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alistair23-linux/drivers/gpu/drm/exynos/exynos_drm_drv.h
Marek Szyprowski 8ded59413c 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 083500baef ("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 083500baef 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>
2018-01-02 08:41:22 +09:00

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/* exynos_drm_drv.h
*
* Copyright (c) 2011 Samsung Electronics Co., Ltd.
* Authors:
* Inki Dae <inki.dae@samsung.com>
* Joonyoung Shim <jy0922.shim@samsung.com>
* Seung-Woo Kim <sw0312.kim@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_DRV_H_
#define _EXYNOS_DRM_DRV_H_
#include <drm/drmP.h>
#include <linux/module.h>
#define MAX_CRTC 3
#define MAX_PLANE 5
#define MAX_FB_BUFFER 4
#define DEFAULT_WIN 0
#define to_exynos_crtc(x) container_of(x, struct exynos_drm_crtc, base)
#define to_exynos_plane(x) container_of(x, struct exynos_drm_plane, base)
/* this enumerates display type. */
enum exynos_drm_output_type {
EXYNOS_DISPLAY_TYPE_NONE,
/* RGB or CPU Interface. */
EXYNOS_DISPLAY_TYPE_LCD,
/* HDMI Interface. */
EXYNOS_DISPLAY_TYPE_HDMI,
/* Virtual Display Interface. */
EXYNOS_DISPLAY_TYPE_VIDI,
};
struct exynos_drm_rect {
unsigned int x, y;
unsigned int w, h;
};
/*
* Exynos drm plane state structure.
*
* @base: plane_state object (contains drm_framebuffer pointer)
* @src: rectangle of the source image data to be displayed (clipped to
* visible part).
* @crtc: rectangle of the target image position on hardware screen
* (clipped to visible part).
* @h_ratio: horizontal scaling ratio, 16.16 fixed point
* @v_ratio: vertical scaling ratio, 16.16 fixed point
*
* this structure consists plane state data that will be applied to hardware
* specific overlay info.
*/
struct exynos_drm_plane_state {
struct drm_plane_state base;
struct exynos_drm_rect crtc;
struct exynos_drm_rect src;
unsigned int h_ratio;
unsigned int v_ratio;
};
static inline struct exynos_drm_plane_state *
to_exynos_plane_state(struct drm_plane_state *state)
{
return container_of(state, struct exynos_drm_plane_state, base);
}
/*
* Exynos drm common overlay structure.
*
* @base: plane object
* @index: hardware index of the overlay layer
*
* this structure is common to exynos SoC and its contents would be copied
* to hardware specific overlay info.
*/
struct exynos_drm_plane {
struct drm_plane base;
const struct exynos_drm_plane_config *config;
unsigned int index;
};
#define EXYNOS_DRM_PLANE_CAP_DOUBLE (1 << 0)
#define EXYNOS_DRM_PLANE_CAP_SCALE (1 << 1)
#define EXYNOS_DRM_PLANE_CAP_ZPOS (1 << 2)
#define EXYNOS_DRM_PLANE_CAP_TILE (1 << 3)
/*
* Exynos DRM plane configuration structure.
*
* @zpos: initial z-position of the plane.
* @type: type of the plane (primary, cursor or overlay).
* @pixel_formats: supported pixel formats.
* @num_pixel_formats: number of elements in 'pixel_formats'.
* @capabilities: supported features (see EXYNOS_DRM_PLANE_CAP_*)
*/
struct exynos_drm_plane_config {
unsigned int zpos;
enum drm_plane_type type;
const uint32_t *pixel_formats;
unsigned int num_pixel_formats;
unsigned int capabilities;
};
/*
* Exynos drm crtc ops
*
* @enable: enable the device
* @disable: disable the device
* @enable_vblank: specific driver callback for enabling vblank interrupt.
* @disable_vblank: specific driver callback for disabling vblank interrupt.
* @mode_valid: specific driver callback for mode validation
* @atomic_check: validate state
* @atomic_begin: prepare device to receive an update
* @atomic_flush: mark the end of device update
* @update_plane: apply hardware specific overlay data to registers.
* @disable_plane: disable hardware specific overlay.
* @te_handler: trigger to transfer video image at the tearing effect
* synchronization signal if there is a page flip request.
*/
struct exynos_drm_crtc;
struct exynos_drm_crtc_ops {
void (*enable)(struct exynos_drm_crtc *crtc);
void (*disable)(struct exynos_drm_crtc *crtc);
int (*enable_vblank)(struct exynos_drm_crtc *crtc);
void (*disable_vblank)(struct exynos_drm_crtc *crtc);
u32 (*get_vblank_counter)(struct exynos_drm_crtc *crtc);
enum drm_mode_status (*mode_valid)(struct exynos_drm_crtc *crtc,
const struct drm_display_mode *mode);
bool (*mode_fixup)(struct exynos_drm_crtc *crtc,
const struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode);
int (*atomic_check)(struct exynos_drm_crtc *crtc,
struct drm_crtc_state *state);
void (*atomic_begin)(struct exynos_drm_crtc *crtc);
void (*update_plane)(struct exynos_drm_crtc *crtc,
struct exynos_drm_plane *plane);
void (*disable_plane)(struct exynos_drm_crtc *crtc,
struct exynos_drm_plane *plane);
void (*atomic_flush)(struct exynos_drm_crtc *crtc);
void (*te_handler)(struct exynos_drm_crtc *crtc);
};
struct exynos_drm_clk {
void (*enable)(struct exynos_drm_clk *clk, bool enable);
};
/*
* Exynos specific crtc structure.
