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 drm_device *drm_dev;
15 struct dp_panel dp_panel;
16 struct drm_dp_aux *aux;
17 struct dp_link *link;
18 struct dp_catalog *catalog;
19 bool panel_on;
20 bool aux_cfg_update_done;
21 };
22
dp_panel_read_psr_cap(struct dp_panel_private * panel)23 static void dp_panel_read_psr_cap(struct dp_panel_private *panel)
24 {
25 ssize_t rlen;
26 struct dp_panel *dp_panel;
27
28 dp_panel = &panel->dp_panel;
29
30 /* edp sink */
31 if (dp_panel->dpcd[DP_EDP_CONFIGURATION_CAP]) {
32 rlen = drm_dp_dpcd_read(panel->aux, DP_PSR_SUPPORT,
33 &dp_panel->psr_cap, sizeof(dp_panel->psr_cap));
34 if (rlen == sizeof(dp_panel->psr_cap)) {
35 drm_dbg_dp(panel->drm_dev,
36 "psr version: 0x%x, psr_cap: 0x%x\n",
37 dp_panel->psr_cap.version,
38 dp_panel->psr_cap.capabilities);
39 } else
40 DRM_ERROR("failed to read psr info, rlen=%zd\n", rlen);
41 }
42 }
43
dp_panel_read_dpcd(struct dp_panel * dp_panel)44 static int dp_panel_read_dpcd(struct dp_panel *dp_panel)
45 {
46 int rc = 0;
47 size_t len;
48 ssize_t rlen;
49 struct dp_panel_private *panel;
50 struct dp_link_info *link_info;
51 u8 *dpcd, major = 0, minor = 0, temp;
52 u32 offset = DP_DPCD_REV;
53
54 dpcd = dp_panel->dpcd;
55
56 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
57 link_info = &dp_panel->link_info;
58
59 rlen = drm_dp_dpcd_read(panel->aux, offset,
60 dpcd, (DP_RECEIVER_CAP_SIZE + 1));
61 if (rlen < (DP_RECEIVER_CAP_SIZE + 1)) {
62 DRM_ERROR("dpcd read failed, rlen=%zd\n", rlen);
63 if (rlen == -ETIMEDOUT)
64 rc = rlen;
65 else
66 rc = -EINVAL;
67
68 goto end;
69 }
70
71 temp = dpcd[DP_TRAINING_AUX_RD_INTERVAL];
72
73 /* check for EXTENDED_RECEIVER_CAPABILITY_FIELD_PRESENT */
74 if (temp & BIT(7)) {
75 drm_dbg_dp(panel->drm_dev,
76 "using EXTENDED_RECEIVER_CAPABILITY_FIELD\n");
77 offset = DPRX_EXTENDED_DPCD_FIELD;
78 }
79
80 rlen = drm_dp_dpcd_read(panel->aux, offset,
81 dpcd, (DP_RECEIVER_CAP_SIZE + 1));
82 if (rlen < (DP_RECEIVER_CAP_SIZE + 1)) {
83 DRM_ERROR("dpcd read failed, rlen=%zd\n", rlen);
84 if (rlen == -ETIMEDOUT)
85 rc = rlen;
86 else
87 rc = -EINVAL;
88
89 goto end;
90 }
91
92 link_info->revision = dpcd[DP_DPCD_REV];
93 major = (link_info->revision >> 4) & 0x0f;
94 minor = link_info->revision & 0x0f;
95
96 link_info->rate = drm_dp_bw_code_to_link_rate(dpcd[DP_MAX_LINK_RATE]);
97 link_info->num_lanes = dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
98
99 /* Limit data lanes from data-lanes of endpoint property of dtsi */
100 if (link_info->num_lanes > dp_panel->max_dp_lanes)
101 link_info->num_lanes = dp_panel->max_dp_lanes;
102
103 /* Limit link rate from link-frequencies of endpoint property of dtsi */
104 if (link_info->rate > dp_panel->max_dp_link_rate)
105 link_info->rate = dp_panel->max_dp_link_rate;
106
107 drm_dbg_dp(panel->drm_dev, "version: %d.%d\n", major, minor);
108 drm_dbg_dp(panel->drm_dev, "link_rate=%d\n", link_info->rate);
109 drm_dbg_dp(panel->drm_dev, "lane_count=%d\n", link_info->num_lanes);
110
111 if (drm_dp_enhanced_frame_cap(dpcd))
112 link_info->capabilities |= DP_LINK_CAP_ENHANCED_FRAMING;
113
114 dp_panel->dfp_present = dpcd[DP_DOWNSTREAMPORT_PRESENT];
115 dp_panel->dfp_present &= DP_DWN_STRM_PORT_PRESENT;
116
117 if (dp_panel->dfp_present && (dpcd[DP_DPCD_REV] > 0x10)) {
118 dp_panel->ds_port_cnt = dpcd[DP_DOWN_STREAM_PORT_COUNT];
119 dp_panel->ds_port_cnt &= DP_PORT_COUNT_MASK;
120 len = DP_DOWNSTREAM_PORTS * DP_DOWNSTREAM_CAP_SIZE;
121
122 rlen = drm_dp_dpcd_read(panel->aux,
