1 /*
2 * Copyright 2014 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 "outp.h"
25 #include "dp.h"
26 #include "ior.h"
27
28 #include <subdev/bios.h>
29 #include <subdev/bios/dcb.h>
30 #include <subdev/i2c.h>
31
32 void
nvkm_outp_route(struct nvkm_disp * disp)33 nvkm_outp_route(struct nvkm_disp *disp)
34 {
35 struct nvkm_outp *outp;
36 struct nvkm_ior *ior;
37
38 list_for_each_entry(ior, &disp->iors, head) {
39 if ((outp = ior->arm.outp) && ior->arm.outp != ior->asy.outp) {
40 OUTP_DBG(outp, "release %s", ior->name);
41 if (ior->func->route.set)
42 ior->func->route.set(outp, NULL);
43 ior->arm.outp = NULL;
44 }
45 }
46
47 list_for_each_entry(ior, &disp->iors, head) {
48 if ((outp = ior->asy.outp)) {
49 OUTP_DBG(outp, "acquire %s", ior->name);
50 if (ior->asy.outp != ior->arm.outp) {
51 if (ior->func->route.set)
52 ior->func->route.set(outp, ior);
53 ior->arm.outp = ior->asy.outp;
54 }
55 }
56 }
57 }
58
59 static enum nvkm_ior_proto
nvkm_outp_xlat(struct nvkm_outp * outp,enum nvkm_ior_type * type)60 nvkm_outp_xlat(struct nvkm_outp *outp, enum nvkm_ior_type *type)
61 {
62 switch (outp->info.location) {
63 case 0:
64 switch (outp->info.type) {
65 case DCB_OUTPUT_ANALOG: *type = DAC; return CRT;
66 case DCB_OUTPUT_TV : *type = DAC; return TV;
67 case DCB_OUTPUT_TMDS : *type = SOR; return TMDS;
68 case DCB_OUTPUT_LVDS : *type = SOR; return LVDS;
69 case DCB_OUTPUT_DP : *type = SOR; return DP;
70 default:
71 break;
72 }
73 break;
74 case 1:
75 switch (outp->info.type) {
76 case DCB_OUTPUT_TMDS: *type = PIOR; return TMDS;
77 case DCB_OUTPUT_DP : *type = PIOR; return TMDS; /* not a bug */
78 default:
79 break;
80 }
81 break;
82 default:
83 break;
84 }
85 WARN_ON(1);
86 return UNKNOWN;
87 }
88
89 void
nvkm_outp_release(struct nvkm_outp * outp,u8 user)90 nvkm_outp_release(struct nvkm_outp *outp, u8 user)
91 {
92 struct nvkm_ior *ior = outp->ior;
93 OUTP_TRACE(outp, "release %02x &= %02x %p", outp->acquired, ~user, ior);
94 if (ior) {
95 outp->acquired &= ~user;
96 if (!outp->acquired) {
97 if (outp->func->release && outp->ior)
98 outp->func->release(outp);
99 outp->ior->asy.outp = NULL;
100 outp->ior = NULL;
101 }
102 }
103 }
104
105 static inline int
nvkm_outp_acquire_ior(struct nvkm_outp * outp,u8 user,struct nvkm_ior * ior)106 nvkm_outp_acquire_ior(struct nvkm_outp *outp, u8 user, struct nvkm_ior *ior)
107 {
108 outp->ior = ior;
109 outp->ior->asy.outp = outp;
110 outp->ior->asy.link = outp->info.sorconf.link;
111 outp->acquired |= user;
112 return 0;
113 }
114
115 static inline int
nvkm_outp_acquire_hda(struct nvkm_outp * outp,enum nvkm_ior_type type,u8 user,bool hda)116 nvkm_outp_acquire_hda(struct nvkm_outp *outp, enum nvkm_ior_type type,
117 u8 user, bool hda)
118 {
119 struct nvkm_ior *ior;
120
121 /* Failing that, a completely unused OR is the next best thing. */
122 list_for_each_entry(ior, &outp->disp->iors, head) {
123 if (!ior->identity && ior->hda == hda &&
124 !ior->asy.outp && ior->type == type && !ior->arm.outp &&
125 (ior->func->route.set || ior->id == __ffs(outp->info.or)))
126 return nvkm_outp_acquire_ior(outp, user, ior);
127 }
128
129 /* Last resort is to assign an OR that's already active on HW,
130 * but will be released during the next modeset.
