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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
12struct 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
22static 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
107end:
108 return rc;
109}
110
111static 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
132static 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 return rc;
145 }
146
147 rc = drm_connector_update_edid_property(connector, NULL);
148 if (rc)
149 DRM_ERROR("failed to update edid property %d\n", rc);
150
151 return rc;
152}
153
154int dp_panel_read_sink_caps(struct dp_panel *dp_panel,
155 struct drm_connector *connector)
156{
157 int rc = 0, bw_code;
158 int rlen, count;
159 struct dp_panel_private *panel;
160
161 if (!dp_panel || !connector) {
162 DRM_ERROR("invalid input\n");
163 return -EINVAL;
164 }
165
166 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
167
168 rc = dp_panel_read_dpcd(dp_panel);
169 if (rc) {
170 DRM_ERROR("read dpcd failed %d\n", rc);
171 return rc;
172 }
173
174 bw_code = drm_dp_link_rate_to_bw_code(dp_panel->link_info.rate);
175 if (!is_link_rate_valid(bw_code) ||
176 !is_lane_count_valid(dp_panel->link_info.num_lanes) ||
177 (bw_code > dp_panel->max_bw_code)) {
178 DRM_ERROR("Illegal link rate=%d lane=%d\n", dp_panel->link_info.rate,
179 dp_panel->link_info.num_lanes);
180 return -EINVAL;
181 }
182
183 if (dp_panel->dfp_present) {
184 rlen = drm_dp_dpcd_read(panel->aux, DP_SINK_COUNT,
185 &count, 1);
186 if (rlen == 1) {
187 count = DP_GET_SINK_COUNT(count);
188 if (!count) {
189 DRM_ERROR("no downstream ports connected\n");
190 panel->link->sink_count = 0;
191 rc = -ENOTCONN;
192 goto end;
193 }
194 }
195 }
196
197 kfree(dp_panel->edid);
198 dp_panel->edid = NULL;
199
200 dp_panel->edid = drm_get_edid(connector,
201 &panel->aux->ddc);
202 if (!dp_panel->edid) {
203 DRM_ERROR("panel edid read failed\n");
204 /* check edid read fail is due to unplug */
205 if (!dp_catalog_link_is_connected(panel->catalog)) {
206 rc = -ETIMEDOUT;
207 goto end;
208 }
209
210 /* fail safe edid */
211 mutex_lock(&connector->dev->mode_config.mutex);
212 if (drm_add_modes_noedid(connector, 640, 480))
213 drm_set_preferred_mode(connector, 640, 480);
214 mutex_unlock(&connector->dev->mode_config.mutex);
215 }
216
217 if (panel->aux_cfg_update_done) {
218 DRM_DEBUG_DP("read DPCD with updated AUX config\n");
219 rc = dp_panel_read_dpcd(dp_panel);
220 bw_code = drm_dp_link_rate_to_bw_code(dp_panel->link_info.rate);
221 if (rc || !is_link_rate_valid(bw_code) ||
222 !is_lane_count_valid(dp_panel->link_info.num_lanes)
223 || (bw_code > dp_panel->max_bw_code)) {
224 DRM_ERROR("read dpcd failed %d\n", rc);
225 return rc;
226 }
227 panel->aux_cfg_update_done = false;
228 }
229end:
230 return rc;
231}
232
233u32 dp_panel_get_mode_bpp(struct dp_panel *dp_panel,
234 u32 mode_edid_bpp, u32 mode_pclk_khz)
235{
236 struct dp_panel_private *panel;
237 u32 bpp = mode_edid_bpp;
238
239 if (!dp_panel || !mode_edid_bpp || !mode_pclk_khz) {
240 DRM_ERROR("invalid input\n");
241 return 0;
242 }
243
244 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
