Merge patch series "gpiolib: acpi: Refactor to shrink the code by ~8%"

Andy Shevchenko <andriy.shevchenko@linux.intel.com> says:

A simple refactoring of the GPIO ACPI library parts to get an impressive
~8% code shrink on x86_64 and ~2% on x86_32. Also reduces a C code a bit.

add/remove: 0/2 grow/shrink: 0/5 up/down: 0/-1221 (-1221)
Function                                     old     new   delta
acpi_gpio_property_lookup                    425     414     -11
acpi_find_gpio.__UNIQUE_ID_ddebug478          56       -     -56
acpi_dev_gpio_irq_wake_get_by.__UNIQUE_ID_ddebug480      56       -     -56
acpi_find_gpio                               354     216    -138
acpi_get_gpiod_by_index                      462     307    -155
__acpi_find_gpio                             877     638    -239
acpi_dev_gpio_irq_wake_get_by                695     129    -566
Total: Before=15375, After=14154, chg -7.94%

Link: https://lore.kernel.org/r/20250403160034.2680485-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Author: andy-shev

drivers/gpio/gpiolib-acpi.c

@@ -96,21 +96,21 @@ struct acpi_gpio_chip {
  * @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
+ * @wake_capable: wake capability as provided by ACPI
  * @pin_config: pin bias as provided by ACPI
  * @polarity: interrupt polarity as provided by ACPI
  * @triggering: triggering type as provided by ACPI
- * @wake_capable: wake capability as provided by ACPI
  * @debounce: debounce timeout 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;
+	bool wake_capable;
 	int pin_config;
 	int polarity;
 	int triggering;
-	bool wake_capable;
 	unsigned int debounce;
 	unsigned int quirks;
 };
@@ -653,12 +653,12 @@ static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
 
 	for (gm = adev->driver_gpios; gm->name; gm++)
 		if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
-			const struct acpi_gpio_params *par = gm->data + index;
+			const struct acpi_gpio_params *params = gm->data + index;
 
 			args->fwnode = acpi_fwnode_handle(adev);
-			args->args[0] = par->crs_entry_index;
-			args->args[1] = par->line_index;
-			args->args[2] = par->active_low;
+			args->args[0] = params->crs_entry_index;
+			args->args[1] = params->line_index;
+			args->args[2] = params->active_low;
 			args->nargs = 3;
 
 			*quirks = gm->quirks;
@@ -744,16 +744,15 @@ static int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
 
 struct acpi_gpio_lookup {
 	struct acpi_gpio_info info;
-	int index;
-	u16 pin_index;
-	bool active_low;
+	struct acpi_gpio_params params;
 	struct gpio_desc *desc;
 	int n;
 };
 
 static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
 {
 	struct acpi_gpio_lookup *lookup = data;
+	struct acpi_gpio_params *params = &lookup->params;
 
 	if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
 		return 1;
@@ -765,12 +764,12 @@ static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
 		u16 pin_index;
 
 		if (lookup->info.quirks & ACPI_GPIO_QUIRK_ONLY_GPIOIO && gpioint)
-			lookup->index++;
+			params->crs_entry_index++;
 
-		if (lookup->n++ != lookup->index)
+		if (lookup->n++ != params->crs_entry_index)
 			return 1;
 
-		pin_index = lookup->pin_index;
+		pin_index = params->line_index;
 		if (pin_index >= agpio->pin_table_length)
 			return 1;
 
@@ -796,7 +795,7 @@ static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
 			lookup->info.polarity = agpio->polarity;
 			lookup->info.triggering = agpio->triggering;
 		} else {
-			lookup->info.polarity = lookup->active_low;
+			lookup->info.polarity = params->active_low;
 		}
 
 		lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio, lookup->info.polarity);
@@ -805,8 +804,7 @@ static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
 	return 1;
 }
 
-static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
-				     struct acpi_gpio_info *info)
+static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup)
 {
 	struct acpi_device *adev = lookup->info.adev;
 	struct list_head res_list;
@@ -825,22 +823,21 @@ static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
 	if (!lookup->desc)
 		return -ENOENT;
 
