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-rw-r--r--target/linux/sunxi/patches-4.4/143-reset-add-shared-resetcontrol-asserts.patch265
1 files changed, 0 insertions, 265 deletions
diff --git a/target/linux/sunxi/patches-4.4/143-reset-add-shared-resetcontrol-asserts.patch b/target/linux/sunxi/patches-4.4/143-reset-add-shared-resetcontrol-asserts.patch
deleted file mode 100644
index e1078e9696..0000000000
--- a/target/linux/sunxi/patches-4.4/143-reset-add-shared-resetcontrol-asserts.patch
+++ /dev/null
@@ -1,265 +0,0 @@
-From d25cfe9b4f9663216ce4e011e3f1e7fa669ab58a Mon Sep 17 00:00:00 2001
-From: Hans de Goede <hdegoede@redhat.com>
-Date: Fri, 27 Nov 2015 21:09:05 +0100
-Subject: [PATCH] reset: Add shared reset_control_[de]assert variants
-
-Add reset_control_deassert_shared / reset_control_assert_shared
-functions which are intended for use by drivers for hw blocks which
-(may) share a reset line with another driver / hw block.
-
-Unlike the regular reset_control_[de]assert functions these functions
-keep track of how often deassert_shared / assert_shared have been called
-and keep the line deasserted as long as deassert has been called more
-times than assert.
-
-Signed-off-by: Hans de Goede <hdegoede@redhat.com>
----
-Changes in v2:
--This is a new patch in v2 of this patch-set
----
- drivers/reset/core.c | 121 ++++++++++++++++++++++++++++++++++++---
- include/linux/reset-controller.h | 2 +
- include/linux/reset.h | 2 +
- 3 files changed, 116 insertions(+), 9 deletions(-)
-
---- a/drivers/reset/core.c
-+++ b/drivers/reset/core.c
-@@ -22,16 +22,29 @@ static DEFINE_MUTEX(reset_controller_lis
- static LIST_HEAD(reset_controller_list);
-
- /**
-+ * struct reset_line - a reset line
-+ * @list: list entry for the reset controllers reset line list
-+ * @id: ID of the reset line in the reset controller device
-+ * @refcnt: Number of reset_control structs referencing this device
-+ * @deassert_cnt: Number of times this reset line has been deasserted
-+ */
-+struct reset_line {
-+ struct list_head list;
-+ unsigned int id;
-+ unsigned int refcnt;
-+ unsigned int deassert_cnt;
-+};
-+
-+/**
- * struct reset_control - a reset control
- * @rcdev: a pointer to the reset controller device
- * this reset control belongs to
-- * @id: ID of the reset controller in the reset
-- * controller device
-+ * @line: reset line for this reset control
- */
- struct reset_control {
- struct reset_controller_dev *rcdev;
-+ struct reset_line *line;
- struct device *dev;
-- unsigned int id;
- };
-
- /**
-@@ -66,6 +79,8 @@ int reset_controller_register(struct res
- rcdev->of_xlate = of_reset_simple_xlate;
- }
-
-+ INIT_LIST_HEAD(&rcdev->reset_line_head);
-+
- mutex_lock(&reset_controller_list_mutex);
- list_add(&rcdev->list, &reset_controller_list);
- mutex_unlock(&reset_controller_list_mutex);
-@@ -93,7 +108,7 @@ EXPORT_SYMBOL_GPL(reset_controller_unreg
- int reset_control_reset(struct reset_control *rstc)
- {
- if (rstc->rcdev->ops->reset)
-- return rstc->rcdev->ops->reset(rstc->rcdev, rstc->id);
-+ return rstc->rcdev->ops->reset(rstc->rcdev, rstc->line->id);
-
- return -ENOTSUPP;
- }
-@@ -106,7 +121,7 @@ EXPORT_SYMBOL_GPL(reset_control_reset);
- int reset_control_assert(struct reset_control *rstc)
- {
- if (rstc->rcdev->ops->assert)
-- return rstc->rcdev->ops->assert(rstc->rcdev, rstc->id);
-+ return rstc->rcdev->ops->assert(rstc->rcdev, rstc->line->id);
-
- return -ENOTSUPP;
- }
-@@ -119,13 +134,55 @@ EXPORT_SYMBOL_GPL(reset_control_assert);
- int reset_control_deassert(struct reset_control *rstc)
- {
- if (rstc->rcdev->ops->deassert)
-- return rstc->rcdev->ops->deassert(rstc->rcdev, rstc->id);
-+ return rstc->rcdev->ops->deassert(rstc->rcdev, rstc->line->id);
-
- return -ENOTSUPP;
- }
- EXPORT_SYMBOL_GPL(reset_control_deassert);
-
- /**
-+ * reset_control_assert_shared - asserts a shared reset line
-+ * @rstc: reset controller
-+ *
-+ * Assert a shared reset line, this functions decreases the deassert count
-+ * of the line by one and asserts it if, and only if, the deassert count
-+ * reaches 0.
-+ */
-+int reset_control_assert_shared(struct reset_control *rstc)
-+{
-+ if (!rstc->rcdev->ops->assert)
-+ return -ENOTSUPP;
-+
-+ rstc->line->deassert_cnt--;
-+ if (rstc->line->deassert_cnt)
-+ return 0;
-+
-+ return rstc->rcdev->ops->assert(rstc->rcdev, rstc->line->id);
-+}
-+EXPORT_SYMBOL_GPL(reset_control_assert_shared);
-+
-+/**
-+ * reset_control_deassert_shared - deasserts a shared reset line
-+ * @rstc: reset controller
-+ *
-+ * Assert a shared reset line, this functions increases the deassert count
-+ * of the line by one and deasserts the reset line (if it was not already
-+ * deasserted).
