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SubjectRe: [PATCH 2/3] asus-wmi: Add dgpu disable method
Thanks Hans, all feedback applied.

On Tue, Jul 6 2021 at 12:10:45 +0200, Hans de Goede
<hdegoede@redhat.com> wrote:
> Hi,
>
> Some review remarks inline (mostly just echo-ing what Barnabás
> already said):
>
> On 7/5/21 12:21 AM, Luke D. Jones wrote:
>> In Windows the ASUS Armory Crate progrm 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@ljones.dev>
>> ---
>> drivers/platform/x86/asus-wmi.c | 98
>> ++++++++++++++++++++++
>> include/linux/platform_data/x86/asus-wmi.h | 3 +
>> 2 files changed, 101 insertions(+)
>>
>> diff --git a/drivers/platform/x86/asus-wmi.c
>> b/drivers/platform/x86/asus-wmi.c
>> index 2468076d6cd8..8dc3f7ed021f 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;
>> + u8 dgpu_disable_mode;
>> +
>> bool throttle_thermal_policy_available;
>> u8 throttle_thermal_policy_mode;
>>
>> @@ -427,6 +430,93 @@ 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_mode = result & ASUS_WMI_DSTS_STATUS_BIT;
>
> Missing {}
>
>> +
>> + return 0;
>> +}
>> +
>> +static int dgpu_disable_write(struct asus_wmi *asus)
>> +{
>> + int err;
>> + u8 value;
>> + u32 retval;
>> +
>> + value = asus->dgpu_disable_mode;
>> +
>> + err = asus_wmi_set_devstate(ASUS_WMI_DEVID_DGPU, value, &retval);
>> +
>> + sysfs_notify(&asus->platform_device->dev.kobj, NULL,
>> + "dgpu_disable");
>
> Make this one line please.
>
>> +
>> + 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);
>
> Make this one line please.
>
>> + return -EIO;
>> + }
>> +
>> + 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);
>> + u8 mode = asus->dgpu_disable_mode;
>> +
>> + return scnprintf(buf, PAGE_SIZE, "%d\n", mode);
>
> sysfs_emit() please.
>
>> +}
>> +
>> +static ssize_t dgpu_disable_store(struct device *dev,
>> + struct device_attribute *attr,
>> + const char *buf, size_t count)
>> +{
>> + int result;
>> + u8 disable;
>> + struct asus_wmi *asus = dev_get_drvdata(dev);
>> +
>> + result = kstrtou8(buf, 10, &disable);
>> + if (result < 0)
>> + return result;
>> +
>> + if (disable > 1 || disable < 0)
>> + return -EINVAL;
>
> Drop the "disable < 0" check please.
>
>> +
>> + asus->dgpu_disable_mode = 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.
>> + */
>> + dgpu_disable_write(asus);
>> + dgpu_disable_write(asus);
>> +
>> + return count;
>> +}
>> +
>> +static DEVICE_ATTR_RW(dgpu_disable);
>> +
>> /* Battery
>> ********************************************************************/
>>
>> /* The battery maximum charging percentage */
>> @@ -2412,6 +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,
>> @@ -2438,6 +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)
>> @@ -2699,6 +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;
>> @@ -2799,6 +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
>>
>
> Otherwise this looks good to me.
>
> Regards,
>
> Hans
>


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