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 <drm/drm_print.h>
28#include <video/mipi_display.h>
29
30#include "intel_display_core.h"
31#include "intel_display_types.h"
32#include "intel_dsi.h"
33#include "intel_dsi_dcs_backlight.h"
34
35#define CONTROL_DISPLAY_BCTRL (1 << 5)
36#define CONTROL_DISPLAY_DD (1 << 3)
37#define CONTROL_DISPLAY_BL (1 << 2)
38
39#define POWER_SAVE_OFF (0 << 0)
40#define POWER_SAVE_LOW (1 << 0)
41#define POWER_SAVE_MEDIUM (2 << 0)
42#define POWER_SAVE_HIGH (3 << 0)
43#define POWER_SAVE_OUTDOOR_MODE (4 << 0)
44
45#define PANEL_PWM_MAX_VALUE 0xFF
46
47static u32 dcs_get_backlight(struct intel_connector *connector, enum pipe unused)
48{
49 struct intel_encoder *encoder = intel_attached_encoder(connector);
50 struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
51 struct intel_panel *panel = &connector->panel;
52 struct mipi_dsi_device *dsi_device;
53 u8 data[2] = {};
54 enum port port;
55 size_t len = panel->backlight.max > U8_MAX ? 2 : 1;
56
57 for_each_dsi_port(port, panel->vbt.dsi.bl_ports) {
58 dsi_device = intel_dsi->dsi_hosts[port]->device;
59 mipi_dsi_dcs_read(dsi: dsi_device, cmd: MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
60 data: &data, len);
61 break;
62 }
63
64 return (data[1] << 8) | data[0];
65}
66
67static void dcs_set_backlight(const struct drm_connector_state *conn_state, u32 level)
68{
69 struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
70 struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
71 struct mipi_dsi_device *dsi_device;
72 u8 data[2] = {};
73 enum port port;
74 size_t len = panel->backlight.max > U8_MAX ? 2 : 1;
75 unsigned long mode_flags;
76
77 if (len == 1) {
78 data[0] = level;
79 } else {
80 data[0] = level >> 8;
81 data[1] = level;
82 }
83
84 for_each_dsi_port(port, panel->vbt.dsi.bl_ports) {
85 dsi_device = intel_dsi->dsi_hosts[port]->device;
86 mode_flags = dsi_device->mode_flags;
87 dsi_device->mode_flags &= ~MIPI_DSI_MODE_LPM;
88 mipi_dsi_dcs_write(dsi: dsi_device, cmd: MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
89 data: &data, len);
90 dsi_device->mode_flags = mode_flags;
91 }
92}
93
94static void dcs_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
95{
96 struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
97 struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
98 struct mipi_dsi_device *dsi_device;
99 enum port port;
100
101 dcs_set_backlight(conn_state, level: 0);
102
103 for_each_dsi_port(port, panel->vbt.dsi.cabc_ports) {
104 u8 cabc = POWER_SAVE_OFF;
105
106 dsi_device = intel_dsi->dsi_hosts[port]->device;
107 mipi_dsi_dcs_write(dsi: dsi_device, cmd: MIPI_DCS_WRITE_POWER_SAVE,
108 data: &cabc, len: sizeof(cabc));
109 }
110
111 for_each_dsi_port(port, panel->vbt.dsi.bl_ports) {
112 u8 ctrl = 0;
113
114 dsi_device = intel_dsi->dsi_hosts[port]->device;
115
116 mipi_dsi_dcs_read(dsi: dsi_device, cmd: MIPI_DCS_GET_CONTROL_DISPLAY,
117 data: &ctrl, len: sizeof(ctrl));
118
119 ctrl &= ~CONTROL_DISPLAY_BL;
120 ctrl &= ~CONTROL_DISPLAY_DD;
121 ctrl &= ~CONTROL_DISPLAY_BCTRL;
122
123 mipi_dsi_dcs_write(dsi: dsi_device, cmd: MIPI_DCS_WRITE_CONTROL_DISPLAY,
124 data: &ctrl, len: sizeof(ctrl));
125 }
126}
127
128static void dcs_enable_backlight(const struct intel_crtc_state *crtc_state,
129 const struct drm_connector_state *conn_state, u32 level)
130{
131 struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
132 struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
133 struct mipi_dsi_device *dsi_device;
134 enum port port;
135
136 for_each_dsi_port(port, panel->vbt.dsi.bl_ports) {
137 u8 ctrl = 0;
138
139 dsi_device = intel_dsi->dsi_hosts[port]->device;
140
141 mipi_dsi_dcs_read(dsi: dsi_device, cmd: MIPI_DCS_GET_CONTROL_DISPLAY,
142 data: &ctrl, len: sizeof(ctrl));
143
144 ctrl |= CONTROL_DISPLAY_BL;
145 ctrl |= CONTROL_DISPLAY_DD;
146 ctrl |= CONTROL_DISPLAY_BCTRL;
147
148 mipi_dsi_dcs_write(dsi: dsi_device, cmd: MIPI_DCS_WRITE_CONTROL_DISPLAY,
149 data: &ctrl, len: sizeof(ctrl));
150 }
151
152 for_each_dsi_port(port, panel->vbt.dsi.cabc_ports) {
153 u8 cabc = POWER_SAVE_MEDIUM;
154
155 dsi_device = intel_dsi->dsi_hosts[port]->device;
156 mipi_dsi_dcs_write(dsi: dsi_device, cmd: MIPI_DCS_WRITE_POWER_SAVE,
157 data: &cabc, len: sizeof(cabc));
158 }
159
160 dcs_set_backlight(conn_state, level);
161}
162
163static int dcs_setup_backlight(struct intel_connector *connector,
164 enum pipe unused)
165{
166 struct intel_display *display = to_intel_display(connector);
167 struct intel_panel *panel = &connector->panel;
168
169 if (panel->vbt.backlight.brightness_precision_bits > 8)
170 panel->backlight.max = (1 << panel->vbt.backlight.brightness_precision_bits) - 1;
171 else
172 panel->backlight.max = PANEL_PWM_MAX_VALUE;
173
174 panel->backlight.level = panel->backlight.max;
175
176 drm_dbg_kms(display->drm,
177 "[CONNECTOR:%d:%s] Using DCS for backlight control\n",
178 connector->base.base.id, connector->base.name);
179
180 return 0;
181}
182
183static const struct intel_panel_bl_funcs dcs_bl_funcs = {
184 .setup = dcs_setup_backlight,
185 .enable = dcs_enable_backlight,
186 .disable = dcs_disable_backlight,
187 .set = dcs_set_backlight,
188 .get = dcs_get_backlight,
189};
190
191int intel_dsi_dcs_init_backlight_funcs(struct intel_connector *intel_connector)
192{
193 struct drm_device *dev = intel_connector->base.dev;
194 struct intel_encoder *encoder = intel_attached_encoder(connector: intel_connector);
195 struct intel_panel *panel = &intel_connector->panel;
196
197 if (panel->vbt.backlight.type != INTEL_BACKLIGHT_DSI_DCS)
198 return -ENODEV;
199
200 if (drm_WARN_ON(dev, encoder->type != INTEL_OUTPUT_DSI))
201 return -EINVAL;
202
203 panel->backlight.funcs = &dcs_bl_funcs;
204
205 return 0;
206}
207

source code of linux/drivers/gpu/drm/i915/display/intel_dsi_dcs_backlight.c