[PATCH v2 1/1] ACPI: platform_profile: Treat quiet and low power the same

[Mario Limonciello <superm1@kernel.org>]

From: Mario Limonciello <mario.limonciello@amd.com>

When two drivers don't support all the same profiles the legacy interface
only exports the common profiles.

This causes problems for cases where one driver uses low-power but another
uses quiet because the result is that neither is exported to sysfs.

If one platform profile handler supports quiet and the other
supports low power treat them as the same for the purpose of
the sysfs interface.

Fixes: 688834743d67 ("ACPI: platform_profile: Allow multiple handlers")
Reported-by: Antheas Kapenekakis <lkml@antheas.dev>
Closes: https://lore.kernel.org/platform-driver-x86/e64b771e-3255-42ad-9257-5b8fc6c24ac9@gmx.de/T/#mc068042dd29df36c16c8af92664860fc4763974b
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
 drivers/acpi/platform_profile.c | 38 ++++++++++++++++++++++++++++++---
 1 file changed, 35 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
index 2ad53cc6aae53..d9a7cc5891734 100644
--- a/drivers/acpi/platform_profile.c
+++ b/drivers/acpi/platform_profile.c
@@ -73,8 +73,20 @@ static int _store_class_profile(struct device *dev, void *data)
 
 	lockdep_assert_held(&profile_lock);
 	handler = to_pprof_handler(dev);
-	if (!test_bit(*bit, handler->choices))
-		return -EOPNOTSUPP;
+	if (!test_bit(*bit, handler->choices)) {
+		switch (*bit) {
+		case PLATFORM_PROFILE_QUIET:
+			*bit = PLATFORM_PROFILE_LOW_POWER;
+			break;
+		case PLATFORM_PROFILE_LOW_POWER:
+			*bit = PLATFORM_PROFILE_QUIET;
+			break;
+		default:
+			return -EOPNOTSUPP;
+		}
+		if (!test_bit(*bit, handler->choices))
+			return -EOPNOTSUPP;
+	}
 
 	return handler->ops->profile_set(dev, *bit);
 }
@@ -252,8 +264,16 @@ static int _aggregate_choices(struct device *dev, void *data)
 	handler = to_pprof_handler(dev);
 	if (test_bit(PLATFORM_PROFILE_LAST, aggregate))
 		bitmap_copy(aggregate, handler->choices, PLATFORM_PROFILE_LAST);
-	else
+	else {
+		/* treat quiet and low power the same for aggregation purposes */
+		if (test_bit(PLATFORM_PROFILE_QUIET, handler->choices) &&
+		    test_bit(PLATFORM_PROFILE_LOW_POWER, aggregate))
+			set_bit(PLATFORM_PROFILE_QUIET, aggregate);
+		else if (test_bit(PLATFORM_PROFILE_LOW_POWER, handler->choices) &&
+			 test_bit(PLATFORM_PROFILE_QUIET, aggregate))
+			set_bit(PLATFORM_PROFILE_LOW_POWER, aggregate);
 		bitmap_and(aggregate, handler->choices, aggregate, PLATFORM_PROFILE_LAST);
+	}
 
 	return 0;
 }
@@ -305,6 +325,13 @@ static int _aggregate_profiles(struct device *dev, void *data)
 	if (err)
 		return err;
 
+	/* treat low-power and quiet as the same */
+	if ((*profile == PLATFORM_PROFILE_LOW_POWER &&
+	     val == PLATFORM_PROFILE_QUIET) ||
+	    (*profile == PLATFORM_PROFILE_QUIET &&
+	     val == PLATFORM_PROFILE_LOW_POWER))
+		*profile = val;
+
 	if (*profile != PLATFORM_PROFILE_LAST && *profile != val)
 		*profile = PLATFORM_PROFILE_CUSTOM;
 	else
@@ -531,6 +558,11 @@ struct device *platform_profile_register(struct device *dev, const char *name,
 		dev_err(dev, "Failed to register platform_profile class device with empty choices\n");
 		return ERR_PTR(-EINVAL);
 	}
+	if (test_bit(PLATFORM_PROFILE_QUIET, pprof->choices) &&
+	    test_bit(PLATFORM_PROFILE_LOW_POWER, pprof->choices)) {
+		dev_err(dev, "Failed to register platform_profile class device with both quiet and low-power\n");
+		return ERR_PTR(-EINVAL);
+	}
 
 	guard(mutex)(&profile_lock);
 
-- 
2.43.0