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| author | Ulrich Hecht <ulrich.hecht+renesas@gmail.com> | 2018-04-04 17:48:51 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-23 10:08:18 +0200 |
| commit | 63ba1e00f178a4483b473489cadc4eb52a77df2a (patch) | |
| tree | 0c5c157f62ea8a446807e9d4a9d217085f670d9f /drivers/tty/serial/sh-sci.h | |
| parent | serial: sh-sci: Add support for dynamic instances (diff) | |
| download | linux-63ba1e00f178a4483b473489cadc4eb52a77df2a.tar.xz linux-63ba1e00f178a4483b473489cadc4eb52a77df2a.zip | |
serial: sh-sci: Support for HSCIF RX sampling point adjustment
HSCIF has facilities that allow moving the RX sampling point by between
-8 and 7 sampling cycles (one sampling cycles equals 1/15 of a bit
by default) to improve the error margin in case of slightly mismatched
bit rates between sender and receiver.
This patch tries to determine if shifting the sampling point can improve
the error margin and will enable it if so.
Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/sh-sci.h')
| -rw-r--r-- | drivers/tty/serial/sh-sci.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/tty/serial/sh-sci.h b/drivers/tty/serial/sh-sci.h index a5f792fd48d9..0b9e804e61a9 100644 --- a/drivers/tty/serial/sh-sci.h +++ b/drivers/tty/serial/sh-sci.h @@ -130,6 +130,10 @@ enum { /* HSSRR HSCIF */ #define HSCIF_SRE BIT(15) /* Sampling Rate Register Enable */ +#define HSCIF_SRDE BIT(14) /* Sampling Point Register Enable */ + +#define HSCIF_SRHP_SHIFT 8 +#define HSCIF_SRHP_MASK 0x0f00 /* SCPCR (Serial Port Control Register), SCIFA/SCIFB only */ #define SCPCR_RTSC BIT(4) /* Serial Port RTS# Pin / Output Pin */ |