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-rw-r--r--target/linux/bcm27xx/patches-5.4/950-0920-vc4-Report-channel-mapping-back-to-userspace.patch504
1 files changed, 504 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0920-vc4-Report-channel-mapping-back-to-userspace.patch b/target/linux/bcm27xx/patches-5.4/950-0920-vc4-Report-channel-mapping-back-to-userspace.patch
new file mode 100644
index 0000000000..8c4e1012bf
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0920-vc4-Report-channel-mapping-back-to-userspace.patch
@@ -0,0 +1,504 @@
+From 058328afcdd3d5c9531cfac8b980d0c0db75856f Mon Sep 17 00:00:00 2001
+From: popcornmix <popcornmix@gmail.com>
+Date: Mon, 20 Apr 2020 18:00:38 +0100
+Subject: [PATCH] vc4: Report channel mapping back to userspace
+
+This follows logic in hdmi-codec.c to use speaker layout
+from ELD to choose a suitable speaker mapping based on
+number of channels requested and signal that in audio
+infoframe and report this back to userspace.
+
+This allows apps like speaker-test and kodi to get the
+output to the right speakers.
+
+Signed-off-by: Dom Cobley <popcornmix@gmail.com>
+---
+ drivers/gpu/drm/vc4/vc4_hdmi.c | 415 +++++++++++++++++++++++++++++++++
+ drivers/gpu/drm/vc4/vc4_hdmi.h | 3 +
+ 2 files changed, 418 insertions(+)
+
+--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
++++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
+@@ -48,6 +48,7 @@
+ #include <sound/pcm_drm_eld.h>
+ #include <sound/pcm_params.h>
+ #include <sound/soc.h>
++#include <sound/tlv.h>
+ #include "media/cec.h"
+ #include "vc4_drv.h"
+ #include "vc4_hdmi.h"
+@@ -82,6 +83,311 @@
+ #define CEC_CLOCK_FREQ 40000
+ #define VC4_HSM_CLOCK 163682864
+
++#define HDMI_CODEC_CHMAP_IDX_UNKNOWN -1
++
++/*
++ * CEA speaker placement for HDMI 1.4:
++ *
++ * FL FLC FC FRC FR FRW
++ *
++ * LFE
++ *
++ * RL RLC RC RRC RR
++ *
++ * Speaker placement has to be extended to support HDMI 2.0
++ */
++enum hdmi_codec_cea_spk_placement {
++ FL = BIT(0), /* Front Left */
++ FC = BIT(1), /* Front Center */
++ FR = BIT(2), /* Front Right */
++ FLC = BIT(3), /* Front Left Center */
++ FRC = BIT(4), /* Front Right Center */
++ RL = BIT(5), /* Rear Left */
++ RC = BIT(6), /* Rear Center */
++ RR = BIT(7), /* Rear Right */
++ RLC = BIT(8), /* Rear Left Center */
++ RRC = BIT(9), /* Rear Right Center */
++ LFE = BIT(10), /* Low Frequency Effect */
++};
++
++/*
++ * cea Speaker allocation structure
++ */
++struct hdmi_codec_cea_spk_alloc {
++ const int ca_id;
++ unsigned int n_ch;
++ unsigned long mask;
++};
++
++/* Channel maps stereo HDMI */
++static const struct snd_pcm_chmap_elem hdmi_codec_stereo_chmaps[] = {
++ { .channels = 2,
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
++ { }
++};
++
++/* Channel maps for multi-channel playbacks, up to 8 n_ch */
++static const struct snd_pcm_chmap_elem hdmi_codec_8ch_chmaps[] = {
++ { .channels = 2, /* CA_ID 0x00 */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
++ { .channels = 4, /* CA_ID 0x01 */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_LFE,
++ SNDRV_CHMAP_NA } },
++ { .channels = 4, /* CA_ID 0x02 */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_FC } },
++ { .channels = 4, /* CA_ID 0x03 */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_LFE,
++ SNDRV_CHMAP_FC } },
++ { .channels = 6, /* CA_ID 0x04 */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_NA, SNDRV_CHMAP_RC, SNDRV_CHMAP_NA } },
++ { .channels = 6, /* CA_ID 0x05 */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_LFE,
++ SNDRV_CHMAP_NA, SNDRV_CHMAP_RC, SNDRV_CHMAP_NA } },
++ { .channels = 6, /* CA_ID 0x06 */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_FC, SNDRV_CHMAP_RC, SNDRV_CHMAP_NA } },
++ { .channels = 6, /* CA_ID 0x07 */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_LFE,
++ SNDRV_CHMAP_FC, SNDRV_CHMAP_RC, SNDRV_CHMAP_NA } },
++ { .channels = 6, /* CA_ID 0x08 */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_NA, SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
++ { .channels = 6, /* CA_ID 0x09 */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_LFE,
++ SNDRV_CHMAP_NA, SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
++ { .channels = 6, /* CA_ID 0x0A */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_FC, SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
