From 32580c025fdaf23c9396690e0f282a9fbb4c593b Mon Sep 17 00:00:00 2001 From: Ulrich Hecht Date: Thu, 2 Feb 2017 18:10:15 +0100 Subject: [PATCH] serial: sh-sci: consider DR (data ready) bit adequately To allow operation with a higher RX FIFO interrupt threshold in PIO mode, it is necessary to consider the DR bit ("FIFO not full, but no data received for 1.5 frames") as an indicator that data can be read. Otherwise the driver will let data rot in the FIFO until the threshold is reached. Signed-off-by: Ulrich Hecht Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/sh-sci.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/sh-sci.h b/drivers/tty/serial/sh-sci.h index 30b6d67867e7f..971b2ab088d84 100644 --- a/drivers/tty/serial/sh-sci.h +++ b/drivers/tty/serial/sh-sci.h @@ -151,7 +151,7 @@ enum { #define SCCKS_XIN BIT(14) /* SC_CLK uses bus clock (1) or SCIF_CLK (0) */ #define SCxSR_TEND(port) (((port)->type == PORT_SCI) ? SCI_TEND : SCIF_TEND) -#define SCxSR_RDxF(port) (((port)->type == PORT_SCI) ? SCI_RDRF : SCIF_RDF) +#define SCxSR_RDxF(port) (((port)->type == PORT_SCI) ? SCI_RDRF : SCIF_DR | SCIF_RDF) #define SCxSR_TDxE(port) (((port)->type == PORT_SCI) ? SCI_TDRE : SCIF_TDFE) #define SCxSR_FER(port) (((port)->type == PORT_SCI) ? SCI_FER : SCIF_FER) #define SCxSR_PER(port) (((port)->type == PORT_SCI) ? SCI_PER : SCIF_PER) -- 2.39.5