1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2016-2020, The Linux Foundation. All rights reserved.
7 #define pr_fmt(fmt) "[drm-dp] %s: " fmt, __func__
9 #include <linux/platform_device.h>
11 #include <drm/display/drm_dp_helper.h>
12 #include <drm/drm_edid.h>
14 #include "dp_catalog.h"
17 #include "dp_display.h"
19 #define HEADER_BYTE_2_BIT 0
20 #define PARITY_BYTE_2_BIT 8
21 #define HEADER_BYTE_1_BIT 16
22 #define PARITY_BYTE_1_BIT 24
23 #define HEADER_BYTE_3_BIT 16
24 #define PARITY_BYTE_3_BIT 24
26 struct dp_audio_private {
27 struct platform_device *audio_pdev;
28 struct platform_device *pdev;
29 struct drm_device *drm_dev;
30 struct dp_catalog *catalog;
31 struct dp_panel *panel;
36 struct dp_audio dp_audio;
39 static u8 dp_audio_get_g0_value(u8 data)
46 for (i = 0; i < 4; i++)
47 c[i] = (data >> i) & 0x01;
54 for (i = 0; i < 4; i++)
55 ret_data = ((g[i] & 0x01) << i) | ret_data;
60 static u8 dp_audio_get_g1_value(u8 data)
67 for (i = 0; i < 4; i++)
68 c[i] = (data >> i) & 0x01;
71 g[1] = c[0] ^ c[1] ^ c[3];
75 for (i = 0; i < 4; i++)
76 ret_data = ((g[i] & 0x01) << i) | ret_data;
81 static u8 dp_audio_calculate_parity(u32 data)
89 u8 num_byte = (data & 0xFF00) > 0 ? 8 : 2;
91 for (i = 0; i < num_byte; i++) {
92 iData = (data >> i*4) & 0xF;
95 x1 = x0 ^ dp_audio_get_g1_value(ci);
96 x0 = dp_audio_get_g0_value(ci);
99 parity_byte = x1 | (x0 << 4);
104 static u32 dp_audio_get_header(struct dp_catalog *catalog,
105 enum dp_catalog_audio_sdp_type sdp,
106 enum dp_catalog_audio_header_type header)
108 catalog->sdp_type = sdp;
109 catalog->sdp_header = header;
110 dp_catalog_audio_get_header(catalog);
112 return catalog->audio_data;
115 static void dp_audio_set_header(struct dp_catalog *catalog,
117 enum dp_catalog_audio_sdp_type sdp,
118 enum dp_catalog_audio_header_type header)
120 catalog->sdp_type = sdp;
121 catalog->sdp_header = header;
122 catalog->audio_data = data;
123 dp_catalog_audio_set_header(catalog);
126 static void dp_audio_stream_sdp(struct dp_audio_private *audio)
128 struct dp_catalog *catalog = audio->catalog;
129 u32 value, new_value;
132 /* Config header and parity byte 1 */
133 value = dp_audio_get_header(catalog,
134 DP_AUDIO_SDP_STREAM, DP_AUDIO_SDP_HEADER_1);
137 parity_byte = dp_audio_calculate_parity(new_value);
138 value |= ((new_value << HEADER_BYTE_1_BIT)
139 | (parity_byte << PARITY_BYTE_1_BIT));
140 drm_dbg_dp(audio->drm_dev,
141 "Header Byte 1: value = 0x%x, parity_byte = 0x%x\n",
143 dp_audio_set_header(catalog, value,
144 DP_AUDIO_SDP_STREAM, DP_AUDIO_SDP_HEADER_1);
146 /* Config header and parity byte 2 */
147 value = dp_audio_get_header(catalog,
148 DP_AUDIO_SDP_STREAM, DP_AUDIO_SDP_HEADER_2);
150 parity_byte = dp_audio_calculate_parity(new_value);
151 value |= ((new_value << HEADER_BYTE_2_BIT)
152 | (parity_byte << PARITY_BYTE_2_BIT));
153 drm_dbg_dp(audio->drm_dev,
154 "Header Byte 2: value = 0x%x, parity_byte = 0x%x\n",
157 dp_audio_set_header(catalog, value,
158 DP_AUDIO_SDP_STREAM, DP_AUDIO_SDP_HEADER_2);
160 /* Config header and parity byte 3 */
