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change(esp_pm): improve POWER_DOWN_TAGMEM_IN_LIGHT_SLEEP description

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wuzhenghui 2023-11-09 19:08:26 +08:00 committed by BOT
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components/esp_pm/Kconfig
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@ -96,18 +96,28 @@ menu "Power Management"
select PM_POWER_DOWN_TAGMEM_IN_LIGHT_SLEEP if ESP32S3_DATA_CACHE_16KB
default y
help
If enabled, the CPU will be powered down in light sleep. On esp32c3 soc, enabling this
option will consume 1.68 KB of internal RAM and will reduce sleep current consumption
by about 100 uA. On esp32s3 soc, enabling this option will consume 8.58 KB of internal
RAM and will reduce sleep current consumption by about 650 uA.
If enabled, the CPU will be powered down in light sleep, ESP chips supports saving and restoring
CPU's running context before and after light sleep, the feature provides applications with seamless
CPU powerdowned lightsleep without user awareness.
But this will takes up some internal memory. On esp32c3 soc, enabling this option will consume 1.68 KB
of internal RAM and will reduce sleep current consumption by about 100 uA. On esp32s3 soc, enabling this
option will consume 8.58 KB of internal RAM and will reduce sleep current consumption by about 650 uA.
config PM_POWER_DOWN_TAGMEM_IN_LIGHT_SLEEP
bool "Power down I/D-cache tag memory in light sleep"
bool "Restore I/D-cache tag memory after power down CPU light sleep"
depends on IDF_TARGET_ESP32S3 && PM_POWER_DOWN_CPU_IN_LIGHT_SLEEP
default y
help
If enabled, the I/D-cache tag memory will be retained in light sleep. Depending on the the
cache configuration, if this option is enabled, it will consume up to 9 KB of internal RAM.
Cache tag memory and CPU both belong to the CPU power domain. ESP chips supports saving and restoring
Cache tag memory before and after sleep, this feature supports accesses to the external memory that was
cached before sleep still be cached when the CPU wakes up from a powerdowned CPU lightsleep. This option
controls the restore method for Cache tag memory in lightsleep.
If this option is enabled, the I/D-cache tag memory will be backuped to the internal RAM before sleep and
restored upon wakeup. Depending on the the cache configuration, if this option is enabled, it will consume
up to 9 KB of internal RAM.
If this option is disabled, all cached data won't be kept after sleep, the DCache will be writeback before
sleep and invalid all cached data after sleep, all accesses to external memory(Flash/PSRAM) will be cache
missed after waking up, resulting in performance degradation due to increased memory accesses latency.
config PM_POWER_DOWN_PERIPHERAL_IN_LIGHT_SLEEP
bool "Power down Digital Peripheral in light sleep (EXPERIMENTAL)"