1 /*
2  * Copyright © 2016 Intel Corporation
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21  * DEALINGS IN THE SOFTWARE.
22  *
23  * Author: Deepak M <m.deepak at intel.com>
24  */
25 
26 #include <drm/drm_mipi_dsi.h>
27 #include <video/mipi_display.h>
28 
29 #include "i915_drv.h"
30 #include "intel_display_types.h"
31 #include "intel_dsi.h"
32 #include "intel_dsi_dcs_backlight.h"
33 
34 #define CONTROL_DISPLAY_BCTRL		(1 << 5)
35 #define CONTROL_DISPLAY_DD		(1 << 3)
36 #define CONTROL_DISPLAY_BL		(1 << 2)
37 
38 #define POWER_SAVE_OFF			(0 << 0)
39 #define POWER_SAVE_LOW			(1 << 0)
40 #define POWER_SAVE_MEDIUM		(2 << 0)
41 #define POWER_SAVE_HIGH			(3 << 0)
42 #define POWER_SAVE_OUTDOOR_MODE		(4 << 0)
43 
44 #define PANEL_PWM_MAX_VALUE		0xFF
45 
46 static u32 dcs_get_backlight(struct intel_connector *connector, enum pipe unused)
47 {
48 	struct intel_encoder *encoder = intel_attached_encoder(connector);
49 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
50 	struct intel_panel *panel = &connector->panel;
51 	struct mipi_dsi_device *dsi_device;
52 	u8 data[2] = {};
53 	enum port port;
54 	size_t len = panel->backlight.max > U8_MAX ? 2 : 1;
55 
56 	for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
57 		dsi_device = intel_dsi->dsi_hosts[port]->device;
58 		mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
59 				  &data, len);
60 		break;
61 	}
62 
63 	return (data[1] << 8) | data[0];
64 }
65 
66 static void dcs_set_backlight(const struct drm_connector_state *conn_state, u32 level)
67 {
68 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
69 	struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
70 	struct mipi_dsi_device *dsi_device;
71 	u8 data[2] = {};
72 	enum port port;
73 	size_t len = panel->backlight.max > U8_MAX ? 2 : 1;
74 	unsigned long mode_flags;
75 
76 	if (len == 1) {
77 		data[0] = level;
78 	} else {
79 		data[0] = level >> 8;
80 		data[1] = level;
81 	}
82 
83 	for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
84 		dsi_device = intel_dsi->dsi_hosts[port]->device;
85 		mode_flags = dsi_device->mode_flags;
86 		dsi_device->mode_flags &= ~MIPI_DSI_MODE_LPM;
87 		mipi_dsi_dcs_write(dsi_device, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
88 				   &data, len);
89 		dsi_device->mode_flags = mode_flags;
90 	}
91 }
92 
93 static void dcs_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
94 {
95 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
96 	struct mipi_dsi_device *dsi_device;
97 	enum port port;
98 
99 	dcs_set_backlight(conn_state, 0);
100 
101 	for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) {
102 		u8 cabc = POWER_SAVE_OFF;
103 
104 		dsi_device = intel_dsi->dsi_hosts[port]->device;
105 		mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
106 				   &cabc, sizeof(cabc));
107 	}
108 
109 	for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
110 		u8 ctrl = 0;
111 
112 		dsi_device = intel_dsi->dsi_hosts[port]->device;
113 
114 		mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
115 				  &ctrl, sizeof(ctrl));
116 
117 		ctrl &= ~CONTROL_DISPLAY_BL;
118 		ctrl &= ~CONTROL_DISPLAY_DD;
119 		ctrl &= ~CONTROL_DISPLAY_BCTRL;
120 
121 		mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
122 				   &ctrl, sizeof(ctrl));
123 	}
124 }
125 
126 static void dcs_enable_backlight(const struct intel_crtc_state *crtc_state,
127 				 const struct drm_connector_state *conn_state, u32 level)
128 {
129 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
130 	struct mipi_dsi_device *dsi_device;
131 	enum port port;
132 
133 	for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
134 		u8 ctrl = 0;
135 
136 		dsi_device = intel_dsi->dsi_hosts[port]->device;
137 
138 		mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
139 				  &ctrl, sizeof(ctrl));
140 
141 		ctrl |= CONTROL_DISPLAY_BL;
142 		ctrl |= CONTROL_DISPLAY_DD;
143 		ctrl |= CONTROL_DISPLAY_BCTRL;
144 
145 		mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
146 				   &ctrl, sizeof(ctrl));
147 	}
148 
149 	for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) {
150 		u8 cabc = POWER_SAVE_MEDIUM;
151 
152 		dsi_device = intel_dsi->dsi_hosts[port]->device;
153 		mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
154 				   &cabc, sizeof(cabc));
155 	}
156 
157 	dcs_set_backlight(conn_state, level);
158 }
159 
160 static int dcs_setup_backlight(struct intel_connector *connector,
161 			       enum pipe unused)
162 {
163 	struct drm_device *dev = connector->base.dev;
164 	struct drm_i915_private *dev_priv = to_i915(dev);
165 	struct intel_panel *panel = &connector->panel;
166 
167 	if (dev_priv->vbt.backlight.brightness_precision_bits > 8)
168 		panel->backlight.max = (1 << dev_priv->vbt.backlight.brightness_precision_bits) - 1;
169 	else
170 		panel->backlight.max = PANEL_PWM_MAX_VALUE;
171 
172 	panel->backlight.level = panel->backlight.max;
173 
174 	return 0;
175 }
176 
177 static const struct intel_panel_bl_funcs dcs_bl_funcs = {
178 	.setup = dcs_setup_backlight,
179 	.enable = dcs_enable_backlight,
180 	.disable = dcs_disable_backlight,
181 	.set = dcs_set_backlight,
182 	.get = dcs_get_backlight,
183 };
184 
185 int intel_dsi_dcs_init_backlight_funcs(struct intel_connector *intel_connector)
186 {
187 	struct drm_device *dev = intel_connector->base.dev;
188 	struct drm_i915_private *dev_priv = to_i915(dev);
189 	struct intel_encoder *encoder = intel_attached_encoder(intel_connector);
190 	struct intel_panel *panel = &intel_connector->panel;
191 
192 	if (dev_priv->vbt.backlight.type != INTEL_BACKLIGHT_DSI_DCS)
193 		return -ENODEV;
194 
195 	if (drm_WARN_ON(dev, encoder->type != INTEL_OUTPUT_DSI))
196 		return -EINVAL;
197 
198 	panel->backlight.funcs = &dcs_bl_funcs;
199 
200 	return 0;
201 }
202