drm/exynos: ipp: Remove Exynos DRM IPP subsystem

Exynos DRM IPP subsystem is in fact non-functional and frankly speaking
dead-code. This patch clearly marks that Exynos DRM IPP subsystem is
broken and never really functional. It will be replaced by a completely
rewritten API.

Exynos DRM IPP user-space API can be obsoleted for the following
reasons:

1. Exynos DRM IPP user-space API can be optional in Exynos DRM, so
userspace should not rely that it is always available and should have
a software fallback in case it is not there.

2. The only mode which was initially semi-working was memory-to-memory
image processing. The remaining modes (LCD-"writeback" and "output")
were never operational due to missing code (both in mainline and even
vendor kernels).

3. Exynos DRM IPP mainline user-space API compatibility for
memory-to-memory got broken very early by commit 083500baefd5 ("drm:
remove DRM_FORMAT_NV12MT", which removed the support for tiled formats,
the main feature which made this API somehow useful on Exynos platforms
(video codec that time produced only tiled frames, to implement xvideo
or any other video overlay, one has to de-tile them for proper
display).

4. Broken drivers. Especially once support for IOMMU has been added,
it revealed that drivers don't configure DMA operations properly and in
many cases operate outside the provided buffers trashing memory around.

5. Need for external patches. Although IPP user-space API has been used
in some vendor kernels, but in such cases there were additional patches
applied (like reverting mentioned 083500baefd5 patch) what means that
those userspace apps which might use it, still won't work with the
mainline kernel version.

We don't have time machines, so we cannot change it, but Exynos DRM IPP
extension should never have been merged to mainline in that form.

Exynos IPP subsystem and user-space API will be rewritten, so remove
current IPP core code and mark existing drivers as BROKEN.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Daniel Stone <daniels@collabora.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

