Hi Raymond,
>
> > > }
> > >
> > > + if (is_haswell_plus(codec)) {
> > > + if (acomp && acomp->ops && acomp->ops->set_ncts)
> > > + acomp->ops->set_ncts(acomp->dev, per_pin-
> > >pin_nid - 4,
> >
> > Please describe more how "pin_nid - 4" is supposed to work. Also...
>
> OK, I see.
>
> >
> > > + 0, runtime->rate);
> >
> > ... this implies that no MST support included?
>
> We will support MST later. Currently I just add the
> interface to support MST, but not implementing it.
Refer to DCN HDA040-A
Multi-stream over Single Display Port
Can the driver use subdevices for those display port support multi streaming ?
[Libin] What do you mean subdevice here,
using a struct device to represent a dev_entry or an int type?
The specification allow up to 64 device entries
This mean the number of subdevices is equal to the device list length
More than one audio output /converters can be connected to the multi stream
displayport pin widget but different device entry while only one audio output
can be dynamically allocated to other HDMI pin widget
[Libin] Yes, Pin widget can have multiple device entry and connecting different
converters. The audio output will be based on device entry.
7.3.3.42 Device Select
For Digital Display Pin Widget that is multi stream capable, the Device Select
control determines which Device Entry is currently selected and accessible by
the Pin Widget verbs which are controlling the sink device operations. This
control verb is only required if it is a Digital Display Pin Widget and multi
stream capable.
The index is in relation to the Device List associated with the widget. The
index is a zero-based offset into the Device List. Once the Device Entry is
selected by the Set index, all subsequent Pin Widget verbs controlling the sink
device operations will be directed to the selected Device Entry, until the
Device Select verb get updated with a new value.
Device Entry: Indicate the index of Device Entry (0 63) which the UR bit of is
generated for a multi stream capable Digital Display Pin Widget. Not valid for
non Digital Display Pin Widget or Digital Display Pin Widget that is not multi
stream capable
Device List Length is a 0 based integer value indicating the number of sink
device that a multi stream capable Digital Display Pin Widget can support. If
Device List Length is value is 0, there is only one sink device connection
possible indicating the Pin Widget is not multi stream capable, and there is no
Device Select control (see Section 7.3.3.42). If the Device List Length value
is 1 – 63, it indicates the Pin Widget is multi stream capable, and 2 – 64
Device Entries are supported in the Pin Widget.
>
Regards,
Libin
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