[PATCH v6 05/13] drm/sun4i: abstract a engine type

Icenowy Zheng
2017-05-04T11:48:50Z

As we are going to add support for the Allwinner DE2 engine in sun4i-drm
driver, we will finally have two types of display engines -- the DE1
backend and the DE2 mixer. They both do some display blending and feed
graphics data to TCON, so I choose to call them both "engine" here.

Abstract the engine type to a new struct with an ops struct, which contains
functions that should be called outside the engine-specified code (in
TCON, CRTC or TV Encoder code).

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
Changes in v6:
- Rebased on wens's multi-pipeline patchset.
- Split out Makefile changes.
Changes in v5:
- Really made a sunxi_engine struct type, and moved ops pointer
into it.
- Added checked ops wrappers.
- Changed the second parameter of layers_init from crtc to engine.
Changes in v4:
- Comments to tag the color correction functions as optional.
- Check before calling the optional functions.
- Change layers_init to satisfy new PATCH v4 04/11.

drivers/gpu/drm/sun4i/sun4i_backend.c | 68 ++++++++++++---------
drivers/gpu/drm/sun4i/sun4i_backend.h | 17 +++---
drivers/gpu/drm/sun4i/sun4i_crtc.c | 11 ++--
drivers/gpu/drm/sun4i/sun4i_crtc.h | 4 +-
drivers/gpu/drm/sun4i/sun4i_drv.c | 2 +-
drivers/gpu/drm/sun4i/sun4i_drv.h | 2 +-
drivers/gpu/drm/sun4i/sun4i_layer.c | 8 +--
drivers/gpu/drm/sun4i/sun4i_layer.h | 5 +-
drivers/gpu/drm/sun4i/sun4i_tcon.c | 36 ++++++-----
drivers/gpu/drm/sun4i/sun4i_tv.c | 9 ++-
drivers/gpu/drm/sun4i/sunxi_engine.h | 112 ++++++++++++++++++++++++++++++++++
11 files changed, 198 insertions(+), 76 deletions(-)
create mode 100644 drivers/gpu/drm/sun4i/sunxi_engine.h

diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c
index e53107418add..611cdcb9c182 100644
--- a/drivers/gpu/drm/sun4i/sun4i_backend.c
+++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
@@ -25,6 +25,8 @@

#include "sun4i_backend.h"
#include "sun4i_drv.h"
+#include "sun4i_layer.h"
+#include "sunxi_engine.h"

static const u32 sunxi_rgb2yuv_coef[12] = {
0x00000107, 0x00000204, 0x00000064, 0x00000108,
@@ -32,41 +34,38 @@ static const u32 sunxi_rgb2yuv_coef[12] = {
0x000001c1, 0x00003e88, 0x00003fb8, 0x00000808
};

-void sun4i_backend_apply_color_correction(struct sun4i_backend *backend)
+static void sun4i_backend_apply_color_correction(struct sunxi_engine *engine)
{
int i;

DRM_DEBUG_DRIVER("Applying RGB to YUV color correction\n");

/* Set color correction */
- regmap_write(backend->regs, SUN4I_BACKEND_OCCTL_REG,
+ regmap_write(engine->regs, SUN4I_BACKEND_OCCTL_REG,
SUN4I_BACKEND_OCCTL_ENABLE);

for (i = 0; i < 12; i++)
- regmap_write(backend->regs, SUN4I_BACKEND_OCRCOEF_REG(i),
+ regmap_write(engine->regs, SUN4I_BACKEND_OCRCOEF_REG(i),
sunxi_rgb2yuv_coef[i]);
}
-EXPORT_SYMBOL(sun4i_backend_apply_color_correction);

-void sun4i_backend_disable_color_correction(struct sun4i_backend *backend)
+static void sun4i_backend_disable_color_correction(struct sunxi_engine *engine)
{
DRM_DEBUG_DRIVER("Disabling color correction\n");

/* Disable color correction */
- regmap_update_bits(backend->regs, SUN4I_BACKEND_OCCTL_REG,
+ regmap_update_bits(engine->regs, SUN4I_BACKEND_OCCTL_REG,
SUN4I_BACKEND_OCCTL_ENABLE, 0);
}
-EXPORT_SYMBOL(sun4i_backend_disable_color_correction);

-void sun4i_backend_commit(struct sun4i_backend *backend)
+static void sun4i_backend_commit(struct sunxi_engine *engine)
{
DRM_DEBUG_DRIVER("Committing changes\n");

