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serial: serial-uclass: Add generic serial RX buffer support

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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>
This commit is contained in:
Stefan Roese
2017-08-16 17:37:16 +02:00
committed by Bin Meng
parent 7fded0ce0f
commit 3ca7a06afb
3 changed files with 70 additions and 3 deletions
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10
include/serial.h
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@ -148,10 +148,18 @@ struct dm_serial_ops {
/**
* struct serial_dev_priv - information about a device used by the uclass
*
* @sdev: stdio device attached to this uart
* @sdev: stdio device attached to this uart
*
* @buf: Pointer to the RX buffer
* @rd_ptr: Read pointer in the RX buffer
* @wr_ptr: Write pointer in the RX buffer
*/
struct serial_dev_priv {
struct stdio_dev *sdev;
char *buf;
int rd_ptr;
int wr_ptr;
};
/* Access the serial operations for a device */