Hi Doug, Am Donnerstag, 20. Juni 2019, 03:27:55 CEST schrieb Doug Anderson: > On Wed, Fri, 18 Mar 2016 Heiko Stuebner <he...@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 <he...@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
I just did a non-scientific test on my jerry+minnie and yes, simply reverting that patch does not seem to affect display bringup and I still get a prompt. So I guess we could just revert that patch in light of the changes. [patches welcome ;-) ] Heiko
