summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
blob: 92b69ae8caf9c41c9c6cb80249ed726faafde5f8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
/*
 * Copyright (C) 2013 Red Hat
 * Author: Rob Clark <robdclark@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "hdmi.h"

struct hdmi_bridge {
	struct drm_bridge base;
	struct hdmi *hdmi;
};
#define to_hdmi_bridge(x) container_of(x, struct hdmi_bridge, base)

void hdmi_bridge_destroy(struct drm_bridge *bridge)
{
}

static void power_on(struct drm_bridge *bridge)
{
	struct drm_device *dev = bridge->dev;
	struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
	struct hdmi *hdmi = hdmi_bridge->hdmi;
	const struct hdmi_platform_config *config = hdmi->config;
	int i, ret;

	for (i = 0; i < config->pwr_reg_cnt; i++) {
		ret = regulator_enable(hdmi->pwr_regs[i]);
		if (ret) {
			dev_err(dev->dev, "failed to enable pwr regulator: %s (%d)\n",
					config->pwr_reg_names[i], ret);
		}
	}

	if (config->pwr_clk_cnt > 0) {
		DBG("pixclock: %lu", hdmi->pixclock);
		ret = clk_set_rate(hdmi->pwr_clks[0], hdmi->pixclock);
		if (ret) {
			dev_err(dev->dev, "failed to set pixel clk: %s (%d)\n",
					config->pwr_clk_names[0], ret);
		}
	}

	for (i = 0; i < config->pwr_clk_cnt; i++) {
		ret = clk_prepare_enable(hdmi->pwr_clks[i]);
		if (ret) {
			dev_err(dev->dev, "failed to enable pwr clk: %s (%d)\n",
					config->pwr_clk_names[i], ret);
		}
	}
}

static void power_off(struct drm_bridge *bridge)
{
	struct drm_device *dev = bridge->dev;
	struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
	struct hdmi *hdmi = hdmi_bridge->hdmi;
	const struct hdmi_platform_config *config = hdmi->config;
	int i, ret;

	/* TODO do we need to wait for final vblank somewhere before
	 * cutting the clocks?
	 */
	mdelay(16 + 4);

	for (i = 0; i < config->pwr_clk_cnt; i++)
		clk_disable_unprepare(hdmi->pwr_clks[i]);

	for (i = 0; i < config->pwr_reg_cnt; i++) {
		ret = regulator_disable(hdmi->pwr_regs[i]);
		if (ret) {
			dev_err(dev->dev, "failed to disable pwr regulator: %s (%d)\n",
					config->pwr_reg_names[i], ret);
		}
	}
}

static void hdmi_bridge_pre_enable(struct drm_bridge *bridge)
{
	struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
	struct hdmi *hdmi = hdmi_bridge->hdmi;
	struct hdmi_phy *phy = hdmi->phy;

	DBG("power up");

	if (!hdmi->power_on) {
		power_on(bridge);
		hdmi->power_on = true;
		hdmi_audio_update(hdmi);
	}

	if (phy)
		phy->funcs->powerup(phy, hdmi->pixclock);

	hdmi_set_mode(hdmi, true);

	if (hdmi->hdcp_ctrl)
		hdmi_hdcp_on(hdmi->hdcp_ctrl);
}

static void hdmi_bridge_enable(struct drm_bridge *bridge)
{
}

static void hdmi_bridge_disable(struct drm_bridge *bridge)
{
}

static void hdmi_bridge_post_disable(struct drm_bridge *bridge)
{
	struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
	struct hdmi *hdmi = hdmi_bridge->hdmi;
	struct hdmi_phy *phy = hdmi->phy;

	if (hdmi->hdcp_ctrl)
		hdmi_hdcp_off(hdmi->hdcp_ctrl);