1 files changed, 0 insertions, 252 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_ipp.h b/drivers/gpu/drm/exynos/exynos_drm_ipp.h
deleted file mode 100644
index 2a61547a39d0..000000000000
--- a/drivers/gpu/drm/exynos/exynos_drm_ipp.h
+++ /dev/null
@@ -1,252 +0,0 @@
-/*
- * Copyright (c) 2012 Samsung Electronics Co., Ltd.
- *
- * Authors:
- *	Eunchul Kim <chulspro.kim@samsung.com>
- *	Jinyoung Jeon <jy0.jeon@samsung.com>
- *	Sangmin Lee <lsmin.lee@samsung.com>
- *
- * This program is free software; you can redistribute  it and/or modify it
- * under  the terms of  the GNU General  Public License as published by the
- * Free Software Foundation;  either version 2 of the  License, or (at your
- * option) any later version.
- */
-
-#ifndef _EXYNOS_DRM_IPP_H_
-#define _EXYNOS_DRM_IPP_H_
-
-#define for_each_ipp_ops(pos)	\
-	for (pos = 0; pos < EXYNOS_DRM_OPS_MAX; pos++)
-#define for_each_ipp_planar(pos)	\
-	for (pos = 0; pos < EXYNOS_DRM_PLANAR_MAX; pos++)
-
-#define IPP_GET_LCD_WIDTH	_IOR('F', 302, int)
-#define IPP_GET_LCD_HEIGHT	_IOR('F', 303, int)
-#define IPP_SET_WRITEBACK	_IOW('F', 304, u32)
-
-/* definition of state */
-enum drm_exynos_ipp_state {
-	IPP_STATE_IDLE,
-	IPP_STATE_START,
-	IPP_STATE_STOP,
-};
-
-/*
- * A structure of command work information.
- * @work: work structure.
- * @ippdrv: current work ippdrv.
- * @c_node: command node information.
- * @ctrl: command control.
- */
-struct drm_exynos_ipp_cmd_work {
-	struct work_struct	work;
-	struct exynos_drm_ippdrv	*ippdrv;
-	struct drm_exynos_ipp_cmd_node *c_node;
-	enum drm_exynos_ipp_ctrl	ctrl;
-};
-
-/*
- * A structure of command node.
- *
- * @list: list head to command queue information.
- * @event_list: list head of event.
- * @mem_list: list head to source,destination memory queue information.
- * @lock: lock for synchronization of access to ioctl.
- * @mem_lock: lock for synchronization of access to memory nodes.
- * @event_lock: lock for synchronization of access to scheduled event.
- * @start_complete: completion of start of command.
- * @stop_complete: completion of stop of command.
- * @property: property information.
- * @start_work: start command work structure.
- * @stop_work: stop command work structure.
- * @event_work: event work structure.
- * @state: state of command node.
- * @filp: associated file pointer.
- */
-struct drm_exynos_ipp_cmd_node {
-	struct list_head	list;
-	struct list_head	event_list;
-	struct list_head	mem_list[EXYNOS_DRM_OPS_MAX];
-	struct mutex	lock;
-	struct mutex	mem_lock;
-	struct mutex	event_lock;
-	struct completion	start_complete;
-	struct completion	stop_complete;
-	struct drm_exynos_ipp_property	property;
-	struct drm_exynos_ipp_cmd_work *start_work;
-	struct drm_exynos_ipp_cmd_work *stop_work;
-	struct drm_exynos_ipp_event_work *event_work;
-	enum drm_exynos_ipp_state	state;
-	struct drm_file	*filp;
-};
-
-/*
- * A structure of buffer information.
- *
- * @handles: Y, Cb, Cr each gem object handle.
- * @base: Y, Cb, Cr each planar address.
- */
-struct drm_exynos_ipp_buf_info {
-	unsigned long	handles[EXYNOS_DRM_PLANAR_MAX];
-	dma_addr_t	base[EXYNOS_DRM_PLANAR_MAX];
-};
-
-/*
- * A structure of wb setting information.
- *
- * @enable: enable flag for wb.
- * @refresh: HZ of the refresh rate.
- */
-struct drm_exynos_ipp_set_wb {
-	__u32	enable;
-	__u32	refresh;
-};
-
-/*
- * A structure of event work information.
- *
- * @work: work structure.
- * @ippdrv: current work ippdrv.
- * @buf_id: id of src, dst buffer.
- */
-struct drm_exynos_ipp_event_work {
-	struct work_struct	work;
-	struct exynos_drm_ippdrv *ippdrv;
-	u32	buf_id[EXYNOS_DRM_OPS_MAX];
-};
-
-/*
- * A structure of source,destination operations.
- *
- * @set_fmt: set format of image.
- * @set_transf: set transform(rotations, flip).
- * @set_size: set size of region.
- * @set_addr: set address for dma.
- */
-struct exynos_drm_ipp_ops {
-	int (*set_fmt)(struct device *dev, u32 fmt);