161 value = dp_audio_get_header(catalog,
162 DP_AUDIO_SDP_STREAM, DP_AUDIO_SDP_HEADER_3);
164 new_value = audio->channels - 1;
165 parity_byte = dp_audio_calculate_parity(new_value);
166 value |= ((new_value << HEADER_BYTE_3_BIT)
167 | (parity_byte << PARITY_BYTE_3_BIT));
168 drm_dbg_dp(audio->drm_dev,
169 "Header Byte 3: value = 0x%x, parity_byte = 0x%x\n",
172 dp_audio_set_header(catalog, value,
173 DP_AUDIO_SDP_STREAM, DP_AUDIO_SDP_HEADER_3);
176 static void dp_audio_timestamp_sdp(struct dp_audio_private *audio)
178 struct dp_catalog *catalog = audio->catalog;
179 u32 value, new_value;
182 /* Config header and parity byte 1 */
183 value = dp_audio_get_header(catalog,
184 DP_AUDIO_SDP_TIMESTAMP, DP_AUDIO_SDP_HEADER_1);
187 parity_byte = dp_audio_calculate_parity(new_value);
188 value |= ((new_value << HEADER_BYTE_1_BIT)
189 | (parity_byte << PARITY_BYTE_1_BIT));
190 drm_dbg_dp(audio->drm_dev,
191 "Header Byte 1: value = 0x%x, parity_byte = 0x%x\n",
193 dp_audio_set_header(catalog, value,
194 DP_AUDIO_SDP_TIMESTAMP, DP_AUDIO_SDP_HEADER_1);
196 /* Config header and parity byte 2 */
197 value = dp_audio_get_header(catalog,
198 DP_AUDIO_SDP_TIMESTAMP, DP_AUDIO_SDP_HEADER_2);
201 parity_byte = dp_audio_calculate_parity(new_value);
202 value |= ((new_value << HEADER_BYTE_2_BIT)
203 | (parity_byte << PARITY_BYTE_2_BIT));
204 drm_dbg_dp(audio->drm_dev,
205 "Header Byte 2: value = 0x%x, parity_byte = 0x%x\n",
207 dp_audio_set_header(catalog, value,
208 DP_AUDIO_SDP_TIMESTAMP, DP_AUDIO_SDP_HEADER_2);
210 /* Config header and parity byte 3 */
211 value = dp_audio_get_header(catalog,
212 DP_AUDIO_SDP_TIMESTAMP, DP_AUDIO_SDP_HEADER_3);
214 new_value = (0x0 | (0x11 << 2));
215 parity_byte = dp_audio_calculate_parity(new_value);
216 value |= ((new_value << HEADER_BYTE_3_BIT)
217 | (parity_byte << PARITY_BYTE_3_BIT));
218 drm_dbg_dp(audio->drm_dev,
219 "Header Byte 3: value = 0x%x, parity_byte = 0x%x\n",
221 dp_audio_set_header(catalog, value,
222 DP_AUDIO_SDP_TIMESTAMP, DP_AUDIO_SDP_HEADER_3);
225 static void dp_audio_infoframe_sdp(struct dp_audio_private *audio)
227 struct dp_catalog *catalog = audio->catalog;
228 u32 value, new_value;
231 /* Config header and parity byte 1 */
232 value = dp_audio_get_header(catalog,
233 DP_AUDIO_SDP_INFOFRAME, DP_AUDIO_SDP_HEADER_1);
236 parity_byte = dp_audio_calculate_parity(new_value);
237 value |= ((new_value << HEADER_BYTE_1_BIT)
238 | (parity_byte << PARITY_BYTE_1_BIT));
239 drm_dbg_dp(audio->drm_dev,
240 "Header Byte 1: value = 0x%x, parity_byte = 0x%x\n",
242 dp_audio_set_header(catalog, value,
243 DP_AUDIO_SDP_INFOFRAME, DP_AUDIO_SDP_HEADER_1);
245 /* Config header and parity byte 2 */
246 value = dp_audio_get_header(catalog,
247 DP_AUDIO_SDP_INFOFRAME, DP_AUDIO_SDP_HEADER_2);
250 parity_byte = dp_audio_calculate_parity(new_value);
251 value |= ((new_value << HEADER_BYTE_2_BIT)
252 | (parity_byte << PARITY_BYTE_2_BIT));
253 drm_dbg_dp(audio->drm_dev,
254 "Header Byte 2: value = 0x%x, parity_byte = 0x%x\n",
256 dp_audio_set_header(catalog, value,
257 DP_AUDIO_SDP_INFOFRAME, DP_AUDIO_SDP_HEADER_2);
