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Linux Events: Linux Plumbers Conference and Audio Miniconf

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Linux
  • Linux Plumbers Conference: Linux Plumbers Conference 2019 videos are now available

    Following up on our previous post, and as many of you have already noticed, the LPC 2019 videos have now been uploaded to our YouTube channel.

    Over the coming days the LPC committee will be updating the 2019 site to incorporate links to the videos. At the same time, we will be getting ready to launch the 2020 site as well.

  • Audio Miniconf 2019 Report

    Daniel Baluta then started some discussion of topics related to Sound Open Firmware (slides). The first was issues with loading firmware before the filesystems are ready, we agreed that this can be resolved through the use of the _nowait() APIs. More difficult was resolving how to deal with card initialization. Currently the only complete in-tree users are x86 based so have to deal with the problems with the incomplete firmware descriptions provided by ACPI, there’s nothing standards based like we have for device tree systems, and assumptions about that have crept into how the code works. It’s going to take a bunch of work to implement but we came to a reasonable understanding of how this should work, with the DSP represented as a device in the device tree and bound to the card like any other component.

    Continuing on the DSP theme Patrick Lai then lead a discussion of gapless playback with format switches, we agreed that allowing set_params() to be called multiple times on a single stream when the driver could support it was the most sensible approach. The topic of associating controls with PCM streams was also discussed, there are some old APIs for this but so little hardware has implemented them that we agreed that a convention for control names based on the stream names was probably easier to support with current userspace software.

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