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 struct intel_dp *lspcon_to_intel_dp(struct intel_lspcon *lspcon) 31 { 32 struct intel_digital_port *dig_port = 33 container_of(lspcon, struct intel_digital_port, lspcon); 34 35 return &dig_port->dp; 36 } 37 38 static const char *lspcon_mode_name(enum drm_lspcon_mode mode) 39 { 40 switch (mode) { 41 case DRM_LSPCON_MODE_PCON: 42 return "PCON"; 43 case DRM_LSPCON_MODE_LS: 44 return "LS"; 45 case DRM_LSPCON_MODE_INVALID: 46 return "INVALID"; 47 default: 48 MISSING_CASE(mode); 49 return "INVALID"; 50 } 51 } 52 53 static enum drm_lspcon_mode lspcon_get_current_mode(struct intel_lspcon *lspcon) 54 { 55 enum drm_lspcon_mode current_mode; 56 struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc; 57 58 if (drm_lspcon_get_mode(adapter, ¤t_mode)) { 59 DRM_DEBUG_KMS("Error reading LSPCON mode\n"); 60 return DRM_LSPCON_MODE_INVALID; 61 } 62 return current_mode; 63 } 64 65 static enum drm_lspcon_mode lspcon_wait_mode(struct intel_lspcon *lspcon, 66 enum drm_lspcon_mode mode) 67 { 68 enum drm_lspcon_mode current_mode; 69 70 current_mode = lspcon_get_current_mode(lspcon); 71 if (current_mode == mode) 72 goto out; 73 74 DRM_DEBUG_KMS("Waiting for LSPCON mode %s to settle\n", 75 lspcon_mode_name(mode)); 76 77 wait_for((current_mode = lspcon_get_current_mode(lspcon)) == mode, 100); 78 if (current_mode != mode) 79 DRM_ERROR("LSPCON mode hasn't settled\n"); 80 81 out: 82 DRM_DEBUG_KMS("Current LSPCON mode %s\n", 83 lspcon_mode_name(current_mode)); 84 85 return current_mode; 86 } 87 88 static int lspcon_change_mode(struct intel_lspcon *lspcon, 89 enum drm_lspcon_mode mode) 90 { 91 int err; 92 enum drm_lspcon_mode current_mode; 93 struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc; 94 95 err = drm_lspcon_get_mode(adapter, ¤t_mode); 96 if (err) { 97 DRM_ERROR("Error reading LSPCON mode\n"); 98 return err; 99 } 100 101 if (current_mode == mode) { 102 DRM_DEBUG_KMS("Current mode = desired LSPCON mode\n"); 103 return 0; 104 } 105 106 err = drm_lspcon_set_mode(adapter, mode); 107 if (err < 0) { 108 DRM_ERROR("LSPCON mode change failed\n"); 109 return err; 110 } 111 112 lspcon->mode = mode; 113 DRM_DEBUG_KMS("LSPCON mode changed done\n"); 114 return 0; 115 } 116 117 static bool lspcon_wake_native_aux_ch(struct intel_lspcon *lspcon) 118 { 119 uint8_t rev; 120 121 if (drm_dp_dpcd_readb(&lspcon_to_intel_dp(lspcon)->aux, DP_DPCD_REV, 122 &rev) != 1) { 123 DRM_DEBUG_KMS("Native AUX CH down\n"); 124 return false; 125 } 126 127 DRM_DEBUG_KMS("Native AUX CH up, DPCD version: %d.%d\n", 128 rev >> 4, rev & 0xf); 129 130 return true; 131 } 132 133 static bool lspcon_probe(struct intel_lspcon *lspcon) 134 { 135 int retry; 136 enum drm_dp_dual_mode_type adaptor_type; 137 struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc; 138 enum drm_lspcon_mode expected_mode; 139 140 expected_mode = lspcon_wake_native_aux_ch(lspcon) ? 