fwk: 16-inch: add GPU_PWR_LEVEL control

To prevent GPU power spikes before the OS driver is
loaded, control GPU_PWR_LEVEL GPIO during power-on:

- At 0x3E07 (non-ACPI/PMF update), force GPU_PWR_LEVEL
low to limit GPU power.
- At 0x3E10 (ACPI driver ready), keep GPU_PWR_LEVEL low
for an additional 60s, then release (pull high) once OS is stable.

This ensures NV GPU systems can successfully
boot to OS on AC-only with 100W adapter.

BRANCH=fwk-tulip-29169
BUG=https://app.clickup.com/t/86euq09pq
TEST=Verified AC-only boot with 100W adapter reaches OS with NV GPU on Tulip
Used gpucfg console command to confirm GPIO2 (GPU_PWR_LEVEL) state:
 - At HC 0x3E07: GPIO2 = Low
 - At HC 0x3E10 + 60s: GPIO2 = High

Signed-off-by: johnwc_yeh <JohnWC_Yeh@compal.com>

Author: JohnWC-Yeh

zephyr/program/framework/include/lotus/gpu.h

@@ -8,6 +8,7 @@
 
 #include <gpu_configuration.h>
 #include "common_cpu_power.h"
+#include "throttle_ap.h"
 
 
 bool gpu_power_enable(void);
@@ -52,4 +53,12 @@ void gpu_set_pd_state(void);
 
 void gpu_update_pd_vdm(int controller, int port, uint8_t *data, int len);
 
+/**
+ * Set the NV GPU throttle
+ *
+ * @param level    Level of throttling desired
+ * @param delay    Delay (in seconds) before applying the throttle.
+ */
+void set_nv_gpu_throttle(enum throttle_level level, int delay);
+
 #endif /* __BOARD_GPU_H__ */

zephyr/program/framework/lotus/src/cpu_power.c

@@ -475,6 +475,9 @@ void update_soc_power_limit(bool force_update, bool force_no_adapter)
 		set_gpu_gpio(GPIO_FUNC_ACDC, 1);
 #endif
 
+	if (force_update)
+		set_nv_gpu_throttle(THROTTLE_ON, 0);
+
 	if (mode_ctl)
 		mode = mode_ctl;
 

zephyr/program/framework/lotus/src/gpu.c

@@ -43,6 +43,7 @@ static int gpu_id_0;
 static int gpu_id_1;
 static int switch_status;
 static enum gpu_pd pd_type = PD_TYPE_INVALID;
+static bool curr_throttle_level;
 
 bool gpu_power_enable(void)
 {
@@ -366,3 +367,31 @@ void gpu_update_pd_vdm(int controller, int port, uint8_t *data, int len)
 		}
 	}
 }
+
+static void nv_gpu_throttle_apply(void)
+{
+	if (curr_throttle_level == THROTTLE_ON) {
+		if (get_gpu_gpio(GPIO_FUNC_GPU_PWR_LEVEL)) {
+			set_gpu_gpio(GPIO_FUNC_GPU_PWR_LEVEL, 0);
+		}
+	} else {
+		if (!get_gpu_gpio(GPIO_FUNC_GPU_PWR_LEVEL)) {
+			set_gpu_gpio(GPIO_FUNC_GPU_PWR_LEVEL, 1);
+		}
+	}
+}
+DECLARE_DEFERRED(nv_gpu_throttle_apply);
+
+void set_nv_gpu_throttle(enum throttle_level level, int delay)
+{
+	/* Cancel pending deferred call. */
+	hook_call_deferred(&nv_gpu_throttle_apply_data, -1);
+
+	curr_throttle_level = level;
+
+	if (delay == 0) {
+		nv_gpu_throttle_apply();
+	} else {
+		hook_call_deferred(&nv_gpu_throttle_apply_data, delay * SECOND);
+	}
+}

zephyr/program/framework/src/board_host_command.c

@@ -70,6 +70,8 @@ static void sci_enable(void)
 #ifdef CONFIG_PLATFORM_EC_FRAMEWORK_LAPTOP_16
 		/* hook_call_deferred(&gpu_typec_detect_data, 500 * MSEC); */
 		gpu_typec_detect();
+
+		set_nv_gpu_throttle(THROTTLE_OFF, 60);
 #endif
 	} else
 		hook_call_deferred(&sci_enable_data, 250 * MSEC);