1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * vsp1_sru.c  --  R-Car VSP1 Super Resolution Unit
4 *
5 * Copyright (C) 2013 Renesas Corporation
6 *
7 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
8 */
9
10#include <linux/device.h>
11#include <linux/gfp.h>
12
13#include <media/v4l2-subdev.h>
14
15#include "vsp1.h"
16#include "vsp1_dl.h"
17#include "vsp1_pipe.h"
18#include "vsp1_sru.h"
19
20#define SRU_MIN_SIZE				4U
21#define SRU_MAX_SIZE				8190U
22
23/* -----------------------------------------------------------------------------
24 * Device Access
25 */
26
27static inline void vsp1_sru_write(struct vsp1_sru *sru,
28				  struct vsp1_dl_body *dlb, u32 reg, u32 data)
29{
30	vsp1_dl_body_write(dlb, reg, data);
31}
32
33/* -----------------------------------------------------------------------------
34 * Controls
35 */
36
37#define V4L2_CID_VSP1_SRU_INTENSITY		(V4L2_CID_USER_BASE | 0x1001)
38
39struct vsp1_sru_param {
40	u32 ctrl0;
41	u32 ctrl2;
42};
43
44#define VI6_SRU_CTRL0_PARAMS(p0, p1)			\
45	(((p0) << VI6_SRU_CTRL0_PARAM0_SHIFT) |		\
46	 ((p1) << VI6_SRU_CTRL0_PARAM1_SHIFT))
47
48#define VI6_SRU_CTRL2_PARAMS(p6, p7, p8)		\
49	(((p6) << VI6_SRU_CTRL2_PARAM6_SHIFT) |		\
50	 ((p7) << VI6_SRU_CTRL2_PARAM7_SHIFT) |		\
51	 ((p8) << VI6_SRU_CTRL2_PARAM8_SHIFT))
52
53static const struct vsp1_sru_param vsp1_sru_params[] = {
54	{
55		.ctrl0 = VI6_SRU_CTRL0_PARAMS(256, 4) | VI6_SRU_CTRL0_EN,
56		.ctrl2 = VI6_SRU_CTRL2_PARAMS(24, 40, 255),
57	}, {
58		.ctrl0 = VI6_SRU_CTRL0_PARAMS(256, 4) | VI6_SRU_CTRL0_EN,
59		.ctrl2 = VI6_SRU_CTRL2_PARAMS(8, 16, 255),
60	}, {
61		.ctrl0 = VI6_SRU_CTRL0_PARAMS(384, 5) | VI6_SRU_CTRL0_EN,
62		.ctrl2 = VI6_SRU_CTRL2_PARAMS(36, 60, 255),
63	}, {
64		.ctrl0 = VI6_SRU_CTRL0_PARAMS(384, 5) | VI6_SRU_CTRL0_EN,
65		.ctrl2 = VI6_SRU_CTRL2_PARAMS(12, 27, 255),
66	}, {
67		.ctrl0 = VI6_SRU_CTRL0_PARAMS(511, 6) | VI6_SRU_CTRL0_EN,
68		.ctrl2 = VI6_SRU_CTRL2_PARAMS(48, 80, 255),
69	}, {
70		.ctrl0 = VI6_SRU_CTRL0_PARAMS(511, 6) | VI6_SRU_CTRL0_EN,
71		.ctrl2 = VI6_SRU_CTRL2_PARAMS(16, 36, 255),
72	},
73};
74
75static int sru_s_ctrl(struct v4l2_ctrl *ctrl)
76{
77	struct vsp1_sru *sru =
78		container_of(ctrl->handler, struct vsp1_sru, ctrls);
79
80	switch (ctrl->id) {
81	case V4L2_CID_VSP1_SRU_INTENSITY:
82		sru->intensity = ctrl->val;
83		break;
84	}
85
86	return 0;
87}
88
89static const struct v4l2_ctrl_ops sru_ctrl_ops = {
90	.s_ctrl = sru_s_ctrl,
91};
92
93static const struct v4l2_ctrl_config sru_intensity_control = {
94	.ops = &sru_ctrl_ops,
95	.id = V4L2_CID_VSP1_SRU_INTENSITY,
96	.name = "Intensity",
97	.type = V4L2_CTRL_TYPE_INTEGER,
98	.min = 1,
99	.max = 6,
100	.def = 1,
101	.step = 1,
102};
103
