1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
4 */
5
6 #include "dp_panel.h"
7
8 #include <drm/drm_connector.h>
9 #include <drm/drm_edid.h>
10 #include <drm/drm_print.h>
11
12 struct dp_panel_private {
13 struct device *dev;
14 struct dp_panel dp_panel;
15 struct drm_dp_aux *aux;
16 struct dp_link *link;
17 struct dp_catalog *catalog;
18 bool panel_on;
19 bool aux_cfg_update_done;
20 };
21
dp_panel_read_dpcd(struct dp_panel * dp_panel)22 static int dp_panel_read_dpcd(struct dp_panel *dp_panel)
23 {
24 int rc = 0;
25 size_t len;
26 ssize_t rlen;
27 struct dp_panel_private *panel;
28 struct dp_link_info *link_info;
29 u8 *dpcd, major = 0, minor = 0, temp;
30 u32 offset = DP_DPCD_REV;
31
32 dpcd = dp_panel->dpcd;
33
34 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
35 link_info = &dp_panel->link_info;
36
37 rlen = drm_dp_dpcd_read(panel->aux, offset,
38 dpcd, (DP_RECEIVER_CAP_SIZE + 1));
39 if (rlen < (DP_RECEIVER_CAP_SIZE + 1)) {
40 DRM_ERROR("dpcd read failed, rlen=%zd\n", rlen);
41 if (rlen == -ETIMEDOUT)
42 rc = rlen;
43 else
44 rc = -EINVAL;
45
46 goto end;
47 }
48
49 temp = dpcd[DP_TRAINING_AUX_RD_INTERVAL];
50
51 /* check for EXTENDED_RECEIVER_CAPABILITY_FIELD_PRESENT */
52 if (temp & BIT(7)) {
53 DRM_DEBUG_DP("using EXTENDED_RECEIVER_CAPABILITY_FIELD\n");
54 offset = DPRX_EXTENDED_DPCD_FIELD;
55 }
56
57 rlen = drm_dp_dpcd_read(panel->aux, offset,
58 dpcd, (DP_RECEIVER_CAP_SIZE + 1));
59 if (rlen < (DP_RECEIVER_CAP_SIZE + 1)) {
60 DRM_ERROR("dpcd read failed, rlen=%zd\n", rlen);
61 if (rlen == -ETIMEDOUT)
62 rc = rlen;
63 else
64 rc = -EINVAL;
65
66 goto end;
67 }
68
69 link_info->revision = dpcd[DP_DPCD_REV];
70 major = (link_info->revision >> 4) & 0x0f;
71 minor = link_info->revision & 0x0f;
72
73 link_info->rate = drm_dp_bw_code_to_link_rate(dpcd[DP_MAX_LINK_RATE]);
74 link_info->num_lanes = dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
75
76 if (link_info->num_lanes > dp_panel->max_dp_lanes)
77 link_info->num_lanes = dp_panel->max_dp_lanes;
78
79 /* Limit support upto HBR2 until HBR3 support is added */
80 if (link_info->rate >= (drm_dp_bw_code_to_link_rate(DP_LINK_BW_5_4)))
81 link_info->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_5_4);
82
83 DRM_DEBUG_DP("version: %d.%d\n", major, minor);
84 DRM_DEBUG_DP("link_rate=%d\n", link_info->rate);
85 DRM_DEBUG_DP("lane_count=%d\n", link_info->num_lanes);
86
87 if (drm_dp_enhanced_frame_cap(dpcd))
88 link_info->capabilities |= DP_LINK_CAP_ENHANCED_FRAMING;
89
90 dp_panel->dfp_present = dpcd[DP_DOWNSTREAMPORT_PRESENT];
91 dp_panel->dfp_present &= DP_DWN_STRM_PORT_PRESENT;
92
93 if (dp_panel->dfp_present && (dpcd[DP_DPCD_REV] > 0x10)) {
94 dp_panel->ds_port_cnt = dpcd[DP_DOWN_STREAM_PORT_COUNT];
95 dp_panel->ds_port_cnt &= DP_PORT_COUNT_MASK;
96 len = DP_DOWNSTREAM_PORTS * DP_DOWNSTREAM_CAP_SIZE;
97
98 rlen = drm_dp_dpcd_read(panel->aux,
99 DP_DOWNSTREAM_PORT_0, dp_panel->ds_cap_info, len);
100 if (rlen < len) {
101 DRM_ERROR("ds port status failed, rlen=%zd\n", rlen);
102 rc = -EINVAL;
103 goto end;
104 }
105 }
106
107 end:
108 return rc;
109 }
110
dp_panel_get_supported_bpp(struct dp_panel * dp_panel,u32 mode_edid_bpp,u32 mode_pclk_khz)111 static u32 dp_panel_get_supported_bpp(struct dp_panel *dp_panel,
112 u32 mode_edid_bpp, u32 mode_pclk_khz)
113 {
114 struct dp_link_info *link_info;
115 const u32 max_supported_bpp = 30, min_supported_bpp = 18;
116 u32 bpp = 0, data_rate_khz = 0;
