1/*
2 * Copyright 2011 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#include "mxms.h"
25
26#include <subdev/bios.h>
27#include <subdev/bios/conn.h>
28#include <subdev/bios/dcb.h>
29#include <subdev/bios/mxm.h>
30
31struct context {
32	u32 *outp;
33	struct mxms_odev desc;
34};
35
36static bool
37mxm_match_tmds_partner(struct nvkm_mxm *mxm, u8 *data, void *info)
38{
39	struct context *ctx = info;
40	struct mxms_odev desc;
41
42	mxms_output_device(mxm, data, &desc);
43	if (desc.outp_type == 2 &&
44	    desc.dig_conn == ctx->desc.dig_conn)
45		return false;
46	return true;
47}
48
49static bool
50mxm_match_dcb(struct nvkm_mxm *mxm, u8 *data, void *info)
51{
52	struct nvkm_bios *bios = mxm->subdev.device->bios;
53	struct context *ctx = info;
54	u64 desc = *(u64 *)data;
55
56	mxms_output_device(mxm, data, &ctx->desc);
57
58	/* match dcb encoder type to mxm-ods device type */
59	if ((ctx->outp[0] & 0x0000000f) != ctx->desc.outp_type)
60		return true;
61
62	/* digital output, have some extra stuff to match here, there's a
63	 * table in the vbios that provides a mapping from the mxm digital
64	 * connection enum values to SOR/link
65	 */
66	if ((desc & 0x00000000000000f0) >= 0x20) {
67		/* check against sor index */
68		u8 link = mxm_sor_map(bios, ctx->desc.dig_conn);
69		if ((ctx->outp[0] & 0x0f000000) != (link & 0x0f) << 24)
70			return true;
71
72		/* check dcb entry has a compatible link field */
73		link = (link & 0x30) >> 4;
74		if ((link & ((ctx->outp[1] & 0x00000030) >> 4)) != link)
75			return true;
76	}
77
78	/* mark this descriptor accounted for by setting invalid device type,
79	 * except of course some manufactures don't follow specs properly and
80	 * we need to avoid killing off the TMDS function on DP connectors
81	 * if MXM-SIS is missing an entry for it.
82	 */
83	data[0] &= ~0xf0;
84	if (ctx->desc.outp_type == 6 && ctx->desc.conn_type == 6 &&
85	    mxms_foreach(mxm, 0x01, mxm_match_tmds_partner, ctx)) {
86		data[0] |= 0x20; /* modify descriptor to match TMDS now */
87	} else {
88		data[0] |= 0xf0;
89	}
90
91	return false;
92}
93
94static int
95mxm_dcb_sanitise_entry(struct nvkm_bios *bios, void *data, int idx, u16 pdcb)
96{
97	struct nvkm_mxm *mxm = data;
98	struct context ctx = { .outp = (u32 *)(bios->data + pdcb) };
99	u8 type, i2cidx, link, ver, len;
100	u8 *conn;
101
102	/* look for an output device structure that matches this dcb entry.
103	 * if one isn't found, disable it.
104	 */
105	if (mxms_foreach(mxm, 0x01, mxm_match_dcb, &ctx)) {
106		nvkm_debug(&mxm->subdev, "disable %d: %08x %08x\n",
107			   idx, ctx.outp[0], ctx.outp[1]);
108		ctx.outp[0] |= 0x0000000f;
109		return 0;
110	}
111
112	/* modify the output's ddc/aux port, there's a pointer to a table
113	 * with the mapping from mxm ddc/aux port to dcb i2c_index in the
114	 * vbios mxm table
115	 */
116	i2cidx = mxm_ddc_map(bios, ctx.desc.ddc_port);
117	if ((ctx.outp[0] & 0x0000000f) != DCB_OUTPUT_DP)
118		i2cidx = (i2cidx & 0x0f) << 4;
119	else
120		i2cidx = (i2cidx & 0xf0);
121
122	if (i2cidx != 0xf0) {
123		ctx.outp[0] &= ~0x000000f0;
124		ctx.outp[0] |= i2cidx;
125	}
126
127	/* override dcb sorconf.link, based on what mxm data says */
128	switch (ctx.desc.outp_type) {
129	case 0x00: /* Analog CRT */
130	case 0x01: /* Analog TV/HDTV */
131		break;
132	default:
133		link = mxm_sor_map(bios, ctx.desc.dig_conn) & 0x30;
134		ctx.outp[1] &= ~0x00000030;
135		ctx.outp[1] |= link;
136		break;
137	}
138
139	/* we may need to fixup various other vbios tables based on what
140	 * the descriptor says the connector type should be.
141	 *
142	 * in a lot of cases, the vbios tables will claim DVI-I is possible,
143	 * and the mxm data says the connector is really HDMI.  another
144	 * common example is DP->eDP.
145	 */
146	conn  = bios->data;
147	conn += nvbios_connEe(bios, (ctx.outp[0] & 0x0000f000) >> 12, &ver, &len);
148	type  = conn[0];
149	switch (ctx.desc.conn_type) {
150	case 0x01: /* LVDS */
151		ctx.outp[1] |= 0x00000004; /* use_power_scripts */
152		/* XXX: modify default link width in LVDS table */
153		break;
154	case 0x02: /* HDMI */
155		type = DCB_CONNECTOR_HDMI_1;
156		break;
157	case 0x03: /* DVI-D */
158		type = DCB_CONNECTOR_DVI_D;
159		break;
160	case 0x0e: /* eDP, falls through to DPint */
161		ctx.outp[1] |= 0x00010000;
162		fallthrough;
163	case 0x07: /* DP internal, wtf is this?? HP8670w */
164		ctx.outp[1] |= 0x00000004; /* use_power_scripts? */
165		type = DCB_CONNECTOR_eDP;
166		break;
167	default:
168		break;
169	}
170
171	if (mxms_version(mxm) >= 0x0300)
172		conn[0] = type;
173
174	return 0;
175}
176
177static bool
178mxm_show_unmatched(struct nvkm_mxm *mxm, u8 *data, void *info)
179{
180	struct nvkm_subdev *subdev = &mxm->subdev;
181	u64 desc = *(u64 *)data;
182	if ((desc & 0xf0) != 0xf0)
183		nvkm_info(subdev, "unmatched output device %016llx\n", desc);
184	return true;
185}
186
187static void
188mxm_dcb_sanitise(struct nvkm_mxm *mxm)
189{
190	struct nvkm_subdev *subdev = &mxm->subdev;
191	struct nvkm_bios *bios = subdev->device->bios;
192	u8  ver, hdr, cnt, len;
193	u16 dcb = dcb_table(bios, &ver, &hdr, &cnt, &len);
194	if (dcb == 0x0000 || (ver != 0x40 && ver != 0x41)) {
195		nvkm_warn(subdev, "unsupported DCB version\n");
196		return;
197	}
198
199	dcb_outp_foreach(bios, mxm, mxm_dcb_sanitise_entry);
200	mxms_foreach(mxm, 0x01, mxm_show_unmatched, NULL);
201}
202
203int
204nv50_mxm_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
205	     struct nvkm_subdev **pmxm)
206{
207	struct nvkm_mxm *mxm;
208	int ret;
209
210	ret = nvkm_mxm_new_(device, type, inst, &mxm);
211	if (mxm)
212		*pmxm = &mxm->subdev;
213	if (ret)
214		return ret;
215
216	if (mxm->action & MXM_SANITISE_DCB)
217		mxm_dcb_sanitise(mxm);
218
219	return 0;
220}
221