131 */
132 list_for_each_entry(ior, &outp->disp->iors, head) {
133 if (!ior->identity && ior->hda == hda &&
134 !ior->asy.outp && ior->type == type &&
135 (ior->func->route.set || ior->id == __ffs(outp->info.or)))
136 return nvkm_outp_acquire_ior(outp, user, ior);
137 }
138
139 return -ENOSPC;
140 }
141
142 int
nvkm_outp_acquire(struct nvkm_outp * outp,u8 user,bool hda)143 nvkm_outp_acquire(struct nvkm_outp *outp, u8 user, bool hda)
144 {
145 struct nvkm_ior *ior = outp->ior;
146 enum nvkm_ior_proto proto;
147 enum nvkm_ior_type type;
148
149 OUTP_TRACE(outp, "acquire %02x |= %02x %p", outp->acquired, user, ior);
150 if (ior) {
151 outp->acquired |= user;
152 return 0;
153 }
154
155 /* Lookup a compatible, and unused, OR to assign to the device. */
156 proto = nvkm_outp_xlat(outp, &type);
157 if (proto == UNKNOWN)
158 return -ENOSYS;
159
160 /* Deal with panels requiring identity-mapped SOR assignment. */
161 if (outp->identity) {
162 ior = nvkm_ior_find(outp->disp, SOR, ffs(outp->info.or) - 1);
163 if (WARN_ON(!ior))
164 return -ENOSPC;
165 return nvkm_outp_acquire_ior(outp, user, ior);
166 }
167
168 /* First preference is to reuse the OR that is currently armed
169 * on HW, if any, in order to prevent unnecessary switching.
170 */
171 list_for_each_entry(ior, &outp->disp->iors, head) {
172 if (!ior->identity && !ior->asy.outp && ior->arm.outp == outp) {
173 /*XXX: For various complicated reasons, we can't outright switch
174 * the boot-time OR on the first modeset without some fairly
175 * invasive changes.
176 *
177 * The systems that were fixed by modifying the OR selection
178 * code to account for HDA support shouldn't regress here as
179 * the HDA-enabled ORs match the relevant output's pad macro
180 * index, and the firmware seems to select an OR this way.
181 *
182 * This warning is to make it obvious if that proves wrong.
183 */
184 WARN_ON(hda && !ior->hda);
185 return nvkm_outp_acquire_ior(outp, user, ior);
186 }
187 }
188
189 /* If we don't need HDA, first try to acquire an OR that doesn't
190 * support it to leave free the ones that do.
191 */
192 if (!hda) {
193 if (!nvkm_outp_acquire_hda(outp, type, user, false))
194 return 0;
195
196 /* Use a HDA-supporting SOR anyway. */
197 return nvkm_outp_acquire_hda(outp, type, user, true);
198 }
199
200 /* We want HDA, try to acquire an OR that supports it. */
201 if (!nvkm_outp_acquire_hda(outp, type, user, true))
202 return 0;
203
204 /* There weren't any free ORs that support HDA, grab one that
205 * doesn't and at least allow display to work still.
