-porch = <48>;
>> + hback-porch = <84>;
>> + hsync-len = <32>;
>> + hsync-active = <0>;
>> + vactive = <1600>;
>> + vfront-porch = <3>;
>> + vback-porch = <120>;
>> + vsync-len = <10>;
>> + vsync-active = <0>;
>> + };
>> +
>> ports {
>> panel_in_edp: endpoint {
>> remote-endpoint = <&edp_out_panel>;
>
> Kristian brought an old bug to my attention
> <https://bugs.chromium.org/p/chromium/issues/detail?id=750354> and it
> made me think. Should we somehow adjust the bindings here to account
> for the fact that a board may source several different panels?
>
> AKA: on some boards an ODM may want to second source (or third source,
> or ...) the panel. They'll randomly connect several different panels
> to the board and ship the boards out. The panels are all compatible
> electrically (same power sequencing) but might need slightly different
> timings. In this particular case there's no board-level strappings
> for the different panels--it's assumed that the EDID on the panels can
> be used to distinguish them.
>
> In that case it seems like it would be nice to allow specifying more
> than one "panel-timing" nodes. Maybe keyed off some type of ID that's
> present in the EDID?
>
>
> Is that something we'd want to account for before we land this series?
> It seems like it would just be adding an extra level of nodes?
>
AFAICS, there is no EDID without a DDC bus, which we don't
seem to have on gru platforms, do we?
Regards,
--
Ezequiel García, VanguardiaSur
www.vanguardiasur.com.ar
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