245
246 if (dp_panel->video_test)
247 bpp = dp_link_bit_depth_to_bpp(
248 panel->link->test_video.test_bit_depth);
249 else
250 bpp = dp_panel_get_supported_bpp(dp_panel, mode_edid_bpp,
251 mode_pclk_khz);
252
253 return bpp;
254}
255
256int dp_panel_get_modes(struct dp_panel *dp_panel,
257 struct drm_connector *connector, struct dp_display_mode *mode)
258{
259 if (!dp_panel) {
260 DRM_ERROR("invalid input\n");
261 return -EINVAL;
262 }
263
264 if (dp_panel->edid)
265 return dp_panel_update_modes(connector, dp_panel->edid);
266
267 return 0;
268}
269
270static u8 dp_panel_get_edid_checksum(struct edid *edid)
271{
272 struct edid *last_block;
273 u8 *raw_edid;
274 bool is_edid_corrupt = false;
275
276 if (!edid) {
277 DRM_ERROR("invalid edid input\n");
278 return 0;
279 }
280
281 raw_edid = (u8 *)edid;
282 raw_edid += (edid->extensions * EDID_LENGTH);
283 last_block = (struct edid *)raw_edid;
284
285 /* block type extension */
286 drm_edid_block_valid(raw_edid, 1, false, &is_edid_corrupt);
287 if (!is_edid_corrupt)
288 return last_block->checksum;
289
290 DRM_ERROR("Invalid block, no checksum\n");
291 return 0;
292}
293
294void dp_panel_handle_sink_request(struct dp_panel *dp_panel)
295{
296 struct dp_panel_private *panel;
297
298 if (!dp_panel) {
299 DRM_ERROR("invalid input\n");
300 return;
301 }
302
303 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
304
305 if (panel->link->sink_request & DP_TEST_LINK_EDID_READ) {
306 u8 checksum;
307
308 if (dp_panel->edid)
309 checksum = dp_panel_get_edid_checksum(dp_panel->edid);
310 else
311 checksum = dp_panel->connector->real_edid_checksum;
312
313 dp_link_send_edid_checksum(panel->link, checksum);
314 dp_link_send_test_response(panel->link);
315 }
316}
317
318void dp_panel_tpg_config(struct dp_panel *dp_panel, bool enable)
319{
320 struct dp_catalog *catalog;
321 struct dp_panel_private *panel;
322
323 if (!dp_panel) {
324 DRM_ERROR("invalid input\n");
325 return;
326 }
327
328 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
329 catalog = panel->catalog;
330
331 if (!panel->panel_on) {
332 DRM_DEBUG_DP("DP panel not enabled, handle TPG on next on\n");
333 return;
334 }
335
336 if (!enable) {
337 dp_catalog_panel_tpg_disable(catalog);
338 return;
339 }
340
341 DRM_DEBUG_DP("%s: calling catalog tpg_enable\n", __func__);
342 dp_catalog_panel_tpg_enable(catalog, &panel->dp_panel.dp_mode.drm_mode);
343}
344
345void dp_panel_dump_regs(struct dp_panel *dp_panel)
346{
347 struct dp_catalog *catalog;
348 struct dp_panel_private *panel;
349
350 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
351 catalog = panel->catalog;
352
353 dp_catalog_dump_regs(catalog);
354}
355
356int dp_panel_timing_cfg(struct dp_panel *dp_panel)
357{
358 u32 data, total_ver, total_hor;
359 struct dp_catalog *catalog;
360 struct dp_panel_private *panel;
361 struct drm_display_mode *drm_mode;
362
363 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
364 catalog = panel->catalog;
365 drm_mode = &panel->dp_panel.dp_mode.drm_mode;
366
367 DRM_DEBUG_DP("width=%d hporch= %d %d %d\n",
