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
43static void
44nouveau_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
63bool
64nouveau_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