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

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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: Luke D. Jones <luke@ljones.dev>
Link: https://lore.kernel.org/r/20220813092624.6228-1-luke@ljones.dev
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Luke D. Jones 2022-08-13 21:26:24 +12:00 committed by Hans de Goede
parent 3c3b55564a
commit 01ef026ab3
3 changed files with 66 additions and 0 deletions
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12
Documentation/ABI/testing/sysfs-platform-asus-wmi
View File

@ -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

51
drivers/platform/x86/asus-wmi.c
View File

@ -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);

3
include/linux/platform_data/x86/asus-wmi.h
View File

@ -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