1 /* $NetBSD: intel_dsi_dcs_backlight.c,v 1.2 2021/12/18 23:45:30 riastradh Exp $ */
2
3 /*
4 * Copyright © 2016 Intel Corporation
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
15 * Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
22 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
23 * DEALINGS IN THE SOFTWARE.
24 *
25 * Author: Deepak M <m.deepak at intel.com>
26 */
27
28 #include <sys/cdefs.h>
29 __KERNEL_RCSID(0, "$NetBSD: intel_dsi_dcs_backlight.c,v 1.2 2021/12/18 23:45:30 riastradh Exp $");
30
31 #include <drm/drm_mipi_dsi.h>
32 #include <video/mipi_display.h>
33
34 #include "i915_drv.h"
35 #include "intel_display_types.h"
36 #include "intel_dsi.h"
37 #include "intel_dsi_dcs_backlight.h"
38
39 #define CONTROL_DISPLAY_BCTRL (1 << 5)
40 #define CONTROL_DISPLAY_DD (1 << 3)
41 #define CONTROL_DISPLAY_BL (1 << 2)
42
43 #define POWER_SAVE_OFF (0 << 0)
44 #define POWER_SAVE_LOW (1 << 0)
45 #define POWER_SAVE_MEDIUM (2 << 0)
46 #define POWER_SAVE_HIGH (3 << 0)
47 #define POWER_SAVE_OUTDOOR_MODE (4 << 0)
48
49 #define PANEL_PWM_MAX_VALUE 0xFF
50
dcs_get_backlight(struct intel_connector * connector)51 static u32 dcs_get_backlight(struct intel_connector *connector)
52 {
53 struct intel_encoder *encoder = connector->encoder;
54 struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
55 struct mipi_dsi_device *dsi_device;
56 u8 data = 0;
57 enum port port;
58
59 /* FIXME: Need to take care of 16 bit brightness level */
60 for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
61 dsi_device = intel_dsi->dsi_hosts[port]->device;
62 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
63 &data, sizeof(data));
64 break;
65 }
66
67 return data;
68 }
69
dcs_set_backlight(const struct drm_connector_state * conn_state,u32 level)70 static void dcs_set_backlight(const struct drm_connector_state *conn_state, u32 level)
71 {
72 struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
73 struct mipi_dsi_device *dsi_device;
74 u8 data = level;
75 enum port port;
76
77 /* FIXME: Need to take care of 16 bit brightness level */
78 for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
79 dsi_device = intel_dsi->dsi_hosts[port]->device;
80 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
81 &data, sizeof(data));
82 }
83 }
84
dcs_disable_backlight(const struct drm_connector_state * conn_state)85 static void dcs_disable_backlight(const struct drm_connector_state *conn_state)
86 {
87 struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
88 struct mipi_dsi_device *dsi_device;
89 enum port port;
90
91 dcs_set_backlight(conn_state, 0);
92
93 for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) {
94 u8 cabc = POWER_SAVE_OFF;
95
96 dsi_device = intel_dsi->dsi_hosts[port]->device;
97 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
98 &cabc, sizeof(cabc));
99 }
100
101 for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
102 u8 ctrl = 0;
103
104 dsi_device = intel_dsi->dsi_hosts[port]->device;
105
106 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
107 &ctrl, sizeof(ctrl));
108
109 ctrl &= ~CONTROL_DISPLAY_BL;
110 ctrl &= ~CONTROL_DISPLAY_DD;
111 ctrl &= ~CONTROL_DISPLAY_BCTRL;
112
113 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
114 &ctrl, sizeof(ctrl));
115 }
116 }
117
dcs_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state)118 static void dcs_enable_backlight(const struct intel_crtc_state *crtc_state,
119 const struct drm_connector_state *conn_state)
120 {
121 struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
122 struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
123 struct mipi_dsi_device *dsi_device;
124 enum port port;
125
126 for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
127 u8 ctrl = 0;
128
129 dsi_device = intel_dsi->dsi_hosts[port]->device;
130
131 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
132 &ctrl, sizeof(ctrl));
133
134 ctrl |= CONTROL_DISPLAY_BL;
135 ctrl |= CONTROL_DISPLAY_DD;
136 ctrl |= CONTROL_DISPLAY_BCTRL;
137
138 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
139 &ctrl, sizeof(ctrl));
140 }
141
142 for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) {
143 u8 cabc = POWER_SAVE_MEDIUM;
144
145 dsi_device = intel_dsi->dsi_hosts[port]->device;
146 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
147 &cabc, sizeof(cabc));
148 }
149
150 dcs_set_backlight(conn_state, panel->backlight.level);
151 }
152
dcs_setup_backlight(struct intel_connector * connector,enum pipe unused)153 static int dcs_setup_backlight(struct intel_connector *connector,
154 enum pipe unused)
155 {
156 struct intel_panel *panel = &connector->panel;
157
158 panel->backlight.max = PANEL_PWM_MAX_VALUE;
159 panel->backlight.level = PANEL_PWM_MAX_VALUE;
160
161 return 0;
162 }
163
intel_dsi_dcs_init_backlight_funcs(struct intel_connector * intel_connector)164 int intel_dsi_dcs_init_backlight_funcs(struct intel_connector *intel_connector)
165 {
166 struct drm_device *dev = intel_connector->base.dev;
167 struct drm_i915_private *dev_priv = to_i915(dev);
168 struct intel_encoder *encoder = intel_connector->encoder;
169 struct intel_panel *panel = &intel_connector->panel;
170
171 if (dev_priv->vbt.backlight.type != INTEL_BACKLIGHT_DSI_DCS)
172 return -ENODEV;
173
174 if (WARN_ON(encoder->type != INTEL_OUTPUT_DSI))
175 return -EINVAL;
176
177 panel->backlight.setup = dcs_setup_backlight;
178 panel->backlight.enable = dcs_enable_backlight;
179 panel->backlight.disable = dcs_disable_backlight;
180 panel->backlight.set = dcs_set_backlight;
181 panel->backlight.get = dcs_get_backlight;
182
183 return 0;
184 }
185