- regmap_write(backend->regs, SUN4I_BACKEND_REGBUFFCTL_REG,
+ regmap_write(engine->regs, SUN4I_BACKEND_REGBUFFCTL_REG,
SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS |
SUN4I_BACKEND_REGBUFFCTL_LOADCTL);
}
-EXPORT_SYMBOL(sun4i_backend_commit);

void sun4i_backend_layer_enable(struct sun4i_backend *backend,
int layer, bool enable)
@@ -81,7 +80,7 @@ void sun4i_backend_layer_enable(struct sun4i_backend *backend,
else
val = 0;

- regmap_update_bits(backend->regs, SUN4I_BACKEND_MODCTL_REG,
+ regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG,
SUN4I_BACKEND_MODCTL_LAY_EN(layer), val);
}
EXPORT_SYMBOL(sun4i_backend_layer_enable);
@@ -144,27 +143,28 @@ int sun4i_backend_update_layer_coord(struct sun4i_backend *backend,
if (plane->type == DRM_PLANE_TYPE_PRIMARY) {
DRM_DEBUG_DRIVER("Primary layer, updating global size W: %u H: %u\n",
state->crtc_w, state->crtc_h);
- regmap_write(backend->regs, SUN4I_BACKEND_DISSIZE_REG,
+ regmap_write(backend->engine.regs, SUN4I_BACKEND_DISSIZE_REG,
SUN4I_BACKEND_DISSIZE(state->crtc_w,
state->crtc_h));
}

/* Set the line width */
DRM_DEBUG_DRIVER("Layer line width: %d bits\n", fb->pitches[0] * 8);
- regmap_write(backend->regs, SUN4I_BACKEND_LAYLINEWIDTH_REG(layer),
+ regmap_write(backend->engine.regs,
+ SUN4I_BACKEND_LAYLINEWIDTH_REG(layer),
fb->pitches[0] * 8);

/* Set height and width */
DRM_DEBUG_DRIVER("Layer size W: %u H: %u\n",
state->crtc_w, state->crtc_h);
- regmap_write(backend->regs, SUN4I_BACKEND_LAYSIZE_REG(layer),
+ regmap_write(backend->engine.regs, SUN4I_BACKEND_LAYSIZE_REG(layer),
SUN4I_BACKEND_LAYSIZE(state->crtc_w,
state->crtc_h));

/* Set base coordinates */
DRM_DEBUG_DRIVER("Layer coordinates X: %d Y: %d\n",
state->crtc_x, state->crtc_y);
- regmap_write(backend->regs, SUN4I_BACKEND_LAYCOOR_REG(layer),
+ regmap_write(backend->engine.regs, SUN4I_BACKEND_LAYCOOR_REG(layer),
SUN4I_BACKEND_LAYCOOR(state->crtc_x,
state->crtc_y));

@@ -185,7 +185,7 @@ int sun4i_backend_update_layer_formats(struct sun4i_backend *backend,
interlaced = plane->state->crtc->state->adjusted_mode.flags
& DRM_MODE_FLAG_INTERLACE;

- regmap_update_bits(backend->regs, SUN4I_BACKEND_MODCTL_REG,
+ regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG,
SUN4I_BACKEND_MODCTL_ITLMOD_EN,
interlaced ? SUN4I_BACKEND_MODCTL_ITLMOD_EN : 0);

@@ -199,7 +199,8 @@ int sun4i_backend_update_layer_formats(struct sun4i_backend *backend,
return ret;
}

- regmap_update_bits(backend->regs, SUN4I_BACKEND_ATTCTL_REG1(layer),
+ regmap_update_bits(backend->engine.regs,
+ SUN4I_BACKEND_ATTCTL_REG1(layer),
SUN4I_BACKEND_ATTCTL_REG1_LAY_FBFMT, val);

return 0;
@@ -232,13 +233,14 @@ int sun4i_backend_update_layer_buffer(struct sun4i_backend *backend,
/* Write the 32 lower bits of the address (in bits) */
lo_paddr = paddr << 3;
DRM_DEBUG_DRIVER("Setting address lower bits to 0x%x\n", lo_paddr);
- regmap_write(backend->regs, SUN4I_BACKEND_LAYFB_L32ADD_REG(layer),
+ regmap_write(backend->engine.regs,
+ SUN4I_BACKEND_LAYFB_L32ADD_REG(layer),
lo_paddr);

