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authorFabio Estevam <fabio.estevam@freescale.com>2014-05-14 22:55:03 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-05-28 23:36:21 +0400
commitb38cb7d2571197b56cefae8967f9db15c9361113 (patch)
tree5a5ea6abcfa86082753b9f2272a4dfe990ae1493 /arch/hexagon/Kconfig
parent81bd1eb7af751666ace2f1dadb0b0101401807cd (diff)
downloadlinux-b38cb7d2571197b56cefae8967f9db15c9361113.tar.xz
serial: imx: Disable new features of autobaud detection
Bit 7 of UCR3 is described in the i.MX reference manuals (with the exception of i.MX1) as follows: ADNIMP: Autobaud Detection Not Improved-. Disables new features of autobaud detection (See Baud Rate Automatic Detection Protocol, for more details). 0 Autobaud detection new features selected 1 Keep old autobaud detection mechanism The "new features" mechanism occasionally cause the receiver to get out of sync and continuously produce received characters of '\xff'. In order to reproduce the problem: $ stty -F /dev/ttymxc0 19200 - Change the terminal baudrate to 19200 - Type in the console and it should look good - Change the terminal baudrate back to 115200 - Type 'b' in the console, then a stream of garbage characters is seen. Also rename the bit definition as per the reference manual. Tested on mx6q, mx6dl, mx6solo and mx53. Based on a patch from Eric Nelson for U-boot. Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Tested-by: Eric Nelson <eric.nelson@boundarydevices.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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