++ { .channels = 6, /* CA_ID 0x0B */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_LFE,
++ SNDRV_CHMAP_FC, SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
++ { .channels = 8, /* CA_ID 0x0C */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_NA, SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
++ SNDRV_CHMAP_RC, SNDRV_CHMAP_NA } },
++ { .channels = 8, /* CA_ID 0x0D */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_LFE,
++ SNDRV_CHMAP_NA, SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
++ SNDRV_CHMAP_RC, SNDRV_CHMAP_NA } },
++ { .channels = 8, /* CA_ID 0x0E */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_FC, SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
++ SNDRV_CHMAP_RC, SNDRV_CHMAP_NA } },
++ { .channels = 8, /* CA_ID 0x0F */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_LFE,
++ SNDRV_CHMAP_FC, SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
++ SNDRV_CHMAP_RC, SNDRV_CHMAP_NA } },
++ { .channels = 8, /* CA_ID 0x10 */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_NA, SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
++ SNDRV_CHMAP_RLC, SNDRV_CHMAP_RRC } },
++ { .channels = 8, /* CA_ID 0x11 */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_LFE,
++ SNDRV_CHMAP_NA, SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
++ SNDRV_CHMAP_RLC, SNDRV_CHMAP_RRC } },
++ { .channels = 8, /* CA_ID 0x12 */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_FC, SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
++ SNDRV_CHMAP_RLC, SNDRV_CHMAP_RRC } },
++ { .channels = 8, /* CA_ID 0x13 */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_LFE,
++ SNDRV_CHMAP_FC, SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
++ SNDRV_CHMAP_RLC, SNDRV_CHMAP_RRC } },
++ { .channels = 8, /* CA_ID 0x14 */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_NA, SNDRV_CHMAP_NA, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_FLC, SNDRV_CHMAP_FRC } },
++ { .channels = 8, /* CA_ID 0x15 */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_LFE,
++ SNDRV_CHMAP_NA, SNDRV_CHMAP_NA, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_FLC, SNDRV_CHMAP_FRC } },
++ { .channels = 8, /* CA_ID 0x16 */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_FC, SNDRV_CHMAP_NA, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_FLC, SNDRV_CHMAP_FRC } },
++ { .channels = 8, /* CA_ID 0x17 */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_LFE,
++ SNDRV_CHMAP_FC, SNDRV_CHMAP_NA, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_FLC, SNDRV_CHMAP_FRC } },
++ { .channels = 8, /* CA_ID 0x18 */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_NA, SNDRV_CHMAP_NA, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_FLC, SNDRV_CHMAP_FRC } },
++ { .channels = 8, /* CA_ID 0x19 */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_LFE,
++ SNDRV_CHMAP_NA, SNDRV_CHMAP_NA, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_FLC, SNDRV_CHMAP_FRC } },
++ { .channels = 8, /* CA_ID 0x1A */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_FC, SNDRV_CHMAP_NA, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_FLC, SNDRV_CHMAP_FRC } },
++ { .channels = 8, /* CA_ID 0x1B */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_LFE,
++ SNDRV_CHMAP_FC, SNDRV_CHMAP_NA, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_FLC, SNDRV_CHMAP_FRC } },
++ { .channels = 8, /* CA_ID 0x1C */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_NA, SNDRV_CHMAP_NA, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_FLC, SNDRV_CHMAP_FRC } },
++ { .channels = 8, /* CA_ID 0x1D */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_LFE,
++ SNDRV_CHMAP_NA, SNDRV_CHMAP_NA, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_FLC, SNDRV_CHMAP_FRC } },
++ { .channels = 8, /* CA_ID 0x1E */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_FC, SNDRV_CHMAP_NA, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_FLC, SNDRV_CHMAP_FRC } },
++ { .channels = 8, /* CA_ID 0x1F */
++ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_LFE,
++ SNDRV_CHMAP_FC, SNDRV_CHMAP_NA, SNDRV_CHMAP_NA,
++ SNDRV_CHMAP_FLC, SNDRV_CHMAP_FRC } },
++ { }
++};
++
++/*
++ * hdmi_codec_channel_alloc: speaker configuration available for CEA
++ *
++ * This is an ordered list that must match with hdmi_codec_8ch_chmaps struct
++ * The preceding ones have better chances to be selected by
++ * hdmi_codec_get_ch_alloc_table_idx().
