Messages in this thread | | | Date | Fri, 30 Sep 2016 11:12:30 +0200 | From | Uwe Kleine-König <> | Subject | Re: [PATCHv4 2/3] tty/serial: at91: fix hardware handshake with GPIOs |
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Hello Richard,
On Fri, Sep 30, 2016 at 10:58:00AM +0200, Richard Genoud wrote: > Commit 1cf6e8fc8341 ("tty/serial: at91: fix RTS line management when > hardware handshake is enabled") broke the hardware handshake when GPIOs > were used. > > Hardware handshake with GPIOs used to work before this commit because > the CRTSCTS flag (termios->c_cflag) was set, but not the > ATMEL_US_USMODE_HWHS flag (controller register) ; so hardware handshake > enabled, but not handled by the controller.
What does the HWHS flag control? What if only RTS is a gpio and CTS is not? Or the other way round?
What is the problematic setup? I guess it's RTS and CTS are gpios and with that setting ATMEL_US_USMODE_HWHS is wrong? What happens if that happens?
Best regards Uwe
-- Pengutronix e.K. | Uwe Kleine-König | Industrial Linux Solutions | http://www.pengutronix.de/ |
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