ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/drivers/gpu/drm/i915/intel_wakeref.h b/marvell/linux/drivers/gpu/drm/i915/intel_wakeref.h
new file mode 100644
index 0000000..5f0c972
--- /dev/null
+++ b/marvell/linux/drivers/gpu/drm/i915/intel_wakeref.h
@@ -0,0 +1,219 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2019 Intel Corporation
+ */
+
+#ifndef INTEL_WAKEREF_H
+#define INTEL_WAKEREF_H
+
+#include <linux/atomic.h>
+#include <linux/bits.h>
+#include <linux/mutex.h>
+#include <linux/refcount.h>
+#include <linux/stackdepot.h>
+#include <linux/timer.h>
+#include <linux/workqueue.h>
+
+#if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
+#define INTEL_WAKEREF_BUG_ON(expr) BUG_ON(expr)
+#else
+#define INTEL_WAKEREF_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr)
+#endif
+
+struct intel_runtime_pm;
+struct intel_wakeref;
+
+typedef depot_stack_handle_t intel_wakeref_t;
+
+struct intel_wakeref_ops {
+ int (*get)(struct intel_wakeref *wf);
+ int (*put)(struct intel_wakeref *wf);
+
+ unsigned long flags;
+#define INTEL_WAKEREF_PUT_ASYNC BIT(0)
+};
+
+struct intel_wakeref {
+ atomic_t count;
+ struct mutex mutex;
+
+ intel_wakeref_t wakeref;
+
+ struct intel_runtime_pm *rpm;
+ const struct intel_wakeref_ops *ops;
+
+ struct work_struct work;
+};
+
+void __intel_wakeref_init(struct intel_wakeref *wf,
+ struct intel_runtime_pm *rpm,
+ const struct intel_wakeref_ops *ops,
+ struct lock_class_key *key);
+#define intel_wakeref_init(wf, rpm, ops) do { \
+ static struct lock_class_key __key; \
+ \
+ __intel_wakeref_init((wf), (rpm), (ops), &__key); \
+} while (0)
+
+int __intel_wakeref_get_first(struct intel_wakeref *wf);
+void __intel_wakeref_put_last(struct intel_wakeref *wf);
+
+/**
+ * intel_wakeref_get: Acquire the wakeref
+ * @i915: the drm_i915_private device
+ * @wf: the wakeref
+ * @fn: callback for acquired the wakeref, called only on first acquire.
+ *
+ * Acquire a hold on the wakeref. The first user to do so, will acquire
+ * the runtime pm wakeref and then call the @fn underneath the wakeref
+ * mutex.
+ *
+ * Note that @fn is allowed to fail, in which case the runtime-pm wakeref
+ * will be released and the acquisition unwound, and an error reported.
+ *
+ * Returns: 0 if the wakeref was acquired successfully, or a negative error
+ * code otherwise.
+ */
+static inline int
+intel_wakeref_get(struct intel_wakeref *wf)
+{
+ if (unlikely(!atomic_inc_not_zero(&wf->count)))
+ return __intel_wakeref_get_first(wf);
+
+ return 0;
+}
+
+/**
+ * intel_wakeref_get_if_in_use: Acquire the wakeref
+ * @wf: the wakeref
+ *
+ * Acquire a hold on the wakeref, but only if the wakeref is already
+ * active.
+ *
+ * Returns: true if the wakeref was acquired, false otherwise.
+ */
+static inline bool
+intel_wakeref_get_if_active(struct intel_wakeref *wf)
+{
+ return atomic_inc_not_zero(&wf->count);
+}
+
+/**
+ * intel_wakeref_put: Release the wakeref
+ * @i915: the drm_i915_private device
+ * @wf: the wakeref
+ * @fn: callback for releasing the wakeref, called only on final release.
+ *
+ * Release our hold on the wakeref. When there are no more users,
+ * the runtime pm wakeref will be released after the @fn callback is called
+ * underneath the wakeref mutex.