	DBG("power down");
	hdmi_set_mode(hdmi, false);

	if (phy)
		phy->funcs->powerdown(phy);

	if (hdmi->power_on) {
		power_off(bridge);
		hdmi->power_on = false;
		hdmi_audio_update(hdmi);
	}
}

static void hdmi_bridge_mode_set(struct drm_bridge *bridge,
		 struct drm_display_mode *mode,
		 struct drm_display_mode *adjusted_mode)
{
	struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
	struct hdmi *hdmi = hdmi_bridge->hdmi;
	int hstart, hend, vstart, vend;
	uint32_t frame_ctrl;

	mode = adjusted_mode;

	hdmi->pixclock = mode->clock * 1000;

	hstart = mode->htotal - mode->hsync_start;
	hend   = mode->htotal - mode->hsync_start + mode->hdisplay;

	vstart = mode->vtotal - mode->vsync_start - 1;
	vend   = mode->vtotal - mode->vsync_start + mode->vdisplay - 1;

	DBG("htotal=%d, vtotal=%d, hstart=%d, hend=%d, vstart=%d, vend=%d",
			mode->htotal, mode->vtotal, hstart, hend, vstart, vend);

	hdmi_write(hdmi, REG_HDMI_TOTAL,
			HDMI_TOTAL_H_TOTAL(mode->htotal - 1) |
			HDMI_TOTAL_V_TOTAL(mode->vtotal - 1));

	hdmi_write(hdmi, REG_HDMI_ACTIVE_HSYNC,
			HDMI_ACTIVE_HSYNC_START(hstart) |
			HDMI_ACTIVE_HSYNC_END(hend));
	hdmi_write(hdmi, REG_HDMI_ACTIVE_VSYNC,
			HDMI_ACTIVE_VSYNC_START(vstart) |
			HDMI_ACTIVE_VSYNC_END(vend));

	if (mode->flags & DRM_MODE_FLAG_INTERLACE) {
		hdmi_write(hdmi, REG_HDMI_VSYNC_TOTAL_F2,
				HDMI_VSYNC_TOTAL_F2_V_TOTAL(mode->vtotal));
		hdmi_write(hdmi, REG_HDMI_VSYNC_ACTIVE_F2,
				HDMI_VSYNC_ACTIVE_F2_START(vstart + 1) |
				HDMI_VSYNC_ACTIVE_F2_END(vend + 1));
	} else {
		hdmi_write(hdmi, REG_HDMI_VSYNC_TOTAL_F2,
				HDMI_VSYNC_TOTAL_F2_V_TOTAL(0));
		hdmi_write(hdmi, REG_HDMI_VSYNC_ACTIVE_F2,
				HDMI_VSYNC_ACTIVE_F2_START(0) |
				HDMI_VSYNC_ACTIVE_F2_END(0));
	}

	frame_ctrl = 0;
	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
		frame_ctrl |= HDMI_FRAME_CTRL_HSYNC_LOW;
	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
		frame_ctrl |= HDMI_FRAME_CTRL_VSYNC_LOW;
	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
		frame_ctrl |= HDMI_FRAME_CTRL_INTERLACED_EN;
	DBG("frame_ctrl=%08x", frame_ctrl);
	hdmi_write(hdmi, REG_HDMI_FRAME_CTRL, frame_ctrl);

	hdmi_audio_update(hdmi);
}

static const struct drm_bridge_funcs hdmi_bridge_funcs = {
		.pre_enable = hdmi_bridge_pre_enable,
		.enable = hdmi_bridge_enable,
		.disable = hdmi_bridge_disable,
		.post_disable = hdmi_bridge_post_disable,
		.mode_set = hdmi_bridge_mode_set,
};


/* initialize bridge */
struct drm_bridge *hdmi_bridge_init(struct hdmi *hdmi)
{
	struct drm_bridge *bridge = NULL;
	struct hdmi_bridge *hdmi_bridge;
	int ret;

	hdmi_bridge = devm_kzalloc(hdmi->dev->dev,
			sizeof(*hdmi_bridge), GFP_KERNEL);
	if (!hdmi_bridge) {
		ret = -ENOMEM;
		goto fail;
	}

	hdmi_bridge->hdmi = hdmi;

	bridge = &hdmi_bridge->base;
	bridge->funcs = &hdmi_bridge_funcs;

	ret = drm_bridge_attach(hdmi->dev, bridge);
	if (ret)
		goto fail;

	return bridge;

fail:
	if (bridge)
		hdmi_bridge_destroy(bridge);

	return ERR_PTR(ret);
}