Merge branch 'ib-gpio-acpi-quirks' into devel

4 files changed, 50 insertions, 24 deletions

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index eb4528c87c0b..430a1475212d 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -414,7 +414,8 @@ EXPORT_SYMBOL_GPL(devm_acpi_dev_remove_driver_gpios);
 
 static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
 				      const char *name, int index,
-				      struct acpi_reference_args *args)
+				      struct acpi_reference_args *args,
+				      unsigned int *quirks)
 {
 	const struct acpi_gpio_mapping *gm;
 
@@ -430,6 +431,8 @@ static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
 			args->args[1] = par->line_index;
 			args->args[2] = par->active_low;
 			args->nargs = 3;
+
+			*quirks = gm->quirks;
 			return true;
 		}
 
@@ -461,8 +464,8 @@ acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio)
 	}
 }
 
-int
-acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update)
+static int
+__acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update)
 {
 	int ret = 0;
 
@@ -489,12 +492,31 @@ acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update)
 	return ret;
 }
 
+int
+acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info)
+{
+	struct device *dev = &info->adev->dev;
+	enum gpiod_flags old = *flags;
+	int ret;
+
+	ret = __acpi_gpio_update_gpiod_flags(&old, info->flags);
+	if (info->quirks & ACPI_GPIO_QUIRK_NO_IO_RESTRICTION) {
+		if (ret)
+			dev_warn(dev, FW_BUG "GPIO not in correct mode, fixing\n");
+	} else {
+		if (ret)
+			dev_dbg(dev, "Override GPIO initialization flags\n");
+		*flags = old;
+	}
+
+	return ret;
+}
+
 struct acpi_gpio_lookup {
 	struct acpi_gpio_info info;
 	int index;
 	int pin_index;
 	bool active_low;
-	struct acpi_device *adev;
 	struct gpio_desc *desc;
 	int n;
 };
@@ -531,8 +553,8 @@ static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
 			lookup->info.triggering = agpio->triggering;
 		} else {
 			lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio);
+			lookup->info.polarity = lookup->active_low;
 		}
-
 	}
 
 	return 1;
@@ -541,12 +563,13 @@ static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
 static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
 				     struct acpi_gpio_info *info)
 {
+	struct acpi_device *adev = lookup->info.adev;
 	struct list_head res_list;
 	int ret;
 
 	INIT_LIST_HEAD(&res_list);
 
-	ret = acpi_dev_get_resources(lookup->adev, &res_list,
+	ret = acpi_dev_get_resources(adev, &res_list,
 				     acpi_populate_gpio_lookup,
 				     lookup);
 	if (ret < 0)
@@ -557,11 +580,8 @@ static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
 	if (!lookup->desc)
 		return -ENOENT;
 
-	if (info) {
+	if (info)
 		*info = lookup->info;
-		if (lookup->active_low)
-			info->polarity = lookup->active_low;
-	}
 	return 0;
 }
 
@@ -570,6 +590,7 @@ static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
 				     struct acpi_gpio_lookup *lookup)
 {
 	struct acpi_reference_args args;
+	unsigned int quirks = 0;
 	int ret;
 
 	memset(&args, 0, sizeof(args));
@@ -581,14 +602,14 @@ static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
 		if (!adev)
 			return ret;
 
-		if (!acpi_get_driver_gpio_data(adev, propname, index, &args))
+		if (!acpi_get_driver_gpio_data(adev, propname, index, &args,
+					       &quirks))
 			return ret;
 	}
 	/*
 	 * The property was found and resolved, so need to lookup the GPIO based
 	 * on returned args.
 	 */
-	lookup->adev = args.adev;
 	if (args.nargs != 3)
 		return -EPROTO;
 
@@ -596,6 +617,8 @@ static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
 	lookup->pin_index = args.args[1];
 	lookup->active_low = !!args.args[2];
 
+	lookup->info.adev = args.adev;
+	lookup->info.quirks = quirks;
 	return 0;
 }
 
@@ -643,11 +666,11 @@ static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
 			return ERR_PTR(ret);
 
 		dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %d %u\n",
-			dev_name(&lookup.adev->dev), lookup.index,
+			dev_name(&lookup.info.adev->dev), lookup.index,
 			lookup.pin_index, lookup.active_low);
 	} else {
 		dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
-		lookup.adev = adev;
+		lookup.info.adev = adev;
 	}
 
 	ret = acpi_gpio_resource_lookup(&lookup, info);
@@ -664,7 +687,6 @@ struct gpio_desc *acpi_find_gpio(struct device *dev,
 	struct acpi_gpio_info info;
 	struct gpio_desc *desc;
 	char propname[32];
-	int err;
 	int i;
 
 	/* Try first from _DSD */
@@ -703,10 +725,7 @@ struct gpio_desc *acpi_find_gpio(struct device *dev,
 	if (info.polarity == GPIO_ACTIVE_LOW)
 		*lookupflags |= GPIO_ACTIVE_LOW;
 
-	err = acpi_gpio_update_gpiod_flags(dflags, info.flags);
-	if (err)
-		dev_dbg(dev, "Override GPIO initialization flags\n");
-
+	acpi_gpio_update_gpiod_flags(dflags, &info);
 	return desc;
 }
 
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index bdcdcdefdb71..ec0fd95bbf35 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -3690,9 +3690,7 @@ struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
 		desc = acpi_node_get_gpiod(fwnode, propname, index, &info);
 		if (!IS_ERR(desc)) {
 			active_low = info.polarity == GPIO_ACTIVE_LOW;
-			ret = acpi_gpio_update_gpiod_flags(&dflags, info.flags);
-			if (ret)
-				pr_debug("Override GPIO initialization flags\n");
+			acpi_gpio_update_gpiod_flags(&dflags, &info);
 		}
 	}
 
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index af48322839c3..cd4622863fe1 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -75,16 +75,20 @@ struct gpio_device {
 
 /**
  * struct acpi_gpio_info - ACPI GPIO specific information
+ * @adev: reference to ACPI device which consumes GPIO resource
  * @flags: GPIO initialization flags
  * @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo
  * @polarity: interrupt polarity as provided by ACPI
  * @triggering: triggering type as provided by ACPI
+ * @quirks: Linux specific quirks as provided by struct acpi_gpio_mapping
  */
 struct acpi_gpio_info {
+	struct acpi_device *adev;
 	enum gpiod_flags flags;
 	bool gpioint;
 	int polarity;
 	int triggering;
+	unsigned int quirks;
 };
 
 /* gpio suffixes used for ACPI and device tree lookup */
@@ -124,7 +128,7 @@ void acpi_gpiochip_request_interrupts(struct gpio_chip *chip);
 void acpi_gpiochip_free_interrupts(struct gpio_chip *chip);
 
 int acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags,
-				 enum gpiod_flags update);
+				 struct acpi_gpio_info *info);
 
 struct gpio_desc *acpi_find_gpio(struct device *dev,
 				 const char *con_id,
@@ -149,7 +153,7 @@ static inline void
 acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { }
 
 static inline int
-acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update)
+acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info)
 {
 	return 0;
 }
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index dc1ebfeeb5ec..06b6eb775115 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -978,6 +978,11 @@ struct acpi_gpio_mapping {
 	const char *name;
 	const struct acpi_gpio_params *data;
 	unsigned int size;
+
+/* Ignore IoRestriction field */
+#define ACPI_GPIO_QUIRK_NO_IO_RESTRICTION	BIT(0)
+
+	unsigned int quirks;
 };
 
 #if defined(CONFIG_ACPI) && defined(CONFIG_GPIOLIB)