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, panel->vbt.dsi.bl_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 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, panel->vbt.dsi.bl_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
dcs_disable_backlight(const struct drm_connector_state * conn_state,u32 level)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 intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
97 struct mipi_dsi_device *dsi_device;
98 enum port port;
99
100 dcs_set_backlight(conn_state, 0);
101
102 for_each_dsi_port(port, panel->vbt.dsi.cabc_ports) {
103 u8 cabc = POWER_SAVE_OFF;
104
105 dsi_device = intel_dsi->dsi_hosts[port]->device;
106 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
107 &cabc, sizeof(cabc));
108 }
109
110 for_each_dsi_port(port, panel->vbt.dsi.bl_ports) {
111 u8 ctrl = 0;
112
113 dsi_device = intel_dsi->dsi_hosts[port]->device;
114
115 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
116 &ctrl, sizeof(ctrl));
117
118 ctrl &= ~CONTROL_DISPLAY_BL;
119 ctrl &= ~CONTROL_DISPLAY_DD;
120 ctrl &= ~CONTROL_DISPLAY_BCTRL;
121
122 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
123 &ctrl, sizeof(ctrl));
124 }
125 }
126
dcs_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)127 static void dcs_enable_backlight(const struct intel_crtc_state *crtc_state,
128 const struct drm_connector_state *conn_state, u32 level)
129 {
130 struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
131 struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
132 struct mipi_dsi_device *dsi_device;
133 enum port port;
134
135 for_each_dsi_port(port, panel->vbt.dsi.bl_ports) {
136 u8 ctrl = 0;
137
138 dsi_device = intel_dsi->dsi_hosts[port]->device;
139
140 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
141 &ctrl, sizeof(ctrl));
142
143 ctrl |= CONTROL_DISPLAY_BL;
144 ctrl |= CONTROL_DISPLAY_DD;
145 ctrl |= CONTROL_DISPLAY_BCTRL;
146
147 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
148 &ctrl, sizeof(ctrl));
149 }
150
151 for_each_dsi_port(port, panel->vbt.dsi.cabc_ports) {
152 u8 cabc = POWER_SAVE_MEDIUM;
153
154 dsi_device = intel_dsi->dsi_hosts[port]->device;
155 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
156 &cabc, sizeof(cabc));
157 }
158
159 dcs_set_backlight(conn_state, level);
160 }
161
dcs_setup_backlight(struct intel_connector * connector,enum pipe unused)162 static int dcs_setup_backlight(struct intel_connector *connector,
163 enum pipe unused)
164 {
165 struct drm_i915_private *i915 = to_i915(connector->base.dev);
166 struct intel_panel *panel = &connector->panel;
167
168 if (panel->vbt.backlight.brightness_precision_bits > 8)
169 panel->backlight.max = (1 << panel->vbt.backlight.brightness_precision_bits) - 1;
170 else
171 panel->backlight.max = PANEL_PWM_MAX_VALUE;
172
173 panel->backlight.level = panel->backlight.max;
174
175 drm_dbg_kms(&i915->drm,
176 "[CONNECTOR:%d:%s] Using DCS for backlight control\n",
177 connector->base.base.id, connector->base.name);
178
179 return 0;
180 }
181
182 static const struct intel_panel_bl_funcs dcs_bl_funcs = {
183 .setup = dcs_setup_backlight,
184 .enable = dcs_enable_backlight,
185 .disable = dcs_disable_backlight,
186 .set = dcs_set_backlight,
187 .get = dcs_get_backlight,
188 };
189
intel_dsi_dcs_init_backlight_funcs(struct intel_connector * intel_connector)190 int intel_dsi_dcs_init_backlight_funcs(struct intel_connector *intel_connector)
191 {
192 struct drm_device *dev = intel_connector->base.dev;
193 struct intel_encoder *encoder = intel_attached_encoder(intel_connector);
194 struct intel_panel *panel = &intel_connector->panel;
195
196 if (panel->vbt.backlight.type != INTEL_BACKLIGHT_DSI_DCS)
197 return -ENODEV;
198
199 if (drm_WARN_ON(dev, encoder->type != INTEL_OUTPUT_DSI))
200 return -EINVAL;
201
202 panel->backlight.funcs = &dcs_bl_funcs;
203
204 return 0;
205 }
206