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
dcs_get_backlight(struct intel_connector * connector,enum pipe unused)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
dcs_set_backlight(const struct drm_connector_state * conn_state,u32 level)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
75 if (len == 1) {
76 data[0] = level;
77 } else {
78 data[0] = level >> 8;
79 data[1] = level;
80 }
81
82 for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
83 dsi_device = intel_dsi->dsi_hosts[port]->device;
84 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
85 &data, len);
86 }
87 }
88
dcs_disable_backlight(const struct drm_connector_state * conn_state,u32 level)89 static void dcs_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
90 {
91 struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
92 struct mipi_dsi_device *dsi_device;
93 enum port port;
94
95 dcs_set_backlight(conn_state, 0);
96
97 for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) {
98 u8 cabc = POWER_SAVE_OFF;
99
100 dsi_device = intel_dsi->dsi_hosts[port]->device;
101 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
102 &cabc, sizeof(cabc));
103 }
104
105 for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
106 u8 ctrl = 0;
107
108 dsi_device = intel_dsi->dsi_hosts[port]->device;
109
110 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
111 &ctrl, sizeof(ctrl));
112
113 ctrl &= ~CONTROL_DISPLAY_BL;
114 ctrl &= ~CONTROL_DISPLAY_DD;
115 ctrl &= ~CONTROL_DISPLAY_BCTRL;
116
117 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
118 &ctrl, sizeof(ctrl));
119 }
120 }
121
dcs_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)122 static void dcs_enable_backlight(const struct intel_crtc_state *crtc_state,
123 const struct drm_connector_state *conn_state, u32 level)
124 {
125 struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
126 struct mipi_dsi_device *dsi_device;
127 enum port port;
128
129 for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
130 u8 ctrl = 0;
131
132 dsi_device = intel_dsi->dsi_hosts[port]->device;
133
134 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
135 &ctrl, sizeof(ctrl));
136
137 ctrl |= CONTROL_DISPLAY_BL;
138 ctrl |= CONTROL_DISPLAY_DD;
139 ctrl |= CONTROL_DISPLAY_BCTRL;
140
141 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
142 &ctrl, sizeof(ctrl));
143 }
144
145 for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) {
146 u8 cabc = POWER_SAVE_MEDIUM;
147
148 dsi_device = intel_dsi->dsi_hosts[port]->device;
149 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
150 &cabc, sizeof(cabc));
151 }
152
153 dcs_set_backlight(conn_state, level);
154 }
155
dcs_setup_backlight(struct intel_connector * connector,enum pipe unused)156 static int dcs_setup_backlight(struct intel_connector *connector,
157 enum pipe unused)
158 {
159 struct drm_device *dev = connector->base.dev;
160 struct drm_i915_private *dev_priv = to_i915(dev);
161 struct intel_panel *panel = &connector->panel;
162
163 if (dev_priv->vbt.backlight.brightness_precision_bits > 8)
164 panel->backlight.max = (1 << dev_priv->vbt.backlight.brightness_precision_bits) - 1;
165 else
166 panel->backlight.max = PANEL_PWM_MAX_VALUE;
167
168 panel->backlight.level = panel->backlight.max;
169
170 return 0;
171 }
172
173 static const struct intel_panel_bl_funcs dcs_bl_funcs = {
174 .setup = dcs_setup_backlight,
175 .enable = dcs_enable_backlight,
176 .disable = dcs_disable_backlight,
177 .set = dcs_set_backlight,
178 .get = dcs_get_backlight,
179 };
180
intel_dsi_dcs_init_backlight_funcs(struct intel_connector * intel_connector)181 int intel_dsi_dcs_init_backlight_funcs(struct intel_connector *intel_connector)
182 {
183 struct drm_device *dev = intel_connector->base.dev;
184 struct drm_i915_private *dev_priv = to_i915(dev);
185 struct intel_encoder *encoder = intel_attached_encoder(intel_connector);
186 struct intel_panel *panel = &intel_connector->panel;
187
188 if (dev_priv->vbt.backlight.type != INTEL_BACKLIGHT_DSI_DCS)
189 return -ENODEV;
190
191 if (drm_WARN_ON(dev, encoder->type != INTEL_OUTPUT_DSI))
192 return -EINVAL;
193
194 panel->backlight.funcs = &dcs_bl_funcs;
195
196 return 0;
197 }
198