-	if (info)
-		*info = lookup->info;
 	return 0;
 }
 
-static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
-				     const char *propname, int index,
+static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode, const char *propname,
 				     struct acpi_gpio_lookup *lookup)
 {
 	struct fwnode_reference_args args;
+	struct acpi_gpio_params *params = &lookup->params;
+	unsigned int index = params->crs_entry_index;
 	unsigned int quirks = 0;
 	int ret;
 
 	memset(&args, 0, sizeof(args));
-	ret = __acpi_node_get_property_reference(fwnode, propname, index, 3,
-						 &args);
+
+	ret = __acpi_node_get_property_reference(fwnode, propname, index, 3, &args);
 	if (ret) {
 		struct acpi_device *adev;
 
@@ -857,9 +854,9 @@ static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
 	if (args.nargs != 3)
 		return -EPROTO;
 
-	lookup->index = args.args[0];
-	lookup->pin_index = args.args[1];
-	lookup->active_low = !!args.args[2];
+	params->crs_entry_index = args.args[0];
+	params->line_index = args.args[1];
+	params->active_low = !!args.args[2];
 
 	lookup->info.adev = to_acpi_device_node(args.fwnode);
 	lookup->info.quirks = quirks;
@@ -871,96 +868,83 @@ static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
  * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
  * @adev: pointer to a ACPI device to get GPIO from
  * @propname: Property name of the GPIO (optional)
- * @index: index of GpioIo/GpioInt resource (starting from %0)
- * @info: info pointer to fill in (optional)
+ * @lookup: pointer to struct acpi_gpio_lookup to fill in
  *
- * Function goes through ACPI resources for @adev and based on @index looks
+ * Function goes through ACPI resources for @adev and based on @lookup.index looks
  * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
- * and returns it. @index matches GpioIo/GpioInt resources only so if there
- * are total %3 GPIO resources, the index goes from %0 to %2.
+ * and returns it. @lookup.index matches GpioIo/GpioInt resources only so if there
+ * are total 3 GPIO resources, the index goes from 0 to 2.
  *
  * If @propname is specified the GPIO is looked using device property. In
  * that case @index is used to select the GPIO entry in the property value
  * (in case of multiple).
  *
  * Returns:
- * GPIO descriptor to use with Linux generic GPIO API.
- * If the GPIO cannot be translated or there is an error an ERR_PTR is
- * returned.
+ * 0 on success, negative errno on failure.
+ *
+ * The @lookup is filled with GPIO descriptor to use with Linux generic GPIO API.
+ * If the GPIO cannot be translated an error will be returned.
  *
  * Note: if the GPIO resource has multiple entries in the pin list, this
  * function only returns the first.
  */
-static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
-						 const char *propname,
-						 int index,
-						 struct acpi_gpio_info *info)
+static int acpi_get_gpiod_by_index(struct acpi_device *adev, const char *propname,
+				   struct acpi_gpio_lookup *lookup)
 {
-	struct acpi_gpio_lookup lookup;
+	struct acpi_gpio_info *info = &lookup->info;
+	struct acpi_gpio_params *params = &lookup->params;
 	int ret;
 
-	memset(&lookup, 0, sizeof(lookup));
-	lookup.index = index;
-
 	if (propname) {
 		dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);
 
-		ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev),
-						propname, index, &lookup);
+		ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev), propname, lookup);
 		if (ret)
-			return ERR_PTR(ret);
+			return ret;
 
-		dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %u %u\n",
-			dev_name(&lookup.info.adev->dev), lookup.index,
-			lookup.pin_index, lookup.active_low);
+		dev_dbg(&adev->dev, "GPIO: _DSD returned %s %u %u %u\n",
+			dev_name(&info->adev->dev),
+			params->crs_entry_index, params->line_index, params->active_low);
 	} else {
-		dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
-		lookup.info.adev = adev;
+		dev_dbg(&adev->dev, "GPIO: looking up %u in _CRS\n", params->crs_entry_index);
+		info->adev = adev;
 	}
 
-	ret = acpi_gpio_resource_lookup(&lookup, info);
-	return ret ? ERR_PTR(ret) : lookup.desc;
+	return acpi_gpio_resource_lookup(lookup);
 }
 
