vsp1_lut.c

  1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * vsp1_lut.c  --  R-Car VSP1 Look-Up Table
  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_lut.h"
 18
 19#define LUT_MIN_SIZE				4U
 20#define LUT_MAX_SIZE				8190U
 21
 22#define LUT_SIZE				256
 23
 24/* -----------------------------------------------------------------------------
 25 * Device Access
 26 */
 27
 28static inline void vsp1_lut_write(struct vsp1_lut *lut,
 29				  struct vsp1_dl_body *dlb, u32 reg, u32 data)
 30{
 31	vsp1_dl_body_write(dlb, reg, data);
 32}
 33
 34/* -----------------------------------------------------------------------------
 35 * Controls
 36 */
 37
 38#define V4L2_CID_VSP1_LUT_TABLE			(V4L2_CID_USER_BASE | 0x1001)
 39
 40static int lut_set_table(struct vsp1_lut *lut, struct v4l2_ctrl *ctrl)
 41{
 42	struct vsp1_dl_body *dlb;
 43	unsigned int i;
 44
 45	dlb = vsp1_dl_body_get(lut->pool);
 46	if (!dlb)
 47		return -ENOMEM;
 48
 49	for (i = 0; i < LUT_SIZE; ++i)
 50		vsp1_dl_body_write(dlb, VI6_LUT_TABLE + 4 * i,
 51				       ctrl->p_new.p_u32[i]);
 52
 53	spin_lock_irq(&lut->lock);
 54	swap(lut->lut, dlb);
 55	spin_unlock_irq(&lut->lock);
 56
 57	vsp1_dl_body_put(dlb);
 58	return 0;
 59}
 60
 61static int lut_s_ctrl(struct v4l2_ctrl *ctrl)
 62{
 63	struct vsp1_lut *lut =
 64		container_of(ctrl->handler, struct vsp1_lut, ctrls);
 65
 66	switch (ctrl->id) {
 67	case V4L2_CID_VSP1_LUT_TABLE:
 68		lut_set_table(lut, ctrl);
 69		break;
 70	}
 71
 72	return 0;
 73}
 74
 75static const struct v4l2_ctrl_ops lut_ctrl_ops = {
 76	.s_ctrl = lut_s_ctrl,
 77};
 78
 79static const struct v4l2_ctrl_config lut_table_control = {
 80	.ops = &lut_ctrl_ops,
 81	.id = V4L2_CID_VSP1_LUT_TABLE,
 82	.name = "Look-Up Table",
 83	.type = V4L2_CTRL_TYPE_U32,
 84	.min = 0x00000000,
 85	.max = 0x00ffffff,
 86	.step = 1,
 87	.def = 0,
 88	.dims = { LUT_SIZE },
 89};
 90
 91/* -----------------------------------------------------------------------------
 92 * V4L2 Subdevice Pad Operations
 93 */
 94
 95static const unsigned int lut_codes[] = {
 96	MEDIA_BUS_FMT_ARGB8888_1X32,
 97	MEDIA_BUS_FMT_AHSV8888_1X32,
 98	MEDIA_BUS_FMT_AYUV8_1X32,
 99};
100
101static int lut_enum_mbus_code(struct v4l2_subdev *subdev,
102			      struct v4l2_subdev_state *sd_state,
103			      struct v4l2_subdev_mbus_code_enum *code)
104{
105	return vsp1_subdev_enum_mbus_code(subdev, sd_state, code, lut_codes,
106					  ARRAY_SIZE(lut_codes));
107}
108
109static int lut_enum_frame_size(struct v4l2_subdev *subdev,
110			       struct v4l2_subdev_state *sd_state,
111			       struct v4l2_subdev_frame_size_enum *fse)
112{
113	return vsp1_subdev_enum_frame_size(subdev, sd_state, fse,
114					   LUT_MIN_SIZE,
115					   LUT_MIN_SIZE, LUT_MAX_SIZE,
116					   LUT_MAX_SIZE);
117}
118
119static int lut_set_format(struct v4l2_subdev *subdev,
120			  struct v4l2_subdev_state *sd_state,
121			  struct v4l2_subdev_format *fmt)
122{
123	return vsp1_subdev_set_pad_format(subdev, sd_state, fmt, lut_codes,
124					  ARRAY_SIZE(lut_codes),
125					  LUT_MIN_SIZE, LUT_MIN_SIZE,
126					  LUT_MAX_SIZE, LUT_MAX_SIZE);
127}
128
129/* -----------------------------------------------------------------------------
