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 | |
43 | static void |
44 | nouveau_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 | |
63 | bool |
64 | nouveau_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 | |