May 2019 - Sound-open-firmware - mailman.alsa-project.org

[Sound-open-firmware] What is the correct loopback configuration for ASoC machine driver DAI links?
by Thomas Preston 30 May '19

30 May '19

Hi, I have a question about configuring a physical loopback on a custom board for the Intel Skylake platform driver. I have also asked on freenode/#alsa-dev but they directed me here. We have the following physical SSP layout: A2B axillary audio + SSP0 Tx (connected to SSP5 Rx, for debug) + SSP0 Rx Main speaker output + loopback from A2B + SSP5 Tx + SSP5 Rx (connected to SSP0 Tx) We have a board-level hardware loopback where the output signals and clock (slave) on SSP0 are connected to the input signals and clock (master) on SSP5. I'm trying to configure the DAI links in the machine driver so that they link against SSP0 Pin CPU DAI correctly but I have three problematic configurations: 1. Separate BE DAI links for SSP5 playback and capture, linking against the same Skylake CPU DAI "SSP5 Tx". This crashes the kernel with a NULL pointer dereference (I'm looking into this). Presumably this is an invalid configuration because I have multiple DAI links linking against one CPU DAI. See machine1.c 2. One BE DAI link for SSP5 playback + capture, linking against the same Skylake CPU DAI. This silences my SSP5 Tx main audio output (which appears to be muted) when I try to arecord on the SSP5 Rx A2B debug loopback. The recording is a perfect copy of SSP0 Tx so the loopback part works. I can recover by restarting my whole audio stack. See machine2.c 3. Separate BE DAI links for SSP playback and loopback, linking against a separated SSP5 Skylake CPU DAI (SSP5 Pin with ssp5 Tx, SSP5 Pin Loopback with ssp5 Rx). This configuration works but requires a modification to the Skylake platform driver - which I'd rather avoid. See machine3.c, skylake.diff Configuration 2 is closest to what I want, and configuration 3 is my work-around for now. What is the correct way to link CPU DAIs for this kind of loopback? I have attached example code. Many thanks, Thomas

2 3

[Sound-open-firmware] Commits in SOF
by Daniel Baluta 29 May '19

29 May '19

Hello all, I have few comments about commits in SOF FW which I think might improve the review quality. 1) I've seen commit messages that do not explain WHY the change is needed but mostly saying WHAT the change is doing. Explaining WHAT the change is doing is good when the code is fairly complicated. Anyhow, I would prefer to see more of WHY do we need that change. Lets try to keep this in mind. 2) Commit messages do not contain a verb. Commits should be seen as actions thus should contain a verb. More than that we should use imperative mood. Not added, fixed, etc but Add, Fix, etc! 3) Capitalize the subject line First letter from commit subject after the subsystem tag should be capital. e.g. buffer: add new interface -> buffer: Add new interface I think we should turn our attention to: https://chris.beams.io/posts/git-commit/#seven-rules thanks, Daniel.

4 4

[Sound-open-firmware] Initial support for i.MX8 platform
by Daniel Baluta 28 May '19

28 May '19

Hi Liam / Pierre, I've sent initial patches for i.MX8 FW [1]. There are still a lot of things to be done but I will to solve them step by step. Appreciate any review and hope to get at least the basic support accepted then build on top of that. Next steps: 1) Add CI support to compile for imx architecture (both FW/Linux) 2) Send Linux kernel side patches. Can you guide me on how to deal with 1)? thanks, Daniel. [1] https://github.com/thesofproject/sof/pull/1457

5 9

[Sound-open-firmware] Linux Lund Conf presentation: Sound Open Firmware on i.MX8
by Daniel Baluta 23 May '19

23 May '19

Hi Liam / Pierre, This Friday I will give a talk about enabling SOF on i.MX8 [1] at Linux Lund Conf [2] I adapted some pictures from Liam's ELCE presentation. Let me know if that's OK with you. Any feedback is welcome! thanks, Daniel. [1] https://drive.google.com/open?id=1wpJTQPTxDaYma5MtyRixyeMUSgQiVbrC [2] https://lundlinuxcon.org/?page=current

5 7

[Sound-open-firmware] SOF Zephyr and ARM support on STM32
by Calvin AGENEAU 23 May '19

23 May '19

Hello SOF subscribers, I am currently in my 5th year of Master's degree as an intern at ST Microelectronics and my internship subject is the porting of SOF to the latest STM32 card. I come to you because I couldn't find information about the implementation of SOF in Zephyr and about ARM architecture, I only found information for Xtensa and Baytrail in the official documentation. Can someone gives me advices ? Best Regards, Calvin Ageneau??

3 3

[Sound-open-firmware] SOF Zephyr and ARM support on STM32
by Calvin AGENEAU 23 May '19

23 May '19

Hello SOF subscribers, I am currently in my 5th year of Master's degree as an intern at ST Microelectronics and my internship subject is the porting of SOF to the latest STM32 card. I come to you because I couldn't find information about the implementation of SOF in Zephyr and about ARM architecture, I only found information for Xtensa and Baytrail in the official documentation. Can someone gives me advices ? Best Regards, Calvin Ageneau?

1 0

[Sound-open-firmware] BYT; why is my logger not working?
by Guennadi Liakhovetski 08 May '19

08 May '19

Hi, Since noone else is reporting thic including CI, I assume it's me doing something wrong. sof-logger on minnow board exits immediately for me with no output. Could someone confirm or double-check? Thanks Guennadi

5 7