LXR linux/drivers/gpu/drm/nouveau/nouveau

   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
  36MODULE_PARM_DESC(mst, "Enable DisplayPort multi-stream (default: enabled)");
  37static int nouveau_mst = 1;
  38module_param_named(mst, nouveau_mst, int, 0400);
  39
  40static void
  41nouveau_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
  59int
  60nouveau_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