On Mon, Jan 11, 2021 at 09:40:00PM +0800, DENG Qingfang wrote: > On Mon, Jan 11, 2021 at 7:04 PM Russell King - ARM Linux admin > <linux@xxxxxxxxxxxxxxx> wrote: > > > > FYI, Documentation/driver-api/gpio/consumer.rst says: > > > > For output GPIOs, the value provided becomes the initial output value. > > This helps avoid signal glitching during system startup. > > > > Setting the pin to be an output, and then setting its initial value > > does not avoid the glitch. You may wish to investigate whether you > > can set the value before setting the pin as an output to avoid this > > issue. > > > > So, setting the Output Enable bit _after_ setting the direction and > initial value should avoid this issue. Right? It depends on the hardware. I don't know how your hardware works, so I can't say whether doing anything will result in correct behaviour, or even work. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
