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 mipi_dsi_device *dsi_device;
51 u8 data = 0;
52 enum port port;
53
54 /* FIXME: Need to take care of 16 bit brightness level */
55 for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
56 dsi_device = intel_dsi->dsi_hosts[port]->device;
57 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
58 &data, sizeof(data));
59 break;
60 }
61
62 return data;
63 }
64
dcs_set_backlight(const struct drm_connector_state * conn_state,u32 level)65 static void dcs_set_backlight(const struct drm_connector_state *conn_state, u32 level)
66 {
67 struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
68 struct mipi_dsi_device *dsi_device;
69 u8 data = level;
70 enum port port;
71
72 /* FIXME: Need to take care of 16 bit brightness level */
73 for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
74 dsi_device = intel_dsi->dsi_hosts[port]->device;
75 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
76 &data, sizeof(data));
77 }
78 }
79
dcs_disable_backlight(const struct drm_connector_state * conn_state,u32 level)80 static void dcs_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
81 {
82 struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
83 struct mipi_dsi_device *dsi_device;
84 enum port port;
85
86 dcs_set_backlight(conn_state, 0);
87
88 for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) {
89 u8 cabc = POWER_SAVE_OFF;
90
91 dsi_device = intel_dsi->dsi_hosts[port]->device;
92 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
93 &cabc, sizeof(cabc));
94 }
95
96 for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
97 u8 ctrl = 0;
98
99 dsi_device = intel_dsi->dsi_hosts[port]->device;
100
101 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
102 &ctrl, sizeof(ctrl));
103
104 ctrl &= ~CONTROL_DISPLAY_BL;
105 ctrl &= ~CONTROL_DISPLAY_DD;
106 ctrl &= ~CONTROL_DISPLAY_BCTRL;
107
108 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
109 &ctrl, sizeof(ctrl));
110 }
111 }
112
dcs_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)113 static void dcs_enable_backlight(const struct intel_crtc_state *crtc_state,
114 const struct drm_connector_state *conn_state, u32 level)
115 {
116 struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
117 struct mipi_dsi_device *dsi_device;
118 enum port port;
119
120 for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
121 u8 ctrl = 0;
122
123 dsi_device = intel_dsi->dsi_hosts[port]->device;
124
125 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
126 &ctrl, sizeof(ctrl));
127
128 ctrl |= CONTROL_DISPLAY_BL;
129 ctrl |= CONTROL_DISPLAY_DD;
130 ctrl |= CONTROL_DISPLAY_BCTRL;
131
132 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
133 &ctrl, sizeof(ctrl));
134 }
135
136 for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) {
137 u8 cabc = POWER_SAVE_MEDIUM;
138
139 dsi_device = intel_dsi->dsi_hosts[port]->device;
140 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
141 &cabc, sizeof(cabc));
142 }
143
144 dcs_set_backlight(conn_state, level);
145 }
146
dcs_setup_backlight(struct intel_connector * connector,enum pipe unused)147 static int dcs_setup_backlight(struct intel_connector *connector,
148 enum pipe unused)
149 {
150 struct intel_panel *panel = &connector->panel;
151
152 panel->backlight.max = PANEL_PWM_MAX_VALUE;
153 panel->backlight.level = PANEL_PWM_MAX_VALUE;
154
155 return 0;
156 }
157
158 static const struct intel_panel_bl_funcs dcs_bl_funcs = {
159 .setup = dcs_setup_backlight,
160 .enable = dcs_enable_backlight,
161 .disable = dcs_disable_backlight,
162 .set = dcs_set_backlight,
163 .get = dcs_get_backlight,
164 };
165
intel_dsi_dcs_init_backlight_funcs(struct intel_connector * intel_connector)166 int intel_dsi_dcs_init_backlight_funcs(struct intel_connector *intel_connector)
167 {
168 struct drm_device *dev = intel_connector->base.dev;
169 struct drm_i915_private *dev_priv = to_i915(dev);
170 struct intel_encoder *encoder = intel_attached_encoder(intel_connector);
171 struct intel_panel *panel = &intel_connector->panel;
172
173 if (dev_priv->vbt.backlight.type != INTEL_BACKLIGHT_DSI_DCS)
174 return -ENODEV;
175
176 if (drm_WARN_ON(dev, encoder->type != INTEL_OUTPUT_DSI))
177 return -EINVAL;
178
179 panel->backlight.funcs = &dcs_bl_funcs;
180
181 return 0;
182 }
183