259 /* Config header and parity byte 3 */
260 value = dp_audio_get_header(catalog,
261 DP_AUDIO_SDP_INFOFRAME, DP_AUDIO_SDP_HEADER_3);
263 new_value = (0x0 | (0x11 << 2));
264 parity_byte = dp_audio_calculate_parity(new_value);
265 value |= ((new_value << HEADER_BYTE_3_BIT)
266 | (parity_byte << PARITY_BYTE_3_BIT));
267 drm_dbg_dp(audio->drm_dev,
268 "Header Byte 3: value = 0x%x, parity_byte = 0x%x\n",
269 new_value, parity_byte);
270 dp_audio_set_header(catalog, value,
271 DP_AUDIO_SDP_INFOFRAME, DP_AUDIO_SDP_HEADER_3);
274 static void dp_audio_copy_management_sdp(struct dp_audio_private *audio)
276 struct dp_catalog *catalog = audio->catalog;
277 u32 value, new_value;
280 /* Config header and parity byte 1 */
281 value = dp_audio_get_header(catalog,
282 DP_AUDIO_SDP_COPYMANAGEMENT, DP_AUDIO_SDP_HEADER_1);
285 parity_byte = dp_audio_calculate_parity(new_value);
286 value |= ((new_value << HEADER_BYTE_1_BIT)
287 | (parity_byte << PARITY_BYTE_1_BIT));
288 drm_dbg_dp(audio->drm_dev,
289 "Header Byte 1: value = 0x%x, parity_byte = 0x%x\n",
291 dp_audio_set_header(catalog, value,
292 DP_AUDIO_SDP_COPYMANAGEMENT, DP_AUDIO_SDP_HEADER_1);
294 /* Config header and parity byte 2 */
295 value = dp_audio_get_header(catalog,
296 DP_AUDIO_SDP_COPYMANAGEMENT, DP_AUDIO_SDP_HEADER_2);
299 parity_byte = dp_audio_calculate_parity(new_value);
300 value |= ((new_value << HEADER_BYTE_2_BIT)
301 | (parity_byte << PARITY_BYTE_2_BIT));
302 drm_dbg_dp(audio->drm_dev,
303 "Header Byte 2: value = 0x%x, parity_byte = 0x%x\n",
305 dp_audio_set_header(catalog, value,
306 DP_AUDIO_SDP_COPYMANAGEMENT, DP_AUDIO_SDP_HEADER_2);
308 /* Config header and parity byte 3 */
309 value = dp_audio_get_header(catalog,
310 DP_AUDIO_SDP_COPYMANAGEMENT, DP_AUDIO_SDP_HEADER_3);
313 parity_byte = dp_audio_calculate_parity(new_value);
314 value |= ((new_value << HEADER_BYTE_3_BIT)
315 | (parity_byte << PARITY_BYTE_3_BIT));
316 drm_dbg_dp(audio->drm_dev,
317 "Header Byte 3: value = 0x%x, parity_byte = 0x%x\n",
319 dp_audio_set_header(catalog, value,
320 DP_AUDIO_SDP_COPYMANAGEMENT, DP_AUDIO_SDP_HEADER_3);
323 static void dp_audio_isrc_sdp(struct dp_audio_private *audio)
325 struct dp_catalog *catalog = audio->catalog;
326 u32 value, new_value;
329 /* Config header and parity byte 1 */
330 value = dp_audio_get_header(catalog,
331 DP_AUDIO_SDP_ISRC, DP_AUDIO_SDP_HEADER_1);
334 parity_byte = dp_audio_calculate_parity(new_value);
335 value |= ((new_value << HEADER_BYTE_1_BIT)
336 | (parity_byte << PARITY_BYTE_1_BIT));
337 drm_dbg_dp(audio->drm_dev,
338 "Header Byte 1: value = 0x%x, parity_byte = 0x%x\n",
340 dp_audio_set_header(catalog, value,
341 DP_AUDIO_SDP_ISRC, DP_AUDIO_SDP_HEADER_1);
343 /* Config header and parity byte 2 */
344 value = dp_audio_get_header(catalog,
345 DP_AUDIO_SDP_ISRC, DP_AUDIO_SDP_HEADER_2);
348 parity_byte = dp_audio_calculate_parity(new_value);
349 value |= ((new_value << HEADER_BYTE_2_BIT)
350 | (parity_byte << PARITY_BYTE_2_BIT));
351 drm_dbg_dp(audio->drm_dev,
352 "Header Byte 2: value = 0x%x, parity_byte = 0x%x\n",
