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Date: Sat, 17 Jul 2021 18:05:03 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: "Luke D. Jones" <luke@...nes.dev>
Cc: pobrn@...tonmail.com, mgross@...ux.intel.com,
corentin.chary@...il.com, platform-driver-x86@...r.kernel.org,
linux-kernel@...r.kernel.org, acpi4asus-user@...ts.sourceforge.net
Subject: Re: [PATCH 2/4] asus-wmi: Add dgpu disable method
Hi,
On 7/17/21 10:13 AM, Luke D. Jones wrote:
> In Windows the ASUS Armory Crate program can enable or disable the
> dGPU via a WMI call. This functions much the same as various Linux
> methods in software where the dGPU is removed from the device tree.
>
> However the WMI call saves the state of dGPU (enabled or not) and
> this then changes the dGPU visibility in Linux with no way for
> Linux users to re-enable it. We expose the WMI method so users can
> see and change the dGPU ACPI state.
>
> Signed-off-by: Luke D. Jones <luke@...nes.dev>
> ---
> 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 cd881443bc2f..02762a60d27a 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 dgpu_disable_available;
> + bool dgpu_disable;
> +
> bool throttle_thermal_policy_available;
> u8 throttle_thermal_policy_mode;
>
> @@ -427,6 +430,94 @@ static void lid_flip_tablet_mode_get_state(struct asus_wmi *asus)
> }
> }
>
> +/* dGPU ********************************************************************/
> +static int dgpu_disable_check_present(struct asus_wmi *asus)
> +{
> + u32 result;
> + int err;
> +
> + asus->dgpu_disable_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_disable_available = true;
> + asus->dgpu_disable = result & ASUS_WMI_DSTS_STATUS_BIT;
> + }
> +
> + return 0;
> +}
> +
> +static int dgpu_disable_write(struct asus_wmi *asus)
> +{
> + int err;
> + u8 value;
> + u32 retval;
Upside-down-christmastree declaration order please.
> +
> + value = asus->dgpu_disable;
> +
> + err = asus_wmi_set_devstate(ASUS_WMI_DEVID_DGPU, value, &retval);
> +
> + if (err) {
> + pr_warn("Failed to set dgpu disable: %d\n", err);
> + return err;
> + }
> +
> + if (retval > 1 || retval < 0) {
> + pr_warn("Failed to set dgpu disable (retval): 0x%x\n", retval);
> + return -EIO;
> + }
> +
> + sysfs_notify(&asus->platform_device->dev.kobj, NULL, "dgpu_disable");
> +
> + return 0;
> +}
> +
> +static ssize_t dgpu_disable_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct asus_wmi *asus = dev_get_drvdata(dev);
> + bool mode = asus->dgpu_disable;
This bool local variable is not really necessary, instead you can just do:
return sysfs_emit(buf, "%d\n", asus->dgpu_disable);
The same applies to patch 1/3 btw.
> +
> + return sysfs_emit(buf, "%d\n", mode);
> +}
> +
> +static ssize_t dgpu_disable_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + int result;
> + bool disable;
> + struct asus_wmi *asus = dev_get_drvdata(dev);
Upside-down-christmastree declaration order please.
> +
> + result = kstrtobool(buf, &disable);
> + if (result == -EINVAL)
> + return result;
Just "if (result) ..." please.
> +
> + asus->dgpu_disable = disable;
> + /*
> + * The ACPI call used does not save the mode unless the call is run twice.
> + * Once to disable, then once to check status and save - this is two code
> + * paths in the method in the ACPI dumps.
> + */
> + result = dgpu_disable_write(asus);
> + if (result != 0)
> + return result;
> +
> + result = dgpu_disable_write(asus);
> + if (result != 0)
> + return result;
> +
> + return count;
> +}
> +
> +static DEVICE_ATTR_RW(dgpu_disable);
> +
> /* Battery ********************************************************************/
>
> /* The battery maximum charging percentage */
> @@ -2411,6 +2502,7 @@ static struct attribute *platform_attributes[] = {
> &dev_attr_camera.attr,
> &dev_attr_cardr.attr,
> &dev_attr_touchpad.attr,
> + &dev_attr_dgpu_disable.attr,
> &dev_attr_lid_resume.attr,
> &dev_attr_als_enable.attr,
> &dev_attr_fan_boost_mode.attr,
> @@ -2437,6 +2529,8 @@ 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_dgpu_disable.attr)
> + ok = asus->dgpu_disable_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)
> @@ -2698,6 +2792,10 @@ static int asus_wmi_add(struct platform_device *pdev)
> if (err)
> goto fail_platform;
>
> + err = dgpu_disable_check_present(asus);
> + if (err)
> + goto fail_dgpu_disable;
> +
> err = fan_boost_mode_check_present(asus);
> if (err)
> goto fail_fan_boost_mode;
> @@ -2798,6 +2896,7 @@ static int asus_wmi_add(struct platform_device *pdev)
> fail_sysfs:
> fail_throttle_thermal_policy:
> fail_fan_boost_mode:
> +fail_dgpu_disable:
> 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 428aea701c7b..a528f9d0e4b7 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_DGPU 0x00090020
> +
> /* DSTS masks */
> #define ASUS_WMI_DSTS_STATUS_BIT 0x00000001
> #define ASUS_WMI_DSTS_UNKNOWN_BIT 0x00000002
>
Regards,
Hans
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