104/* -----------------------------------------------------------------------------
105 * V4L2 Subdevice Operations
106 */
107
108static int sru_enum_mbus_code(struct v4l2_subdev *subdev,
109			      struct v4l2_subdev_pad_config *cfg,
110			      struct v4l2_subdev_mbus_code_enum *code)
111{
112	static const unsigned int codes[] = {
113		MEDIA_BUS_FMT_ARGB8888_1X32,
114		MEDIA_BUS_FMT_AYUV8_1X32,
115	};
116
117	return vsp1_subdev_enum_mbus_code(subdev, cfg, code, codes,
118					  ARRAY_SIZE(codes));
119}
120
121static int sru_enum_frame_size(struct v4l2_subdev *subdev,
122			       struct v4l2_subdev_pad_config *cfg,
123			       struct v4l2_subdev_frame_size_enum *fse)
124{
125	struct vsp1_sru *sru = to_sru(subdev);
126	struct v4l2_subdev_pad_config *config;
127	struct v4l2_mbus_framefmt *format;
128	int ret = 0;
129
130	config = vsp1_entity_get_pad_config(&sru->entity, cfg, fse->which);
131	if (!config)
132		return -EINVAL;
133
134	format = vsp1_entity_get_pad_format(&sru->entity, config, SRU_PAD_SINK);
135
136	mutex_lock(&sru->entity.lock);
137
138	if (fse->index || fse->code != format->code) {
139		ret = -EINVAL;
140		goto done;
141	}
142
143	if (fse->pad == SRU_PAD_SINK) {
144		fse->min_width = SRU_MIN_SIZE;
145		fse->max_width = SRU_MAX_SIZE;
146		fse->min_height = SRU_MIN_SIZE;
147		fse->max_height = SRU_MAX_SIZE;
148	} else {
149		fse->min_width = format->width;
150		fse->min_height = format->height;
151		if (format->width <= SRU_MAX_SIZE / 2 &&
152		    format->height <= SRU_MAX_SIZE / 2) {
153			fse->max_width = format->width * 2;
154			fse->max_height = format->height * 2;
155		} else {
156			fse->max_width = format->width;
157			fse->max_height = format->height;
158		}
159	}
160
161done:
162	mutex_unlock(&sru->entity.lock);
163	return ret;
164}
165
166static void sru_try_format(struct vsp1_sru *sru,
167			   struct v4l2_subdev_pad_config *config,
168			   unsigned int pad, struct v4l2_mbus_framefmt *fmt)
169{
170	struct v4l2_mbus_framefmt *format;
171	unsigned int input_area;
172	unsigned int output_area;
173
174	switch (pad) {
175	case SRU_PAD_SINK:
176		/* Default to YUV if the requested format is not supported. */
177		if (fmt->code != MEDIA_BUS_FMT_ARGB8888_1X32 &&
178		    fmt->code != MEDIA_BUS_FMT_AYUV8_1X32)
179			fmt->code = MEDIA_BUS_FMT_AYUV8_1X32;
180
181		fmt->width = clamp(fmt->width, SRU_MIN_SIZE, SRU_MAX_SIZE);
182		fmt->height = clamp(fmt->height, SRU_MIN_SIZE, SRU_MAX_SIZE);
183		break;
184
185	case SRU_PAD_SOURCE:
186		/* The SRU can't perform format conversion. */
187		format = vsp1_entity_get_pad_format(&sru->entity, config,
188						    SRU_PAD_SINK);
189		fmt->code = format->code;
190
191		/*
192		 * We can upscale by 2 in both direction, but not independently.