206 */
207 return nvkm_outp_acquire_hda(outp, type, user, false);
208 }
209
210 void
nvkm_outp_fini(struct nvkm_outp * outp)211 nvkm_outp_fini(struct nvkm_outp *outp)
212 {
213 if (outp->func->fini)
214 outp->func->fini(outp);
215 }
216
217 static void
nvkm_outp_init_route(struct nvkm_outp * outp)218 nvkm_outp_init_route(struct nvkm_outp *outp)
219 {
220 struct nvkm_disp *disp = outp->disp;
221 enum nvkm_ior_proto proto;
222 enum nvkm_ior_type type;
223 struct nvkm_ior *ior;
224 int id, link;
225
226 /* Find any OR from the class that is able to support this device. */
227 proto = nvkm_outp_xlat(outp, &type);
228 if (proto == UNKNOWN)
229 return;
230
231 ior = nvkm_ior_find(disp, type, -1);
232 if (!ior) {
233 WARN_ON(1);
234 return;
235 }
236
237 /* Determine the specific OR, if any, this device is attached to. */
238 if (ior->func->route.get) {
239 id = ior->func->route.get(outp, &link);
240 if (id < 0) {
241 OUTP_DBG(outp, "no route");
242 return;
243 }
244 } else {
245 /* Prior to DCB 4.1, this is hardwired like so. */
246 id = ffs(outp->info.or) - 1;
247 link = (ior->type == SOR) ? outp->info.sorconf.link : 0;
248 }
249
250 ior = nvkm_ior_find(disp, type, id);
251 if (!ior) {
252 WARN_ON(1);
253 return;
254 }
255
256 /* Determine if the OR is already configured for this device. */
257 ior->func->state(ior, &ior->arm);
258 if (!ior->arm.head || ior->arm.proto != proto) {
259 OUTP_DBG(outp, "no heads (%x %d %d)", ior->arm.head,
260 ior->arm.proto, proto);
261
262 /* The EFI GOP driver on Ampere can leave unused DP links routed,
263 * which we don't expect. The DisableLT IED script *should* get
264 * us back to where we need to be.
265 */
266 if (ior->func->route.get && !ior->arm.head && outp->info.type == DCB_OUTPUT_DP)
267 nvkm_dp_disable(outp, ior);
268
269 return;
270 }
271
272 OUTP_DBG(outp, "on %s link %x", ior->name, ior->arm.link);
273 ior->arm.outp = outp;
274 }
275
276 void
nvkm_outp_init(struct nvkm_outp * outp)277 nvkm_outp_init(struct nvkm_outp *outp)
278 {
279 nvkm_outp_init_route(outp);
280 if (outp->func->init)
281 outp->func->init(outp);
282 }
283
284 void
nvkm_outp_del(struct nvkm_outp ** poutp)285 nvkm_outp_del(struct nvkm_outp **poutp)
286 {
287 struct nvkm_outp *outp = *poutp;
288 if (outp && !WARN_ON(!outp->func)) {
289 if (outp->func->dtor)
290 *poutp = outp->func->dtor(outp);
291 kfree(*poutp);
292 *poutp = NULL;
293 }
294 }
295
296 int
nvkm_outp_new_(const struct nvkm_outp_func * func,struct nvkm_disp * disp,int index,struct dcb_output * dcbE,struct nvkm_outp ** poutp)297 nvkm_outp_new_(const struct nvkm_outp_func *func, struct nvkm_disp *disp,
298 int index, struct dcb_output *dcbE, struct nvkm_outp **poutp)
299 {
300 struct nvkm_i2c *i2c = disp->engine.subdev.device->i2c;
301 struct nvkm_outp *outp;
302 enum nvkm_ior_proto proto;
303 enum nvkm_ior_type type;
304
305 if (!(outp = *poutp = kzalloc(sizeof(*outp), GFP_KERNEL)))
306 return -ENOMEM;
307
308 outp->func = func;
309 outp->disp = disp;
310 outp->index = index;
311 outp->info = *dcbE;
312 outp->i2c = nvkm_i2c_bus_find(i2c, dcbE->i2c_index);
313
314 OUTP_DBG(outp, "type %02x loc %d or %d link %d con %x "
315 "edid %x bus %d head %x",
316 outp->info.type, outp->info.location, outp->info.or,
317 outp->info.type >= 2 ? outp->info.sorconf.link : 0,
318 outp->info.connector, outp->info.i2c_index,
319 outp->info.bus, outp->info.heads);
320
321 /* Cull output paths we can't map to an output resource. */
322 proto = nvkm_outp_xlat(outp, &type);
323 if (proto == UNKNOWN)
324 return -ENODEV;
325
326 return 0;
327 }
328
329 static const struct nvkm_outp_func
330 nvkm_outp = {
331 };
332
333 int
nvkm_outp_new(struct nvkm_disp * disp,int index,struct dcb_output * dcbE,struct nvkm_outp ** poutp)334 nvkm_outp_new(struct nvkm_disp *disp, int index, struct dcb_output *dcbE,
335 struct nvkm_outp **poutp)
336 {
337 return nvkm_outp_new_(&nvkm_outp, disp, index, dcbE, poutp);
338 }
339