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_drm.h" 29 #include "nouveau_connector.h" 30 #include "nouveau_encoder.h" 31 #include "nouveau_crtc.h" 32 33 static void 34 nouveau_dp_probe_oui(struct drm_device *dev, struct nvkm_i2c_aux *aux, u8 *dpcd) 35 { 36 struct nouveau_drm *drm = nouveau_drm(dev); 37 u8 buf[3]; 38 39 if (!(dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT)) 40 return; 41 42 if (!nvkm_rdaux(aux, DP_SINK_OUI, buf, 3)) 43 NV_DEBUG(drm, "Sink OUI: %02hx%02hx%02hx\n", 44 buf[0], buf[1], buf[2]); 45 46 if (!nvkm_rdaux(aux, DP_BRANCH_OUI, buf, 3)) 47 NV_DEBUG(drm, "Branch OUI: %02hx%02hx%02hx\n", 48 buf[0], buf[1], buf[2]); 49 50 } 51 52 int 53 nouveau_dp_detect(struct nouveau_encoder *nv_encoder) 54 { 55 struct drm_device *dev = nv_encoder->base.base.dev; 56 struct nouveau_drm *drm = nouveau_drm(dev); 57 struct nvkm_i2c_aux *aux; 58 u8 *dpcd = nv_encoder->dp.dpcd; 59 int ret; 60 61 aux = nv_encoder->aux; 62 if (!aux) 63 return -ENODEV; 64 65 ret = nvkm_rdaux(aux, DP_DPCD_REV, dpcd, 8); 66 if (ret) 67 return ret; 68 69 nv_encoder->dp.link_bw = 27000 * dpcd[1]; 70 nv_encoder->dp.link_nr = dpcd[2] & DP_MAX_LANE_COUNT_MASK; 71 72 NV_DEBUG(drm, "display: %dx%d dpcd 0x%02x\n", 73 nv_encoder->dp.link_nr, nv_encoder->dp.link_bw, dpcd[0]); 74 NV_DEBUG(drm, "encoder: %dx%d\n", 75 nv_encoder->dcb->dpconf.link_nr, 76 nv_encoder->dcb->dpconf.link_bw); 77 78 if (nv_encoder->dcb->dpconf.link_nr < nv_encoder->dp.link_nr) 79 nv_encoder->dp.link_nr = nv_encoder->dcb->dpconf.link_nr; 80 if (nv_encoder->dcb->dpconf.link_bw < nv_encoder->dp.link_bw) 81 nv_encoder->dp.link_bw = nv_encoder->dcb->dpconf.link_bw; 82 83 NV_DEBUG(drm, "maximum: %dx%d\n", 84 nv_encoder->dp.link_nr, nv_encoder->dp.link_bw); 85 86 nouveau_dp_probe_oui(dev, aux, dpcd); 87 return 0; 88 } 89