193		 * Compare the input and output rectangles areas (avoiding
194		 * integer overflows on the output): if the requested output
195		 * area is larger than 1.5^2 the input area upscale by two,
196		 * otherwise don't scale.
197		 */
198		input_area = format->width * format->height;
199		output_area = min(fmt->width, SRU_MAX_SIZE)
200			    * min(fmt->height, SRU_MAX_SIZE);
201
202		if (fmt->width <= SRU_MAX_SIZE / 2 &&
203		    fmt->height <= SRU_MAX_SIZE / 2 &&
204		    output_area > input_area * 9 / 4) {
205			fmt->width = format->width * 2;
206			fmt->height = format->height * 2;
207		} else {
208			fmt->width = format->width;
209			fmt->height = format->height;
210		}
211		break;
212	}
213
214	fmt->field = V4L2_FIELD_NONE;
215	fmt->colorspace = V4L2_COLORSPACE_SRGB;
216}
217
218static int sru_set_format(struct v4l2_subdev *subdev,
219			  struct v4l2_subdev_pad_config *cfg,
220			  struct v4l2_subdev_format *fmt)
221{
222	struct vsp1_sru *sru = to_sru(subdev);
223	struct v4l2_subdev_pad_config *config;
224	struct v4l2_mbus_framefmt *format;
225	int ret = 0;
226
227	mutex_lock(&sru->entity.lock);
228
229	config = vsp1_entity_get_pad_config(&sru->entity, cfg, fmt->which);
230	if (!config) {
231		ret = -EINVAL;
232		goto done;
233	}
234
235	sru_try_format(sru, config, fmt->pad, &fmt->format);
236
237	format = vsp1_entity_get_pad_format(&sru->entity, config, fmt->pad);
238	*format = fmt->format;
239
240	if (fmt->pad == SRU_PAD_SINK) {
241		/* Propagate the format to the source pad. */
242		format = vsp1_entity_get_pad_format(&sru->entity, config,
243						    SRU_PAD_SOURCE);
244		*format = fmt->format;
245
246		sru_try_format(sru, config, SRU_PAD_SOURCE, format);
247	}
248
249done:
250	mutex_unlock(&sru->entity.lock);
251	return ret;
252}
253
254static const struct v4l2_subdev_pad_ops sru_pad_ops = {
255	.init_cfg = vsp1_entity_init_cfg,
256	.enum_mbus_code = sru_enum_mbus_code,
257	.enum_frame_size = sru_enum_frame_size,
258	.get_fmt = vsp1_subdev_get_pad_format,
259	.set_fmt = sru_set_format,
260};
261
262static const struct v4l2_subdev_ops sru_ops = {
263	.pad    = &sru_pad_ops,
264};
265
266/* -----------------------------------------------------------------------------
267 * VSP1 Entity Operations
268 */
269
270static void sru_configure_stream(struct vsp1_entity *entity,
271				 struct vsp1_pipeline *pipe,
272				 struct vsp1_dl_list *dl,
273				 struct vsp1_dl_body *dlb)
274{
275	const struct vsp1_sru_param *param;
276	struct vsp1_sru *sru = to_sru(&entity->subdev);
277	struct v4l2_mbus_framefmt *input;
278	struct v4l2_mbus_framefmt *output;
279	u32 ctrl0;
280
281	input = vsp1_entity_get_pad_format(&sru->entity, sru->entity.config,
282					   SRU_PAD_SINK);
283	output = vsp1_entity_get_pad_format(&sru->entity, sru->entity.config,
284					    SRU_PAD_SOURCE);
285
286	if (input->code == MEDIA_BUS_FMT_ARGB8888_1X32)
287		ctrl0 = VI6_SRU_CTRL0_PARAM2 | VI6_SRU_CTRL0_PARAM3
288		      | VI6_SRU_CTRL0_PARAM4;
289	else
290		ctrl0 = VI6_SRU_CTRL0_PARAM3;
291
