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SubjectRe: [PATCH 1/3] asus-wmi: Add panel overdrive functionality
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Hi,

Thank you for your patches, I've added several remarks inline (below);

On 7/5/21 12:21 AM, Luke D. Jones wrote:
> Some ASUS ROG laptops have the ability to drive the display panel
> a a higher rate to eliminate or reduce ghosting.
>
> Signed-off-by: Luke D. Jones <luke@ljones.dev>
> ---
> drivers/platform/x86/asus-wmi.c | 92 ++++++++++++++++++++++
> include/linux/platform_data/x86/asus-wmi.h | 1 +
> 2 files changed, 93 insertions(+)
>
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index ebaeb7bb80f5..2468076d6cd8 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -216,6 +216,9 @@ struct asus_wmi {
> // The RSOC controls the maximum charging percentage.
> bool battery_rsoc_available;
>
> + bool panel_overdrive_available;
> + u8 panel_overdrive;
> +
> struct hotplug_slot hotplug_slot;
> struct mutex hotplug_lock;
> struct mutex wmi_lock;
> @@ -1221,6 +1224,87 @@ static int asus_wmi_rfkill_init(struct asus_wmi *asus)
> return result;
> }
>
> +/* Panel Overdrive ************************************************************/
> +static int panel_od_check_present(struct asus_wmi *asus)
> +{
> + u32 result;
> + int err;
> +
> + asus->panel_overdrive_available = false;
> +
> + err = asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_PANEL_OD, &result);
> + if (err) {
> + if (err == -ENODEV)
> + return 0;
> + return err;
> + }
> +
> + if (result & ASUS_WMI_DSTS_PRESENCE_BIT)
> + asus->panel_overdrive_available = true;
> + asus->panel_overdrive = result & ASUS_WMI_DSTS_STATUS_BIT;

As the kernel-test-robot pointed out this if is missing { } around the
2 statements which should only be executed if the condition is true.

> +
> + return 0;
> +}
> +
> +static int panel_od_write(struct asus_wmi *asus)
> +{
> + int err;
> + u8 value;
> + u32 retval;
> +
> + value = asus->panel_overdrive;
> +
> + err = asus_wmi_set_devstate(ASUS_WMI_DEVID_PANEL_OD, value, &retval);
> +
> + sysfs_notify(&asus->platform_device->dev.kobj, NULL,
> + "panel_od");

Please make this a single line.

> +
> + if (err) {
> + pr_warn("Failed to set panel overdrive: %d\n", err);
> + return err;
> + }
> +
> + if (retval > 1 || retval < 0) {
> + pr_warn("Failed to set panel overdrive (retval): 0x%x\n",
> + retval);

Please make this a single line too.

> + return -EIO;
> + }
> +
> + return 0;
> +}
> +
> +static ssize_t panel_od_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct asus_wmi *asus = dev_get_drvdata(dev);
> + u8 mode = asus->panel_overdrive;
> +
> + return scnprintf(buf, PAGE_SIZE, "%d\n", mode);
> +}
> +
> +static ssize_t panel_od_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + int result;
> + u8 overdrive;
> + struct asus_wmi *asus = dev_get_drvdata(dev);
> +
> + result = kstrtou8(buf, 10, &overdrive);
> + if (result < 0)
> + return result;
> +
> + if (overdrive > 1 || overdrive < 0)

An u8 can never be < 0, so please drop that check
(it will likely trigger compiler warnings in some cases).

> + return -EINVAL;
> +
> + asus->panel_overdrive = overdrive;
> + panel_od_write(asus);
> +
> + return count;
> +}
> +
> +static DEVICE_ATTR_RW(panel_od);
> +
> /* Quirks *********************************************************************/
>
> static void asus_wmi_set_xusb2pr(struct asus_wmi *asus)
> @@ -2332,6 +2416,7 @@ static struct attribute *platform_attributes[] = {
> &dev_attr_als_enable.attr,
> &dev_attr_fan_boost_mode.attr,
> &dev_attr_throttle_thermal_policy.attr,
> + &dev_attr_panel_od.attr,
> NULL
> };
>
> @@ -2357,6 +2442,8 @@ static umode_t asus_sysfs_is_visible(struct kobject *kobj,
> ok = asus->fan_boost_mode_available;
> else if (attr == &dev_attr_throttle_thermal_policy.attr)
> ok = asus->throttle_thermal_policy_available;
> + else if (attr == &dev_attr_panel_od.attr)
> + ok = asus->panel_overdrive_available;
>
> if (devid != -1)
> ok = !(asus_wmi_get_devstate_simple(asus, devid) < 0);
> @@ -2622,6 +2709,10 @@ static int asus_wmi_add(struct platform_device *pdev)
> else
> throttle_thermal_policy_set_default(asus);
>
> + err = panel_od_check_present(asus);
> + if (err)
> + goto fail_panel_od;
> +
> err = asus_wmi_sysfs_init(asus->platform_device);
> if (err)
> goto fail_sysfs;
> @@ -2709,6 +2800,7 @@ static int asus_wmi_add(struct platform_device *pdev)
> fail_throttle_thermal_policy:
> fail_fan_boost_mode:
> fail_platform:
> +fail_panel_od:
> kfree(asus);
> return err;
> }
> diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
> index 2f274cf52805..428aea701c7b 100644
> --- a/include/linux/platform_data/x86/asus-wmi.h
> +++ b/include/linux/platform_data/x86/asus-wmi.h
> @@ -61,6 +61,7 @@
> #define ASUS_WMI_DEVID_THROTTLE_THERMAL_POLICY 0x00120075
>
> /* Misc */
> +#define ASUS_WMI_DEVID_PANEL_OD 0x00050019
> #define ASUS_WMI_DEVID_CAMERA 0x00060013
> #define ASUS_WMI_DEVID_LID_FLIP 0x00060062
>
>

Otherwise this looks good to me,

Regards,

Hans

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