On Sat, Mar 23, 2019 at 02:51:52PM +0800, zhuchangc...@cvte.com wrote:
> On Fri, Mar 22, 2019 at 11:14:14AM +0800, zhuchangc...@cvte.com wrote:
> > From above,you can kown when you export a GPIO ,it will do request,
> >
> > and there will set TX and RX register at the time same time.
> >
> > when you try to set direction in and set value, TX register value can
> > roll back
> >
> > the value,but RX register was not set, so who will set RX value back??
>
> I think you are looking at some older code. There is now function
> __intel_gpio_set_direction() that is supposed to set both buffers
> depending on the direction. It was introduced with commit 17fab473693e
> ("pinctrl: intel: Set pin direction properly").
>
>
> --> Yes ,I see the latest master branch, the __intel_gpio_set_direction will
> set RX and TX, but I still think we need to implement free function,cause
> it will help many other engineers,especailly for some manufactories use some
> module,and this modules embeded its own driver but not can be modified,
> if they want use the gpio control the module, they may meet the same problem.
What problem?
Is it reproducible on latest vanilla kernel?
--
With Best Regards,
Andy Shevchenko
