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Switch to a voluntary kernel preemption.

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The respeaker mic hats and possibly (many) others are using the
x-powers ac108 adc chip however the driver of this chip is not
compatible with 64bit PREEMPT kernels crashing the drivers with
"BUG: scheduling while atomic" spinlock issues.

PREEMPT is used for low latency desktops
PREEMPT_NONE is used for servers

As we are not a (low-latency needed) desktop however not a server
as well, the middle ground actually works perfectly fine with
the benefit of having a more stable respeaker driver.

This accounts for ALL different respeaker HATs except the 2-mic
as that one is based on the WM8960 chip which is actually already
supported mainline if you want anyway.
This commit is contained in:
j1nx 2022-02-09 14:15:41 +01:00
parent f19fafe216
commit 470fd58d98
1 changed files with 3 additions and 0 deletions
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3
buildroot-external/board/raspberrypi/kernel.config
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@ -4,5 +4,8 @@ CONFIG_SND_SOC_TAS5086=m
# CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE is not set # CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE is not set
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
CONFIG_PREEMPT_VOLUNTARY=y
# CONFIG_PREEMPT is not set
CONFIG_ZRAM=y CONFIG_ZRAM=y
CONFIG_ZSMALLOC=y CONFIG_ZSMALLOC=y