++ */
++static const struct hdmi_codec_cea_spk_alloc hdmi_codec_channel_alloc[] = {
++ { .ca_id = 0x00, .n_ch = 2,
++ .mask = FL | FR},
++ /* 2.1 */
++ { .ca_id = 0x01, .n_ch = 4,
++ .mask = FL | FR | LFE},
++ /* Dolby Surround */
++ { .ca_id = 0x02, .n_ch = 4,
++ .mask = FL | FR | FC },
++ /* surround51 */
++ { .ca_id = 0x0b, .n_ch = 6,
++ .mask = FL | FR | LFE | FC | RL | RR},
++ /* surround40 */
++ { .ca_id = 0x08, .n_ch = 6,
++ .mask = FL | FR | RL | RR },
++ /* surround41 */
++ { .ca_id = 0x09, .n_ch = 6,
++ .mask = FL | FR | LFE | RL | RR },
++ /* surround50 */
++ { .ca_id = 0x0a, .n_ch = 6,
++ .mask = FL | FR | FC | RL | RR },
++ /* 6.1 */
++ { .ca_id = 0x0f, .n_ch = 8,
++ .mask = FL | FR | LFE | FC | RL | RR | RC },
++ /* surround71 */
++ { .ca_id = 0x13, .n_ch = 8,
++ .mask = FL | FR | LFE | FC | RL | RR | RLC | RRC },
++ /* others */
++ { .ca_id = 0x03, .n_ch = 8,
++ .mask = FL | FR | LFE | FC },
++ { .ca_id = 0x04, .n_ch = 8,
++ .mask = FL | FR | RC},
++ { .ca_id = 0x05, .n_ch = 8,
++ .mask = FL | FR | LFE | RC },
++ { .ca_id = 0x06, .n_ch = 8,
++ .mask = FL | FR | FC | RC },
++ { .ca_id = 0x07, .n_ch = 8,
++ .mask = FL | FR | LFE | FC | RC },
++ { .ca_id = 0x0c, .n_ch = 8,
++ .mask = FL | FR | RC | RL | RR },
++ { .ca_id = 0x0d, .n_ch = 8,
++ .mask = FL | FR | LFE | RL | RR | RC },
++ { .ca_id = 0x0e, .n_ch = 8,
++ .mask = FL | FR | FC | RL | RR | RC },
++ { .ca_id = 0x10, .n_ch = 8,
++ .mask = FL | FR | RL | RR | RLC | RRC },
++ { .ca_id = 0x11, .n_ch = 8,
++ .mask = FL | FR | LFE | RL | RR | RLC | RRC },
++ { .ca_id = 0x12, .n_ch = 8,
++ .mask = FL | FR | FC | RL | RR | RLC | RRC },
++ { .ca_id = 0x14, .n_ch = 8,
++ .mask = FL | FR | FLC | FRC },
++ { .ca_id = 0x15, .n_ch = 8,
++ .mask = FL | FR | LFE | FLC | FRC },
++ { .ca_id = 0x16, .n_ch = 8,
++ .mask = FL | FR | FC | FLC | FRC },
++ { .ca_id = 0x17, .n_ch = 8,
++ .mask = FL | FR | LFE | FC | FLC | FRC },
++ { .ca_id = 0x18, .n_ch = 8,
++ .mask = FL | FR | RC | FLC | FRC },
++ { .ca_id = 0x19, .n_ch = 8,
++ .mask = FL | FR | LFE | RC | FLC | FRC },
++ { .ca_id = 0x1a, .n_ch = 8,
++ .mask = FL | FR | RC | FC | FLC | FRC },
++ { .ca_id = 0x1b, .n_ch = 8,
++ .mask = FL | FR | LFE | RC | FC | FLC | FRC },
++ { .ca_id = 0x1c, .n_ch = 8,
++ .mask = FL | FR | RL | RR | FLC | FRC },
++ { .ca_id = 0x1d, .n_ch = 8,
++ .mask = FL | FR | LFE | RL | RR | FLC | FRC },
++ { .ca_id = 0x1e, .n_ch = 8,
++ .mask = FL | FR | FC | RL | RR | FLC | FRC },
++ { .ca_id = 0x1f, .n_ch = 8,
++ .mask = FL | FR | LFE | FC | RL | RR | FLC | FRC },
++};
++
++static unsigned long hdmi_codec_spk_mask_from_alloc(int spk_alloc)
++{
++ int i;
++ static const unsigned long hdmi_codec_eld_spk_alloc_bits[] = {
++ [0] = FL | FR, [1] = LFE, [2] = FC, [3] = RL | RR,
++ [4] = RC, [5] = FLC | FRC, [6] = RLC | RRC,
++ };
++ unsigned long spk_mask = 0;
++
++ for (i = 0; i < ARRAY_SIZE(hdmi_codec_eld_spk_alloc_bits); i++) {
++ if (spk_alloc & (1 << i))
