ACPI: platform: Add balanced-performance platform profile

Some devices, including most Microsoft Surface devices, have a platform
profile somewhere inbetween balanced and performance. More specifically,
adding this profile allows the following mapping on Surface devices:

  Vendor Name           Platform Profile
  ------------------------------------------
  Battery Saver         low-power
  Recommended           balanced
  Better Performance    balanced-performance
  Best Performance      performance
Suggested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Documentation/ABI/testing/sysfs-platform_profile

@@ -5,13 +5,17 @@ Description:	This file contains a space-separated list of profiles supported for
 
 		Drivers must use the following standard profile-names:
 
-		============	============================================
-		low-power	Low power consumption
-		cool		Cooler operation
-		quiet		Quieter operation
-		balanced	Balance between low power consumption and performance
-		performance	High performance operation
-		============	============================================
+		====================	========================================
+		low-power		Low power consumption
+		cool			Cooler operation
+		quiet			Quieter operation
+		balanced		Balance between low power consumption
+					and performance
+		balanced-performance	Balance between performance and low
+					power consumption with a slight bias
+					towards performance
+		performance		High performance operation
+		====================	========================================
 
 		Userspace may expect drivers to offer more than one of these
 		standard profile names.

drivers/acpi/platform_profile.c

@@ -17,6 +17,7 @@ static const char * const profile_names[] = {
 	[PLATFORM_PROFILE_COOL] = "cool",
 	[PLATFORM_PROFILE_QUIET] = "quiet",
 	[PLATFORM_PROFILE_BALANCED] = "balanced",
+	[PLATFORM_PROFILE_BALANCED_PERFORMANCE] = "balanced-performance",
 	[PLATFORM_PROFILE_PERFORMANCE] = "performance",
 };
 static_assert(ARRAY_SIZE(profile_names) == PLATFORM_PROFILE_LAST);

include/linux/platform_profile.h

@@ -21,6 +21,7 @@ enum platform_profile_option {
 	PLATFORM_PROFILE_COOL,
 	PLATFORM_PROFILE_QUIET,
 	PLATFORM_PROFILE_BALANCED,
+	PLATFORM_PROFILE_BALANCED_PERFORMANCE,
 	PLATFORM_PROFILE_PERFORMANCE,
 	PLATFORM_PROFILE_LAST, /*must always be last */
 };