 /**
  * acpi_get_gpiod_from_data() - get a GPIO descriptor from ACPI data node
  * @fwnode: pointer to an ACPI firmware node to get the GPIO information from
  * @propname: Property name of the GPIO
- * @index: index of GpioIo/GpioInt resource (starting from %0)
- * @info: info pointer to fill in (optional)
+ * @lookup: pointer to struct acpi_gpio_lookup to fill in
  *
  * This function uses the property-based GPIO lookup to get to the GPIO
  * resource with the relevant information from a data-only ACPI firmware node
  * and uses that to obtain the GPIO descriptor to return.
  *
  * Returns:
- * GPIO descriptor to use with Linux generic GPIO API.
- * If the GPIO cannot be translated or there is an error an ERR_PTR is
- * returned.
+ * 0 on success, negative errno on failure.
+ *
+ * The @lookup is filled with GPIO descriptor to use with Linux generic GPIO API.
+ * If the GPIO cannot be translated an error will be returned.
  */
-static struct gpio_desc *acpi_get_gpiod_from_data(struct fwnode_handle *fwnode,
-						  const char *propname,
-						  int index,
-						  struct acpi_gpio_info *info)
+static int acpi_get_gpiod_from_data(struct fwnode_handle *fwnode, const char *propname,
+				    struct acpi_gpio_lookup *lookup)
 {
-	struct acpi_gpio_lookup lookup;
 	int ret;
 
 	if (!is_acpi_data_node(fwnode))
-		return ERR_PTR(-ENODEV);
+		return -ENODEV;
 
 	if (!propname)
-		return ERR_PTR(-EINVAL);
-
-	memset(&lookup, 0, sizeof(lookup));
-	lookup.index = index;
+		return -EINVAL;
 
-	ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup);
+	ret = acpi_gpio_property_lookup(fwnode, propname, lookup);
 	if (ret)
-		return ERR_PTR(ret);
+		return ret;
 
-	ret = acpi_gpio_resource_lookup(&lookup, info);
-	return ret ? ERR_PTR(ret) : lookup.desc;
+	return acpi_gpio_resource_lookup(lookup);
 }
 
 static bool acpi_can_fallback_to_crs(struct acpi_device *adev,
@@ -982,17 +966,24 @@ __acpi_find_gpio(struct fwnode_handle *fwnode, const char *con_id, unsigned int
 		 bool can_fallback, struct acpi_gpio_info *info)
 {
 	struct acpi_device *adev = to_acpi_device_node(fwnode);
+	struct acpi_gpio_lookup lookup;
 	struct gpio_desc *desc;
 	char propname[32];
+	int ret;
+
+	memset(&lookup, 0, sizeof(lookup));
+	lookup.params.crs_entry_index = idx;
 
 	/* Try first from _DSD */
 	for_each_gpio_property_name(propname, con_id) {
 		if (adev)
-			desc = acpi_get_gpiod_by_index(adev,
-						       propname, idx, info);
+			ret = acpi_get_gpiod_by_index(adev, propname, &lookup);
 		else
-			desc = acpi_get_gpiod_from_data(fwnode,
-							propname, idx, info);
+			ret = acpi_get_gpiod_from_data(fwnode, propname, &lookup);
+		if (ret)
+			continue;
+
+		desc = lookup.desc;
 		if (PTR_ERR(desc) == -EPROBE_DEFER)
 			return desc;
 
@@ -1001,8 +992,13 @@ __acpi_find_gpio(struct fwnode_handle *fwnode, const char *con_id, unsigned int
 	}
 
 	/* Then from plain _CRS GPIOs */
-	if (can_fallback)
-		return acpi_get_gpiod_by_index(adev, NULL, idx, info);
+	if (can_fallback) {
+		ret = acpi_get_gpiod_by_index(adev, NULL, &lookup);
+		if (ret)
+			return ERR_PTR(ret);
+
+		return lookup.desc;
+	}
 
 	return ERR_PTR(-ENOENT);
 }

include/linux/gpio/consumer.h

@@ -587,7 +587,7 @@ struct gpio_desc *devm_fwnode_gpiod_get(struct device *dev,
 
 struct acpi_gpio_params {
 	unsigned int crs_entry_index;
-	unsigned int line_index;
+	unsigned short line_index;
 	bool active_low;
 };