117
118 bpp = min_t(u32, mode_edid_bpp, max_supported_bpp);
119
120 link_info = &dp_panel->link_info;
121 data_rate_khz = link_info->num_lanes * link_info->rate * 8;
122
123 while (bpp > min_supported_bpp) {
124 if (mode_pclk_khz * bpp <= data_rate_khz)
125 break;
126 bpp -= 6;
127 }
128
129 return bpp;
130 }
131
dp_panel_update_modes(struct drm_connector * connector,struct edid * edid)132 static int dp_panel_update_modes(struct drm_connector *connector,
133 struct edid *edid)
134 {
135 int rc = 0;
136
137 if (edid) {
138 rc = drm_connector_update_edid_property(connector, edid);
139 if (rc) {
140 DRM_ERROR("failed to update edid property %d\n", rc);
141 return rc;
142 }
143 rc = drm_add_edid_modes(connector, edid);
144 DRM_DEBUG_DP("%s -", __func__);
145 return rc;
146 }
147
148 rc = drm_connector_update_edid_property(connector, NULL);
149 if (rc)
150 DRM_ERROR("failed to update edid property %d\n", rc);
151
152 return rc;
153 }
154
dp_panel_read_sink_caps(struct dp_panel * dp_panel,struct drm_connector * connector)155 int dp_panel_read_sink_caps(struct dp_panel *dp_panel,
156 struct drm_connector *connector)
157 {
158 int rc = 0, bw_code;
159 int rlen, count;
160 struct dp_panel_private *panel;
161
162 if (!dp_panel || !connector) {
163 DRM_ERROR("invalid input\n");
164 return -EINVAL;
165 }
166
167 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
168
169 rc = dp_panel_read_dpcd(dp_panel);
170 bw_code = drm_dp_link_rate_to_bw_code(dp_panel->link_info.rate);
171 if (rc || !is_link_rate_valid(bw_code) ||
172 !is_lane_count_valid(dp_panel->link_info.num_lanes) ||
173 (bw_code > dp_panel->max_bw_code)) {
174 DRM_ERROR("read dpcd failed %d\n", rc);
175 return rc;
176 }
177
178 if (dp_panel->dfp_present) {
179 rlen = drm_dp_dpcd_read(panel->aux, DP_SINK_COUNT,
180 &count, 1);
181 if (rlen == 1) {
182 count = DP_GET_SINK_COUNT(count);
183 if (!count) {
184 DRM_ERROR("no downstream ports connected\n");
185 panel->link->sink_count = 0;
186 rc = -ENOTCONN;
187 goto end;
188 }
189 }
190 }
191
192 kfree(dp_panel->edid);
193 dp_panel->edid = NULL;
194
195 dp_panel->edid = drm_get_edid(connector,
196 &panel->aux->ddc);
197 if (!dp_panel->edid) {
198 DRM_ERROR("panel edid read failed\n");
199 /* check edid read fail is due to unplug */
200 if (!dp_catalog_link_is_connected(panel->catalog)) {
201 rc = -ETIMEDOUT;
202 goto end;
203 }
204
205 /* fail safe edid */
206 mutex_lock(&connector->dev->mode_config.mutex);
207 if (drm_add_modes_noedid(connector, 640, 480))
208 drm_set_preferred_mode(connector, 640, 480);
209 mutex_unlock(&connector->dev->mode_config.mutex);
210 }
211
212 if (panel->aux_cfg_update_done) {
213 DRM_DEBUG_DP("read DPCD with updated AUX config\n");
214 rc = dp_panel_read_dpcd(dp_panel);
215 bw_code = drm_dp_link_rate_to_bw_code(dp_panel->link_info.rate);
216 if (rc || !is_link_rate_valid(bw_code) ||
217 !is_lane_count_valid(dp_panel->link_info.num_lanes)
218 || (bw_code > dp_panel->max_bw_code)) {
219 DRM_ERROR("read dpcd failed %d\n", rc);
220 return rc;
221 }
222 panel->aux_cfg_update_done = false;
223 }
224 end:
225 return rc;
226 }
227
dp_panel_get_mode_bpp(struct dp_panel * dp_panel,u32 mode_edid_bpp,u32 mode_pclk_khz)228 u32 dp_panel_get_mode_bpp(struct dp_panel *dp_panel,
229 u32 mode_edid_bpp, u32 mode_pclk_khz)
230 {
231 struct dp_panel_private *panel;
232 u32 bpp = mode_edid_bpp;
233
234 if (!dp_panel || !mode_edid_bpp || !mode_pclk_khz) {
