vsp1_lif.c

  1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * vsp1_lif.c  --  R-Car VSP1 LCD Controller Interface
  4 *
  5 * Copyright (C) 2013-2014 Renesas Electronics 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_lif.h"
 18
 19#define LIF_MIN_SIZE				2U
 20#define LIF_MAX_SIZE				8190U
 21
 22/* -----------------------------------------------------------------------------
 23 * Device Access
 24 */
 25
 26static inline void vsp1_lif_write(struct vsp1_lif *lif,
 27				  struct vsp1_dl_body *dlb, u32 reg, u32 data)
 28{
 29	vsp1_dl_body_write(dlb, reg + lif->entity.index * VI6_LIF_OFFSET,
 30			       data);
 31}
 32
 33/* -----------------------------------------------------------------------------
 34 * V4L2 Subdevice Operations
 35 */
 36
 37static const unsigned int lif_codes[] = {
 38	MEDIA_BUS_FMT_ARGB8888_1X32,
 39	MEDIA_BUS_FMT_AYUV8_1X32,
 40};
 41
 42static int lif_enum_mbus_code(struct v4l2_subdev *subdev,
 43			      struct v4l2_subdev_state *sd_state,
 44			      struct v4l2_subdev_mbus_code_enum *code)
 45{
 46	return vsp1_subdev_enum_mbus_code(subdev, sd_state, code, lif_codes,
 47					  ARRAY_SIZE(lif_codes));
 48}
 49
 50static int lif_enum_frame_size(struct v4l2_subdev *subdev,
 51			       struct v4l2_subdev_state *sd_state,
 52			       struct v4l2_subdev_frame_size_enum *fse)
 53{
 54	return vsp1_subdev_enum_frame_size(subdev, sd_state, fse,
 55					   LIF_MIN_SIZE,
 56					   LIF_MIN_SIZE, LIF_MAX_SIZE,
 57					   LIF_MAX_SIZE);
 58}
 59
 60static int lif_set_format(struct v4l2_subdev *subdev,
 61			  struct v4l2_subdev_state *sd_state,
 62			  struct v4l2_subdev_format *fmt)
 63{
 64	return vsp1_subdev_set_pad_format(subdev, sd_state, fmt, lif_codes,
 65					  ARRAY_SIZE(lif_codes),
 66					  LIF_MIN_SIZE, LIF_MIN_SIZE,
 67					  LIF_MAX_SIZE, LIF_MAX_SIZE);
 68}
 69
 70static const struct v4l2_subdev_pad_ops lif_pad_ops = {
 71	.enum_mbus_code = lif_enum_mbus_code,
 72	.enum_frame_size = lif_enum_frame_size,
 73	.get_fmt = vsp1_subdev_get_pad_format,
 74	.set_fmt = lif_set_format,
 75};
 76
 77static const struct v4l2_subdev_ops lif_ops = {
 78	.pad    = &lif_pad_ops,
 79};
 80
 81/* -----------------------------------------------------------------------------
 82 * VSP1 Entity Operations
 83 */
 84
 85static void lif_configure_stream(struct vsp1_entity *entity,
 86				 struct v4l2_subdev_state *state,
 87				 struct vsp1_pipeline *pipe,
 88				 struct vsp1_dl_list *dl,
 89				 struct vsp1_dl_body *dlb)
 90{
 91	const struct v4l2_mbus_framefmt *format;
 92	struct vsp1_lif *lif = to_lif(&entity->subdev);
 93	unsigned int hbth;
 94	unsigned int obth;
 95	unsigned int lbth;
 96
 97	format = v4l2_subdev_state_get_format(state, LIF_PAD_SOURCE);
 98
 99	switch (entity->vsp1->version & VI6_IP_VERSION_MODEL_MASK) {
100	case VI6_IP_VERSION_MODEL_VSPD_GEN2:
101	case VI6_IP_VERSION_MODEL_VSPD_V2H:
102		hbth = 1536;
103		obth = min(128U, (format->width + 1) / 2 * format->height - 4);
104		lbth = 1520;
105		break;
106
107	case VI6_IP_VERSION_MODEL_VSPDL_GEN3:
108	case VI6_IP_VERSION_MODEL_VSPD_V3:
109	case VI6_IP_VERSION_MODEL_VSPD_RZG2L:
110		hbth = 0;
111		obth = 1500;
112		lbth = 0;
113		break;
114
115	case VI6_IP_VERSION_MODEL_VSPD_GEN3:
116	case VI6_IP_VERSION_MODEL_VSPD_GEN4:
117	default:
118		hbth = 0;
119		obth = 3000;
120		lbth = 0;
121		break;
122	}
123
124	vsp1_lif_write(lif, dlb, VI6_LIF_CSBTH,
125			(hbth << VI6_LIF_CSBTH_HBTH_SHIFT) |
126			(lbth << VI6_LIF_CSBTH_LBTH_SHIFT));
127
128	vsp1_lif_write(lif, dlb, VI6_LIF_CTRL,
129			(obth << VI6_LIF_CTRL_OBTH_SHIFT) |
130			(format->code == 0 ? VI6_LIF_CTRL_CFMT : 0) |
131			VI6_LIF_CTRL_REQSEL | VI6_LIF_CTRL_LIF_EN);
132
133	/*
134	 * On R-Car V3M and RZ/G2L the LIF0 buffer attribute register has to be
135	 * set to a non-default value to guarantee proper operation (otherwise
136	 * artifacts may appear on the output). The value required by the
137	 * manual is not explained but is likely a buffer size or threshold.
138	 */
139	if (vsp1_feature(entity->vsp1, VSP1_HAS_NON_ZERO_LBA))
140		vsp1_lif_write(lif, dlb, VI6_LIF_LBA,
141			       VI6_LIF_LBA_LBA0 |
142			       (1536 << VI6_LIF_LBA_LBA1_SHIFT));
143}
144
145static const struct vsp1_entity_operations lif_entity_ops = {
146	.configure_stream = lif_configure_stream,
147};
148
149/* -----------------------------------------------------------------------------
150 * Initialization and Cleanup
151 */
152
153struct vsp1_lif *vsp1_lif_create(struct vsp1_device *vsp1, unsigned int index)
154{
155	struct vsp1_lif *lif;
156	int ret;
157
158	lif = devm_kzalloc(vsp1->dev, sizeof(*lif), GFP_KERNEL);
159	if (lif == NULL)
160		return ERR_PTR(-ENOMEM);
161
162	lif->entity.ops = &lif_entity_ops;
163	lif->entity.type = VSP1_ENTITY_LIF;
164	lif->entity.index = index;
165
166	/*
167	 * The LIF is never exposed to userspace, but media entity registration
168	 * requires a function to be set. Use PROC_VIDEO_PIXEL_FORMATTER just to
169	 * avoid triggering a WARN_ON(), the value won't be seen anywhere.
170	 */
171	ret = vsp1_entity_init(vsp1, &lif->entity, "lif", 2, &lif_ops,
172			       MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER);
173	if (ret < 0)
174		return ERR_PTR(ret);
175
176	return lif;
177}