-	int (*set_transf)(struct device *dev,
-		enum drm_exynos_degree degree,
-		enum drm_exynos_flip flip, bool *swap);
-	int (*set_size)(struct device *dev, int swap,
-		struct drm_exynos_pos *pos, struct drm_exynos_sz *sz);
-	int (*set_addr)(struct device *dev,
-		 struct drm_exynos_ipp_buf_info *buf_info, u32 buf_id,
-		enum drm_exynos_ipp_buf_type buf_type);
-};
-
-/*
- * A structure of ipp driver.
- *
- * @drv_list: list head for registed sub driver information.
- * @parent_dev: parent device information.
- * @dev: platform device.
- * @drm_dev: drm device.
- * @dedicated: dedicated ipp device.
- * @ops: source, destination operations.
- * @event_workq: event work queue.
- * @c_node: current command information.
- * @cmd_list: list head for command information.
- * @cmd_lock: lock for synchronization of access to cmd_list.
- * @prop_list: property informations of current ipp driver.
- * @check_property: check property about format, size, buffer.
- * @reset: reset ipp block.
- * @start: ipp each device start.
- * @stop: ipp each device stop.
- * @sched_event: work schedule handler.
- */
-struct exynos_drm_ippdrv {
-	struct list_head	drv_list;
-	struct device	*parent_dev;
-	struct device	*dev;
-	struct drm_device	*drm_dev;
-	bool	dedicated;
-	struct exynos_drm_ipp_ops	*ops[EXYNOS_DRM_OPS_MAX];
-	struct workqueue_struct	*event_workq;
-	struct drm_exynos_ipp_cmd_node *c_node;
-	struct list_head	cmd_list;
-	struct mutex	cmd_lock;
-	struct drm_exynos_ipp_prop_list prop_list;
-
-	int (*check_property)(struct device *dev,
-		struct drm_exynos_ipp_property *property);
-	int (*reset)(struct device *dev);
-	int (*start)(struct device *dev, enum drm_exynos_ipp_cmd cmd);
-	void (*stop)(struct device *dev, enum drm_exynos_ipp_cmd cmd);
-	void (*sched_event)(struct work_struct *work);
-};
-
-#ifdef CONFIG_DRM_EXYNOS_IPP
-extern int exynos_drm_ippdrv_register(struct exynos_drm_ippdrv *ippdrv);
-extern int exynos_drm_ippdrv_unregister(struct exynos_drm_ippdrv *ippdrv);
-extern int exynos_drm_ipp_get_property(struct drm_device *drm_dev, void *data,
-					 struct drm_file *file);
-extern int exynos_drm_ipp_set_property(struct drm_device *drm_dev, void *data,
-					 struct drm_file *file);
-extern int exynos_drm_ipp_queue_buf(struct drm_device *drm_dev, void *data,
-					 struct drm_file *file);
-extern int exynos_drm_ipp_cmd_ctrl(struct drm_device *drm_dev, void *data,
-					 struct drm_file *file);
-extern int exynos_drm_ippnb_register(struct notifier_block *nb);
-extern int exynos_drm_ippnb_unregister(struct notifier_block *nb);
-extern int exynos_drm_ippnb_send_event(unsigned long val, void *v);
-extern void ipp_sched_cmd(struct work_struct *work);
-extern void ipp_sched_event(struct work_struct *work);
-
-#else
-static inline int exynos_drm_ippdrv_register(struct exynos_drm_ippdrv *ippdrv)
-{
-	return -ENODEV;
-}
-
-static inline int exynos_drm_ippdrv_unregister(struct exynos_drm_ippdrv *ippdrv)
-{
-	return -ENODEV;
-}
-
-static inline int exynos_drm_ipp_get_property(struct drm_device *drm_dev,
-						void *data,
-						struct drm_file *file_priv)
-{
-	return -ENOTTY;
-}
-
-static inline int exynos_drm_ipp_set_property(struct drm_device *drm_dev,
-						void *data,
-						struct drm_file *file_priv)
-{
-	return -ENOTTY;
-}
-
-static inline int exynos_drm_ipp_queue_buf(struct drm_device *drm_dev,
-						void *data,
-						struct drm_file *file)
-{
-	return -ENOTTY;
-}
-
-static inline int exynos_drm_ipp_cmd_ctrl(struct drm_device *drm_dev,
-						void *data,
-						struct drm_file *file)
-{
-	return -ENOTTY;
-}
-
-static inline int exynos_drm_ippnb_register(struct notifier_block *nb)
-{
-	return -ENODEV;
-}
-
-static inline int exynos_drm_ippnb_unregister(struct notifier_block *nb)
-{
-	return -ENODEV;
-}
-
-static inline int exynos_drm_ippnb_send_event(unsigned long val, void *v)
-{
-	return -ENOTTY;
-}
-#endif
-
-#endif /* _EXYNOS_DRM_IPP_H_ */
-