123 DP_DOWNSTREAM_PORT_0, dp_panel->ds_cap_info, len);
124 if (rlen < len) {
125 DRM_ERROR("ds port status failed, rlen=%zd\n", rlen);
126 rc = -EINVAL;
127 goto end;
128 }
129 }
130
131 dp_panel_read_psr_cap(panel);
132 end:
133 return rc;
134 }
135
dp_panel_get_supported_bpp(struct dp_panel * dp_panel,u32 mode_edid_bpp,u32 mode_pclk_khz)136 static u32 dp_panel_get_supported_bpp(struct dp_panel *dp_panel,
137 u32 mode_edid_bpp, u32 mode_pclk_khz)
138 {
139 struct dp_link_info *link_info;
140 const u32 max_supported_bpp = 30, min_supported_bpp = 18;
141 u32 bpp = 0, data_rate_khz = 0;
142
143 bpp = min_t(u32, mode_edid_bpp, max_supported_bpp);
144
145 link_info = &dp_panel->link_info;
146 data_rate_khz = link_info->num_lanes * link_info->rate * 8;
147
148 while (bpp > min_supported_bpp) {
149 if (mode_pclk_khz * bpp <= data_rate_khz)
150 break;
151 bpp -= 6;
152 }
153
154 return bpp;
155 }
156
dp_panel_update_modes(struct drm_connector * connector,struct edid * edid)157 static int dp_panel_update_modes(struct drm_connector *connector,
158 struct edid *edid)
159 {
160 int rc = 0;
161
162 if (edid) {
163 rc = drm_connector_update_edid_property(connector, edid);
164 if (rc) {
165 DRM_ERROR("failed to update edid property %d\n", rc);
166 return rc;
167 }
168 rc = drm_add_edid_modes(connector, edid);
169 return rc;
170 }
171
172 rc = drm_connector_update_edid_property(connector, NULL);
173 if (rc)
174 DRM_ERROR("failed to update edid property %d\n", rc);
175
176 return rc;
177 }
178
dp_panel_read_sink_caps(struct dp_panel * dp_panel,struct drm_connector * connector)179 int dp_panel_read_sink_caps(struct dp_panel *dp_panel,
180 struct drm_connector *connector)
181 {
182 int rc = 0, bw_code;
183 int rlen, count;
184 struct dp_panel_private *panel;
185
186 if (!dp_panel || !connector) {
187 DRM_ERROR("invalid input\n");
188 return -EINVAL;
189 }
190
191 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
192
193 rc = dp_panel_read_dpcd(dp_panel);
194 if (rc) {
195 DRM_ERROR("read dpcd failed %d\n", rc);
196 return rc;
197 }
198
199 bw_code = drm_dp_link_rate_to_bw_code(dp_panel->link_info.rate);
200 if (!is_link_rate_valid(bw_code) ||
201 !is_lane_count_valid(dp_panel->link_info.num_lanes) ||
202 (bw_code > dp_panel->max_bw_code)) {
203 DRM_ERROR("Illegal link rate=%d lane=%d\n", dp_panel->link_info.rate,
204 dp_panel->link_info.num_lanes);
205 return -EINVAL;
206 }
207
208 if (dp_panel->dfp_present) {
209 rlen = drm_dp_dpcd_read(panel->aux, DP_SINK_COUNT,
210 &count, 1);
211 if (rlen == 1) {
212 count = DP_GET_SINK_COUNT(count);
213 if (!count) {
214 DRM_ERROR("no downstream ports connected\n");
215 panel->link->sink_count = 0;
216 rc = -ENOTCONN;
217 goto end;
218 }
219 }
220 }
221
222 kfree(dp_panel->edid);
223 dp_panel->edid = NULL;
224
225 dp_panel->edid = drm_get_edid(connector,
226 &panel->aux->ddc);
227 if (!dp_panel->edid) {
228 DRM_ERROR("panel edid read failed\n");
229 /* check edid read fail is due to unplug */
230 if (!dp_catalog_link_is_connected(panel->catalog)) {
231 rc = -ETIMEDOUT;
232 goto end;
233 }
234 }
235
236 if (panel->aux_cfg_update_done) {
237 drm_dbg_dp(panel->drm_dev,
238 "read DPCD with updated AUX config\n");
239 rc = dp_panel_read_dpcd(dp_panel);
240 bw_code = drm_dp_link_rate_to_bw_code(dp_panel->link_info.rate);
241 if (rc || !is_link_rate_valid(bw_code) ||
242 !is_lane_count_valid(dp_panel->link_info.num_lanes)
243 || (bw_code > dp_panel->max_bw_code)) {
244 DRM_ERROR("read dpcd failed %d\n", rc);
