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 * 24 */ 25 #include <drm/drm_edid.h> 26 #include <drm/drm_atomic_helper.h> 27 #include <drm/drm_dp_dual_mode_helper.h> 28 #include "intel_drv.h" 29 30 static enum drm_lspcon_mode lspcon_get_current_mode(struct intel_lspcon *lspcon) 31 { 32 enum drm_lspcon_mode current_mode = DRM_LSPCON_MODE_INVALID; 33 struct i2c_adapter *adapter = &lspcon->aux->ddc; 34 35 if (drm_lspcon_get_mode(adapter, ¤t_mode)) 36 DRM_ERROR("Error reading LSPCON mode\n"); 37 else 38 DRM_DEBUG_KMS("Current LSPCON mode %s\n", 39 current_mode == DRM_LSPCON_MODE_PCON ? "PCON" : "LS"); 40 return current_mode; 41 } 42 43 static int lspcon_change_mode(struct intel_lspcon *lspcon, 44 enum drm_lspcon_mode mode, bool force) 45 { 46 int err; 47 enum drm_lspcon_mode current_mode; 48 struct i2c_adapter *adapter = &lspcon->aux->ddc; 49 50 err = drm_lspcon_get_mode(adapter, ¤t_mode); 51 if (err) { 52 DRM_ERROR("Error reading LSPCON mode\n"); 53 return err; 54 } 55 56 if (current_mode == mode) { 57 DRM_DEBUG_KMS("Current mode = desired LSPCON mode\n"); 58 return 0; 59 } 60 61 err = drm_lspcon_set_mode(adapter, mode); 62 if (err < 0) { 63 DRM_ERROR("LSPCON mode change failed\n"); 64 return err; 65 } 66 67 lspcon->mode = mode; 68 DRM_DEBUG_KMS("LSPCON mode changed done\n"); 69 return 0; 70 } 71 72 static bool lspcon_probe(struct intel_lspcon *lspcon) 73 { 74 enum drm_dp_dual_mode_type adaptor_type; 75 struct i2c_adapter *adapter = &lspcon->aux->ddc; 76 77 /* Lets probe the adaptor and check its type */ 78 adaptor_type = drm_dp_dual_mode_detect(adapter); 79 if (adaptor_type != DRM_DP_DUAL_MODE_LSPCON) { 80 DRM_DEBUG_KMS("No LSPCON detected, found %s\n", 81 drm_dp_get_dual_mode_type_name(adaptor_type)); 82 return false; 83 } 84 85 /* Yay ... got a LSPCON device */ 86 DRM_DEBUG_KMS("LSPCON detected\n"); 87 lspcon->mode = lspcon_get_current_mode(lspcon); 88 lspcon->active = true; 89 return true; 90 } 91 92 void lspcon_resume(struct intel_lspcon *lspcon) 93 { 94 if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON, true)) 95 DRM_ERROR("LSPCON resume failed\n"); 96 else 97 DRM_DEBUG_KMS("LSPCON resume success\n"); 98 } 99 100 bool lspcon_init(struct intel_digital_port *intel_dig_port) 101 { 102 struct intel_dp *dp = &intel_dig_port->dp; 103 struct intel_lspcon *lspcon = &intel_dig_port->lspcon; 104 struct drm_device *dev = intel_dig_port->base.base.dev; 105 struct drm_i915_private *dev_priv = to_i915(dev); 106 107 if (!IS_GEN9(dev_priv)) { 108 DRM_ERROR("LSPCON is supported on GEN9 only\n"); 109 return false; 110 } 111 112 lspcon->active = false; 113 lspcon->mode = DRM_LSPCON_MODE_INVALID; 114 lspcon->aux = &dp->aux; 115 116 if (!lspcon_probe(lspcon)) { 117 DRM_ERROR("Failed to probe lspcon\n"); 118 return false; 119 } 120 121 /* 122 * In the SW state machine, lets Put LSPCON in PCON mode only. 123 * In this way, it will work with both HDMI 1.4 sinks as well as HDMI 124 * 2.0 sinks. 125 */ 126 if (lspcon->active && lspcon->mode != DRM_LSPCON_MODE_PCON) { 127 if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON, 128 true) < 0) { 129 DRM_ERROR("LSPCON mode change to PCON failed\n"); 130 return false; 131 } 132 } 133 134 DRM_DEBUG_KMS("Success: LSPCON init\n"); 135 return true; 136 } 137