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/drm_dp_helper.h> 26 27 #include "nouveau_drv.h" 28 #include "nouveau_connector.h" 29 #include "nouveau_encoder.h" 30 #include "nouveau_crtc.h" 31 32 #include <nvif/class.h> 33 #include <nvif/cl5070.h> 34 35 MODULE_PARM_DESC(mst, "Enable DisplayPort multi-stream (default: enabled)"); 36 static int nouveau_mst = 1; 37 module_param_named(mst, nouveau_mst, int, 0400); 38 39 static void 40 nouveau_dp_probe_oui(struct drm_device *dev, struct nvkm_i2c_aux *aux, u8 *dpcd) 41 { 42 struct nouveau_drm *drm = nouveau_drm(dev); 43 u8 buf[3]; 44 45 if (!(dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT)) 46 return; 47 48 if (!nvkm_rdaux(aux, DP_SINK_OUI, buf, 3)) 49 NV_DEBUG(drm, "Sink OUI: %02hx%02hx%02hx\n", 50 buf[0], buf[1], buf[2]); 51 52 if (!nvkm_rdaux(aux, DP_BRANCH_OUI, buf, 3)) 53 NV_DEBUG(drm, "Branch OUI: %02hx%02hx%02hx\n", 54 buf[0], buf[1], buf[2]); 55 56 } 57 58 int 59 nouveau_dp_detect(struct nouveau_encoder *nv_encoder) 60 { 61 struct drm_device *dev = nv_encoder->base.base.dev; 62 struct nouveau_drm *drm = nouveau_drm(dev); 63 struct nvkm_i2c_aux *aux; 64 u8 dpcd[8]; 65 int ret; 66 67 aux = nv_encoder->aux; 68 if (!aux) 69 return -ENODEV; 70 71 ret = nvkm_rdaux(aux, DP_DPCD_REV, dpcd, sizeof(dpcd)); 72 if (ret) 73 return ret; 74 75 nv_encoder->dp.link_bw = 27000 * dpcd[1]; 76 nv_encoder->dp.link_nr = dpcd[2] & DP_MAX_LANE_COUNT_MASK; 77 78 NV_DEBUG(drm, "display: %dx%d dpcd 0x%02x\n", 79 nv_encoder->dp.link_nr, nv_encoder->dp.link_bw, dpcd[0]); 80 NV_DEBUG(drm, "encoder: %dx%d\n", 81 nv_encoder->dcb->dpconf.link_nr, 82 nv_encoder->dcb->dpconf.link_bw); 83 84 if (nv_encoder->dcb->dpconf.link_nr < nv_encoder->dp.link_nr) 85 nv_encoder->dp.link_nr = nv_encoder->dcb->dpconf.link_nr; 86 if (nv_encoder->dcb->dpconf.link_bw < nv_encoder->dp.link_bw) 87 nv_encoder->dp.link_bw = nv_encoder->dcb->dpconf.link_bw; 88 89 NV_DEBUG(drm, "maximum: %dx%d\n", 90 nv_encoder->dp.link_nr, nv_encoder->dp.link_bw); 91 92 nouveau_dp_probe_oui(dev, aux, dpcd); 93 94 ret = nv50_mstm_detect(nv_encoder->dp.mstm, dpcd, nouveau_mst); 95 if (ret == 1) 96 return NOUVEAU_DP_MST; 97 if (ret == 0) 98 return NOUVEAU_DP_SST; 99 return ret; 100 } 101 102 /* TODO: 103 * - Use the minimum possible BPC here, once we add support for the max bpc 104 * property. 105 * - Validate the mode against downstream port caps (see 106 * drm_dp_downstream_max_clock()) 107 * - Validate against the DP caps advertised by the GPU (we don't check these 108 * yet) 109 */ 110 enum drm_mode_status 111 nv50_dp_mode_valid(struct drm_connector *connector, 112 struct nouveau_encoder *outp, 113 const struct drm_display_mode *mode, 114 unsigned *out_clock) 115 { 116 const unsigned min_clock = 25000; 117 unsigned max_clock, clock; 118 enum drm_mode_status ret; 119 120 if (mode->flags & DRM_MODE_FLAG_INTERLACE && !outp->caps.dp_interlace) 121 return MODE_NO_INTERLACE; 122 123 max_clock = outp->dp.link_nr * outp->dp.link_bw; 124 clock = mode->clock * (connector->display_info.bpc * 3) / 10; 125 126 ret = nouveau_conn_mode_clock_valid(mode, min_clock, max_clock, 127 &clock); 128 if (out_clock) 129 *out_clock = clock; 130 return ret; 131 } 132