-+ */
-+int reset_control_deassert_shared(struct reset_control *rstc)
-+{
-+ if (!rstc->rcdev->ops->deassert)
-+ return -ENOTSUPP;
-+
-+ rstc->line->deassert_cnt++;
-+ if (rstc->line->deassert_cnt != 1)
-+ return 0;
-+
-+ return rstc->rcdev->ops->deassert(rstc->rcdev, rstc->line->id);
-+}
-+EXPORT_SYMBOL_GPL(reset_control_deassert_shared);
-+
-+/**
- * reset_control_status - returns a negative errno if not supported, a
- * positive value if the reset line is asserted, or zero if the reset
- * line is not asserted.
-@@ -134,12 +191,47 @@ EXPORT_SYMBOL_GPL(reset_control_deassert
- int reset_control_status(struct reset_control *rstc)
- {
- if (rstc->rcdev->ops->status)
-- return rstc->rcdev->ops->status(rstc->rcdev, rstc->id);
-+ return rstc->rcdev->ops->status(rstc->rcdev, rstc->line->id);
-
- return -ENOTSUPP;
- }
- EXPORT_SYMBOL_GPL(reset_control_status);
-
-+static struct reset_line *reset_line_get(struct reset_controller_dev *rcdev,
-+ unsigned int index)
-+{
-+ struct reset_line *line;
-+
-+ list_for_each_entry(line, &rcdev->reset_line_head, list) {
-+ if (line->id == index) {
-+ line->refcnt++;
-+ return line;
-+ }
-+ }
-+
-+ line = kzalloc(sizeof(*line), GFP_KERNEL);
-+ if (!line)
-+ return NULL;
-+
-+ list_add(&line->list, &rcdev->reset_line_head);
-+ line->id = index;
-+ line->refcnt = 1;
-+
-+ return line;
-+}
-+
-+static void reset_line_put(struct reset_line *line)
-+{
-+ if (!line)
-+ return;
-+
-+ if (--line->refcnt)
-+ return;
-+
-+ list_del(&line->list);
-+ kfree(line);
-+}
-+
- /**
- * of_reset_control_get_by_index - Lookup and obtain a reference to a reset
- * controller by index.
-@@ -155,6 +247,7 @@ struct reset_control *of_reset_control_g
- {
- struct reset_control *rstc = ERR_PTR(-EPROBE_DEFER);
- struct reset_controller_dev *r, *rcdev;
-+ struct reset_line *line;
- struct of_phandle_args args;
- int rstc_id;
- int ret;
-@@ -186,16 +279,22 @@ struct reset_control *of_reset_control_g
- }
-
- try_module_get(rcdev->owner);
-+
-+ /* reset_controller_list_mutex also protects the reset_line list */
-+ line = reset_line_get(rcdev, rstc_id);
-+
- mutex_unlock(&reset_controller_list_mutex);
-
- rstc = kzalloc(sizeof(*rstc), GFP_KERNEL);
-- if (!rstc) {
-+ if (!line || !rstc) {
-+ kfree(rstc);
-+ reset_line_put(line);
- module_put(rcdev->owner);
- return ERR_PTR(-ENOMEM);
- }
-
- rstc->rcdev = rcdev;
-- rstc->id = rstc_id;
-+ rstc->line = line;
-
- return rstc;
- }
-@@ -259,6 +358,10 @@ void reset_control_put(struct reset_cont
- if (IS_ERR(rstc))
- return;
-
-+ mutex_lock(&reset_controller_list_mutex);
-+ reset_line_put(rstc->line);
-+ mutex_unlock(&reset_controller_list_mutex);
-+
- module_put(rstc->rcdev->owner);
- kfree(rstc);
- }
---- a/include/linux/reset-controller.h
-+++ b/include/linux/reset-controller.h
-@@ -31,6 +31,7 @@ struct of_phandle_args;
- * @ops: a pointer to device specific struct reset_control_ops
- * @owner: kernel module of the reset controller driver
- * @list: internal list of reset controller devices
-+ * @reset_line_head: head of internal list of reset lines
- * @of_node: corresponding device tree node as phandle target
- * @of_reset_n_cells: number of cells in reset line specifiers
- * @of_xlate: translation function to translate from specifier as found in the
-@@ -41,6 +42,7 @@ struct reset_controller_dev {
- struct reset_control_ops *ops;
- struct module *owner;
- struct list_head list;
-+ struct list_head reset_line_head;
- struct device_node *of_node;
- int of_reset_n_cells;
- int (*of_xlate)(struct reset_controller_dev *rcdev,
---- a/include/linux/reset.h
-+++ b/include/linux/reset.h
-@@ -11,6 +11,8 @@ int reset_control_reset(struct reset_con
- int reset_control_assert(struct reset_control *rstc);
- int reset_control_deassert(struct reset_control *rstc);
- int reset_control_status(struct reset_control *rstc);
-+int reset_control_assert_shared(struct reset_control *rstc);
-+int reset_control_deassert_shared(struct reset_control *rstc);
-
- struct reset_control *reset_control_get(struct device *dev, const char *id);
- void reset_control_put(struct reset_control *rstc);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-14 05:02:54 +0000