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17 May 2024, 11:00:25 UTC
Revision dfd37668ea6d5029fb5d8a66ea5e202d0655fad7 authored by Desmond Liu on 27 February 2015, 00:35:57 UTC, committed by Greg Kroah-Hartman on 07 March 2015, 02:06:51 UTC 
serial: 8250_dw: Fix get_mctrl behaviour
 
Fixed behaviour of get_mctrl() serial driver function as documented in:
https://www.kernel.org/doc/Documentation/serial/driver

Added device-tree properties 'dcd-override', 'dsr-override',
'cts-override', and 'ri-override' specific to the Synopsis 8250
DesignWare UART driver. Allows one to force Data Carrier Detect,
Clear To Send, and Data Set Ready signals to permanently be reported as
active. The Ring indicator can be forced to be reported as inactive.

It is possible that if modem control signalling is enabled on a port
that doesn't have these pins (e.g. - a simple two wire Tx/Rx port), the
driver can hang indefinitely waiting for the state to change. The new
DT properties allow the driver to ignore the state of these pins on
serial ports that don't support them, as recommended in the kernel
documentation.

Reviewed-by: JD (Jiandong) Zheng <jdzheng@broadcom.com>
Signed-off-by: Jonathan Richardson <jonathar@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 parent 7cf9110
History
Tip revision: dfd37668ea6d5029fb5d8a66ea5e202d0655fad7 authored by Desmond Liu on 27 February 2015, 00:35:57 UTC
serial: 8250_dw: Fix get_mctrl behaviour
Tip revision: dfd3766
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