1/*
2 * rcar_du_encoder.c  --  R-Car Display Unit Encoder
3 *
4 * Copyright (C) 2013-2014 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/export.h>
15
16#include <drm/drmP.h>
17#include <drm/drm_crtc.h>
18#include <drm/drm_crtc_helper.h>
19
20#include "rcar_du_drv.h"
21#include "rcar_du_encoder.h"
22#include "rcar_du_hdmicon.h"
23#include "rcar_du_hdmienc.h"
24#include "rcar_du_kms.h"
25#include "rcar_du_lvdscon.h"
26#include "rcar_du_lvdsenc.h"
27#include "rcar_du_vgacon.h"
28
29/* -----------------------------------------------------------------------------
30 * Common connector functions
31 */
32
33struct drm_encoder *
34rcar_du_connector_best_encoder(struct drm_connector *connector)
35{
36	struct rcar_du_connector *rcon = to_rcar_connector(connector);
37
38	return rcar_encoder_to_drm_encoder(rcon->encoder);
39}
40
41/* -----------------------------------------------------------------------------
42 * Encoder
43 */
44
45static void rcar_du_encoder_disable(struct drm_encoder *encoder)
46{
47	struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
48
49	if (renc->lvds)
50		rcar_du_lvdsenc_enable(renc->lvds, encoder->crtc, false);
51}
52
53static void rcar_du_encoder_enable(struct drm_encoder *encoder)
54{
55	struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
56
57	if (renc->lvds)
58		rcar_du_lvdsenc_enable(renc->lvds, encoder->crtc, true);
59}
60
61static int rcar_du_encoder_atomic_check(struct drm_encoder *encoder,
62					struct drm_crtc_state *crtc_state,
63					struct drm_connector_state *conn_state)
64{
65	struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
66	struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
67	const struct drm_display_mode *mode = &crtc_state->mode;
68	const struct drm_display_mode *panel_mode;
69	struct drm_connector *connector = conn_state->connector;
70	struct drm_device *dev = encoder->dev;
71
72	/* DAC encoders have currently no restriction on the mode. */
73	if (encoder->encoder_type == DRM_MODE_ENCODER_DAC)
74		return 0;
75
76	if (list_empty(&connector->modes)) {
77		dev_dbg(dev->dev, "encoder: empty modes list\n");
78		return -EINVAL;
79	}
80
81	panel_mode = list_first_entry(&connector->modes,
82				      struct drm_display_mode, head);
83
84	/* We're not allowed to modify the resolution. */
85	if (mode->hdisplay != panel_mode->hdisplay ||
86	    mode->vdisplay != panel_mode->vdisplay)
87		return -EINVAL;
88
89	/* The flat panel mode is fixed, just copy it to the adjusted mode. */
90	drm_mode_copy(adjusted_mode, panel_mode);
91
92	/* The internal LVDS encoder has a clock frequency operating range of
93	 * 30MHz to 150MHz. Clamp the clock accordingly.
94	 */
95	if (renc->lvds)
96		adjusted_mode->clock = clamp(adjusted_mode->clock,
97					     30000, 150000);
98
99	return 0;
100}
101
102static void rcar_du_encoder_mode_set(struct drm_encoder *encoder,
103				     struct drm_display_mode *mode,
104				     struct drm_display_mode *adjusted_mode)
105{
106	struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
107
108	rcar_du_crtc_route_output(encoder->crtc, renc->output);
109}
110
111static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
112	.mode_set = rcar_du_encoder_mode_set,
113	.disable = rcar_du_encoder_disable,
114	.enable = rcar_du_encoder_enable,
115	.atomic_check = rcar_du_encoder_atomic_check,
116};
117
118static const struct drm_encoder_funcs encoder_funcs = {
119	.destroy = drm_encoder_cleanup,
120};
121
122int rcar_du_encoder_init(struct rcar_du_device *rcdu,
123			 enum rcar_du_encoder_type type,
124			 enum rcar_du_output output,
125			 struct device_node *enc_node,
126			 struct device_node *con_node)
127{
128	struct rcar_du_encoder *renc;
129	struct drm_encoder *encoder;
130	unsigned int encoder_type;
131	int ret;
132
133	renc = devm_kzalloc(rcdu->dev, sizeof(*renc), GFP_KERNEL);
134	if (renc == NULL)
135		return -ENOMEM;
136
137	renc->output = output;
138	encoder = rcar_encoder_to_drm_encoder(renc);
139
140	switch (output) {
141	case RCAR_DU_OUTPUT_LVDS0:
142		renc->lvds = rcdu->lvds[0];
143		break;
144
145	case RCAR_DU_OUTPUT_LVDS1:
146		renc->lvds = rcdu->lvds[1];
147		break;
148
149	default:
150		break;
151	}
152
153	switch (type) {
154	case RCAR_DU_ENCODER_VGA:
155		encoder_type = DRM_MODE_ENCODER_DAC;
156		break;
157	case RCAR_DU_ENCODER_LVDS:
158		encoder_type = DRM_MODE_ENCODER_LVDS;
159		break;
160	case RCAR_DU_ENCODER_HDMI:
161		encoder_type = DRM_MODE_ENCODER_TMDS;
162		break;
163	case RCAR_DU_ENCODER_NONE:
164	default:
165		/* No external encoder, use the internal encoder type. */
166		encoder_type = rcdu->info->routes[output].encoder_type;
167		break;
168	}
169
170	if (type == RCAR_DU_ENCODER_HDMI) {
171		ret = rcar_du_hdmienc_init(rcdu, renc, enc_node);
172		if (ret < 0)
173			goto done;
174	} else {
175		ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
176				       encoder_type);
177		if (ret < 0)
178			goto done;
179
180		drm_encoder_helper_add(encoder, &encoder_helper_funcs);
181	}
182
183	switch (encoder_type) {
184	case DRM_MODE_ENCODER_LVDS:
185		ret = rcar_du_lvds_connector_init(rcdu, renc, con_node);
186		break;
187
188	case DRM_MODE_ENCODER_DAC:
189		ret = rcar_du_vga_connector_init(rcdu, renc);
190		break;
191
192	case DRM_MODE_ENCODER_TMDS:
193		ret = rcar_du_hdmi_connector_init(rcdu, renc);
194		break;
195
196	default:
197		ret = -EINVAL;
198		break;
199	}
200
201done:
202	if (ret < 0) {
203		if (encoder->name)
204			encoder->funcs->destroy(encoder);
205		devm_kfree(rcdu->dev, renc);
206	}
207
208	return ret;
209}
210