1 /* 2 * Copyright 2009 Red Hat Inc. 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 shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: Ben Skeggs 23 */ 24 25 #include <drm/drmP.h> 26 #include <drm/drm_dp_helper.h> 27 28 #include "nouveau_drv.h" 29 #include "nouveau_connector.h" 30 #include "nouveau_encoder.h" 31 #include "nouveau_crtc.h" 32 33 #include <nvif/class.h> 34 #include <nvif/cl5070.h> 35 36 MODULE_PARM_DESC(mst, "Enable DisplayPort multi-stream (default: enabled)"); 37 static int nouveau_mst = 1; 38 module_param_named(mst, nouveau_mst, int, 0400); 39 40 static void 41 nouveau_dp_probe_oui(struct drm_device *dev, struct nvkm_i2c_aux *aux, u8 *dpcd) 42 { 43 struct nouveau_drm *drm = nouveau_drm(dev); 44 u8 buf[3]; 45 46 if (!(dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT)) 47 return; 48 49 if (!nvkm_rdaux(aux, DP_SINK_OUI, buf, 3)) 50 NV_DEBUG(drm, "Sink OUI: %02hx%02hx%02hx\n", 51 buf[0], buf[1], buf[2]); 52 53 if (!nvkm_rdaux(aux, DP_BRANCH_OUI, buf, 3)) 54 NV_DEBUG(drm, "Branch OUI: %02hx%02hx%02hx\n", 55 buf[0], buf[1], buf[2]); 56 57 } 58 59 int 60 nouveau_dp_detect(struct nouveau_encoder *nv_encoder) 61 { 62 struct drm_device *dev = nv_encoder->base.base.dev; 63 struct nouveau_drm *drm = nouveau_drm(dev); 64 struct nvkm_i2c_aux *aux; 65 u8 dpcd[8]; 66 int ret; 67 68 aux = nv_encoder->aux; 69 if (!aux) 70 return -ENODEV; 71 72 ret = nvkm_rdaux(aux, DP_DPCD_REV, dpcd, sizeof(dpcd)); 73 if (ret) 74 return ret; 75 76 nv_encoder->dp.link_bw = 27000 * dpcd[1]; 77 nv_encoder->dp.link_nr = dpcd[2] & DP_MAX_LANE_COUNT_MASK; 78 79 NV_DEBUG(drm, "display: %dx%d dpcd 0x%02x\n", 80 nv_encoder->dp.link_nr, nv_encoder->dp.link_bw, dpcd[0]); 81 NV_DEBUG(drm, "encoder: %dx%d\n", 82 nv_encoder->dcb->dpconf.link_nr, 83 nv_encoder->dcb->dpconf.link_bw); 84 85 if (nv_encoder->dcb->dpconf.link_nr < nv_encoder->dp.link_nr) 86 nv_encoder->dp.link_nr = nv_encoder->dcb->dpconf.link_nr; 87 if (nv_encoder->dcb->dpconf.link_bw < nv_encoder->dp.link_bw) 88 nv_encoder->dp.link_bw = nv_encoder->dcb->dpconf.link_bw; 89 90 NV_DEBUG(drm, "maximum: %dx%d\n", 91 nv_encoder->dp.link_nr, nv_encoder->dp.link_bw); 92 93 nouveau_dp_probe_oui(dev, aux, dpcd); 94 95 ret = nv50_mstm_detect(nv_encoder->dp.mstm, dpcd, nouveau_mst); 96 if (ret == 1) 97 return NOUVEAU_DP_MST; 98 if (ret == 0) 99 return NOUVEAU_DP_SST; 100 return ret; 101 } 102