368 drm_mode->hdisplay, drm_mode->htotal - drm_mode->hsync_end,
369 drm_mode->hsync_start - drm_mode->hdisplay,
370 drm_mode->hsync_end - drm_mode->hsync_start);
371
372 DRM_DEBUG_DP("height=%d vporch= %d %d %d\n",
373 drm_mode->vdisplay, drm_mode->vtotal - drm_mode->vsync_end,
374 drm_mode->vsync_start - drm_mode->vdisplay,
375 drm_mode->vsync_end - drm_mode->vsync_start);
376
377 total_hor = drm_mode->htotal;
378
379 total_ver = drm_mode->vtotal;
380
381 data = total_ver;
382 data <<= 16;
383 data |= total_hor;
384
385 catalog->total = data;
386
387 data = (drm_mode->vtotal - drm_mode->vsync_start);
388 data <<= 16;
389 data |= (drm_mode->htotal - drm_mode->hsync_start);
390
391 catalog->sync_start = data;
392
393 data = drm_mode->vsync_end - drm_mode->vsync_start;
394 data <<= 16;
395 data |= (panel->dp_panel.dp_mode.v_active_low << 31);
396 data |= drm_mode->hsync_end - drm_mode->hsync_start;
397 data |= (panel->dp_panel.dp_mode.h_active_low << 15);
398
399 catalog->width_blanking = data;
400
401 data = drm_mode->vdisplay;
402 data <<= 16;
403 data |= drm_mode->hdisplay;
404
405 catalog->dp_active = data;
406
407 dp_catalog_panel_timing_cfg(catalog);
408 panel->panel_on = true;
409
410 return 0;
411}
412
413int dp_panel_init_panel_info(struct dp_panel *dp_panel)
414{
415 struct drm_display_mode *drm_mode;
416
417 drm_mode = &dp_panel->dp_mode.drm_mode;
418
419 /*
420 * print resolution info as this is a result
421 * of user initiated action of cable connection
422 */
423 DRM_DEBUG_DP("SET NEW RESOLUTION:\n");
424 DRM_DEBUG_DP("%dx%d@%dfps\n", drm_mode->hdisplay,
425 drm_mode->vdisplay, drm_mode_vrefresh(drm_mode));
426 DRM_DEBUG_DP("h_porches(back|front|width) = (%d|%d|%d)\n",
427 drm_mode->htotal - drm_mode->hsync_end,
428 drm_mode->hsync_start - drm_mode->hdisplay,
429 drm_mode->hsync_end - drm_mode->hsync_start);
430 DRM_DEBUG_DP("v_porches(back|front|width) = (%d|%d|%d)\n",
431 drm_mode->vtotal - drm_mode->vsync_end,
432 drm_mode->vsync_start - drm_mode->vdisplay,
433 drm_mode->vsync_end - drm_mode->vsync_start);
434 DRM_DEBUG_DP("pixel clock (KHz)=(%d)\n", drm_mode->clock);
435 DRM_DEBUG_DP("bpp = %d\n", dp_panel->dp_mode.bpp);
436
437 dp_panel->dp_mode.bpp = max_t(u32, 18,
438 min_t(u32, dp_panel->dp_mode.bpp, 30));
439 DRM_DEBUG_DP("updated bpp = %d\n", dp_panel->dp_mode.bpp);
440
441 return 0;
442}
443
444struct dp_panel *dp_panel_get(struct dp_panel_in *in)
445{
446 struct dp_panel_private *panel;
447 struct dp_panel *dp_panel;
448
449 if (!in->dev || !in->catalog || !in->aux || !in->link) {
450 DRM_ERROR("invalid input\n");
451 return ERR_PTR(-EINVAL);
452 }
453
454 panel = devm_kzalloc(in->dev, sizeof(*panel), GFP_KERNEL);
455 if (!panel)
456 return ERR_PTR(-ENOMEM);
457
458 panel->dev = in->dev;
459 panel->aux = in->aux;
460 panel->catalog = in->catalog;
461 panel->link = in->link;
462
463 dp_panel = &panel->dp_panel;
464 dp_panel->max_bw_code = DP_LINK_BW_8_1;
465 panel->aux_cfg_update_done = false;
466
467 return dp_panel;
468}
469
470void dp_panel_put(struct dp_panel *dp_panel)
471{
472 if (!dp_panel)
473 return;
474
475 kfree(dp_panel->edid);
476}