[PATCH v3 3/3] asus-wmi: Add egpu enable method

From: Luke D. Jones
Date: Fri Aug 06 2021 - 22:37:31 EST


The X13 Flow laptops can utilise an external GPU. This requires
toggling an ACPI method which will first disable the internal
dGPU, and then enable the eGPU.

Signed-off-by: Luke D. Jones <luke@xxxxxxxxxx>
---
drivers/platform/x86/asus-wmi.c | 99 ++++++++++++++++++++++
include/linux/platform_data/x86/asus-wmi.h | 3 +
2 files changed, 102 insertions(+)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index bee22a12bf3d..90a6a0d00deb 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -210,6 +210,9 @@ struct asus_wmi {
u8 fan_boost_mode_mask;
u8 fan_boost_mode;

+ bool egpu_enable_available; // 0 = enable
+ bool egpu_enable;
+
bool dgpu_disable_available;
bool dgpu_disable;

@@ -517,6 +520,94 @@ static ssize_t dgpu_disable_store(struct device *dev,

static DEVICE_ATTR_RW(dgpu_disable);

+/* eGPU ********************************************************************/
+static int egpu_enable_check_present(struct asus_wmi *asus)
+{
+ u32 result;
+ int err;
+
+ asus->egpu_enable_available = false;
+
+ err = asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_EGPU, &result);
+ if (err) {
+ if (err == -ENODEV)
+ return 0;
+ return err;
+ }
+
+ if (result & ASUS_WMI_DSTS_PRESENCE_BIT) {
+ asus->egpu_enable_available = true;
+ asus->egpu_enable = result & ASUS_WMI_DSTS_STATUS_BIT;
+ }
+
+ return 0;
+}
+
+static int egpu_enable_write(struct asus_wmi *asus)
+{
+ u32 retval;
+ u8 value;
+ int err;
+
+ /* Don't rely on type conversion */
+ value = asus->egpu_enable ? 1 : 0;
+
+ err = asus_wmi_set_devstate(ASUS_WMI_DEVID_EGPU, value, &retval);
+
+ if (err) {
+ pr_warn("Failed to set egpu disable: %d\n", err);
+ return err;
+ }
+
+ if (retval > 1 || retval < 0) {
+ pr_warn("Failed to set egpu disable (retval): 0x%x\n", retval);
+ return -EIO;
+ }
+
+ sysfs_notify(&asus->platform_device->dev.kobj, NULL, "egpu_enable");
+
+ return 0;
+}
+
+static ssize_t egpu_enable_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct asus_wmi *asus = dev_get_drvdata(dev);
+ bool mode = asus->egpu_enable;
+
+ return sysfs_emit(buf, "%d\n", mode);
+}
+
+/* The ACPI call to enable the eGPU also disables the internal dGPU */
+static ssize_t egpu_enable_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->egpu_enable = enable;
+
+ result = egpu_enable_write(asus);
+ if (result)
+ return result;
+
+ /* Ensure that the kernel status of dgpu is updated */
+ result = dgpu_disable_check_present(asus);
+ if (result)
+ return result;
+
+ return count;
+}
+
+static DEVICE_ATTR_RW(egpu_enable);
+
/* Battery ********************************************************************/

/* The battery maximum charging percentage */
@@ -2502,6 +2593,7 @@ static struct attribute *platform_attributes[] = {
&dev_attr_camera.attr,
&dev_attr_cardr.attr,
&dev_attr_touchpad.attr,
+ &dev_attr_egpu_enable.attr,
&dev_attr_dgpu_disable.attr,
&dev_attr_lid_resume.attr,
&dev_attr_als_enable.attr,
@@ -2529,6 +2621,8 @@ static umode_t asus_sysfs_is_visible(struct kobject *kobj,
devid = ASUS_WMI_DEVID_LID_RESUME;
else if (attr == &dev_attr_als_enable.attr)
devid = ASUS_WMI_DEVID_ALS_ENABLE;
+ else if (attr == &dev_attr_egpu_enable.attr)
+ ok = asus->egpu_enable_available;
else if (attr == &dev_attr_dgpu_disable.attr)
ok = asus->dgpu_disable_available;
else if (attr == &dev_attr_fan_boost_mode.attr)
@@ -2792,6 +2886,10 @@ static int asus_wmi_add(struct platform_device *pdev)
if (err)
goto fail_platform;

+ err = egpu_enable_check_present(asus);
+ if (err)
+ goto fail_egpu_enable;
+
err = dgpu_disable_check_present(asus);
if (err)
goto fail_dgpu_disable;
@@ -2896,6 +2994,7 @@ static int asus_wmi_add(struct platform_device *pdev)
fail_sysfs:
fail_throttle_thermal_policy:
fail_fan_boost_mode:
+fail_egpu_enable:
fail_dgpu_disable:
fail_platform:
fail_panel_od:
diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
index a528f9d0e4b7..17dc5cb6f3f2 100644
--- a/include/linux/platform_data/x86/asus-wmi.h
+++ b/include/linux/platform_data/x86/asus-wmi.h
@@ -90,6 +90,9 @@
/* Keyboard dock */
#define ASUS_WMI_DEVID_KBD_DOCK 0x00120063

+/* dgpu on/off */
+#define ASUS_WMI_DEVID_EGPU 0x00090019
+
/* dgpu on/off */
#define ASUS_WMI_DEVID_DGPU 0x00090020

--
2.31.1