/* And the upper bits */
hi_paddr = paddr >> 29;
DRM_DEBUG_DRIVER("Setting address high bits to 0x%x\n", hi_paddr);
- regmap_update_bits(backend->regs, SUN4I_BACKEND_LAYFB_H4ADD_REG,
+ regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_LAYFB_H4ADD_REG,
SUN4I_BACKEND_LAYFB_H4ADD_MSK(layer),
SUN4I_BACKEND_LAYFB_H4ADD(layer, hi_paddr));

@@ -330,6 +332,13 @@ static int sun4i_backend_of_get_id(struct device_node *node)
return ret;
}

+static const struct sunxi_engine_ops sun4i_backend_engine_ops = {
+ .commit = sun4i_backend_commit,
+ .layers_init = sun4i_layers_init,
+ .apply_color_correction = sun4i_backend_apply_color_correction,
+ .disable_color_correction = sun4i_backend_disable_color_correction,
+};
+
static struct regmap_config sun4i_backend_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
@@ -353,7 +362,8 @@ static int sun4i_backend_bind(struct device *dev, struct device *master,
return -ENOMEM;
dev_set_drvdata(dev, backend);

- backend->node = dev->of_node;
+ backend->engine.node = dev->of_node;
+ backend->engine.ops = &sun4i_backend_engine_ops;
backend->id = sun4i_backend_of_get_id(dev->of_node);
if (backend->id < 0)
return backend->id;
@@ -363,11 +373,11 @@ static int sun4i_backend_bind(struct device *dev, struct device *master,
if (IS_ERR(regs))
return PTR_ERR(regs);

- backend->regs = devm_regmap_init_mmio(dev, regs,
- &sun4i_backend_regmap_config);
- if (IS_ERR(backend->regs)) {
+ backend->engine.regs = devm_regmap_init_mmio(dev, regs,
+ &sun4i_backend_regmap_config);
+ if (IS_ERR(backend->engine.regs)) {
dev_err(dev, "Couldn't create the backend regmap\n");
- return PTR_ERR(backend->regs);
+ return PTR_ERR(backend->engine.regs);
}

backend->reset = devm_reset_control_get(dev, NULL);
@@ -415,18 +425,18 @@ static int sun4i_backend_bind(struct device *dev, struct device *master,
}
}

- list_add_tail(&backend->list, &drv->backend_list);
+ list_add_tail(&backend->engine.list, &drv->engine_list);

/* Reset the registers */
for (i = 0x800; i < 0x1000; i += 4)
- regmap_write(backend->regs, i, 0);
+ regmap_write(backend->engine.regs, i, 0);

/* Disable registers autoloading */
- regmap_write(backend->regs, SUN4I_BACKEND_REGBUFFCTL_REG,
+ regmap_write(backend->engine.regs, SUN4I_BACKEND_REGBUFFCTL_REG,
SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS);

/* Enable the backend */
- regmap_write(backend->regs, SUN4I_BACKEND_MODCTL_REG,
+ regmap_write(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG,
SUN4I_BACKEND_MODCTL_DEBE_EN |
SUN4I_BACKEND_MODCTL_START_CTL);

@@ -448,7 +458,7 @@ static void sun4i_backend_unbind(struct device *dev, struct device *master,
{
struct sun4i_backend *backend = dev_get_drvdata(dev);

- list_del(&backend->list);
+ list_del(&backend->engine.list);

if (of_device_is_compatible(dev->of_node,
"allwinner,sun8i-a33-display-backend"))
diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.h b/drivers/gpu/drm/sun4i/sun4i_backend.h
index 6327a2985fe6..b022a37e8e5b 100644
--- a/drivers/gpu/drm/sun4i/sun4i_backend.h
+++ b/drivers/gpu/drm/sun4i/sun4i_backend.h
@@ -19,6 +19,8 @@
#include <linux/regmap.h>
#include <linux/reset.h>

+#include "sunxi_engine.h"
+
#define SUN4I_BACKEND_MODCTL_REG 0x800
#define SUN4I_BACKEND_MODCTL_LINE_SEL BIT(29)
#define SUN4I_BACKEND_MODCTL_ITLMOD_EN BIT(28)
@@ -141,8 +143,7 @@
#define SUN4I_BACKEND_PIPE_OFF(p) (0x5000 + (0x400 * (p)))

struct sun4i_backend {
- struct device_node *node;
- struct regmap *regs;
+ struct sunxi_engine engine;

struct reset_control *reset;

