diff --git a/meta-facebook/meta-yosemite4/recipes-yosemite4/plat-svc/files/yosemite4-early-sys-init b/meta-facebook/meta-yosemite4/recipes-yosemite4/plat-svc/files/yosemite4-early-sys-init
index 7f02ad2..9766faf 100644
--- a/meta-facebook/meta-yosemite4/recipes-yosemite4/plat-svc/files/yosemite4-early-sys-init
+++ b/meta-facebook/meta-yosemite4/recipes-yosemite4/plat-svc/files/yosemite4-early-sys-init
@@ -15,6 +15,23 @@
     fi
 }
 
+set_all_fan_pwm_80_percent() {
+    # 255 * 80% = 204
+    pwm_value=204
+
+    for pwm_node in /sys/bus/i2c/devices/*/hwmon/*/pwm*
+    do
+        if [[ ! "$pwm_node" =~ _enable ]]; then
+            curr_pwm=$(cat "$pwm_node")
+
+            # Set PWM to 80% if current PWM is higher than 80%.
+            if [[ "$curr_pwm" -ge "$pwm_value" ]]; then
+              echo $pwm_value > "$pwm_node"
+            fi
+        fi
+    done
+}
+
 set_sd_bic_interface_to_i3c()
 {
     for host_bus in $(seq 0 7);
@@ -60,6 +77,9 @@
 # Enable all fan input as early as possible
 enable_all_fan_input
 
+# Set all fan PWM to 80%
+set_all_fan_pwm_80_percent
+
 if [ -n "$is_nuvoton_board" ]
 then
     # Set interface to SD BIC to I3C for Nuvoton BMC