235 DRM_ERROR("invalid input\n");
236 return 0;
237 }
238
239 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
240
241 if (dp_panel->video_test)
242 bpp = dp_link_bit_depth_to_bpp(
243 panel->link->test_video.test_bit_depth);
244 else
245 bpp = dp_panel_get_supported_bpp(dp_panel, mode_edid_bpp,
246 mode_pclk_khz);
247
248 return bpp;
249 }
250
dp_panel_get_modes(struct dp_panel * dp_panel,struct drm_connector * connector,struct dp_display_mode * mode)251 int dp_panel_get_modes(struct dp_panel *dp_panel,
252 struct drm_connector *connector, struct dp_display_mode *mode)
253 {
254 if (!dp_panel) {
255 DRM_ERROR("invalid input\n");
256 return -EINVAL;
257 }
258
259 if (dp_panel->edid)
260 return dp_panel_update_modes(connector, dp_panel->edid);
261
262 return 0;
263 }
264
dp_panel_get_edid_checksum(struct edid * edid)265 static u8 dp_panel_get_edid_checksum(struct edid *edid)
266 {
267 struct edid *last_block;
268 u8 *raw_edid;
269 bool is_edid_corrupt = false;
270
271 if (!edid) {
272 DRM_ERROR("invalid edid input\n");
273 return 0;
274 }
275
276 raw_edid = (u8 *)edid;
277 raw_edid += (edid->extensions * EDID_LENGTH);
278 last_block = (struct edid *)raw_edid;
279
280 /* block type extension */
281 drm_edid_block_valid(raw_edid, 1, false, &is_edid_corrupt);
282 if (!is_edid_corrupt)
283 return last_block->checksum;
284
285 DRM_ERROR("Invalid block, no checksum\n");
286 return 0;
287 }
288
dp_panel_handle_sink_request(struct dp_panel * dp_panel)289 void dp_panel_handle_sink_request(struct dp_panel *dp_panel)
290 {
291 struct dp_panel_private *panel;
292
293 if (!dp_panel) {
294 DRM_ERROR("invalid input\n");
295 return;
296 }
297
298 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
299
300 if (panel->link->sink_request & DP_TEST_LINK_EDID_READ) {
301 u8 checksum;
302
303 if (dp_panel->edid)
304 checksum = dp_panel_get_edid_checksum(dp_panel->edid);
305 else
306 checksum = dp_panel->connector->real_edid_checksum;
307
308 dp_link_send_edid_checksum(panel->link, checksum);
309 dp_link_send_test_response(panel->link);
310 }
311 }
312
dp_panel_tpg_config(struct dp_panel * dp_panel,bool enable)313 void dp_panel_tpg_config(struct dp_panel *dp_panel, bool enable)
314 {
315 struct dp_catalog *catalog;
316 struct dp_panel_private *panel;
317
318 if (!dp_panel) {
319 DRM_ERROR("invalid input\n");
320 return;
321 }
322
323 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
324 catalog = panel->catalog;
325
326 if (!panel->panel_on) {
327 DRM_DEBUG_DP("DP panel not enabled, handle TPG on next on\n");
328 return;
329 }
330
331 if (!enable) {
332 dp_catalog_panel_tpg_disable(catalog);
333 return;
334 }
335
336 DRM_DEBUG_DP("%s: calling catalog tpg_enable\n", __func__);
337 dp_catalog_panel_tpg_enable(catalog, &panel->dp_panel.dp_mode.drm_mode);
338 }
339
dp_panel_dump_regs(struct dp_panel * dp_panel)340 void dp_panel_dump_regs(struct dp_panel *dp_panel)
341 {
342 struct dp_catalog *catalog;
343 struct dp_panel_private *panel;
344
345 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
346 catalog = panel->catalog;
347
348 dp_catalog_dump_regs(catalog);
349 }
350
dp_panel_timing_cfg(struct dp_panel * dp_panel)351 int dp_panel_timing_cfg(struct dp_panel *dp_panel)
352 {
353 int rc = 0;
354 u32 data, total_ver, total_hor;
355 struct dp_catalog *catalog;
356 struct dp_panel_private *panel;
357 struct drm_display_mode *drm_mode;
358
359 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