@@ -154,15 +155,13 @@ struct sun4i_backend {
struct reset_control *sat_reset;

int id;
-
- /* Backend list management */
- struct list_head list;
};

-void sun4i_backend_apply_color_correction(struct sun4i_backend *backend);
-void sun4i_backend_disable_color_correction(struct sun4i_backend *backend);
-
-void sun4i_backend_commit(struct sun4i_backend *backend);
+static inline struct sun4i_backend *
+engine_to_sun4i_backend(struct sunxi_engine *engine)
+{
+ return container_of(engine, struct sun4i_backend, engine);
+}

void sun4i_backend_layer_enable(struct sun4i_backend *backend,
int layer, bool enable);
diff --git a/drivers/gpu/drm/sun4i/sun4i_crtc.c b/drivers/gpu/drm/sun4i/sun4i_crtc.c
index 708b3543d4e9..f8c70439d1e2 100644
--- a/drivers/gpu/drm/sun4i/sun4i_crtc.c
+++ b/drivers/gpu/drm/sun4i/sun4i_crtc.c
@@ -25,10 +25,9 @@

#include <video/videomode.h>

-#include "sun4i_backend.h"
#include "sun4i_crtc.h"
#include "sun4i_drv.h"
-#include "sun4i_layer.h"
+#include "sunxi_engine.h"
#include "sun4i_tcon.h"

static void sun4i_crtc_atomic_begin(struct drm_crtc *crtc,
@@ -56,7 +55,7 @@ static void sun4i_crtc_atomic_flush(struct drm_crtc *crtc,

DRM_DEBUG_DRIVER("Committing plane changes\n");

- sun4i_backend_commit(scrtc->backend);
+ sunxi_engine_commit(scrtc->engine);

if (event) {
crtc->state->event = NULL;
@@ -135,7 +134,7 @@ static const struct drm_crtc_funcs sun4i_crtc_funcs = {
};

struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm,
- struct sun4i_backend *backend,
+ struct sunxi_engine *engine,
struct sun4i_tcon *tcon)
{
struct sun4i_crtc *scrtc;
@@ -146,11 +145,11 @@ struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm,
scrtc = devm_kzalloc(drm->dev, sizeof(*scrtc), GFP_KERNEL);
if (!scrtc)
return ERR_PTR(-ENOMEM);
- scrtc->backend = backend;
+ scrtc->engine = engine;
scrtc->tcon = tcon;

/* Create our layers */
- planes = sun4i_layers_init(drm, scrtc);
+ planes = sunxi_engine_layers_init(drm, engine);
if (IS_ERR(planes)) {
dev_err(drm->dev, "Couldn't create the planes\n");
return NULL;
diff --git a/drivers/gpu/drm/sun4i/sun4i_crtc.h b/drivers/gpu/drm/sun4i/sun4i_crtc.h
index 4dae3508424a..bf0ce36eb518 100644
--- a/drivers/gpu/drm/sun4i/sun4i_crtc.h
+++ b/drivers/gpu/drm/sun4i/sun4i_crtc.h
@@ -17,7 +17,7 @@ struct sun4i_crtc {
struct drm_crtc crtc;
struct drm_pending_vblank_event *event;

- struct sun4i_backend *backend;
+ struct sunxi_engine *engine;
struct sun4i_tcon *tcon;
};

@@ -27,7 +27,7 @@ static inline struct sun4i_crtc *drm_crtc_to_sun4i_crtc(struct drm_crtc *crtc)
}

struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm,
- struct sun4i_backend *backend,
+ struct sunxi_engine *engine,
struct sun4i_tcon *tcon);