245 return rc;
246 }
247 panel->aux_cfg_update_done = false;
248 }
249 end:
250 return rc;
251 }
252
dp_panel_get_mode_bpp(struct dp_panel * dp_panel,u32 mode_edid_bpp,u32 mode_pclk_khz)253 u32 dp_panel_get_mode_bpp(struct dp_panel *dp_panel,
254 u32 mode_edid_bpp, u32 mode_pclk_khz)
255 {
256 struct dp_panel_private *panel;
257 u32 bpp;
258
259 if (!dp_panel || !mode_edid_bpp || !mode_pclk_khz) {
260 DRM_ERROR("invalid input\n");
261 return 0;
262 }
263
264 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
265
266 if (dp_panel->video_test)
267 bpp = dp_link_bit_depth_to_bpp(
268 panel->link->test_video.test_bit_depth);
269 else
270 bpp = dp_panel_get_supported_bpp(dp_panel, mode_edid_bpp,
271 mode_pclk_khz);
272
273 return bpp;
274 }
275
dp_panel_get_modes(struct dp_panel * dp_panel,struct drm_connector * connector)276 int dp_panel_get_modes(struct dp_panel *dp_panel,
277 struct drm_connector *connector)
278 {
279 if (!dp_panel) {
280 DRM_ERROR("invalid input\n");
281 return -EINVAL;
282 }
283
284 if (dp_panel->edid)
285 return dp_panel_update_modes(connector, dp_panel->edid);
286
287 return 0;
288 }
289
dp_panel_get_edid_checksum(struct edid * edid)290 static u8 dp_panel_get_edid_checksum(struct edid *edid)
291 {
292 edid += edid->extensions;
293
294 return edid->checksum;
295 }
296
dp_panel_handle_sink_request(struct dp_panel * dp_panel)297 void dp_panel_handle_sink_request(struct dp_panel *dp_panel)
298 {
299 struct dp_panel_private *panel;
300
301 if (!dp_panel) {
302 DRM_ERROR("invalid input\n");
303 return;
304 }
305
306 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
307
308 if (panel->link->sink_request & DP_TEST_LINK_EDID_READ) {
309 u8 checksum;
310
311 if (dp_panel->edid)
312 checksum = dp_panel_get_edid_checksum(dp_panel->edid);
313 else
314 checksum = dp_panel->connector->real_edid_checksum;
315
316 dp_link_send_edid_checksum(panel->link, checksum);
317 dp_link_send_test_response(panel->link);
318 }
319 }
320
dp_panel_tpg_config(struct dp_panel * dp_panel,bool enable)321 void dp_panel_tpg_config(struct dp_panel *dp_panel, bool enable)
322 {
323 struct dp_catalog *catalog;
324 struct dp_panel_private *panel;
325
326 if (!dp_panel) {
327 DRM_ERROR("invalid input\n");
328 return;
329 }
330
331 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
332 catalog = panel->catalog;
333
334 if (!panel->panel_on) {
335 drm_dbg_dp(panel->drm_dev,
336 "DP panel not enabled, handle TPG on next on\n");
337 return;
338 }
339
340 if (!enable) {
341 dp_catalog_panel_tpg_disable(catalog);
342 return;
343 }
344
345 drm_dbg_dp(panel->drm_dev, "calling catalog tpg_enable\n");
346 dp_catalog_panel_tpg_enable(catalog, &panel->dp_panel.dp_mode.drm_mode);
347 }
348
dp_panel_dump_regs(struct dp_panel * dp_panel)349 void dp_panel_dump_regs(struct dp_panel *dp_panel)
350 {
351 struct dp_catalog *catalog;
352 struct dp_panel_private *panel;
353
354 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
355 catalog = panel->catalog;
356
357 dp_catalog_dump_regs(catalog);
358 }
359
dp_panel_timing_cfg(struct dp_panel * dp_panel)360 int dp_panel_timing_cfg(struct dp_panel *dp_panel)
361 {
362 u32 data, total_ver, total_hor;
363 struct dp_catalog *catalog;
364 struct dp_panel_private *panel;
365 struct drm_display_mode *drm_mode;
366
367 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
368 catalog = panel->catalog;
369 drm_mode = &panel->dp_panel.dp_mode.drm_mode;
370
371 drm_dbg_dp(panel->drm_dev, "width=%d hporch= %d %d %d\n",
