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/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
  35MODULE_PARM_DESC(mst, "Enable DisplayPort multi-stream (default: enabled)");
  36static int nouveau_mst = 1;
  37module_param_named(mst, nouveau_mst, int, 0400);
  38
  39static void
  40nouveau_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
  58int
  59nouveau_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 */
 110enum drm_mode_status
 111nv50_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