360 catalog = panel->catalog;
361 drm_mode = &panel->dp_panel.dp_mode.drm_mode;
362
363 DRM_DEBUG_DP("width=%d hporch= %d %d %d\n",
364 drm_mode->hdisplay, drm_mode->htotal - drm_mode->hsync_end,
365 drm_mode->hsync_start - drm_mode->hdisplay,
366 drm_mode->hsync_end - drm_mode->hsync_start);
367
368 DRM_DEBUG_DP("height=%d vporch= %d %d %d\n",
369 drm_mode->vdisplay, drm_mode->vtotal - drm_mode->vsync_end,
370 drm_mode->vsync_start - drm_mode->vdisplay,
371 drm_mode->vsync_end - drm_mode->vsync_start);
372
373 total_hor = drm_mode->htotal;
374
375 total_ver = drm_mode->vtotal;
376
377 data = total_ver;
378 data <<= 16;
379 data |= total_hor;
380
381 catalog->total = data;
382
383 data = (drm_mode->vtotal - drm_mode->vsync_start);
384 data <<= 16;
385 data |= (drm_mode->htotal - drm_mode->hsync_start);
386
387 catalog->sync_start = data;
388
389 data = drm_mode->vsync_end - drm_mode->vsync_start;
390 data <<= 16;
391 data |= (panel->dp_panel.dp_mode.v_active_low << 31);
392 data |= drm_mode->hsync_end - drm_mode->hsync_start;
393 data |= (panel->dp_panel.dp_mode.h_active_low << 15);
394
395 catalog->width_blanking = data;
396
397 data = drm_mode->vdisplay;
398 data <<= 16;
399 data |= drm_mode->hdisplay;
400
401 catalog->dp_active = data;
402
403 dp_catalog_panel_timing_cfg(catalog);
404 panel->panel_on = true;
405
406 return rc;
407 }
408
dp_panel_init_panel_info(struct dp_panel * dp_panel)409 int dp_panel_init_panel_info(struct dp_panel *dp_panel)
410 {
411 int rc = 0;
412 struct drm_display_mode *drm_mode;
413
414 drm_mode = &dp_panel->dp_mode.drm_mode;
415
416 /*
417 * print resolution info as this is a result
418 * of user initiated action of cable connection
419 */
420 DRM_DEBUG_DP("SET NEW RESOLUTION:\n");
421 DRM_DEBUG_DP("%dx%d@%dfps\n", drm_mode->hdisplay,
422 drm_mode->vdisplay, drm_mode_vrefresh(drm_mode));
423 DRM_DEBUG_DP("h_porches(back|front|width) = (%d|%d|%d)\n",
424 drm_mode->htotal - drm_mode->hsync_end,
425 drm_mode->hsync_start - drm_mode->hdisplay,
426 drm_mode->hsync_end - drm_mode->hsync_start);
427 DRM_DEBUG_DP("v_porches(back|front|width) = (%d|%d|%d)\n",
428 drm_mode->vtotal - drm_mode->vsync_end,
429 drm_mode->vsync_start - drm_mode->vdisplay,
430 drm_mode->vsync_end - drm_mode->vsync_start);
431 DRM_DEBUG_DP("pixel clock (KHz)=(%d)\n", drm_mode->clock);
432 DRM_DEBUG_DP("bpp = %d\n", dp_panel->dp_mode.bpp);
433
434 dp_panel->dp_mode.bpp = max_t(u32, 18,
435 min_t(u32, dp_panel->dp_mode.bpp, 30));
436 DRM_DEBUG_DP("updated bpp = %d\n", dp_panel->dp_mode.bpp);
437
438 return rc;
439 }
440
dp_panel_get(struct dp_panel_in * in)441 struct dp_panel *dp_panel_get(struct dp_panel_in *in)
442 {
443 struct dp_panel_private *panel;
444 struct dp_panel *dp_panel;
445
446 if (!in->dev || !in->catalog || !in->aux || !in->link) {
447 DRM_ERROR("invalid input\n");
448 return ERR_PTR(-EINVAL);
449 }
450
451 panel = devm_kzalloc(in->dev, sizeof(*panel), GFP_KERNEL);
452 if (!panel)
453 return ERR_PTR(-ENOMEM);
454
455 panel->dev = in->dev;
456 panel->aux = in->aux;
457 panel->catalog = in->catalog;
458 panel->link = in->link;
459
460 dp_panel = &panel->dp_panel;
461 dp_panel->max_bw_code = DP_LINK_BW_8_1;
462 panel->aux_cfg_update_done = false;
463
464 return dp_panel;
465 }
466
dp_panel_put(struct dp_panel * dp_panel)467 void dp_panel_put(struct dp_panel *dp_panel)
468 {
469 if (!dp_panel)
470 return;
471
472 kfree(dp_panel->edid);
473 }
474