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Diffstat (limited to 'sound/hda/codecs/hdmi/eld.c')
-rw-r--r--sound/hda/codecs/hdmi/eld.c402
1 files changed, 402 insertions, 0 deletions
diff --git a/sound/hda/codecs/hdmi/eld.c b/sound/hda/codecs/hdmi/eld.c
new file mode 100644
index 000000000000..d3e87b9c1a4f
--- /dev/null
+++ b/sound/hda/codecs/hdmi/eld.c
@@ -0,0 +1,402 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Generic routines and proc interface for ELD(EDID Like Data) information
+ *
+ * Copyright(c) 2008 Intel Corporation.
+ * Copyright (c) 2013 Anssi Hannula <anssi.hannula@iki.fi>
+ *
+ * Authors:
+ * Wu Fengguang <wfg@linux.intel.com>
+ */
+
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <linux/unaligned.h>
+#include <sound/hda_chmap.h>
+#include <sound/hda_codec.h>
+#include "hda_local.h"
+
+enum cea_edid_versions {
+ CEA_EDID_VER_NONE = 0,
+ CEA_EDID_VER_CEA861 = 1,
+ CEA_EDID_VER_CEA861A = 2,
+ CEA_EDID_VER_CEA861BCD = 3,
+ CEA_EDID_VER_RESERVED = 4,
+};
+
+/*
+ * The following two lists are shared between
+ * - HDMI audio InfoFrame (source to sink)
+ * - CEA E-EDID Extension (sink to source)
+ */
+
+static unsigned int hdmi_get_eld_data(struct hda_codec *codec, hda_nid_t nid,
+ int byte_index)
+{
+ unsigned int val;
+
+ val = snd_hda_codec_read(codec, nid, 0,
+ AC_VERB_GET_HDMI_ELDD, byte_index);
+#ifdef BE_PARANOID
+ codec_info(codec, "HDMI: ELD data byte %d: 0x%x\n", byte_index, val);
+#endif
+ return val;
+}
+
+int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
+{
+ return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
+ AC_DIPSIZE_ELD_BUF);
+}
+
+int snd_hdmi_get_eld(struct hda_codec *codec, hda_nid_t nid,
+ unsigned char *buf, int *eld_size)
+{
+ int i;
+ int ret = 0;
+ int size;
+
+ /*
+ * ELD size is initialized to zero in caller function. If no errors and
+ * ELD is valid, actual eld_size is assigned.
+ */
+
+ size = snd_hdmi_get_eld_size(codec, nid);
+ if (size == 0) {
+ /* wfg: workaround for ASUS P5E-VM HDMI board */
+ codec_info(codec, "HDMI: ELD buf size is 0, force 128\n");
+ size = 128;
+ }
+ if (size < ELD_FIXED_BYTES || size > ELD_MAX_SIZE) {
+ codec_info(codec, "HDMI: invalid ELD buf size %d\n", size);
+ return -ERANGE;
+ }
+
+ /* set ELD buffer */
+ for (i = 0; i < size; i++) {
+ unsigned int val = hdmi_get_eld_data(codec, nid, i);
+ /*
+ * Graphics driver might be writing to ELD buffer right now.
+ * Just abort. The caller will repoll after a while.
+ */
+ if (!(val & AC_ELDD_ELD_VALID)) {
+ codec_info(codec, "HDMI: invalid ELD data byte %d\n", i);
+ ret = -EINVAL;
+ goto error;
+ }
+ val &= AC_ELDD_ELD_DATA;
+ /*
+ * The first byte cannot be zero. This can happen on some DVI
+ * connections. Some Intel chips may also need some 250ms delay
+ * to return non-zero ELD data, even when the graphics driver
+ * correctly writes ELD content before setting ELD_valid bit.
