mirror of
https://github.com/armbian/build.git
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136 lines
4.2 KiB
Diff
136 lines
4.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jianhua Lu <lujianhua000@gmail.com>
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Date: Thu, 4 Aug 2022 13:26:53 +0800
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Subject: drm: Add drm notifier support
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---
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drivers/gpu/drm/Makefile | 3 +-
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drivers/gpu/drm/drm_notifier.c | 57 ++++++++++
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include/drm/drm_notifier.h | 37 ++++++
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3 files changed, 96 insertions(+), 1 deletion(-)
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diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
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index 7a09a89b493b..8e18dbb6986c 100644
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--- a/drivers/gpu/drm/Makefile
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+++ b/drivers/gpu/drm/Makefile
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@@ -45,7 +45,8 @@ drm-y := \
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drm_vblank.o \
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drm_vblank_work.o \
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drm_vma_manager.o \
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- drm_writeback.o
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+ drm_writeback.o \
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+ drm_notifier.o
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drm-$(CONFIG_DRM_LEGACY) += \
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drm_agpsupport.o \
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drm_bufs.o \
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diff --git a/drivers/gpu/drm/drm_notifier.c b/drivers/gpu/drm/drm_notifier.c
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new file mode 100644
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index 000000000000..792069640ea7
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--- /dev/null
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+++ b/drivers/gpu/drm/drm_notifier.c
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@@ -0,0 +1,57 @@
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+/*
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+ * Copyright (c) 2019, The Linux Foundation. All rights reserved.
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+ * Copyright (C) 2021 XiaoMi, Inc.
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 and
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+ * only version 2 as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ */
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+
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+#include <linux/notifier.h>
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+
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+static BLOCKING_NOTIFIER_HEAD(mi_drm_notifier_list);
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+
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+/**
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+ * mi_drm_register_client - register a client notifier
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+ * @nb: notifier block to callback on events
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+ *
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+ * This function registers a notifier callback function
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+ * to msm_drm_notifier_list, which would be called when
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+ * received unblank/power down event.
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+ */
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+int mi_drm_register_client(struct notifier_block *nb)
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+{
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+ return blocking_notifier_chain_register(&mi_drm_notifier_list, nb);
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+}
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+EXPORT_SYMBOL(mi_drm_register_client);
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+
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+/**
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+ * mi_drm_unregister_client - unregister a client notifier
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+ * @nb: notifier block to callback on events
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+ *
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+ * This function unregisters the callback function from
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+ * msm_drm_notifier_list.
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+ */
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+int mi_drm_unregister_client(struct notifier_block *nb)
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+{
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+ return blocking_notifier_chain_unregister(&mi_drm_notifier_list, nb);
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+}
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+EXPORT_SYMBOL(mi_drm_unregister_client);
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+
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+/**
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+ * mi_drm_notifier_call_chain - notify clients of drm_events
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+ * @val: event MSM_DRM_EARLY_EVENT_BLANK or MSM_DRM_EVENT_BLANK
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+ * @v: notifier data, inculde display id and display blank
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+ * event(unblank or power down).
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+ */
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+int mi_drm_notifier_call_chain(unsigned long val, void *v)
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+{
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+ return blocking_notifier_call_chain(&mi_drm_notifier_list, val, v);
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+}
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+EXPORT_SYMBOL(mi_drm_notifier_call_chain);
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\ No newline at end of file
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diff --git a/include/drm/drm_notifier.h b/include/drm/drm_notifier.h
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new file mode 100644
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index 000000000000..fd0e976559b8
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--- /dev/null
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+++ b/include/drm/drm_notifier.h
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@@ -0,0 +1,37 @@
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+/*
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+ * Copyright (c) 2019, The Linux Foundation. All rights reserved.
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+ * Copyright (C) 2021 XiaoMi, Inc.
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 and
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+ * only version 2 as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ */
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+
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+#ifndef _DRM_NOTIFIER_H_
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+#define _DRM_NOTIFIER_H_
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+
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+#include <linux/notifier.h>
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+
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+/* A hardware display blank change occurred */
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+#define MI_DRM_EVENT_BLANK 0x01
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+/* A hardware display blank early change occurred */
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+#define MI_DRM_EARLY_EVENT_BLANK 0x02
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+
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+enum drm_notifier_data {
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+ /* panel: power on */
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+ MI_DRM_BLANK_UNBLANK,
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+ /* panel: power down */
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+ MI_DRM_BLANK_POWERDOWN,
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+};
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+
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+int mi_drm_register_client(struct notifier_block *nb);
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+int mi_drm_unregister_client(struct notifier_block *nb);
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+int mi_drm_notifier_call_chain(unsigned long val, void *v);
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+
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+#endif /* _DRM_NOTIFIER_H */
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--
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Armbian
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