one char delay

one char delay

[Oleksij Rempel]

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Hello all,

i do some hobby work on porting linux to Alpscale asm9260 SoC and have
fallowing problem with serial driver. May be you can help me.

- each RX char will be send to the console only after next chart is
entered. For example:
Typed: dmesg
Displ:  dmesg
- all chars are immediately send with uart_insert_char() and
tty_flip_buffer_push() to the core. So this delay is not insight of
driver. I assume, i miss some flag or initialization.

The driver was initially based on atmel_serial.c and ported by Alpscale
to 2.4.28.
I reused this code.. which is working with this issue. Here is the driver:
https://github.com/olerem/linux-2.6/blob/arm_9260-2014.07.29/drivers/tty/serial/asm9260_serial.c

-- 
Regards,
Oleksij


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[SOLVED] Re: one char delay

[Oleksij Rempel]

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Am 14.08.2014 um 10:50 schrieb Oleksij Rempel:
> Hello all,
> 
> i do some hobby work on porting linux to Alpscale asm9260 SoC and have
> fallowing problem with serial driver. May be you can help me.
> 
> - each RX char will be send to the console only after next chart is
> entered. For example:
> Typed: dmesg
> Displ:  dmesg
> - all chars are immediately send with uart_insert_char() and
> tty_flip_buffer_push() to the core. So this delay is not insight of
> driver. I assume, i miss some flag or initialization.
> 
> The driver was initially based on atmel_serial.c and ported by Alpscale
> to 2.4.28.
> I reused this code.. which is working with this issue. Here is the driver:
> https://github.com/olerem/linux-2.6/blob/arm_9260-2014.07.29/drivers/tty/serial/asm9260_serial.c
> 

Never mind.
Problem is solved.

It was buggy driver code. Insight of start_tx some faulty check was not
allowing transmit buffers.

-- 
Regards,
Oleksij


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