#endif /* _SUN4I_CRTC_H_ */
diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c
index 89c51fd6e9af..12ede8682b5c 100644
--- a/drivers/gpu/drm/sun4i/sun4i_drv.c
+++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
@@ -101,7 +101,7 @@ static int sun4i_drv_bind(struct device *dev)
goto free_drm;
}
drm->dev_private = drv;
- INIT_LIST_HEAD(&drv->backend_list);
+ INIT_LIST_HEAD(&drv->engine_list);
INIT_LIST_HEAD(&drv->tcon_list);

ret = of_reserved_mem_device_init(dev);
diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.h b/drivers/gpu/drm/sun4i/sun4i_drv.h
index 250c29017ef5..a960c89270cc 100644
--- a/drivers/gpu/drm/sun4i/sun4i_drv.h
+++ b/drivers/gpu/drm/sun4i/sun4i_drv.h
@@ -18,7 +18,7 @@
#include <linux/regmap.h>

struct sun4i_drv {
- struct list_head backend_list;
+ struct list_head engine_list;
struct list_head tcon_list;

struct drm_fbdev_cma *fbdev;
diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.c b/drivers/gpu/drm/sun4i/sun4i_layer.c
index e1f03e1cc0ac..ab33e4d06782 100644
--- a/drivers/gpu/drm/sun4i/sun4i_layer.c
+++ b/drivers/gpu/drm/sun4i/sun4i_layer.c
@@ -11,12 +11,10 @@
*/

#include <drm/drm_atomic_helper.h>
-#include <drm/drm_crtc.h>
#include <drm/drm_plane_helper.h>
#include <drm/drmP.h>

#include "sun4i_backend.h"
-#include "sun4i_crtc.h"
#include "sun4i_layer.h"

struct sun4i_plane_desc {
@@ -130,10 +128,10 @@ static struct sun4i_layer *sun4i_layer_init_one(struct drm_device *drm,
}

struct drm_plane **sun4i_layers_init(struct drm_device *drm,
- struct sun4i_crtc *crtc)
+ struct sunxi_engine *engine)
{
struct drm_plane **planes;
- struct sun4i_backend *backend = crtc->backend;
+ struct sun4i_backend *backend = engine_to_sun4i_backend(engine);
int i;

planes = devm_kcalloc(drm->dev, ARRAY_SIZE(sun4i_backend_planes) + 1,
@@ -175,7 +173,7 @@ struct drm_plane **sun4i_layers_init(struct drm_device *drm,

DRM_DEBUG_DRIVER("Assigning %s plane to pipe %d\n",
i ? "overlay" : "primary", plane->pipe);
- regmap_update_bits(backend->regs, SUN4I_BACKEND_ATTCTL_REG0(i),
+ regmap_update_bits(engine->regs, SUN4I_BACKEND_ATTCTL_REG0(i),
SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL_MASK,
SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL(plane->pipe));

diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.h b/drivers/gpu/drm/sun4i/sun4i_layer.h
index 5ea5c994d6ea..004b7cfe8ffb 100644
--- a/drivers/gpu/drm/sun4i/sun4i_layer.h
+++ b/drivers/gpu/drm/sun4i/sun4i_layer.h
@@ -13,6 +13,8 @@
#ifndef _SUN4I_LAYER_H_
#define _SUN4I_LAYER_H_

+struct sunxi_engine;
+
struct sun4i_layer {
struct drm_plane plane;
struct sun4i_drv *drv;
@@ -27,6 +29,5 @@ plane_to_sun4i_layer(struct drm_plane *plane)
}

struct drm_plane **sun4i_layers_init(struct drm_device *drm,
- struct sun4i_crtc *crtc);
-
+ struct sunxi_engine *engine);
#endif /* _SUN4I_LAYER_H_ */
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index 29fd829aa54c..c48135a10fda 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -26,12 +26,12 @@
#include <linux/regmap.h>
#include <linux/reset.h>

-#include "sun4i_backend.h"
#include "sun4i_crtc.h"
#include "sun4i_dotclock.h"
#include "sun4i_drv.h"
#include "sun4i_rgb.h"
#include "sun4i_tcon.h"
+#include "sunxi_engine.h"

void sun4i_tcon_disable(struct sun4i_tcon *tcon)
{
@@ -488,12 +488,16 @@ struct drm_bridge *sun4i_tcon_find_bridge(struct device_node *node)
* means maintaining a large list of them. Or, since the backend is
* registered and binded before the TCON, we can just go through the
* list of registered backends and compare the device node.
+ *
+ * As the structures now store engines instead of backends, here this
+ * function in fact searches the corresponding engine, and the ID is
+ * requested via the get_id function of the engine.
*/
-static struct sun4i_backend *sun4i_tcon_find_backend(struct sun4i_drv *drv,
+static struct sunxi_engine *sun4i_tcon_find_engine(struct sun4i_drv *drv,
struct device_node *node)
{
struct device_node *port, *ep, *remote;
- struct sun4i_backend *backend;
+ struct sunxi_engine *engine;

port = of_graph_get_port_by_id(node, 0);
if (!port)
@@ -504,21 +508,21 @@ static struct sun4i_backend *sun4i_tcon_find_backend(struct sun4i_drv *drv,
if (!remote)
continue;

