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authorPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>2020-01-10 16:25:25 -0600
committerMark Brown <broonie@kernel.org>2020-01-13 15:00:16 +0000
commitefb6f3159e874f09992b7318cea12e8e27e8389b (patch)
tree9d04a4d5f4fb4c956119ffba6814b0f19c1d4487 /kernel/utsname.c
parentASoC: SOF: fix PCM playback through ALSA OSS emulation (diff)
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ASoC: soc-acpi: add _ADR-based link descriptors
For SoundWire support, we added a 'link_mask' to describe the PCB hardware layout. This helped form a signature that can be used as a first-order way of detecting the hardware and selecting the machine driver. The concept of link_mask is however not enough. Some BIOS enable all links, even when there are no devices physically connected. We can also see variations with multiple devices attached on one link, or different types of devices connected on the same link. To accurately represent the hardware, we need to build static tables where each link exposes a list of expected devices represented by the 64-bit _ADR field (which uniquely identifies each device). The new 'links' field is optional when the link_mask is sufficient to represent a platform in a unique way. The existing mechanism to support I2C devices is left as is, it'd be too invasive to change the existing support for _HID and the notion of link is not relevant either. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Bard liao <yung-chuan.liao@linux.intel.com> Link: https://lore.kernel.org/r/20200110222530.30303-2-pierre-louis.bossart@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
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