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[wifi] Sync output_power with PHY max TX power to prevent brownout (#14118)

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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Jonathan Swoboda
2026-02-19 15:14:48 -05:00
parent 0fc09462ff
commit f412ab4f8b
1 changed files with 8 additions and 0 deletions
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8
esphome/components/wifi/__init__.py
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@@ -1,4 +1,5 @@
import logging
import math
from esphome import automation
from esphome.automation import Condition
@@ -493,6 +494,13 @@ async def to_code(config):
cg.add(var.set_passive_scan(True))
if CONF_OUTPUT_POWER in config:
cg.add(var.set_output_power(config[CONF_OUTPUT_POWER]))
if CORE.is_esp32:
# Set PHY max TX power to match output_power so calibration also uses
# reduced power. This prevents brownout during PHY init on marginal
# power supplies, which is critical for OTA updates with rollback enabled.
# Kconfig range is 10-20, ESPHome allows 8.5-20.5
phy_tx_power = max(10, min(20, math.ceil(config[CONF_OUTPUT_POWER])))
add_idf_sdkconfig_option("CONFIG_ESP_PHY_MAX_WIFI_TX_POWER", phy_tx_power)
# enable_on_boot defaults to true in C++ - only set if false
if not config[CONF_ENABLE_ON_BOOT]:
cg.add(var.set_enable_on_boot(False))