Commit 01ef026a authored by Luke D. Jones's avatar Luke D. Jones Committed by Hans de Goede
Browse files

platform/x86: asus-wmi: Support the hardware GPU MUX on some laptops 



Support the hardware GPU MUX switch available on some models. This
switch can toggle the MUX between:

- 0, Dedicated mode
- 1, Optimus mode

Optimus mode is the regular iGPU + dGPU available, while dedicated
mode switches the system to have only the dGPU available.

Signed-off-by: default avatarLuke D. Jones <luke@ljones.dev>
Link: https://lore.kernel.org/r/20220813092624.6228-1-luke@ljones.dev


Reviewed-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
parent 3c3b5556

Documentation/ABI/testing/sysfs-platform-asus-wmi

+12 −0
Original line number Diff line number Diff line
@@ -58,6 +58,18 @@ Description: 
			* 1 - overboost,

			* 2 - silent



What:		/sys/devices/platform/<platform>/gpu_mux_mode

Date:		Aug 2022

KernelVersion:	6.1

Contact:	"Luke Jones" <luke@ljones.dev>

Description:

		Switch the GPU hardware MUX mode. Laptops with this feature can

		can be toggled to boot with only the dGPU (discrete mode) or in

		standard Optimus/Hybrid mode. On switch a reboot is required:



			* 0 - Discrete GPU,

			* 1 - Optimus/Hybrid,



What:		/sys/devices/platform/<platform>/dgpu_disable

Date:		Aug 2022

KernelVersion:	5.17

drivers/platform/x86/asus-wmi.c

+51 −0
Original line number Diff line number Diff line
@@ -231,6 +231,7 @@ struct asus_wmi { 


	bool egpu_enable_available;

	bool dgpu_disable_available;

	bool gpu_mux_mode_available;



	bool throttle_thermal_policy_available;

	u8 throttle_thermal_policy_mode;
@@ -657,6 +658,52 @@ static ssize_t egpu_enable_store(struct device *dev, 
}

static DEVICE_ATTR_RW(egpu_enable);



/* gpu mux switch *************************************************************/

static ssize_t gpu_mux_mode_show(struct device *dev,

				 struct device_attribute *attr, char *buf)

{

	struct asus_wmi *asus = dev_get_drvdata(dev);

	int result;



	result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_GPU_MUX);

	if (result < 0)

		return result;



	return sysfs_emit(buf, "%d\n", result);

}



static ssize_t gpu_mux_mode_store(struct device *dev,

				  struct device_attribute *attr,

				  const char *buf, size_t count)

{

	struct asus_wmi *asus = dev_get_drvdata(dev);

	int result, err;

	u32 optimus;



	err = kstrtou32(buf, 10, &optimus);

	if (err)

		return err;



	if (optimus > 1)

		return -EINVAL;



	err = asus_wmi_set_devstate(ASUS_WMI_DEVID_GPU_MUX, optimus, &result);

	if (err) {

		dev_err(dev, "Failed to set GPU MUX mode: %d\n", err);

		return err;

	}

	/* !1 is considered a fail by ASUS */

	if (result != 1) {

		dev_warn(dev, "Failed to set GPU MUX mode (result): 0x%x\n", result);

		return -EIO;

	}



	sysfs_notify(&asus->platform_device->dev.kobj, NULL, "gpu_mux_mode");



	return count;

}

static DEVICE_ATTR_RW(gpu_mux_mode);



/* Battery ********************************************************************/



/* The battery maximum charging percentage */
@@ -3172,6 +3219,7 @@ static struct attribute *platform_attributes[] = { 
	&dev_attr_touchpad.attr,

	&dev_attr_egpu_enable.attr,

	&dev_attr_dgpu_disable.attr,

	&dev_attr_gpu_mux_mode.attr,

	&dev_attr_lid_resume.attr,

	&dev_attr_als_enable.attr,

	&dev_attr_fan_boost_mode.attr,
@@ -3202,6 +3250,8 @@ static umode_t asus_sysfs_is_visible(struct kobject *kobj, 
		ok = asus->egpu_enable_available;

	else if (attr == &dev_attr_dgpu_disable.attr)

		ok = asus->dgpu_disable_available;

	else if (attr == &dev_attr_gpu_mux_mode.attr)

		ok = asus->gpu_mux_mode_available;

	else if (attr == &dev_attr_fan_boost_mode.attr)

		ok = asus->fan_boost_mode_available;

	else if (attr == &dev_attr_throttle_thermal_policy.attr)
@@ -3465,6 +3515,7 @@ static int asus_wmi_add(struct platform_device *pdev) 


	asus->egpu_enable_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_EGPU);

	asus->dgpu_disable_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_DGPU);

	asus->gpu_mux_mode_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_GPU_MUX);

	asus->panel_overdrive_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_PANEL_OD);



	err = fan_boost_mode_check_present(asus);

include/linux/platform_data/x86/asus-wmi.h

+3 −0
Original line number Diff line number Diff line
@@ -99,6 +99,9 @@ 
/* dgpu on/off */

#define ASUS_WMI_DEVID_DGPU		0x00090020



/* gpu mux switch, 0 = dGPU, 1 = Optimus */

#define ASUS_WMI_DEVID_GPU_MUX		0x00090016



/* DSTS masks */

#define ASUS_WMI_DSTS_STATUS_BIT	0x00000001

#define ASUS_WMI_DSTS_UNKNOWN_BIT	0x00000002