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| author | Marek Vasut <marek.vasut+renesas@gmail.com> | 2020-05-09 22:30:05 +0200 |
|---|---|---|
| committer | Marek Vasut <marek.vasut+renesas@gmail.com> | 2020-09-01 14:46:41 +0200 |
| commit | f5ba5c90d4b9c4d691a62eaca47dc095eefba8b1 (patch) | |
| tree | 116f369fa019660eeda65f8e03e63c29797c0b29 | |
| parent | 23e333a5c083a000d0cabc53f7c0d261bae9e5ca (diff) | |
| download | u-boot-f5ba5c90d4b9c4d691a62eaca47dc095eefba8b1.tar.gz | |
serial: sh: Improve FIFO empty check on RX
If the SCIF is receiving data quickly enough, it may happen that the
SCxSR_RDxF flag is cleared in sh_serial_getc_generic(), while the
FIFO still contains data. If that happens, the serial_getc_check()
reports no data in the FIFO as the flag is no longer set. Add one
more check, if the SCxSR_RDxF is not set, read out the FIFO level
and if there are still characters in the FIFO, permit reading them
out.
Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
| -rw-r--r-- | drivers/serial/serial_sh.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/serial/serial_sh.c b/drivers/serial/serial_sh.c index 13b179f03d..e27d256574 100644 --- a/drivers/serial/serial_sh.c +++ b/drivers/serial/serial_sh.c @@ -116,7 +116,10 @@ static int serial_getc_check(struct uart_port *port) handle_error(port); if (sci_in(port, SCLSR) & SCxSR_ORER(port)) handle_error(port); - return status & (SCIF_DR | SCxSR_RDxF(port)); + status &= (SCIF_DR | SCxSR_RDxF(port)); + if (status) + return status; + return scif_rxfill(port); } static int sh_serial_getc_generic(struct uart_port *port) |