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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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4ff028f6c1
The LPASS hardware allows configuring the MI2S SD lines to use when playing/recording audio. However, at the moment the lpass-cpu driver has SD0 hard-coded for mono/stereo (or additional fixed SD lines for more channels). For weird reasons there seems to be hardware that uses one of the other SD lines for mono/stereo. For example, some Samsung devices use an external Speaker amplifier connected to Quaternary MI2S. For some reason, the SD line for audio playback was connected to SD1 rather than SD0. (I have no idea why...) At the moment, the lpass-cpu driver cannot be configured to work for the Speaker on these devices. The q6afe driver already allows configuring the MI2S SD lines through the "qcom,sd-lines" device tree property, but this works only when routing audio through the ADSP. This commit adds a very similar configuration for the lpass-cpu driver. It is now possible to add additional subnodes to the lpass device in the device tree, to configure the SD lines for playback and/or capture. E.g. for the Samsung devices mentioned above: &lpass { dai@3 { reg = <MI2S_QUATERNARY>; qcom,playback-sd-lines = <1>; }; }; qcom,playback/capture-sd-lines takes a list of SD lines (0-3) in the same format as the q6afe driver. (The difference here is that q6afe has separate DAIs for playback/capture, while lpass-cpu has one for both...) For backwards compatibility with older device trees, the lpass-cpu driver defaults to LPAIF_I2SCTL_MODE_8CH if the subnode for a DAI is missing. This is equivalent to the previous behavior: Up to 8 channels can be configured, and SD0/QUAT01 will be chosen when setting up a stream with fewer channels. This allows the speaker to work on Samsung MSM8916 devices that use an external speaker amplifier. Signed-off-by: Stephan Gerhold <stephan@gerhold.net> Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20200425184657.121991-2-stephan@gerhold.net Signed-off-by: Mark Brown <broonie@kernel.org> |
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.. | ||
qdsp6 | ||
apq8016_sbc.c | ||
apq8096.c | ||
common.c | ||
common.h | ||
Kconfig | ||
lpass-apq8016.c | ||
lpass-cpu.c | ||
lpass-ipq806x.c | ||
lpass-lpaif-reg.h | ||
lpass-platform.c | ||
lpass.h | ||
Makefile | ||
sdm845.c | ||
storm.c |