On 4/24/18 9:49 PM, Vinod Koul wrote:
On Tue, Apr 24, 2018 at 06:40:54PM -0500, Pierre-Louis Bossart wrote:
On 4/24/18 4:06 AM, Vinod Koul wrote:
On Mon, Apr 23, 2018 at 08:33:08AM -0500, Pierre-Louis Bossart wrote:
On 4/21/18 10:58 AM, Vinod Koul wrote:
On Sat, Apr 21, 2018 at 06:59:49AM -0700, Pierre-Louis Bossart wrote:
+/**
+ * snd_soc_dai_set_sdw_stream() - Configures a DAI for SDW stream operation
+ * @dai: DAI
+ * @stream: STREAM
+ * @direction: Stream direction(Playback/Capture)
+ * SoundWire subsystem doesn't have a notion of direction and we reuse
+ * the ASoC stream direction to configure sink/source ports.
+ * Playback maps to source on the TX and sink on Rx. Vice-versa for Capture.
this is just confusing...
This should be something like
"use Playback for source ports and Capture for sink ports".
Source port on ...? This is also confusing to me!
For playback there are two ports, one on transmitter aka
TX and one on receiver aka RX. For Tx we use source port, and Rx uses sink
ports. I should probably add port to make people really figure out we are
talking about ports!
So:
Playback maps to source port on the TX and sink port on Rx. Vice-versa for Capture.
Do you agree to above statement?
No. Source port and TX are redundant definitions, and your wording isn't
clear: is the PLAYBACK/CAPTURE qualifier for the stream or the DAI used by
the stream?
Yes they are redundant, will update. PLAYBACK/CAPTURE qualifier is for stream.
Let me try again.
let's say in point-to-point mode you have dai1 as the source and dai2 as the
sink.
Which sequence are the higher layers supposed to use:
a.
snd_soc_dai_set_sdw_stream(dai1, stream, PLAYBACK);
snd_soc_dai_set_sdw_stream(dai2, stream, PLAYBACK);
b.
snd_soc_dai_set_sdw_stream(dai1, stream, PLAYBACK);
snd_soc_dai_set_sdw_stream(dai2, stream, CAPTURE);
I believe this.
For clarity, did you mean b) ?
If yes, Playback == Source and Capture == sink.
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