+ */
+ if (!val && !i) {
+ codec_dbg(codec, "HDMI: 0 ELD data\n");
+ ret = -EINVAL;
+ goto error;
+ }
+ buf[i] = val;
+ }
+
+ *eld_size = size;
+error:
+ return ret;
+}
+
+#ifdef CONFIG_SND_PROC_FS
+void snd_hdmi_print_eld_info(struct hdmi_eld *eld,
+ struct snd_info_buffer *buffer,
+ hda_nid_t pin_nid, int dev_id, hda_nid_t cvt_nid)
+{
+ snd_iprintf(buffer, "monitor_present\t\t%d\n", eld->monitor_present);
+ snd_iprintf(buffer, "eld_valid\t\t%d\n", eld->eld_valid);
+ snd_iprintf(buffer, "codec_pin_nid\t\t0x%x\n", pin_nid);
+ snd_iprintf(buffer, "codec_dev_id\t\t0x%x\n", dev_id);
+ snd_iprintf(buffer, "codec_cvt_nid\t\t0x%x\n", cvt_nid);
+
+ if (!eld->eld_valid)
+ return;
+
+ snd_print_eld_info(&eld->info, buffer);
+}
+
+void snd_hdmi_write_eld_info(struct hdmi_eld *eld,
+ struct snd_info_buffer *buffer)
+{
+ struct snd_parsed_hdmi_eld *e = &eld->info;
+ char line[64];
+ char name[64];
+ char *sname;
+ long long val;
+ unsigned int n;
+
+ while (!snd_info_get_line(buffer, line, sizeof(line))) {
+ if (sscanf(line, "%s %llx", name, &val) != 2)
+ continue;
+ /*
+ * We don't allow modification to these fields:
+ * monitor_name manufacture_id product_id
+ * eld_version edid_version
+ */
+ if (!strcmp(name, "monitor_present"))
+ eld->monitor_present = val;
+ else if (!strcmp(name, "eld_valid"))
+ eld->eld_valid = val;
+ else if (!strcmp(name, "connection_type"))
+ e->conn_type = val;
+ else if (!strcmp(name, "port_id"))
+ e->port_id = val;
+ else if (!strcmp(name, "support_hdcp"))
+ e->support_hdcp = val;
+ else if (!strcmp(name, "support_ai"))
+ e->support_ai = val;
+ else if (!strcmp(name, "audio_sync_delay"))
+ e->aud_synch_delay = val;
+ else if (!strcmp(name, "speakers"))
+ e->spk_alloc = val;
+ else if (!strcmp(name, "sad_count"))
+ e->sad_count = val;
+ else if (!strncmp(name, "sad", 3)) {
+ sname = name + 4;
+ n = name[3] - '0';
+ if (name[4] >= '0' && name[4] <= '9') {
+ sname++;
+ n = 10 * n + name[4] - '0';
+ }
+ if (n >= ELD_MAX_SAD)
+ continue;
+ if (!strcmp(sname, "_coding_type"))
+ e->sad[n].format = val;
+ else if (!strcmp(sname, "_channels"))
+ e->sad[n].channels = val;
+ else if (!strcmp(sname, "_rates"))
+ e->sad[n].rates = val;
+ else if (!strcmp(sname, "_bits"))
+ e->sad[n].sample_bits = val;
+ else if (!strcmp(sname, "_max_bitrate"))
+ e->sad[n].max_bitrate = val;
+ else if (!strcmp(sname, "_profile"))
+ e->sad[n].profile = val;
+ if (n >= e->sad_count)
+ e->sad_count = n + 1;
+ }
+ }
+}
+#endif /* CONFIG_SND_PROC_FS */
+
+/* update PCM info based on ELD */
+void snd_hdmi_eld_update_pcm_info(struct snd_parsed_hdmi_eld *e,
+ struct hda_pcm_stream *hinfo)
+{
+ u32 rates;
+ u64 formats;
+ unsigned int maxbps;
+ unsigned int channels_max;
+ int i;
+
+ /* assume basic audio support (the basic audio flag is not in ELD;
+ * however, all audio capable sinks are required to support basic
+ * audio) */
+ rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
+ SNDRV_PCM_RATE_48000;
+ formats = SNDRV_PCM_FMTBIT_S16_LE;
+ maxbps = 16;
+ channels_max = 2;
+ for (i = 0; i < e->sad_count; i++) {
+ struct snd_cea_sad *a = &e->sad[i];
+ rates |= a->rates;
