Commit 637ba54f authored by Ludovic Desroches's avatar Ludovic Desroches Committed by Greg Kroah-Hartman

tty/serial: atmel: add comment for the ring buffer size macro

There is a macro named ATMEL_SERIAL_RINGSIZE which suggesting that it
corresponds to the real size of the ring buffer. Let warn people that
there is a factor of four since allocation size is
sizeof(struct atmel_uart_char) * ATMEL_SERIAL_RINGSIZE.
Signed-off-by: default avatarLudovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 00e8e658
...@@ -108,6 +108,12 @@ struct atmel_uart_char { ...@@ -108,6 +108,12 @@ struct atmel_uart_char {
u16 ch; u16 ch;
}; };
/*
* Be careful, the real size of the ring buffer is
* sizeof(atmel_uart_char) * ATMEL_SERIAL_RINGSIZE. It means that ring buffer
* can contain up to 1024 characters in PIO mode and up to 4096 characters in
* DMA mode.
*/
#define ATMEL_SERIAL_RINGSIZE 1024 #define ATMEL_SERIAL_RINGSIZE 1024
/* /*
......
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