141 DRM_LSPCON_MODE_PCON : DRM_LSPCON_MODE_LS; 142 143 /* Lets probe the adaptor and check its type */ 144 for (retry = 0; retry < 6; retry++) { 145 if (retry) 146 usleep_range(500, 1000); 147 148 adaptor_type = drm_dp_dual_mode_detect(adapter); 149 if (adaptor_type == DRM_DP_DUAL_MODE_LSPCON) 150 break; 151 } 152 153 if (adaptor_type != DRM_DP_DUAL_MODE_LSPCON) { 154 DRM_DEBUG_KMS("No LSPCON detected, found %s\n", 155 drm_dp_get_dual_mode_type_name(adaptor_type)); 156 return false; 157 } 158 159 /* Yay ... got a LSPCON device */ 160 DRM_DEBUG_KMS("LSPCON detected\n"); 161 lspcon->mode = lspcon_wait_mode(lspcon, expected_mode); 162 lspcon->active = true; 163 return true; 164 } 165 166 static void lspcon_resume_in_pcon_wa(struct intel_lspcon *lspcon) 167 { 168 struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon); 169 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp); 170 struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev); 171 unsigned long start = jiffies; 172 173 while (1) { 174 if (intel_digital_port_connected(dev_priv, dig_port)) { 175 DRM_DEBUG_KMS("LSPCON recovering in PCON mode after %lu ms\n", 176 jiffies_to_msecs(jiffies - start)); 177 return; 178 } 179 180 if (time_after(jiffies, start + msecs_to_jiffies(1000))) 181 break; 182 183 usleep_range(10000, 15000); 184 } 185 186 DRM_DEBUG_KMS("LSPCON DP descriptor mismatch after resume\n"); 187 } 188 189 void lspcon_resume(struct intel_lspcon *lspcon) 190 { 191 enum drm_lspcon_mode expected_mode; 192 193 if (lspcon_wake_native_aux_ch(lspcon)) { 194 expected_mode = DRM_LSPCON_MODE_PCON; 195 lspcon_resume_in_pcon_wa(lspcon); 196 } else { 197 expected_mode = DRM_LSPCON_MODE_LS; 198 } 199 200 if (lspcon_wait_mode(lspcon, expected_mode) == DRM_LSPCON_MODE_PCON) 201 return; 202 203 if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON)) 204 DRM_ERROR("LSPCON resume failed\n"); 205 else 206 DRM_DEBUG_KMS("LSPCON resume success\n"); 207 } 208 209 void lspcon_wait_pcon_mode(struct intel_lspcon *lspcon) 210 { 211 lspcon_wait_mode(lspcon, DRM_LSPCON_MODE_PCON); 212 } 213 214 bool lspcon_init(struct intel_digital_port *intel_dig_port) 215 { 216 struct intel_dp *dp = &intel_dig_port->dp; 217 struct intel_lspcon *lspcon = &intel_dig_port->lspcon; 218 struct drm_device *dev = intel_dig_port->base.base.dev; 219 struct drm_i915_private *dev_priv = to_i915(dev); 220 221 if (!HAS_LSPCON(dev_priv)) { 222 DRM_ERROR("LSPCON is not supported on this platform\n"); 223 return false; 224 } 225 226 lspcon->active = false; 227 lspcon->mode = DRM_LSPCON_MODE_INVALID; 228 229 if (!lspcon_probe(lspcon)) { 230 DRM_ERROR("Failed to probe lspcon\n"); 231 return false; 232 } 233 234 /* 235 * In the SW state machine, lets Put LSPCON in PCON mode only. 236 * In this way, it will work with both HDMI 1.4 sinks as well as HDMI 237 * 2.0 sinks. 238 */ 239 if (lspcon->active && lspcon->mode != DRM_LSPCON_MODE_PCON) { 240 if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON) < 0) { 241 DRM_ERROR("LSPCON mode change to PCON failed\n"); 242 return false; 243 } 244 } 245 246 if (!intel_dp_read_dpcd(dp)) { 247 DRM_ERROR("LSPCON DPCD read failed\n"); 248 return false; 249 } 250 251 drm_dp_read_desc(&dp->aux, &dp->desc, drm_dp_is_branch(dp->dpcd)); 252 253 DRM_DEBUG_KMS("Success: LSPCON init\n"); 254 return true; 255 } 256