+ if (a->channels > channels_max)
+ channels_max = a->channels;
+ if (a->format == AUDIO_CODING_TYPE_LPCM) {
+ if (a->sample_bits & ELD_PCM_BITS_20) {
+ formats |= SNDRV_PCM_FMTBIT_S32_LE;
+ if (maxbps < 20)
+ maxbps = 20;
+ }
+ if (a->sample_bits & ELD_PCM_BITS_24) {
+ formats |= SNDRV_PCM_FMTBIT_S32_LE;
+ if (maxbps < 24)
+ maxbps = 24;
+ }
+ }
+ }
+
+ /* restrict the parameters by the values the codec provides */
+ hinfo->rates &= rates;
+ hinfo->formats &= formats;
+ hinfo->maxbps = min(hinfo->maxbps, maxbps);
+ hinfo->channels_max = min(hinfo->channels_max, channels_max);
+}
+
+
+/* ATI/AMD specific stuff (ELD emulation) */
+
+#define ATI_VERB_SET_AUDIO_DESCRIPTOR 0x776
+#define ATI_VERB_SET_SINK_INFO_INDEX 0x780
+#define ATI_VERB_GET_SPEAKER_ALLOCATION 0xf70
+#define ATI_VERB_GET_AUDIO_DESCRIPTOR 0xf76
+#define ATI_VERB_GET_AUDIO_VIDEO_DELAY 0xf7b
+#define ATI_VERB_GET_SINK_INFO_INDEX 0xf80
+#define ATI_VERB_GET_SINK_INFO_DATA 0xf81
+
+#define ATI_SPKALLOC_SPKALLOC 0x007f
+#define ATI_SPKALLOC_TYPE_HDMI 0x0100
+#define ATI_SPKALLOC_TYPE_DISPLAYPORT 0x0200
+
+/* first three bytes are just standard SAD */
+#define ATI_AUDIODESC_CHANNELS 0x00000007
+#define ATI_AUDIODESC_RATES 0x0000ff00
+#define ATI_AUDIODESC_LPCM_STEREO_RATES 0xff000000
+
+/* in standard HDMI VSDB format */
+#define ATI_DELAY_VIDEO_LATENCY 0x000000ff
+#define ATI_DELAY_AUDIO_LATENCY 0x0000ff00
+
+enum ati_sink_info_idx {
+ ATI_INFO_IDX_MANUFACTURER_ID = 0,
+ ATI_INFO_IDX_PRODUCT_ID = 1,
+ ATI_INFO_IDX_SINK_DESC_LEN = 2,
+ ATI_INFO_IDX_PORT_ID_LOW = 3,
+ ATI_INFO_IDX_PORT_ID_HIGH = 4,
+ ATI_INFO_IDX_SINK_DESC_FIRST = 5,
+ ATI_INFO_IDX_SINK_DESC_LAST = 22, /* max len 18 bytes */
+};
+
+int snd_hdmi_get_eld_ati(struct hda_codec *codec, hda_nid_t nid,
+ unsigned char *buf, int *eld_size, bool rev3_or_later)
+{
+ int spkalloc, ati_sad, aud_synch;
+ int sink_desc_len = 0;
+ int pos, i;
+
+ /* ATI/AMD does not have ELD, emulate it */
+
+ spkalloc = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SPEAKER_ALLOCATION, 0);
+
+ if (spkalloc <= 0) {
+ codec_info(codec, "HDMI ATI/AMD: no speaker allocation for ELD\n");
+ return -EINVAL;
+ }
+
+ memset(buf, 0, ELD_FIXED_BYTES + ELD_MAX_MNL + ELD_MAX_SAD * 3);
+
+ /* version */
+ buf[0] = ELD_VER_CEA_861D << 3;
+
+ /* speaker allocation from EDID */
+ buf[7] = spkalloc & ATI_SPKALLOC_SPKALLOC;
+
+ /* is DisplayPort? */
+ if (spkalloc & ATI_SPKALLOC_TYPE_DISPLAYPORT)
+ buf[5] |= 0x04;
+
+ pos = ELD_FIXED_BYTES;
+
+ if (rev3_or_later) {
+ int sink_info;
+
+ snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PORT_ID_LOW);
+ sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
+ put_unaligned_le32(sink_info, buf + 8);
+
+ snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PORT_ID_HIGH);
+ sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
+ put_unaligned_le32(sink_info, buf + 12);
+
+ snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_MANUFACTURER_ID);
+ sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
+ put_unaligned_le16(sink_info, buf + 16);
+
+ snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PRODUCT_ID);
+ sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
