Re: [PATCH] asus-wmi: Add support for platform_profile

[Hans de Goede]

Hi Luke,

Thank you for this patch, it is great to see more and more laptop
models getting support for the standard platform_profile userspace API.

On 8/13/21 4:42 AM, Luke D. Jones wrote:
> Add initial support for platform_profile where the support is
> based on availability of ASUS_THROTTLE_THERMAL_POLICY.
> 
> Signed-off-by: Luke D. Jones <luke@xxxxxxxxxx>
> ---
>  drivers/platform/x86/asus-wmi.c | 112 ++++++++++++++++++++++++++++++++
>  1 file changed, 112 insertions(+)
> 
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index 90a6a0d00deb..62260043c15c 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -26,6 +26,7 @@
>  #include <linux/rfkill.h>
>  #include <linux/pci.h>
>  #include <linux/pci_hotplug.h>
> +#include <linux/platform_profile.h>
>  #include <linux/power_supply.h>
>  #include <linux/hwmon.h>
>  #include <linux/hwmon-sysfs.h>
> @@ -219,6 +220,9 @@ struct asus_wmi {
>  	bool throttle_thermal_policy_available;
>  	u8 throttle_thermal_policy_mode;
>  
> +	struct platform_profile_handler platform_profile_handler;
> +	bool platform_profile_support;
> +
>  	// The RSOC controls the maximum charging percentage.
>  	bool battery_rsoc_available;
>  
> @@ -2144,6 +2148,106 @@ static ssize_t throttle_thermal_policy_store(struct device *dev,
>  // Throttle thermal policy: 0 - default, 1 - overboost, 2 - silent
>  static DEVICE_ATTR_RW(throttle_thermal_policy);
>  
> +/* Platform profile ***********************************************************/
> +static int platform_profile_get(struct platform_profile_handler *pprof,
> +				enum platform_profile_option *profile)
> +{
> +	struct asus_wmi *asus;
> +	int tp;
> +
> +	asus = container_of(pprof, struct asus_wmi, platform_profile_handler);
> +
> +	/* All possible toggles like throttle_thermal_policy here */
> +	if (asus->throttle_thermal_policy_available) {
> +		tp = asus->throttle_thermal_policy_mode;
> +	} else {
> +		return -1;
> +	}
> +
> +	if (tp < 0)
> +		return tp;
> +
> +	switch (tp) {
> +	case ASUS_THROTTLE_THERMAL_POLICY_DEFAULT:
> +		*profile = PLATFORM_PROFILE_BALANCED;
> +		break;
> +	case ASUS_THROTTLE_THERMAL_POLICY_OVERBOOST:
> +		*profile = PLATFORM_PROFILE_PERFORMANCE;
> +		break;
> +	case ASUS_THROTTLE_THERMAL_POLICY_SILENT:
> +		*profile = PLATFORM_PROFILE_QUIET;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static int platform_profile_set(struct platform_profile_handler *pprof,
> +				enum platform_profile_option profile)
> +{
> +	struct asus_wmi *asus;
> +	int tp;
> +
> +	asus = container_of(pprof, struct asus_wmi, platform_profile_handler);
> +
> +	/* All possible toggles like throttle_thermal_policy here */
> +	if (!asus->throttle_thermal_policy_available) {
> +		return -1;
> +	}
> +
> +	switch (profile) {
> +	case PLATFORM_PROFILE_PERFORMANCE:
> +		tp = ASUS_THROTTLE_THERMAL_POLICY_OVERBOOST;
> +		break;
> +	case PLATFORM_PROFILE_BALANCED:
> +		tp = ASUS_THROTTLE_THERMAL_POLICY_DEFAULT;
> +		break;
> +	case PLATFORM_PROFILE_QUIET:
> +		tp = ASUS_THROTTLE_THERMAL_POLICY_SILENT;
> +		break;
> +	default:
> +		return -EOPNOTSUPP;
> +	}
> +
> +	if (asus->throttle_thermal_policy_available) {

You already check for asus->throttle_thermal_policy_available a couple
of lines higher in this function and you return when it is not
available ...

I guess this was intended to also have a second if () for
fan-boost mode ?

Since you are not adding support for fan-boost mode at this time,
it would be best (IMHO) to drop this second if for now and
just take this path unconditionally.


> +		asus->throttle_thermal_policy_mode = tp;
> +		return throttle_thermal_policy_write(asus);
> +	}
> +	return 0;
> +}
> +
> +static int platform_profile_setup(struct asus_wmi *asus)
> +{
> +	int err;
> +
> +	if (asus->throttle_thermal_policy_available) {
> +		pr_info("Using throttle_thermal_policy for platform_profile support\n");
> +	} else {
> +		/*
> +		 * Not an error if a component platform_profile relies on is unavailable
> +		 * so early return, skipping the setup of platform_profile.
> +		*/
> +		return 0;
> +	}
> +	asus->platform_profile_handler.profile_get = platform_profile_get;
> +	asus->platform_profile_handler.profile_set = platform_profile_set;
> +
> +	set_bit(PLATFORM_PROFILE_QUIET, asus->platform_profile_handler.choices);
> +	set_bit(PLATFORM_PROFILE_BALANCED,
> +		asus->platform_profile_handler.choices);
> +	set_bit(PLATFORM_PROFILE_PERFORMANCE,
> +		asus->platform_profile_handler.choices);
> +
> +	err = platform_profile_register(&asus->platform_profile_handler);
> +	if (err)
> +		return err;
> +
> +	asus->platform_profile_support = true;
> +	return 0;
> +}
> +
>  /* Backlight ******************************************************************/
>  
>  static int read_backlight_power(struct asus_wmi *asus)
> @@ -2904,6 +3008,10 @@ static int asus_wmi_add(struct platform_device *pdev)
>  	else
>  		throttle_thermal_policy_set_default(asus);
>  
> +	err = platform_profile_setup(asus);
> +	if (err)
> +		goto fail_platform_profile_setup;
> +
>  	err = panel_od_check_present(asus);
>  	if (err)
>  		goto fail_panel_od;
> @@ -2993,6 +3101,7 @@ static int asus_wmi_add(struct platform_device *pdev)
>  	asus_wmi_sysfs_exit(asus->platform_device);
>  fail_sysfs:
>  fail_throttle_thermal_policy:
> +fail_platform_profile_setup:
>  fail_fan_boost_mode:

I think you need to add this:

	if (asus->platform_profile_support)
		platform_profile_remove();

here so that if later fail-exit paths are taken the platform_profile
support gets unregistered again.

>  fail_egpu_enable:
>  fail_dgpu_disable:
> @@ -3017,6 +3126,9 @@ static int asus_wmi_remove(struct platform_device *device)
>  	asus_fan_set_auto(asus);
>  	asus_wmi_battery_exit(asus);
>  
> +	if (asus->platform_profile_support)
> +		platform_profile_remove();
> +
>  	kfree(asus);
>  	return 0;
>  }
> 

Regards,

Hans