Yetunde Adebisi | e7156c8 | 2016-04-05 15:10:52 +0100 | [diff] [blame] | 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 | } |