linux-kernel - [PATCH 9/9] platform/x86: asus-wmi: add setting dGPU TGP

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Date: Tue, 28 May 2024 13:36:26 +1200
From: "Luke D. Jones" <luke@...nes.dev>
To: hdegoede@...hat.com
Cc: ilpo.jarvinen@...ux.intel.com,
	corentin.chary@...il.com,
	platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Luke D. Jones" <luke@...nes.dev>
Subject: [PATCH 9/9] platform/x86: asus-wmi: add setting dGPU TGP

The dGPU TGP can be set on a few ROG laptops. This gnerally needs some
extra userspace inference to find the base and limit:

- Find max-tgp from nvidia-smi
- Find max-boost from nv_dynamic_boost_max (asus_wmi)
- (max-tgp - max-boost - initial TGP) = base TGP
- (max-tgp - max-boost - base TGP) = max additional TGP

On some laptops the dgpu_base_tgp may return 0, in which case the base
TGP must be derived as above.

Signed-off-by: Luke D. Jones <luke@...nes.dev>
---
 .../ABI/testing/sysfs-platform-asus-wmi       | 19 +++++++++++++++++++
 drivers/platform/x86/asus-wmi.c               |  9 +++++++++
 include/linux/platform_data/x86/asus-wmi.h    |  3 +++
 3 files changed, 31 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-platform-asus-wmi b/Documentation/ABI/testing/sysfs-platform-asus-wmi
index d221a3bc1a81..46df3452c9da 100644
--- a/Documentation/ABI/testing/sysfs-platform-asus-wmi
+++ b/Documentation/ABI/testing/sysfs-platform-asus-wmi
@@ -253,3 +253,22 @@ Contact:	"Luke Jones" <luke@...nes.dev>
 Description:
 		Set the maximum available system memory for the APU.
 		  * Min=0, Max=8
+
+What:		/sys/devices/platform/<platform>/dgpu_tgp
+Date:		Jun 2024
+KernelVersion:	6.11
+Contact:	"Luke Jones" <luke@...nes.dev>
+Description:
+		Read and set the extra TGP applied to the dGPU. This is applied on
+		top of the dgpu_base_tgp.
+
+		If the dGPU maximum power including boost is 175 then we can calculate:
+		175 - 25 (dynamic boost) - 70 (initial dgpu_tgp) = 80 (dgpu_base_tgp).
+		For NVIDIA dGPU the max power can be found with nvidia-smi.
+
+What:		/sys/devices/platform/<platform>/dgpu_base_tgp
+Date:		Jun 2024
+KernelVersion:	6.11
+Contact:	"Luke Jones" <luke@...nes.dev>
+Description:
+		Read the absolute base TGP of the dGPU.
diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 4b5fbae8c563..4d291429e7a1 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -123,6 +123,7 @@ module_param(fnlock_default, bool, 0444);
 #define NVIDIA_BOOST_MAX	25
 #define NVIDIA_TEMP_MIN		75
 #define NVIDIA_TEMP_MAX		87
+#define NVIDIA_GPU_POWER_MAX	70
 
 #define ASUS_SCREENPAD_BRIGHT_MIN 20
 #define ASUS_SCREENPAD_BRIGHT_MAX 255
@@ -797,6 +798,8 @@ WMI_ATTR_SIMPLE_RO(egpu_connected, ASUS_WMI_DEVID_EGPU_CONNECTED);
 WMI_ATTR_SIMPLE_RW(panel_od, 0, 1, ASUS_WMI_DEVID_PANEL_OD);
 WMI_ATTR_SIMPLE_RW(boot_sound, 0, 1, ASUS_WMI_DEVID_BOOT_SOUND);
 WMI_ATTR_SIMPLE_RO(charge_mode, ASUS_WMI_DEVID_CHARGE_MODE);
+WMI_ATTR_SIMPLE_RO(dgpu_base_tgp, ASUS_WMI_DEVID_DGPU_BASE_TGP);
+WMI_ATTR_SIMPLE_RW(dgpu_tgp, 0, NVIDIA_GPU_POWER_MAX, ASUS_WMI_DEVID_DGPU_SET_TGP);
 
 static ssize_t panel_fhd_store(struct device *dev,
 	struct device_attribute *attr, const char *buf, size_t count)
@@ -4204,6 +4207,8 @@ static struct attribute *platform_attributes[] = {
 	&dev_attr_boot_sound.attr,
 	&dev_attr_panel_od.attr,
 	&dev_attr_panel_fhd.attr,
+	&dev_attr_dgpu_base_tgp.attr,
+	&dev_attr_dgpu_tgp.attr,
 	&dev_attr_cores_enabled.attr,
 	&dev_attr_cores_max.attr,
 	&dev_attr_apu_mem.attr,
@@ -4280,6 +4285,10 @@ static umode_t asus_sysfs_is_visible(struct kobject *kobj,
 		devid = ASUS_WMI_DEVID_PANEL_OD;
 	else if (attr == &dev_attr_panel_fhd.attr)
 		devid = ASUS_WMI_DEVID_PANEL_FHD;
+	else if (attr == &dev_attr_dgpu_base_tgp.attr)
+		devid = ASUS_WMI_DEVID_DGPU_BASE_TGP;
+	else if (attr == &dev_attr_dgpu_tgp.attr)
+		ok = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_DGPU_SET_TGP);
 	else if (attr == &dev_attr_cores_enabled.attr
 		|| attr == &dev_attr_cores_max.attr)
 		ok = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_CORES_SET);
diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
index efe608861e55..71833bd60f27 100644
--- a/include/linux/platform_data/x86/asus-wmi.h
+++ b/include/linux/platform_data/x86/asus-wmi.h
@@ -135,6 +135,9 @@
 /* dgpu on/off */
 #define ASUS_WMI_DEVID_DGPU		0x00090020
 
+#define ASUS_WMI_DEVID_DGPU_BASE_TGP	0x00120099
+#define ASUS_WMI_DEVID_DGPU_SET_TGP	0x00120098
+
 /* gpu mux switch, 0 = dGPU, 1 = Optimus */
 #define ASUS_WMI_DEVID_GPU_MUX		0x00090016
 #define ASUS_WMI_DEVID_GPU_MUX_VIVO	0x00090026
-- 
2.45.1