+ put_unaligned_le16(sink_info, buf + 18);
+
+ snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_SINK_DESC_LEN);
+ sink_desc_len = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
+
+ if (sink_desc_len > ELD_MAX_MNL) {
+ codec_info(codec, "HDMI ATI/AMD: Truncating HDMI sink description with length %d\n",
+ sink_desc_len);
+ sink_desc_len = ELD_MAX_MNL;
+ }
+
+ buf[4] |= sink_desc_len;
+
+ for (i = 0; i < sink_desc_len; i++) {
+ snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_SINK_DESC_FIRST + i);
+ buf[pos++] = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
+ }
+ }
+
+ for (i = AUDIO_CODING_TYPE_LPCM; i <= AUDIO_CODING_TYPE_WMAPRO; i++) {
+ if (i == AUDIO_CODING_TYPE_SACD || i == AUDIO_CODING_TYPE_DST)
+ continue; /* not handled by ATI/AMD */
+
+ snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_AUDIO_DESCRIPTOR, i << 3);
+ ati_sad = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_AUDIO_DESCRIPTOR, 0);
+
+ if (ati_sad <= 0)
+ continue;
+
+ if (ati_sad & ATI_AUDIODESC_RATES) {
+ /* format is supported, copy SAD as-is */
+ buf[pos++] = (ati_sad & 0x0000ff) >> 0;
+ buf[pos++] = (ati_sad & 0x00ff00) >> 8;
+ buf[pos++] = (ati_sad & 0xff0000) >> 16;
+ }
+
+ if (i == AUDIO_CODING_TYPE_LPCM
+ && (ati_sad & ATI_AUDIODESC_LPCM_STEREO_RATES)
+ && (ati_sad & ATI_AUDIODESC_LPCM_STEREO_RATES) >> 16 != (ati_sad & ATI_AUDIODESC_RATES)) {
+ /* for PCM there is a separate stereo rate mask */
+ buf[pos++] = ((ati_sad & 0x000000ff) & ~ATI_AUDIODESC_CHANNELS) | 0x1;
+ /* rates from the extra byte */
+ buf[pos++] = (ati_sad & 0xff000000) >> 24;
+ buf[pos++] = (ati_sad & 0x00ff0000) >> 16;
+ }
+ }
+
+ if (pos == ELD_FIXED_BYTES + sink_desc_len) {
+ codec_info(codec, "HDMI ATI/AMD: no audio descriptors for ELD\n");
+ return -EINVAL;
+ }
+
+ /*
+ * HDMI VSDB latency format:
+ * separately for both audio and video:
+ * 0 field not valid or unknown latency
+ * [1..251] msecs = (x-1)*2 (max 500ms with x = 251 = 0xfb)
+ * 255 audio/video not supported
+ *
+ * HDA latency format:
+ * single value indicating video latency relative to audio:
+ * 0 unknown or 0ms
+ * [1..250] msecs = x*2 (max 500ms with x = 250 = 0xfa)
+ * [251..255] reserved
+ */
+ aud_synch = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_AUDIO_VIDEO_DELAY, 0);
+ if ((aud_synch & ATI_DELAY_VIDEO_LATENCY) && (aud_synch & ATI_DELAY_AUDIO_LATENCY)) {
+ int video_latency_hdmi = (aud_synch & ATI_DELAY_VIDEO_LATENCY);
+ int audio_latency_hdmi = (aud_synch & ATI_DELAY_AUDIO_LATENCY) >> 8;
+
+ if (video_latency_hdmi <= 0xfb && audio_latency_hdmi <= 0xfb &&
+ video_latency_hdmi > audio_latency_hdmi)
+ buf[6] = video_latency_hdmi - audio_latency_hdmi;
+ /* else unknown/invalid or 0ms or video ahead of audio, so use zero */
+ }
+
+ /* SAD count */
+ buf[5] |= ((pos - ELD_FIXED_BYTES - sink_desc_len) / 3) << 4;
+
+ /* Baseline ELD block length is 4-byte aligned */
+ pos = round_up(pos, 4);
+
+ /* Baseline ELD length (4-byte header is not counted in) */
+ buf[2] = (pos - 4) / 4;
+
+ *eld_size = pos;
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.0.4) at 2025-10-24 13:27:22 +0000