372 drm_mode->hdisplay, drm_mode->htotal - drm_mode->hsync_end,
373 drm_mode->hsync_start - drm_mode->hdisplay,
374 drm_mode->hsync_end - drm_mode->hsync_start);
375
376 drm_dbg_dp(panel->drm_dev, "height=%d vporch= %d %d %d\n",
377 drm_mode->vdisplay, drm_mode->vtotal - drm_mode->vsync_end,
378 drm_mode->vsync_start - drm_mode->vdisplay,
379 drm_mode->vsync_end - drm_mode->vsync_start);
380
381 total_hor = drm_mode->htotal;
382
383 total_ver = drm_mode->vtotal;
384
385 data = total_ver;
386 data <<= 16;
387 data |= total_hor;
388
389 catalog->total = data;
390
391 data = (drm_mode->vtotal - drm_mode->vsync_start);
392 data <<= 16;
393 data |= (drm_mode->htotal - drm_mode->hsync_start);
394
395 catalog->sync_start = data;
396
397 data = drm_mode->vsync_end - drm_mode->vsync_start;
398 data <<= 16;
399 data |= (panel->dp_panel.dp_mode.v_active_low << 31);
400 data |= drm_mode->hsync_end - drm_mode->hsync_start;
401 data |= (panel->dp_panel.dp_mode.h_active_low << 15);
402
403 catalog->width_blanking = data;
404
405 data = drm_mode->vdisplay;
406 data <<= 16;
407 data |= drm_mode->hdisplay;
408
409 catalog->dp_active = data;
410
411 dp_catalog_panel_timing_cfg(catalog);
412 panel->panel_on = true;
413
414 return 0;
415 }
416
dp_panel_init_panel_info(struct dp_panel * dp_panel)417 int dp_panel_init_panel_info(struct dp_panel *dp_panel)
418 {
419 struct drm_display_mode *drm_mode;
420 struct dp_panel_private *panel;
421
422 drm_mode = &dp_panel->dp_mode.drm_mode;
423
424 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
425
426 /*
427 * print resolution info as this is a result
428 * of user initiated action of cable connection
429 */
430 drm_dbg_dp(panel->drm_dev, "SET NEW RESOLUTION:\n");
431 drm_dbg_dp(panel->drm_dev, "%dx%d@%dfps\n",
432 drm_mode->hdisplay, drm_mode->vdisplay, drm_mode_vrefresh(drm_mode));
433 drm_dbg_dp(panel->drm_dev,
434 "h_porches(back|front|width) = (%d|%d|%d)\n",
435 drm_mode->htotal - drm_mode->hsync_end,
436 drm_mode->hsync_start - drm_mode->hdisplay,
437 drm_mode->hsync_end - drm_mode->hsync_start);
438 drm_dbg_dp(panel->drm_dev,
439 "v_porches(back|front|width) = (%d|%d|%d)\n",
440 drm_mode->vtotal - drm_mode->vsync_end,
441 drm_mode->vsync_start - drm_mode->vdisplay,
442 drm_mode->vsync_end - drm_mode->vsync_start);
443 drm_dbg_dp(panel->drm_dev, "pixel clock (KHz)=(%d)\n",
444 drm_mode->clock);
445 drm_dbg_dp(panel->drm_dev, "bpp = %d\n", dp_panel->dp_mode.bpp);
446
447 dp_panel->dp_mode.bpp = max_t(u32, 18,
448 min_t(u32, dp_panel->dp_mode.bpp, 30));
449 drm_dbg_dp(panel->drm_dev, "updated bpp = %d\n",
450 dp_panel->dp_mode.bpp);
451
452 return 0;
453 }
454
dp_panel_get(struct dp_panel_in * in)455 struct dp_panel *dp_panel_get(struct dp_panel_in *in)
456 {
457 struct dp_panel_private *panel;
458 struct dp_panel *dp_panel;
459
460 if (!in->dev || !in->catalog || !in->aux || !in->link) {
461 DRM_ERROR("invalid input\n");
462 return ERR_PTR(-EINVAL);
463 }
464
465 panel = devm_kzalloc(in->dev, sizeof(*panel), GFP_KERNEL);
466 if (!panel)
467 return ERR_PTR(-ENOMEM);
468
469 panel->dev = in->dev;
470 panel->aux = in->aux;
471 panel->catalog = in->catalog;
472 panel->link = in->link;
473
474 dp_panel = &panel->dp_panel;
475 dp_panel->max_bw_code = DP_LINK_BW_8_1;
476 panel->aux_cfg_update_done = false;
477
478 return dp_panel;
479 }
480
dp_panel_put(struct dp_panel * dp_panel)481 void dp_panel_put(struct dp_panel *dp_panel)
482 {
483 if (!dp_panel)
484 return;
485
486 kfree(dp_panel->edid);
487 }
488