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
33static void
34nouveau_dp_probe_oui(struct drm_device *dev, struct nouveau_i2c_port *auxch,
35		     u8 *dpcd)
36{
37	struct nouveau_drm *drm = nouveau_drm(dev);
38	u8 buf[3];
39
40	if (!(dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
41		return;
42
43	if (!nv_rdaux(auxch, DP_SINK_OUI, buf, 3))
44		NV_DEBUG(drm, "Sink OUI: %02hx%02hx%02hx\n",
45			     buf[0], buf[1], buf[2]);
46
47	if (!nv_rdaux(auxch, DP_BRANCH_OUI, buf, 3))
48		NV_DEBUG(drm, "Branch OUI: %02hx%02hx%02hx\n",
49			     buf[0], buf[1], buf[2]);
50
51}
52
53int
54nouveau_dp_detect(struct nouveau_encoder *nv_encoder)
55{
56	struct drm_device *dev = nv_encoder->base.base.dev;
57	struct nouveau_drm *drm = nouveau_drm(dev);
58	struct nouveau_i2c_port *auxch;
59	u8 *dpcd = nv_encoder->dp.dpcd;
60	int ret;
61
62	auxch = nv_encoder->i2c;
63	if (!auxch)
64		return -ENODEV;
65
66	ret = nv_rdaux(auxch, DP_DPCD_REV, dpcd, 8);
67	if (ret)
68		return ret;
69
70	nv_encoder->dp.link_bw = 27000 * dpcd[1];
71	nv_encoder->dp.link_nr = dpcd[2] & DP_MAX_LANE_COUNT_MASK;
72
73	NV_DEBUG(drm, "display: %dx%d dpcd 0x%02x\n",
74		     nv_encoder->dp.link_nr, nv_encoder->dp.link_bw, dpcd[0]);
75	NV_DEBUG(drm, "encoder: %dx%d\n",
76		     nv_encoder->dcb->dpconf.link_nr,
77		     nv_encoder->dcb->dpconf.link_bw);
78
79	if (nv_encoder->dcb->dpconf.link_nr < nv_encoder->dp.link_nr)
80		nv_encoder->dp.link_nr = nv_encoder->dcb->dpconf.link_nr;
81	if (nv_encoder->dcb->dpconf.link_bw < nv_encoder->dp.link_bw)
82		nv_encoder->dp.link_bw = nv_encoder->dcb->dpconf.link_bw;
83
84	NV_DEBUG(drm, "maximum: %dx%d\n",
85		     nv_encoder->dp.link_nr, nv_encoder->dp.link_bw);
86
87	nouveau_dp_probe_oui(dev, auxch, dpcd);
88	return 0;
89}
90