Re: [RFC PATCH 4/6] serio: serport: add support for buffered write and receive

[Rob Herring]

On Fri, Aug 26, 2016 at 3:12 PM, Pavel Machek <pavel@xxxxxx> wrote:
> Hi!
>
>> @@ -133,26 +133,29 @@ static void serport_ldisc_receive(struct tty_struct *tty, const unsigned char *c
>>       if (!test_bit(SERPORT_ACTIVE, &serport->flags))
>>               goto out;
>>
>> -     for (i = 0; i < count; i++) {
>> -             if (fp) {
>> -                     switch (fp[i]) {
>> -                     case TTY_FRAME:
>> -                             ch_flags = SERIO_FRAME;
>> -                             break;
>> -
>> -                     case TTY_PARITY:
>> -                             ch_flags = SERIO_PARITY;
>> -                             break;
>> -
>> -                     default:
>> -                             ch_flags = 0;
>> -                             break;
>> +     if (serio_buffered_mode_enabled(serport->serio)) {
>> +             serio_receive_buf(serport->serio, cp, count);
>
> Elsewhere:
> +       /* Use buffer receive if the driver provides a callback */
> +       if (drv->receive_buf)
> +               set_bit(SERIO_MODE_BUFFERED, &drv->flags);
>
> Could we use if (drv->receive_buf) above directly, and not require the
> bitfield?

I'm allowing for allowing drivers to provide both functions and be
able to switch between them. However, I didn't provide any mechanism
to do so yet.

Rob