- /* does this node match any registered backends? */
- list_for_each_entry(backend, &drv->backend_list, list) {
- if (remote == backend->node) {
+ /* does this node match any registered engines? */
+ list_for_each_entry(engine, &drv->engine_list, list) {
+ if (remote == engine->node) {
of_node_put(remote);
of_node_put(port);
- return backend;
+ return engine;
}
}

/* keep looking through upstream ports */
- backend = sun4i_tcon_find_backend(drv, remote);
- if (!IS_ERR(backend)) {
+ engine = sun4i_tcon_find_engine(drv, remote);
+ if (!IS_ERR(engine)) {
of_node_put(remote);
of_node_put(port);
- return backend;
+ return engine;
}
}

@@ -530,13 +534,13 @@ static int sun4i_tcon_bind(struct device *dev, struct device *master,
{
struct drm_device *drm = data;
struct sun4i_drv *drv = drm->dev_private;
- struct sun4i_backend *backend;
+ struct sunxi_engine *engine;
struct sun4i_tcon *tcon;
int ret;

- backend = sun4i_tcon_find_backend(drv, dev->of_node);
- if (IS_ERR(backend)) {
- dev_err(dev, "Couldn't find matching backend\n");
+ engine = sun4i_tcon_find_engine(drv, dev->of_node);
+ if (IS_ERR(engine)) {
+ dev_err(dev, "Couldn't find matching engine\n");
return -EPROBE_DEFER;
}

@@ -546,7 +550,7 @@ static int sun4i_tcon_bind(struct device *dev, struct device *master,
dev_set_drvdata(dev, tcon);
tcon->drm = drm;
tcon->dev = dev;
- tcon->id = backend->id;
+ tcon->id = sunxi_engine_get_id(engine);
tcon->quirks = of_device_get_match_data(dev);

tcon->lcd_rst = devm_reset_control_get(dev, "lcd");
@@ -589,7 +593,7 @@ static int sun4i_tcon_bind(struct device *dev, struct device *master,
goto err_free_dotclock;
}

- tcon->crtc = sun4i_crtc_init(drm, backend, tcon);
+ tcon->crtc = sun4i_crtc_init(drm, engine, tcon);
if (IS_ERR(tcon->crtc)) {
dev_err(dev, "Couldn't create our CRTC\n");
ret = PTR_ERR(tcon->crtc);
diff --git a/drivers/gpu/drm/sun4i/sun4i_tv.c b/drivers/gpu/drm/sun4i/sun4i_tv.c
index 542da220818b..a9cad00d4ee8 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tv.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tv.c
@@ -22,10 +22,10 @@
#include <drm/drm_of.h>
#include <drm/drm_panel.h>

-#include "sun4i_backend.h"
#include "sun4i_crtc.h"
#include "sun4i_drv.h"
#include "sun4i_tcon.h"
+#include "sunxi_engine.h"

#define SUN4I_TVE_EN_REG 0x000
#define SUN4I_TVE_EN_DAC_MAP_MASK GENMASK(19, 4)
@@ -353,7 +353,6 @@ static void sun4i_tv_disable(struct drm_encoder *encoder)
struct sun4i_tv *tv = drm_encoder_to_sun4i_tv(encoder);
struct sun4i_crtc *crtc = drm_crtc_to_sun4i_crtc(encoder->crtc);
struct sun4i_tcon *tcon = crtc->tcon;
- struct sun4i_backend *backend = crtc->backend;

DRM_DEBUG_DRIVER("Disabling the TV Output\n");

@@ -362,7 +361,8 @@ static void sun4i_tv_disable(struct drm_encoder *encoder)
regmap_update_bits(tv->regs, SUN4I_TVE_EN_REG,
SUN4I_TVE_EN_ENABLE,
0);
- sun4i_backend_disable_color_correction(backend);
+
+ sunxi_engine_disable_color_correction(crtc->engine);
}

static void sun4i_tv_enable(struct drm_encoder *encoder)
@@ -370,11 +370,10 @@ static void sun4i_tv_enable(struct drm_encoder *encoder)
struct sun4i_tv *tv = drm_encoder_to_sun4i_tv(encoder);
struct sun4i_crtc *crtc = drm_crtc_to_sun4i_crtc(encoder->crtc);
struct sun4i_tcon *tcon = crtc->tcon;
- struct sun4i_backend *backend = crtc->backend;

