[alsa-devel] [PATCH 3/5] ALSA: hda - hdmi: Add ELD emulation for ATI/AMD codecs
Anssi Hannula
anssi.hannula at iki.fi
Thu Oct 24 20:10:36 CEST 2013
ATI/AMD HDMI/DP codecs do not include standard HDA ELD (EDID-like data)
support.
In place of providing access to an ELD buffer, various vendor-specific
verbs are provided to provide the relevant information. Revision ID 3
and later (0x100300 as reported by procfs codec#X) have support for
providing more information than the previous revisions (but only if
supported by the display driver).
Generate ELD from the information provided by the vendor-specific verbs
on ATI/AMD codecs.
The specification is available at:
http://www.x.org/docs/AMD/AMD_HDA_verbs_v2.pdf
v2: moved code to hda_eld.c and cleaned it up
v3: adapted to hdmi_ops infrastructure
Signed-off-by: Anssi Hannula <anssi.hannula at iki.fi>
Tested-by: Peter Frühberger <fritsch at xbmc.org> # v2
Tested-by: Olivier Langlois <olivier at trillion01.com> # v2
---
sound/pci/hda/hda_eld.c | 151 +++++++++++++++++++++++++++++++++++++++++++++
sound/pci/hda/hda_local.h | 4 ++
sound/pci/hda/patch_hdmi.c | 9 +++
3 files changed, 164 insertions(+)
diff --git a/sound/pci/hda/hda_eld.c b/sound/pci/hda/hda_eld.c
index f62356c..32d3e38 100644
--- a/sound/pci/hda/hda_eld.c
+++ b/sound/pci/hda/hda_eld.c
@@ -2,6 +2,7 @@
* Generic routines and proc interface for ELD(EDID Like Data) information
*
* Copyright(c) 2008 Intel Corporation.
+ * Copyright (c) 2013 Anssi Hannula <anssi.hannula at iki.fi>
*
* Authors:
* Wu Fengguang <wfg at linux.intel.com>
@@ -633,3 +634,153 @@ void snd_hdmi_eld_update_pcm_info(struct parsed_hdmi_eld *e,
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) {
+ snd_printd(KERN_INFO "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) {
+ snd_printd(KERN_INFO "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 & 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) {
+ snd_printd(KERN_INFO "HDMI ATI/AMD: no audio descriptors for ELD\n");
+ return -EINVAL;
+ }
+
+ 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 = (aud_synch & ATI_DELAY_VIDEO_LATENCY) - 1;
+ int audio_latency = ((aud_synch & ATI_DELAY_AUDIO_LATENCY) >> 8) - 1;
+
+ if (video_latency > audio_latency)
+ buf[6] = min(video_latency - audio_latency, 0xfa);
+ }
+
+ /* Baseline length */
+ buf[2] = pos - 4;
+
+ /* SAD count */
+ buf[5] |= ((pos - ELD_FIXED_BYTES - sink_desc_len) / 3) << 4;
+
+ *eld_size = pos;
+
+ return 0;
+}
diff --git a/sound/pci/hda/hda_local.h b/sound/pci/hda/hda_local.h
index 46cddd4..d398b64 100644
--- a/sound/pci/hda/hda_local.h
+++ b/sound/pci/hda/hda_local.h
@@ -763,6 +763,10 @@ void snd_hdmi_show_eld(struct parsed_hdmi_eld *e);
void snd_hdmi_eld_update_pcm_info(struct parsed_hdmi_eld *e,
struct hda_pcm_stream *hinfo);
+int snd_hdmi_get_eld_ati(struct hda_codec *codec, hda_nid_t nid,
+ unsigned char *buf, int *eld_size,
+ bool rev3_or_later);
+
#ifdef CONFIG_PROC_FS
void snd_hdmi_print_eld_info(struct hdmi_eld *eld,
struct snd_info_buffer *buffer);
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index 4ef5676..75ba933 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -2822,6 +2822,14 @@ static int patch_nvhdmi_8ch_7x(struct hda_codec *codec)
#define ATI_MULTICHANNEL_MODE_PAIRED 0
#define ATI_MULTICHANNEL_MODE_SINGLE 1
+static int atihdmi_pin_get_eld(struct hda_codec *codec, hda_nid_t nid,
+ unsigned char *buf, int *eld_size)
+{
+ /* call hda_eld.c ATI/AMD-specific function */
+ return snd_hdmi_get_eld_ati(codec, nid, buf, eld_size,
+ is_amdhdmi_rev3_or_later(codec));
+}
+
static void atihdmi_pin_setup_infoframe(struct hda_codec *codec, hda_nid_t pin_nid, int ca,
int active_channels, int conn_type)
{
@@ -3049,6 +3057,7 @@ static int patch_atihdmi(struct hda_codec *codec)
spec = codec->spec;
+ spec->ops.pin_get_eld = atihdmi_pin_get_eld;
spec->ops.pin_get_slot_channel = atihdmi_pin_get_slot_channel;
spec->ops.pin_set_slot_channel = atihdmi_pin_set_slot_channel;
spec->ops.pin_setup_infoframe = atihdmi_pin_setup_infoframe;
--
1.8.1.5
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