1/*
  2 * R-Car Display Unit HDMI Encoder
  3 *
  4 * Copyright (C) 2014 Renesas Electronics Corporation
  5 *
  6 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
  7 *
  8 * This program is free software; you can redistribute it and/or modify
  9 * it under the terms of the GNU General Public License as published by
 10 * the Free Software Foundation; either version 2 of the License, or
 11 * (at your option) any later version.
 12 */
 13
 14#include <linux/slab.h>
 15
 16#include <drm/drmP.h>
 17#include <drm/drm_crtc.h>
 18#include <drm/drm_crtc_helper.h>
 19#include <drm/drm_encoder_slave.h>
 20
 21#include "rcar_du_drv.h"
 22#include "rcar_du_encoder.h"
 23#include "rcar_du_hdmienc.h"
 24#include "rcar_du_lvdsenc.h"
 25
 26struct rcar_du_hdmienc {
 27	struct rcar_du_encoder *renc;
 28	struct device *dev;
 29	bool enabled;
 30};
 31
 32#define to_rcar_hdmienc(e)	(to_rcar_encoder(e)->hdmi)
 33#define to_slave_funcs(e)	(to_rcar_encoder(e)->slave.slave_funcs)
 34
 35static void rcar_du_hdmienc_disable(struct drm_encoder *encoder)
 36{
 37	struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
 38	const struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
 39
 40	if (sfuncs->dpms)
 41		sfuncs->dpms(encoder, DRM_MODE_DPMS_OFF);
 42
 43	if (hdmienc->renc->lvds)
 44		rcar_du_lvdsenc_enable(hdmienc->renc->lvds, encoder->crtc,
 45				       false);
 46
 47	hdmienc->enabled = false;
 48}
 49
 50static void rcar_du_hdmienc_enable(struct drm_encoder *encoder)
 51{
 52	struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
 53	const struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
 54
 55	if (hdmienc->renc->lvds)
 56		rcar_du_lvdsenc_enable(hdmienc->renc->lvds, encoder->crtc,
 57				       true);
 58
 59	if (sfuncs->dpms)
 60		sfuncs->dpms(encoder, DRM_MODE_DPMS_ON);
 61
 62	hdmienc->enabled = true;
 63}
 64
 65static int rcar_du_hdmienc_atomic_check(struct drm_encoder *encoder,
 66					struct drm_crtc_state *crtc_state,
 67					struct drm_connector_state *conn_state)
 68{
 69	struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
 70	const struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
 71	struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
 72	const struct drm_display_mode *mode = &crtc_state->mode;
 73
 74	if (hdmienc->renc->lvds)
 75		rcar_du_lvdsenc_atomic_check(hdmienc->renc->lvds,
 76					     adjusted_mode);
 77
 78	if (sfuncs->mode_fixup == NULL)
 79		return 0;
 80
 81	return sfuncs->mode_fixup(encoder, mode, adjusted_mode) ? 0 : -EINVAL;
 82}
 83
 84static void rcar_du_hdmienc_mode_set(struct drm_encoder *encoder,
 85				     struct drm_display_mode *mode,
 86				     struct drm_display_mode *adjusted_mode)
 87{
 88	struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
 89	const struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
 90
 91	if (sfuncs->mode_set)
 92		sfuncs->mode_set(encoder, mode, adjusted_mode);
 93
 94	rcar_du_crtc_route_output(encoder->crtc, hdmienc->renc->output);
 95}
 96
 97static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
 98	.mode_set = rcar_du_hdmienc_mode_set,
 99	.disable = rcar_du_hdmienc_disable,
100	.enable = rcar_du_hdmienc_enable,
101	.atomic_check = rcar_du_hdmienc_atomic_check,
102};
103
104static void rcar_du_hdmienc_cleanup(struct drm_encoder *encoder)
105{
106	struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
107
108	if (hdmienc->enabled)
109		rcar_du_hdmienc_disable(encoder);
110
111	drm_encoder_cleanup(encoder);
112	put_device(hdmienc->dev);
113}
114
115static const struct drm_encoder_funcs encoder_funcs = {
116	.destroy = rcar_du_hdmienc_cleanup,
117};
118
119int rcar_du_hdmienc_init(struct rcar_du_device *rcdu,
120			 struct rcar_du_encoder *renc, struct device_node *np)
121{
122	struct drm_encoder *encoder = rcar_encoder_to_drm_encoder(renc);
123	struct drm_i2c_encoder_driver *driver;
124	struct i2c_client *i2c_slave;
125	struct rcar_du_hdmienc *hdmienc;
126	int ret;
127
128	hdmienc = devm_kzalloc(rcdu->dev, sizeof(*hdmienc), GFP_KERNEL);
129	if (hdmienc == NULL)
130		return -ENOMEM;
131
132	/* Locate the slave I2C device and driver. */
133	i2c_slave = of_find_i2c_device_by_node(np);
134	if (!i2c_slave || !i2c_get_clientdata(i2c_slave)) {
135		dev_dbg(rcdu->dev,
136			"can't get I2C slave for %s, deferring probe\n",
137			of_node_full_name(np));
138		return -EPROBE_DEFER;
139	}
140
141	hdmienc->dev = &i2c_slave->dev;
142
143	if (hdmienc->dev->driver == NULL) {
144		dev_dbg(rcdu->dev,
145			"I2C slave %s not probed yet, deferring probe\n",
146			dev_name(hdmienc->dev));
147		ret = -EPROBE_DEFER;
148		goto error;
149	}
150
151	/* Initialize the slave encoder. */
152	driver = to_drm_i2c_encoder_driver(to_i2c_driver(hdmienc->dev->driver));
153	ret = driver->encoder_init(i2c_slave, rcdu->ddev, &renc->slave);
154	if (ret < 0)
155		goto error;
156
157	ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
158			       DRM_MODE_ENCODER_TMDS, NULL);
159	if (ret < 0)
160		goto error;
161
162	drm_encoder_helper_add(encoder, &encoder_helper_funcs);
163
164	renc->hdmi = hdmienc;
165	hdmienc->renc = renc;
166
167	return 0;
168
169error:
170	put_device(hdmienc->dev);
171	return ret;
172}