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 <ulrich.hecht+renesas@xxxxxxxxx> --- 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 2c45e79..9323735 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) -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html