]>
Commit | Line | Data |
---|---|---|
e7156c83 YA |
1 | /* |
2 | * Copyright © 2015 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 DEALINGS | |
21 | * IN THE SOFTWARE. | |
22 | * | |
23 | */ | |
24 | ||
25 | #include "intel_drv.h" | |
26 | ||
27 | static void set_aux_backlight_enable(struct intel_dp *intel_dp, bool enable) | |
28 | { | |
29 | uint8_t reg_val = 0; | |
30 | ||
31 | if (drm_dp_dpcd_readb(&intel_dp->aux, DP_EDP_DISPLAY_CONTROL_REGISTER, | |
32 | ®_val) < 0) { | |
33 | DRM_DEBUG_KMS("Failed to read DPCD register 0x%x\n", | |
34 | DP_EDP_DISPLAY_CONTROL_REGISTER); | |
35 | return; | |
36 | } | |
37 | if (enable) | |
38 | reg_val |= DP_EDP_BACKLIGHT_ENABLE; | |
39 | else | |
40 | reg_val &= ~(DP_EDP_BACKLIGHT_ENABLE); | |
41 | ||
42 | if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_EDP_DISPLAY_CONTROL_REGISTER, | |
43 | reg_val) != 1) { | |
44 | DRM_DEBUG_KMS("Failed to %s aux backlight\n", | |
45 | enable ? "enable" : "disable"); | |
46 | } | |
47 | } | |
48 | ||
49 | /* | |
50 | * Read the current backlight value from DPCD register(s) based | |
51 | * on if 8-bit(MSB) or 16-bit(MSB and LSB) values are supported | |
52 | */ | |
53 | static uint32_t intel_dp_aux_get_backlight(struct intel_connector *connector) | |
54 | { | |
55 | struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base); | |
56 | uint8_t read_val[2] = { 0x0 }; | |
57 | uint16_t level = 0; | |
58 | ||
59 | if (drm_dp_dpcd_read(&intel_dp->aux, DP_EDP_BACKLIGHT_BRIGHTNESS_MSB, | |
60 | &read_val, sizeof(read_val)) < 0) { | |
61 | DRM_DEBUG_KMS("Failed to read DPCD register 0x%x\n", | |
62 | DP_EDP_BACKLIGHT_BRIGHTNESS_MSB); | |
63 | return 0; | |
64 | } | |
65 | level = read_val[0]; | |
66 | if (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT) | |
67 | level = (read_val[0] << 8 | read_val[1]); | |
68 | ||
69 | return level; | |
70 | } | |
71 | ||
72 | /* | |
73 | * Sends the current backlight level over the aux channel, checking if its using | |
74 | * 8-bit or 16 bit value (MSB and LSB) | |
75 | */ | |
76 | static void | |
77 | intel_dp_aux_set_backlight(struct intel_connector *connector, u32 level) | |
78 | { | |
79 | struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base); | |
80 | uint8_t vals[2] = { 0x0 }; | |
81 | ||
82 | vals[0] = level; | |
83 | ||
84 | /* Write the MSB and/or LSB */ | |
85 | if (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT) { | |
86 | vals[0] = (level & 0xFF00) >> 8; | |
87 | vals[1] = (level & 0xFF); | |
88 | } | |
89 | if (drm_dp_dpcd_write(&intel_dp->aux, DP_EDP_BACKLIGHT_BRIGHTNESS_MSB, | |
90 | vals, sizeof(vals)) < 0) { | |
91 | DRM_DEBUG_KMS("Failed to write aux backlight level\n"); | |
92 | return; | |
93 | } | |
94 | } | |
95 | ||
96 | static void intel_dp_aux_enable_backlight(struct intel_connector *connector) | |
97 | { | |
98 | struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base); | |
99 | uint8_t dpcd_buf = 0; | |
100 | ||
101 | set_aux_backlight_enable(intel_dp, true); | |
102 | ||
103 | if ((drm_dp_dpcd_readb(&intel_dp->aux, | |
104 | DP_EDP_BACKLIGHT_MODE_SET_REGISTER, &dpcd_buf) == 1) && | |
105 | ((dpcd_buf & DP_EDP_BACKLIGHT_CONTROL_MODE_MASK) == | |
106 | DP_EDP_BACKLIGHT_CONTROL_MODE_PRESET)) | |
107 | drm_dp_dpcd_writeb(&intel_dp->aux, DP_EDP_BACKLIGHT_MODE_SET_REGISTER, | |
108 | (dpcd_buf | DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD)); | |
109 | } | |
110 | ||
111 | static void intel_dp_aux_disable_backlight(struct intel_connector *connector) | |
112 | { | |
113 | set_aux_backlight_enable(enc_to_intel_dp(&connector->encoder->base), false); | |
114 | } | |
115 | ||
116 | static int intel_dp_aux_setup_backlight(struct intel_connector *connector, | |
117 | enum pipe pipe) | |
118 | { | |
119 | struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base); | |
120 | struct intel_panel *panel = &connector->panel; | |
121 | ||
122 | intel_dp_aux_enable_backlight(connector); | |
123 | ||
124 | if (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT) | |
125 | panel->backlight.max = 0xFFFF; | |
126 | else | |
127 | panel->backlight.max = 0xFF; | |
128 | ||
129 | panel->backlight.min = 0; | |
130 | panel->backlight.level = intel_dp_aux_get_backlight(connector); | |
131 | ||
132 | panel->backlight.enabled = panel->backlight.level != 0; | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | static bool | |
138 | intel_dp_aux_display_control_capable(struct intel_connector *connector) | |
139 | { | |
140 | struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base); | |
141 | ||
142 | /* Check the eDP Display control capabilities registers to determine if | |
143 | * the panel can support backlight control over the aux channel | |
144 | */ | |
145 | if (intel_dp->edp_dpcd[1] & DP_EDP_TCON_BACKLIGHT_ADJUSTMENT_CAP && | |
146 | (intel_dp->edp_dpcd[1] & DP_EDP_BACKLIGHT_AUX_ENABLE_CAP) && | |
147 | !((intel_dp->edp_dpcd[1] & DP_EDP_BACKLIGHT_PIN_ENABLE_CAP) || | |
148 | (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP))) { | |
149 | DRM_DEBUG_KMS("AUX Backlight Control Supported!\n"); | |
150 | return true; | |
151 | } | |
152 | return false; | |
153 | } | |
154 | ||
155 | int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector) | |
156 | { | |
157 | struct intel_panel *panel = &intel_connector->panel; | |
158 | ||
159 | if (!i915.enable_dpcd_backlight) | |
160 | return -ENODEV; | |
161 | ||
162 | if (!intel_dp_aux_display_control_capable(intel_connector)) | |
163 | return -ENODEV; | |
164 | ||
165 | panel->backlight.setup = intel_dp_aux_setup_backlight; | |
166 | panel->backlight.enable = intel_dp_aux_enable_backlight; | |
167 | panel->backlight.disable = intel_dp_aux_disable_backlight; | |
168 | panel->backlight.set = intel_dp_aux_set_backlight; | |
169 | panel->backlight.get = intel_dp_aux_get_backlight; | |
170 | ||
171 | return 0; | |
172 | } |