DRM_DEBUG_DRIVER("Enabling the TV Output\n");

- sun4i_backend_apply_color_correction(backend);
+ sunxi_engine_apply_color_correction(crtc->engine);

regmap_update_bits(tv->regs, SUN4I_TVE_EN_REG,
SUN4I_TVE_EN_ENABLE,
diff --git a/drivers/gpu/drm/sun4i/sunxi_engine.h b/drivers/gpu/drm/sun4i/sunxi_engine.h
new file mode 100644
index 000000000000..b3c6e6148568
--- /dev/null
+++ b/drivers/gpu/drm/sun4i/sunxi_engine.h
@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2017 Icenowy Zheng <icenowy@aosc.io>
+ *
+ * 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 _SUNXI_ENGINE_H_
+#define _SUNXI_ENGINE_H_
+
+struct sun4i_crtc;
+struct drm_plane;
+struct drm_device;
+
+struct sunxi_engine;
+
+struct sunxi_engine_ops {
+ void (*commit)(struct sunxi_engine *engine);
+ struct drm_plane **(*layers_init)(struct drm_device *drm,
+ struct sunxi_engine *engine);
+
+ void (*apply_color_correction)(struct sunxi_engine *engine);
+ void (*disable_color_correction)(struct sunxi_engine *engine);
+ int (*get_id)(struct sunxi_engine *engine);
+};
+
+/**
+ * struct sunxi_engine - the common parts of an engine for sun4i-drm driver
+ * @ops: the operations of the engine
+ * @regs: the regmap of the engine
+ */
+struct sunxi_engine {
+ const struct sunxi_engine_ops *ops;
+
+ struct device_node *node;
+ struct regmap *regs;
+
+ /* Engine list management */
+ struct list_head list;
+};
+
+/**
+ * sunxi_engine_commit() - commit all changes of the engine
+ * @engine: pointer to the engine
+ */
+static inline void
+sunxi_engine_commit(struct sunxi_engine *engine)
+{
+ if (engine->ops && engine->ops->commit)
+ engine->ops->commit(engine);
+}
+
+/**
+ * sunxi_engine_layers_init() - Create planes (layers) for the engine
+ * @drm: pointer to the drm_device for which planes will be created
+ * @engine: pointer to the engine
+ */
+static inline struct drm_plane **
+sunxi_engine_layers_init(struct drm_device *drm, struct sunxi_engine *engine)
+{
+ if (engine->ops && engine->ops->layers_init)
+ return engine->ops->layers_init(drm, engine);
+ return ERR_PTR(-ENOSYS);
+}
+
+/**
+ * sunxi_engine_apply_color_correction - Apply the RGB2YUV color correction
+ * @engine: pointer to the engine
+ *
+ * This functionality is optional for an engine, however, if the engine is
+ * intended to be used with TV Encoder, the output will be incorrect
+ * without the color correction, due to TV Encoder expects the engine to
+ * output directly YUV signal.
+ */
+static inline void
+sunxi_engine_apply_color_correction(struct sunxi_engine *engine)
+{
+ if (engine->ops && engine->ops->apply_color_correction)
+ engine->ops->apply_color_correction(engine);
+}
+
+/**
+ * sunxi_engine_disable_color_correction - Disable the color space correction
+ * @engine: pointer to the engine
+ *
+ * This function is paired with apply_color_correction().
+ */
+static inline void
+sunxi_engine_disable_color_correction(struct sunxi_engine *engine)
+{
+ if (engine->ops && engine->ops->disable_color_correction)
+ engine->ops->disable_color_correction(engine);
+}
+
+/**
+ * sunxi_engine_get_id - Get the ID of the engine.
+ * @engine: pointer to the engine
+ *
+ * If the ID is not necessary, just do not implement it in sunxi_engine_ops,
+ * and a default -1 will be returned.
+ */
+static inline int
+sunxi_engine_get_id(struct sunxi_engine *engine)
+{
+ if (engine->ops && engine->ops->get_id)
+ return engine->ops->get_id(engine);
+
+ return -1;
+}
+#endif /* _SUNXI_ENGINE_H_ */
--
2.12.2