*
* @base: crtc object.
* @type: one of EXYNOS_DISPLAY_TYPE_LCD and HDMI.
* @ops: pointer to callbacks for exynos drm specific functionality
* @ctx: A pointer to the crtc's implementation specific context
* @pipe_clk: A pointer to the crtc's pipeline clock.
*/
struct exynos_drm_crtc {
struct drm_crtc base;
enum exynos_drm_output_type type;
const struct exynos_drm_crtc_ops *ops;
void *ctx;
struct exynos_drm_clk *pipe_clk;
bool i80_mode : 1;
};
static inline void exynos_drm_pipe_clk_enable(struct exynos_drm_crtc *crtc,
bool enable)
{
if (crtc->pipe_clk)
crtc->pipe_clk->enable(crtc->pipe_clk, enable);
}
struct exynos_drm_g2d_private {
struct device *dev;
struct list_head inuse_cmdlist;
struct list_head event_list;
struct list_head userptr_list;
};
struct drm_exynos_file_private {
struct exynos_drm_g2d_private *g2d_priv;
};
/*
* Exynos drm private structure.
*
* @pending: the crtcs that have pending updates to finish
* @lock: protect access to @pending
* @wait: wait an atomic commit to finish
*/
struct exynos_drm_private {
struct drm_fb_helper *fb_helper;
struct drm_atomic_state *suspend_state;
struct device *dma_dev;
void *mapping;
/* for atomic commit */
u32 pending;
spinlock_t lock;
wait_queue_head_t wait;
};
static inline struct device *to_dma_dev(struct drm_device *dev)
{
struct exynos_drm_private *priv = dev->dev_private;
return priv->dma_dev;
}
/*
* Exynos drm sub driver structure.
*
* @list: sub driver has its own list object to register to exynos drm driver.
* @dev: pointer to device object for subdrv device driver.
* @drm_dev: pointer to drm_device and this pointer would be set
* when sub driver calls exynos_drm_subdrv_register().
* @probe: this callback would be called by exynos drm driver after
* subdrv is registered to it.
* @remove: this callback is used to release resources created
* by probe callback.
* @open: this would be called with drm device file open.
* @close: this would be called with drm device file close.
*/
struct exynos_drm_subdrv {
struct list_head list;
struct device *dev;
struct drm_device *drm_dev;
int (*probe)(struct drm_device *drm_dev, struct device *dev);
void (*remove)(struct drm_device *drm_dev, struct device *dev);
int (*open)(struct drm_device *drm_dev, struct device *dev,
struct drm_file *file);
void (*close)(struct drm_device *drm_dev, struct device *dev,
struct drm_file *file);
};
/* This function would be called by non kms drivers such as g2d and ipp. */
int exynos_drm_subdrv_register(struct exynos_drm_subdrv *drm_subdrv);
/* this function removes subdrv list from exynos drm driver */
int exynos_drm_subdrv_unregister(struct exynos_drm_subdrv *drm_subdrv);
int exynos_drm_device_subdrv_probe(struct drm_device *dev);
int exynos_drm_device_subdrv_remove(struct drm_device *dev);
int exynos_drm_subdrv_open(struct drm_device *dev, struct drm_file *file);
void exynos_drm_subdrv_close(struct drm_device *dev, struct drm_file *file);
#ifdef CONFIG_DRM_EXYNOS_DPI
struct drm_encoder *exynos_dpi_probe(struct device *dev);
int exynos_dpi_remove(struct drm_encoder *encoder);
int exynos_dpi_bind(struct drm_device *dev, struct drm_encoder *encoder);
#else
static inline struct drm_encoder *
exynos_dpi_probe(struct device *dev) { return NULL; }
static inline int exynos_dpi_remove(struct drm_encoder *encoder)
{
return 0;
}
static inline int exynos_dpi_bind(struct drm_device *dev,
struct drm_encoder *encoder)
{
return 0;
}
#endif
int exynos_atomic_commit(struct drm_device *dev, struct drm_atomic_state *state,
bool nonblock);
int exynos_atomic_check(struct drm_device *dev, struct drm_atomic_state *state);
extern struct platform_driver fimd_driver;
extern struct platform_driver exynos5433_decon_driver;
extern struct platform_driver decon_driver;
extern struct platform_driver dp_driver;
extern struct platform_driver dsi_driver;
extern struct platform_driver mixer_driver;
extern struct platform_driver hdmi_driver;
extern struct platform_driver vidi_driver;
extern struct platform_driver g2d_driver;
extern struct platform_driver fimc_driver;
extern struct platform_driver rotator_driver;
extern struct platform_driver gsc_driver;
extern struct platform_driver mic_driver;
#endif
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