From: Peter Hurley [mailto:pe...@hurleysoftware.com]
Sent: Wednesday, July 22, 2015 3:39 PM
>> + /* Writing to LCR may cause BUSY interrupt before we
>> + * register the IRQ line.
>> + * Currently autoconf() uses several writes to LCR.
>> + * In order to avoid calling to autoconf() always add
>> + * following flag.
>> + */
>> + p->flags |= UPF_FIXED_TYPE;
>
> Why only for devicetree DW8250's? Don't all DW8250's have this LCR "feature"?
>
Yes, all DW8250 got this "feature" i.e. busy functionality.
> And what port type does this id DW8250's as, PORT_8250? Except with fifos,
> autoflow control, dma, etc.?
The only thing that DW8250 is not fully 16550 compatibility is this busy
functionality feature.
This feature means that a serial transfer is in progress.
It is indicated by special identification in IIR, and raised when LCR is
written while device is busy.
> If the port type is being fixed, then please fix it to a new port type.
As an extension to 16550 type is not fixed.
Seem that I need to rethink on this.
I will remove this commit from v2 patch set till I will be sure what is the
right thing to do.
Noam
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