serial: serial-uclass: Add generic serial RX buffer support
Pasting longer lines into the U-Boot console prompt sometimes leads to
characters missing. One problem here is the small 16-byte FIFO of the
legacy NS16550 UART, e.g. on x86 platforms.
This patch now introduces a Kconfig option to enable RX buffer support
for all DM based serial drivers. With this option enabled, I was
able paste really long lines into the U-Boot console, without any
characters missing.
Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Bin Meng <bmeng.cn@gmail.com>
Cc: Tom Rini <trini@konsulko.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 1c2c5d6..aeed538 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -64,6 +64,21 @@
implements serial_putc() etc. The uclass interface is
defined in include/serial.h.
+config SERIAL_RX_BUFFER
+ bool "Enable RX buffer for serial input"
+ depends on DM_SERIAL
+ help
+ Enable RX buffer support for the serial driver. This enables
+ pasting longer strings, even when the RX FIFO of the UART is
+ not big enough (e.g. 16 bytes on the normal NS16550).
+
+config SERIAL_RX_BUFFER_SIZE
+ int "RX buffer size"
+ depends on SERIAL_RX_BUFFER
+ default 256
+ help
+ The size of the RX buffer (needs to be power of 2)
+
config SPL_DM_SERIAL
bool "Enable Driver Model for serial drivers in SPL"
depends on DM_SERIAL