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ASoC: qcom: lpass-platform: Use SNDRV_DMA_TYPE_NONCOHERENT page allocation
authorJudy Hsiao <judyhsiao@chromium.org>
Thu, 8 Dec 2022 08:42:00 +0000 (08:42 +0000)
committerMark Brown <broonie@kernel.org>
Wed, 25 Jan 2023 14:24:02 +0000 (14:24 +0000)
commit01270f905eea786f418cbc2040f7a52b969ef377
tree2f9670629df3af574d27627cb12e6df1d7d2d21d
parent3a14adc51605452fdf1c009cc3333c7e399821d9
ASoC: qcom: lpass-platform: Use SNDRV_DMA_TYPE_NONCOHERENT page allocation

Replace SNDRV_DMA_TYPE_DEV by SNDRV_DMA_TYPE_NONCOHERENT for pcm
buffer allocation. We measured about 18x performance improvement
when accessing the snd_pcm_mmap() buffer from userspace.

Eg: aarch64 with internal speaker
==
SNDRV_DMA_TYPE_DEV
    frames_per_second=66.4557M/s
    max_time_per_4096_frames=106.094u
    time_per_4096_frames=61.6351us

SNDRV_DMA_TYPE_NONCOHERENT
    frames_per_second=1028.58M/s
    max_time_per_4096_frames=20.312u
    time_per_4096_frames=3.98221us

Signed-off-by: Judy Hsiao <judyhsiao@chromium.org>
Link: https://lore.kernel.org/r/20221208084200.2136311-1-judyhsiao@chromium.org
Signed-off-by: Mark Brown <broonie@kernel.org>
sound/soc/qcom/lpass-platform.c