+ *
+ * Note that @fn is allowed to fail, in which case the runtime-pm wakeref
+ * is retained and an error reported.
+ *
+ * Returns: 0 if the wakeref was released successfully, or a negative error
+ * code otherwise.
+ */
+static inline void
+intel_wakeref_put(struct intel_wakeref *wf)
+{
+ INTEL_WAKEREF_BUG_ON(atomic_read(&wf->count) <= 0);
+ if (unlikely(!atomic_add_unless(&wf->count, -1, 1)))
+ __intel_wakeref_put_last(wf);
+}
+
+/**
+ * intel_wakeref_lock: Lock the wakeref (mutex)
+ * @wf: the wakeref
+ *
+ * Locks the wakeref to prevent it being acquired or released. New users
+ * can still adjust the counter, but the wakeref itself (and callback)
+ * cannot be acquired or released.
+ */
+static inline void
+intel_wakeref_lock(struct intel_wakeref *wf)
+ __acquires(wf->mutex)
+{
+ mutex_lock(&wf->mutex);
+}
+
+/**
+ * intel_wakeref_unlock: Unlock the wakeref
+ * @wf: the wakeref
+ *
+ * Releases a previously acquired intel_wakeref_lock().
+ */
+static inline void
+intel_wakeref_unlock(struct intel_wakeref *wf)
+ __releases(wf->mutex)
+{
+ mutex_unlock(&wf->mutex);
+}
+
+/**
+ * intel_wakeref_is_active: Query whether the wakeref is currently held
+ * @wf: the wakeref
+ *
+ * Returns: true if the wakeref is currently held.
+ */
+static inline bool
+intel_wakeref_is_active(const struct intel_wakeref *wf)
+{
+ return READ_ONCE(wf->wakeref);
+}
+
+/**
+ * __intel_wakeref_defer_park: Defer the current park callback
+ * @wf: the wakeref
+ */
+static inline void
+__intel_wakeref_defer_park(struct intel_wakeref *wf)
+{
+ INTEL_WAKEREF_BUG_ON(atomic_read(&wf->count));
+ atomic_set_release(&wf->count, 1);
+}
+
+/**
+ * intel_wakeref_wait_for_idle: Wait until the wakeref is idle
+ * @wf: the wakeref
+ *
+ * Wait for the earlier asynchronous release of the wakeref. Note
+ * this will wait for any third party as well, so make sure you only wait
+ * when you have control over the wakeref and trust no one else is acquiring
+ * it.
+ *
+ * Return: 0 on success, error code if killed.
+ */
+int intel_wakeref_wait_for_idle(struct intel_wakeref *wf);
+
+struct intel_wakeref_auto {
+ struct intel_runtime_pm *rpm;
+ struct timer_list timer;
+ intel_wakeref_t wakeref;
+ spinlock_t lock;
+ refcount_t count;
+};
+
+/**
+ * intel_wakeref_auto: Delay the runtime-pm autosuspend
+ * @wf: the wakeref
+ * @timeout: relative timeout in jiffies
+ *
+ * The runtime-pm core uses a suspend delay after the last wakeref
+ * is released before triggering runtime suspend of the device. That
+ * delay is configurable via sysfs with little regard to the device
+ * characteristics. Instead, we want to tune the autosuspend based on our
+ * HW knowledge. intel_wakeref_auto() delays the sleep by the supplied
+ * timeout.
+ *
+ * Pass @timeout = 0 to cancel a previous autosuspend by executing the
+ * suspend immediately.
+ */
+void intel_wakeref_auto(struct intel_wakeref_auto *wf, unsigned long timeout);
+
+void intel_wakeref_auto_init(struct intel_wakeref_auto *wf,
+ struct intel_runtime_pm *rpm);
+void intel_wakeref_auto_fini(struct intel_wakeref_auto *wf);
+
+#endif /* INTEL_WAKEREF_H */