1 /* $NetBSD: nouveau_dp.c,v 1.2 2016/01/29 22:25:45 riastradh Exp $ */ 2 3 /* 4 * Copyright 2009 Red Hat Inc. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 22 * OTHER DEALINGS IN THE SOFTWARE. 23 * 24 * Authors: Ben Skeggs 25 */ 26 27 #include <sys/cdefs.h> 28 __KERNEL_RCSID(0, "$NetBSD: nouveau_dp.c,v 1.2 2016/01/29 22:25:45 riastradh Exp $"); 29 30 #include <drm/drmP.h> 31 #include <drm/drm_dp_helper.h> 32 33 #include "nouveau_drm.h" 34 #include "nouveau_connector.h" 35 #include "nouveau_encoder.h" 36 #include "nouveau_crtc.h" 37 38 #include <core/class.h> 39 40 #include <subdev/gpio.h> 41 #include <subdev/i2c.h> 42 43 static void 44 nouveau_dp_probe_oui(struct drm_device *dev, struct nouveau_i2c_port *auxch, 45 u8 *dpcd) 46 { 47 struct nouveau_drm *drm = nouveau_drm(dev); 48 u8 buf[3]; 49 50 if (!(dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT)) 51 return; 52 53 if (!nv_rdaux(auxch, DP_SINK_OUI, buf, 3)) 54 NV_DEBUG(drm, "Sink OUI: %02"PRIx8"%02"PRIx8"%02"PRIx8"\n", 55 buf[0], buf[1], buf[2]); 56 57 if (!nv_rdaux(auxch, DP_BRANCH_OUI, buf, 3)) 58 NV_DEBUG(drm, "Branch OUI: %02"PRIx8"%02"PRIx8"%02"PRIx8"\n", 59 buf[0], buf[1], buf[2]); 60 61 } 62 63 bool 64 nouveau_dp_detect(struct drm_encoder *encoder) 65 { 66 struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder); 67 struct drm_device *dev = encoder->dev; 68 struct nouveau_drm *drm = nouveau_drm(dev); 69 struct nouveau_i2c_port *auxch; 70 u8 *dpcd = nv_encoder->dp.dpcd; 71 int ret; 72 73 auxch = nv_encoder->i2c; 74 if (!auxch) 75 return false; 76 77 ret = nv_rdaux(auxch, DP_DPCD_REV, dpcd, 8); 78 if (ret) 79 return false; 80 81 nv_encoder->dp.link_bw = 27000 * dpcd[1]; 82 nv_encoder->dp.link_nr = dpcd[2] & DP_MAX_LANE_COUNT_MASK; 83 84 NV_DEBUG(drm, "display: %dx%d dpcd 0x%02x\n", 85 nv_encoder->dp.link_nr, nv_encoder->dp.link_bw, dpcd[0]); 86 NV_DEBUG(drm, "encoder: %dx%d\n", 87 nv_encoder->dcb->dpconf.link_nr, 88 nv_encoder->dcb->dpconf.link_bw); 89 90 if (nv_encoder->dcb->dpconf.link_nr < nv_encoder->dp.link_nr) 91 nv_encoder->dp.link_nr = nv_encoder->dcb->dpconf.link_nr; 92 if (nv_encoder->dcb->dpconf.link_bw < nv_encoder->dp.link_bw) 93 nv_encoder->dp.link_bw = nv_encoder->dcb->dpconf.link_bw; 94 95 NV_DEBUG(drm, "maximum: %dx%d\n", 96 nv_encoder->dp.link_nr, nv_encoder->dp.link_bw); 97 98 nouveau_dp_probe_oui(dev, auxch, dpcd); 99 100 return true; 101 } 102