354 dp_audio_set_header(catalog, value,
355 DP_AUDIO_SDP_ISRC, DP_AUDIO_SDP_HEADER_2);
358 static void dp_audio_setup_sdp(struct dp_audio_private *audio)
360 dp_catalog_audio_config_sdp(audio->catalog);
362 dp_audio_stream_sdp(audio);
363 dp_audio_timestamp_sdp(audio);
364 dp_audio_infoframe_sdp(audio);
365 dp_audio_copy_management_sdp(audio);
366 dp_audio_isrc_sdp(audio);
369 static void dp_audio_setup_acr(struct dp_audio_private *audio)
372 struct dp_catalog *catalog = audio->catalog;
374 switch (audio->dp_audio.bw_code) {
375 case DP_LINK_BW_1_62:
388 drm_dbg_dp(audio->drm_dev, "Unknown link rate\n");
393 catalog->audio_data = select;
394 dp_catalog_audio_config_acr(catalog);
397 static void dp_audio_safe_to_exit_level(struct dp_audio_private *audio)
399 struct dp_catalog *catalog = audio->catalog;
400 u32 safe_to_exit_level = 0;
402 switch (audio->dp_audio.lane_count) {
404 safe_to_exit_level = 14;
407 safe_to_exit_level = 8;
410 safe_to_exit_level = 5;
413 drm_dbg_dp(audio->drm_dev,
414 "setting the default safe_to_exit_level = %u\n",
416 safe_to_exit_level = 14;
420 catalog->audio_data = safe_to_exit_level;
421 dp_catalog_audio_sfe_level(catalog);
424 static void dp_audio_enable(struct dp_audio_private *audio, bool enable)
426 struct dp_catalog *catalog = audio->catalog;
428 catalog->audio_data = enable;
429 dp_catalog_audio_enable(catalog);
431 audio->engine_on = enable;
434 static struct dp_audio_private *dp_audio_get_data(struct platform_device *pdev)
436 struct dp_audio *dp_audio;
437 struct msm_dp *dp_display;
440 DRM_ERROR("invalid input\n");
441 return ERR_PTR(-ENODEV);
444 dp_display = platform_get_drvdata(pdev);
446 DRM_ERROR("invalid input\n");
447 return ERR_PTR(-ENODEV);
450 dp_audio = dp_display->dp_audio;
453 DRM_ERROR("invalid dp_audio data\n");
454 return ERR_PTR(-EINVAL);
457 return container_of(dp_audio, struct dp_audio_private, dp_audio);
460 static int dp_audio_hook_plugged_cb(struct device *dev, void *data,
461 hdmi_codec_plugged_cb fn,
462 struct device *codec_dev)
465 struct platform_device *pdev;
466 struct msm_dp *dp_display;
468 pdev = to_platform_device(dev);
470 pr_err("invalid input\n");
474 dp_display = platform_get_drvdata(pdev);
476 pr_err("invalid input\n");
480 return dp_display_set_plugged_cb(dp_display, fn, codec_dev);
483 static int dp_audio_get_eld(struct device *dev,
484 void *data, uint8_t *buf, size_t len)
486 struct platform_device *pdev;
487 struct msm_dp *dp_display;
489 pdev = to_platform_device(dev);
492 DRM_ERROR("invalid input\n");
496 dp_display = platform_get_drvdata(pdev);
498 DRM_ERROR("invalid input\n");
502 memcpy(buf, dp_display->connector->eld,
503 min(sizeof(dp_display->connector->eld), len));
508 int dp_audio_hw_params(struct device *dev,
510 struct hdmi_codec_daifmt *daifmt,
511 struct hdmi_codec_params *params)
514 struct dp_audio_private *audio;
515 struct platform_device *pdev;
516 struct msm_dp *dp_display;
518 pdev = to_platform_device(dev);
519 dp_display = platform_get_drvdata(pdev);
522 * there could be cases where sound card can be opened even
