Adds support for a dGPU-only mode on some laptops where when enabled
the boot GPU is the dGPU, and the iGPU is not visible.
Signed-off-by: Luke D. Jones <luke@xxxxxxxxxx>
---
drivers/platform/x86/asus-wmi.c | 92 ++++++++++++++++++++++
include/linux/platform_data/x86/asus-wmi.h | 3 +
2 files changed, 95 insertions(+)
diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 0e7fbed8a50d..25be8b422041 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -234,6 +234,9 @@ struct asus_wmi {
bool dgpu_disable_available;
bool dgpu_disable;
+ bool dgpu_only_available;
+ bool dgpu_only;
+
bool throttle_thermal_policy_available;
u8 throttle_thermal_policy_mode;
@@ -559,6 +562,87 @@ static void lid_flip_tablet_mode_get_state(struct asus_wmi *asus)
}
}
+/* dedicated GPU only *********************************************************/
+static int dgpu_only_check_present(struct asus_wmi *asus)
+{
+ u32 result;
+ int err;
+
+ asus->dgpu_only_available = false;
+
+ err = asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_DGPU, &result);
+ if (err) {
+ if (err == -ENODEV)
+ return 0;
+ return err;
+ }
+
+ if (result & ASUS_WMI_DSTS_PRESENCE_BIT) {
+ asus->dgpu_only_available = true;
+ asus->dgpu_only = result & ASUS_WMI_DSTS_STATUS_BIT;
+ }
+
+ return 0;
+}
+
+static int dgpu_only_write(struct asus_wmi *asus)
+{
+ u32 retval;
+ u8 value;
+ int err;
+
+ /* Don't rely on type conversion */
+ value = asus->dgpu_only ? 1 : 0;
+
+ err = asus_wmi_set_devstate(ASUS_WMI_DEVID_DGPU, value, &retval);
+ if (err) {
+ pr_warn("Failed to set dGPU-only mode: %d\n", err);
+ return err;
+ }
+
+ if (retval > 1) {
+ pr_warn("Failed to set dGPU-only mode (retval): 0x%x\n", retval);
+ return -EIO;
+ }
+
+ sysfs_notify(&asus->platform_device->dev.kobj, NULL, "dgpu_only");
+
+ return 0;
+}
+
+static ssize_t dgpu_only_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct asus_wmi *asus = dev_get_drvdata(dev);
+ u8 mode = asus->dgpu_only;
+
+ return sysfs_emit(buf, "%d\n", mode);
+}
+
+static ssize_t dgpu_only_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ bool enable;
+ int result;
+
+ struct asus_wmi *asus = dev_get_drvdata(dev);
+
+ result = kstrtobool(buf, &enable);
+ if (result)
+ return result;
+
+ asus->dgpu_only = enable;
+
+ result = dgpu_only_write(asus);
+ if (result)
+ return result;
+
+ return count;
+}
+
+static DEVICE_ATTR_RW(dgpu_only);
+
/* dGPU ********************************************************************/
static int dgpu_disable_check_present(struct asus_wmi *asus)
{
@@ -3258,6 +3342,7 @@ static struct attribute *platform_attributes[] = {
&dev_attr_touchpad.attr,
&dev_attr_egpu_enable.attr,
&dev_attr_dgpu_disable.attr,
+ &dev_attr_dgpu_only.attr,
&dev_attr_lid_resume.attr,
&dev_attr_als_enable.attr,
&dev_attr_fan_boost_mode.attr,
@@ -3288,6 +3373,8 @@ 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_dgpu_only.attr)
+ ok = asus->dgpu_only_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)
@@ -3557,6 +3644,10 @@ static int asus_wmi_add(struct platform_device *pdev)
if (err)
goto fail_dgpu_disable;
+ err = dgpu_only_check_present(asus);
+ if (err)
+ goto fail_dgpu_only;
+
err = fan_boost_mode_check_present(asus);
if (err)
goto fail_fan_boost_mode;
@@ -3671,6 +3762,7 @@ static int asus_wmi_add(struct platform_device *pdev)
fail_fan_boost_mode:
fail_egpu_enable:
fail_dgpu_disable:
+fail_dgpu_only:
fail_platform:
fail_panel_od:
kfree(asus);
diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
index a571b47ff362..f54d0e307d87 100644
--- a/include/linux/platform_data/x86/asus-wmi.h
+++ b/include/linux/platform_data/x86/asus-wmi.h
@@ -92,6 +92,9 @@
/* Keyboard dock */
#define ASUS_WMI_DEVID_KBD_DOCK 0x00120063
+/* Dedicated GPU only. When active the dGPU will be the only visible GPU */
+#define ASUS_WMI_DEVID_DEDICATED 0x00090016
+
/* dgpu on/off */
#define ASUS_WMI_DEVID_EGPU 0x00090019
--
2.37.1
