From: Peter Hurley [mailto:peter@xxxxxxxxxxxxxxxxxx] 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 ��.n��������+%������w��{.n�����{��ǫ����{ay� ʇڙ���f���h������_�(�階�ݢj"��������G����?���&��
