Messages in this thread | | | From | Doug Anderson <> | Date | Wed, 19 Jun 2019 18:27:55 -0700 | Subject | Re: [PATCH 04/10] ARM: dts: rockchip: add startup delay to rk3288-veyron panel-regulators |
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Hi,
On Wed, Fri, 18 Mar 2016 Heiko Stuebner <heiko@sntech.de> wrote: > > The panels need a bit of time to actually turn on. If this isn't > observed, this results in problems when trying talk to the panels > and thus produces detection errors. 100ms seem to be a safe value > for the time being. > > Signed-off-by: Heiko Stuebner <heiko@sntech.de> > --- > arch/arm/boot/dts/rk3288-veyron-jaq.dts | 1 + > arch/arm/boot/dts/rk3288-veyron-jerry.dts | 1 + > arch/arm/boot/dts/rk3288-veyron-minnie.dts | 1 + > arch/arm/boot/dts/rk3288-veyron-speedy.dts | 1 + > 4 files changed, 4 insertions(+)
I know it was 3 years ago, but any idea how to reproduce the problems you were seeing without this patch? I believe the downstream kernel never had any delay like this and I'm not aware of any issues.
I wonder if the need for this extra 100 ms delay is no longer there now that we have:
3157694d8c7f pwm-backlight: Add support for PWM delays proprieties. 5fb5caee92ba pwm-backlight: Enable/disable the PWM before/after LCD enable toggle. 6d5922dd0d60 ARM: dts: rockchip: set PWM delay backlight settings for Veyron
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