523 * before OR even when DP is not connected . This can cause
524 * unclocked access as the audio subsystem relies on the DP
525 * driver to maintain the correct state of clocks. To protect
526 * such cases check for connection status and bail out if not
529 if (!dp_display->power_on) {
534 audio = dp_audio_get_data(pdev);
540 audio->channels = params->channels;
542 dp_audio_setup_sdp(audio);
543 dp_audio_setup_acr(audio);
544 dp_audio_safe_to_exit_level(audio);
545 dp_audio_enable(audio, true);
546 dp_display_signal_audio_start(dp_display);
547 dp_display->audio_enabled = true;
553 static void dp_audio_shutdown(struct device *dev, void *data)
555 struct dp_audio_private *audio;
556 struct platform_device *pdev;
557 struct msm_dp *dp_display;
559 pdev = to_platform_device(dev);
560 dp_display = platform_get_drvdata(pdev);
561 audio = dp_audio_get_data(pdev);
563 DRM_ERROR("failed to get audio data\n");
568 * if audio was not enabled there is no need
569 * to execute the shutdown and we can bail out early.
570 * This also makes sure that we dont cause an unclocked
571 * access when audio subsystem calls this without DP being
572 * connected. is_connected cannot be used here as its set
573 * to false earlier than this call
575 if (!dp_display->audio_enabled)
578 dp_audio_enable(audio, false);
579 /* signal the dp display to safely shutdown clocks */
580 dp_display_signal_audio_complete(dp_display);
583 static const struct hdmi_codec_ops dp_audio_codec_ops = {
584 .hw_params = dp_audio_hw_params,
585 .audio_shutdown = dp_audio_shutdown,
586 .get_eld = dp_audio_get_eld,
587 .hook_plugged_cb = dp_audio_hook_plugged_cb,
590 static struct hdmi_codec_pdata codec_data = {
591 .ops = &dp_audio_codec_ops,
592 .max_i2s_channels = 8,
596 void dp_unregister_audio_driver(struct device *dev, struct dp_audio *dp_audio)
598 struct dp_audio_private *audio_priv;
600 audio_priv = container_of(dp_audio, struct dp_audio_private, dp_audio);
602 if (audio_priv->audio_pdev) {
603 platform_device_unregister(audio_priv->audio_pdev);
604 audio_priv->audio_pdev = NULL;
608 int dp_register_audio_driver(struct device *dev,
609 struct dp_audio *dp_audio)
611 struct dp_audio_private *audio_priv;
613 audio_priv = container_of(dp_audio,
614 struct dp_audio_private, dp_audio);
616 audio_priv->audio_pdev = platform_device_register_data(dev,
621 return PTR_ERR_OR_ZERO(audio_priv->audio_pdev);
624 struct dp_audio *dp_audio_get(struct platform_device *pdev,
625 struct dp_panel *panel,
626 struct dp_catalog *catalog)
629 struct dp_audio_private *audio;
630 struct dp_audio *dp_audio;
632 if (!pdev || !panel || !catalog) {
633 DRM_ERROR("invalid input\n");
638 audio = devm_kzalloc(&pdev->dev, sizeof(*audio), GFP_KERNEL);
645 audio->panel = panel;
646 audio->catalog = catalog;
648 dp_audio = &audio->dp_audio;
650 dp_catalog_audio_init(catalog);
657 void dp_audio_put(struct dp_audio *dp_audio)
659 struct dp_audio_private *audio;
664 audio = container_of(dp_audio, struct dp_audio_private, dp_audio);
666 devm_kfree(&audio->pdev->dev, audio);