292	if (input->width != output->width)
293		ctrl0 |= VI6_SRU_CTRL0_MODE_UPSCALE;
294
295	param = &vsp1_sru_params[sru->intensity - 1];
296
297	ctrl0 |= param->ctrl0;
298
299	vsp1_sru_write(sru, dlb, VI6_SRU_CTRL0, ctrl0);
300	vsp1_sru_write(sru, dlb, VI6_SRU_CTRL1, VI6_SRU_CTRL1_PARAM5);
301	vsp1_sru_write(sru, dlb, VI6_SRU_CTRL2, param->ctrl2);
302}
303
304static unsigned int sru_max_width(struct vsp1_entity *entity,
305				  struct vsp1_pipeline *pipe)
306{
307	struct vsp1_sru *sru = to_sru(&entity->subdev);
308	struct v4l2_mbus_framefmt *input;
309	struct v4l2_mbus_framefmt *output;
310
311	input = vsp1_entity_get_pad_format(&sru->entity, sru->entity.config,
312					   SRU_PAD_SINK);
313	output = vsp1_entity_get_pad_format(&sru->entity, sru->entity.config,
314					    SRU_PAD_SOURCE);
315
316	/*
317	 * The maximum input width of the SRU is 288 input pixels, but 32
318	 * pixels are reserved to support overlapping partition windows when
319	 * scaling.
320	 */
321	if (input->width != output->width)
322		return 512;
323	else
324		return 256;
325}
326
327static void sru_partition(struct vsp1_entity *entity,
328			  struct vsp1_pipeline *pipe,
329			  struct vsp1_partition *partition,
330			  unsigned int partition_idx,
331			  struct vsp1_partition_window *window)
332{
333	struct vsp1_sru *sru = to_sru(&entity->subdev);
334	struct v4l2_mbus_framefmt *input;
335	struct v4l2_mbus_framefmt *output;
336
337	input = vsp1_entity_get_pad_format(&sru->entity, sru->entity.config,
338					   SRU_PAD_SINK);
339	output = vsp1_entity_get_pad_format(&sru->entity, sru->entity.config,
340					    SRU_PAD_SOURCE);
341
342	/* Adapt if SRUx2 is enabled. */
343	if (input->width != output->width) {
344		window->width /= 2;
345		window->left /= 2;
346	}
347
348	partition->sru = *window;
349}
350
351static const struct vsp1_entity_operations sru_entity_ops = {
352	.configure_stream = sru_configure_stream,
353	.max_width = sru_max_width,
354	.partition = sru_partition,
355};
356
357/* -----------------------------------------------------------------------------
358 * Initialization and Cleanup
359 */
360
361struct vsp1_sru *vsp1_sru_create(struct vsp1_device *vsp1)
362{
363	struct vsp1_sru *sru;
364	int ret;
365
366	sru = devm_kzalloc(vsp1->dev, sizeof(*sru), GFP_KERNEL);
367	if (sru == NULL)
368		return ERR_PTR(-ENOMEM);
369
370	sru->entity.ops = &sru_entity_ops;
371	sru->entity.type = VSP1_ENTITY_SRU;
372
373	ret = vsp1_entity_init(vsp1, &sru->entity, "sru", 2, &sru_ops,
374			       MEDIA_ENT_F_PROC_VIDEO_SCALER);
375	if (ret < 0)
376		return ERR_PTR(ret);
377
378	/* Initialize the control handler. */
379	v4l2_ctrl_handler_init(&sru->ctrls, 1);
380	v4l2_ctrl_new_custom(&sru->ctrls, &sru_intensity_control, NULL);
381
382	sru->intensity = 1;
383
384	sru->entity.subdev.ctrl_handler = &sru->ctrls;
385
386	if (sru->ctrls.error) {
387		dev_err(vsp1->dev, "sru: failed to initialize controls\n");
388		ret = sru->ctrls.error;
389		vsp1_entity_destroy(&sru->entity);
390		return ERR_PTR(ret);
391	}
392
393	return sru;
394}
395