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[209.85.166.45]) by smtp.gmail.com with ESMTPSA id e26sm17443083iod.10.2019.06.19.18.28.10 for (version=TLS1_3 cipher=AEAD-AES128-GCM-SHA256 bits=128/128); Wed, 19 Jun 2019 18:28:10 -0700 (PDT) Received: by mail-io1-f45.google.com with SMTP id s7so1005726iob.11 for ; Wed, 19 Jun 2019 18:28:10 -0700 (PDT) X-Received: by 2002:a5e:d615:: with SMTP id w21mr12594037iom.0.1560994089873; Wed, 19 Jun 2019 18:28:09 -0700 (PDT) MIME-Version: 1.0 References: <1458265206-15733-1-git-send-email-heiko@sntech.de> <1458265206-15733-5-git-send-email-heiko@sntech.de> In-Reply-To: <1458265206-15733-5-git-send-email-heiko@sntech.de> From: Doug Anderson Date: Wed, 19 Jun 2019 18:27:55 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 04/10] ARM: dts: rockchip: add startup delay to rk3288-veyron panel-regulators To: "open list:ARM/Rockchip SoC..." X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190619_182812_756585_F41D67B2 X-CRM114-Status: GOOD ( 15.12 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Heiko Stuebner , LKML , Matthias Kaehlcke , Yakir Yang , Enric Balletbo i Serra , Linux ARM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, On Wed, Fri, 18 Mar 2016 Heiko Stuebner 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 > --- > 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel