Re: SH7722 serial scif

[Michael Trimarchi <trimarchimichael@yahoo.it>]

Hi,

...


> Ok, that's interesting. There are a couple things to consider here:
> 
>     - startup/shutdown both set and clear the RX and TX IRQ enable
>       bits
>     - the base SCSCR initialization is maintained across the lifetime
>       of the port, and is directly manipulated by the termios value.
> 
> We need the initialization in the set_termios path for things like the
> system console, which can be suspended/resumed, as well as handling
> rate changes directly (not related to the frequency notifier).
> 
> Given that, moving this out to the startup/shutdown path is definitely
> not what we want to do, but we do need to figure out what your SCSCR
> register state is at the time of startup and shutdown. There are a couple
> of possibilities:
> 
>     - IRQ not properly acked and cleared at shutdown time, despite
>       the TX/RX bits being cleared.
>     - Some bit setting in the SCSCR_INIT definition for your platform
>       that we need to be more careful in handling.
> 
> If we look at the setting for 7722, it's the usual mix of TE/RE/REIE and
> nothing particularly exotic, so we can probably just swallow these up in
> the sci_start_tx/rx()/sci_stop_tx/rx() pairs, and that should
> subsequently get your SCSCR value pretty much back to 0 at shutdown time.

After revert my code, and take a look to the SCSCR register before
open and shutdown, this is the result. 

I found a SCSCR equal to 0x38 after and before, so the bit are not cleared but if I do an sci_out of 0
to the register, all seems to be ok.

It is very strange, it seems the SCSCR status does't change
after the sci_stop_tx e sci_stop_rx


Any idea?

Regards Michael

__________________________________________________
Do You Yahoo!?
Poco spazio e tanto spam? Yahoo! Mail ti protegge dallo spam e ti da tanto spazio gratuito per i tuoi file e i messaggi 
http://mail.yahoo.it