| 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 | } |