[PATCH] platform/x86: asus-armoury: Add power limits for ROG Strix SCAR 16 (G635LX)

[Avi Fenesh]

Add the AC and DC power limit definitions for the ASUS ROG Strix SCAR 16
2025 (G635LX), enabling the nv_tgp, nv_dynamic_boost and ppt_pl*_* tuning
attributes on this model. Without an entry in the power_limits table the
attributes are not exposed (has_valid_limit() returns false) and the
firmware power knobs cannot be controlled.

The G635LX ships an NVIDIA RTX 5090 Laptop GPU (150 W base TGP + 25 W
Dynamic Boost = 175 W max, per the ASUS specification) and an Intel Core
Ultra 9 275HX, matching the ROG Strix SCAR 18 (G835LW). The limits are
therefore taken from the G835LW sibling entry and the ASUS specification
rather than dumped from this board's firmware.

Testing on a G635LX confirmed the attributes populate with this entry and
that writing nv_dynamic_boost changes the measured GPU power draw
(~151 W at minimum, ~169 W at maximum during inference), i.e. the limits
reach firmware.

Signed-off-by: Avi Fenesh <aviarchi1994@xxxxxxxxx>
---
 drivers/platform/x86/asus-armoury.h | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/platform/x86/asus-armoury.h b/drivers/platform/x86/asus-armoury.h
index c30d2b451..15584e775 100644
--- a/drivers/platform/x86/asus-armoury.h
+++ b/drivers/platform/x86/asus-armoury.h
@@ -1840,6 +1840,35 @@ static const struct dmi_system_id power_limits[] = {
 			.requires_fan_curve = true,
 		},
 	},
+	{
+		.matches = {
+			DMI_MATCH(DMI_BOARD_NAME, "G635LX"),
+		},
+		.driver_data = &(struct power_data) {
+			.ac_data = &(struct power_limits) {
+				.ppt_pl1_spl_min = 28,
+				.ppt_pl1_spl_def = 140,
+				.ppt_pl1_spl_max = 175,
+				.ppt_pl2_sppt_min = 28,
+				.ppt_pl2_sppt_max = 175,
+				.nv_dynamic_boost_min = 5,
+				.nv_dynamic_boost_max = 25,
+				.nv_temp_target_min = 75,
+				.nv_temp_target_max = 87,
+				.nv_tgp_min = 80,
+				.nv_tgp_max = 150,
+			},
+			.dc_data = &(struct power_limits) {
+				.ppt_pl1_spl_min = 25,
+				.ppt_pl1_spl_max = 55,
+				.ppt_pl2_sppt_min = 25,
+				.ppt_pl2_sppt_max = 70,
+				.nv_temp_target_min = 75,
+				.nv_temp_target_max = 87,
+			},
+			.requires_fan_curve = true,
+		},
+	},
 	{
 		.matches = {
 			DMI_MATCH(DMI_BOARD_NAME, "G713PV"),
-- 
2.53.0