130 * V4L2 Subdevice Operations
131 */
132
133static const struct v4l2_subdev_pad_ops lut_pad_ops = {
134	.enum_mbus_code = lut_enum_mbus_code,
135	.enum_frame_size = lut_enum_frame_size,
136	.get_fmt = vsp1_subdev_get_pad_format,
137	.set_fmt = lut_set_format,
138};
139
140static const struct v4l2_subdev_ops lut_ops = {
141	.pad    = &lut_pad_ops,
142};
143
144/* -----------------------------------------------------------------------------
145 * VSP1 Entity Operations
146 */
147
148static void lut_configure_stream(struct vsp1_entity *entity,
149				 struct v4l2_subdev_state *state,
150				 struct vsp1_pipeline *pipe,
151				 struct vsp1_dl_list *dl,
152				 struct vsp1_dl_body *dlb)
153{
154	struct vsp1_lut *lut = to_lut(&entity->subdev);
155
156	vsp1_lut_write(lut, dlb, VI6_LUT_CTRL, VI6_LUT_CTRL_EN);
157}
158
159static void lut_configure_frame(struct vsp1_entity *entity,
160				struct vsp1_pipeline *pipe,
161				struct vsp1_dl_list *dl,
162				struct vsp1_dl_body *dlb)
163{
164	struct vsp1_lut *lut = to_lut(&entity->subdev);
165	struct vsp1_dl_body *lut_dlb;
166	unsigned long flags;
167
168	spin_lock_irqsave(&lut->lock, flags);
169	lut_dlb = lut->lut;
170	lut->lut = NULL;
171	spin_unlock_irqrestore(&lut->lock, flags);
172
173	if (lut_dlb) {
174		vsp1_dl_list_add_body(dl, lut_dlb);
175
176		/* Release our local reference. */
177		vsp1_dl_body_put(lut_dlb);
178	}
179}
180
181static void lut_destroy(struct vsp1_entity *entity)
182{
183	struct vsp1_lut *lut = to_lut(&entity->subdev);
184
185	vsp1_dl_body_pool_destroy(lut->pool);
186}
187
188static const struct vsp1_entity_operations lut_entity_ops = {
189	.configure_stream = lut_configure_stream,
190	.configure_frame = lut_configure_frame,
191	.destroy = lut_destroy,
192};
193
194/* -----------------------------------------------------------------------------
195 * Initialization and Cleanup
196 */
197
198struct vsp1_lut *vsp1_lut_create(struct vsp1_device *vsp1)
199{
200	struct vsp1_lut *lut;
201	int ret;
202
203	lut = devm_kzalloc(vsp1->dev, sizeof(*lut), GFP_KERNEL);
204	if (lut == NULL)
205		return ERR_PTR(-ENOMEM);
206
207	spin_lock_init(&lut->lock);
208
209	lut->entity.ops = &lut_entity_ops;
210	lut->entity.type = VSP1_ENTITY_LUT;
211
212	ret = vsp1_entity_init(vsp1, &lut->entity, "lut", 2, &lut_ops,
213			       MEDIA_ENT_F_PROC_VIDEO_LUT);
214	if (ret < 0)
215		return ERR_PTR(ret);
216
217	/*
218	 * Pre-allocate a body pool, with 3 bodies allowing a userspace update
219	 * before the hardware has committed a previous set of tables, handling
220	 * both the queued and pending dl entries.
221	 */
222	lut->pool = vsp1_dl_body_pool_create(vsp1, 3, LUT_SIZE, 0);
223	if (!lut->pool)
224		return ERR_PTR(-ENOMEM);
225
226	/* Initialize the control handler. */
227	v4l2_ctrl_handler_init(&lut->ctrls, 1);
228	v4l2_ctrl_new_custom(&lut->ctrls, &lut_table_control, NULL);
229
230	lut->entity.subdev.ctrl_handler = &lut->ctrls;
231
232	if (lut->ctrls.error) {
233		dev_err(vsp1->dev, "lut: failed to initialize controls\n");
234		ret = lut->ctrls.error;
235		vsp1_entity_destroy(&lut->entity);
236		return ERR_PTR(ret);
237	}
238
239	v4l2_ctrl_handler_setup(&lut->ctrls);
240
241	return lut;
242}