++ spk_mask |= hdmi_codec_eld_spk_alloc_bits[i];
++ }
++
++ return spk_mask;
++}
++
++static int hdmi_codec_get_ch_alloc_table_idx(struct vc4_hdmi *vc4_hdmi,
++ unsigned char channels)
++{
++ struct drm_connector *connector = &vc4_hdmi->connector;
++ int i;
++ u8 spk_alloc;
++ unsigned long spk_mask;
++ const struct hdmi_codec_cea_spk_alloc *cap = hdmi_codec_channel_alloc;
++
++ spk_alloc = drm_eld_get_spk_alloc(connector->eld);
++ spk_mask = hdmi_codec_spk_mask_from_alloc(spk_alloc);
++
++ for (i = 0; i < ARRAY_SIZE(hdmi_codec_channel_alloc); i++, cap++) {
++ /* If spk_alloc == 0, HDMI is unplugged return stereo config*/
++ if (!spk_alloc && cap->ca_id == 0)
++ return i;
++ if (cap->n_ch != channels)
++ continue;
++ if (!(cap->mask == (spk_mask & cap->mask)))
++ continue;
++ return i;
++ }
++
++ return -EINVAL;
++}
++
++static void hdmi_codec_eld_chmap(struct vc4_hdmi *vc4_hdmi)
++{
++ struct drm_connector *connector = &vc4_hdmi->connector;
++ u8 spk_alloc;
++ unsigned long spk_mask;
++
++ spk_alloc = drm_eld_get_spk_alloc(connector->eld);
++ spk_mask = hdmi_codec_spk_mask_from_alloc(spk_alloc);
++
++ /* Detect if only stereo supported, else return 8 channels mappings */
++ if ((spk_mask & ~(FL | FR)))
++ vc4_hdmi->audio.chmap = hdmi_codec_8ch_chmaps;
++ else
++ vc4_hdmi->audio.chmap = hdmi_codec_stereo_chmaps;
++}
++
+ static int vc4_hdmi_debugfs_regs(struct seq_file *m, void *unused)
+ {
+ struct drm_info_node *node = (struct drm_info_node *)m->private;
+@@ -350,6 +656,9 @@ static void vc4_hdmi_set_audio_infoframe
+ frame.audio.sample_size = HDMI_AUDIO_SAMPLE_SIZE_STREAM;
+ frame.audio.channels = vc4_hdmi->audio.channels;
+
++ /* Select a channel allocation that matches with ELD and pcm channels */
++ frame.audio.channel_allocation = vc4_hdmi->audio.chmap_idx;
++
+ vc4_hdmi_write_infoframe(encoder, &frame);
+ }
+
+@@ -881,6 +1190,10 @@ static int vc4_hdmi_audio_startup(struct
+ if (ret)
+ return ret;
+
++ /* Select chmap supported */
++ vc4_hdmi->audio.max_channels = 8;
++ hdmi_codec_eld_chmap(vc4_hdmi);
++
+ return 0;
+ }
+
+@@ -967,6 +1280,7 @@ static int vc4_hdmi_audio_prepare(struct
+ u32 channel_map;
+ u32 mai_audio_format;
+ u32 mai_sample_rate;
++ int idx;
+
+ if (substream != vc4_hdmi->audio.substream)
+ return -EINVAL;
+@@ -1027,6 +1341,14 @@ static int vc4_hdmi_audio_prepare(struct
+ HDMI_WRITE(HDMI_AUDIO_PACKET_CONFIG, audio_packet_config);
+ vc4_hdmi_set_n_cts(vc4_hdmi);
+
++ idx = hdmi_codec_get_ch_alloc_table_idx(vc4_hdmi, vc4_hdmi->audio.channels);
++ if (idx < 0) {
++ DRM_ERROR("Not able to map channels to speakers (%d)\n", idx);
++ vc4_hdmi->audio.chmap_idx = HDMI_CODEC_CHMAP_IDX_UNKNOWN;
++ } else {
++ vc4_hdmi->audio.chmap_idx = hdmi_codec_channel_alloc[idx].ca_id;
++ }
++
+ return 0;
+ }
+
+@@ -1145,6 +1467,89 @@ static int vc4_spdif_mask_get(struct snd
+ return 0;
+ }
+
++/*
++ * ALSA API channel-map control callbacks
++ */
++static int vc4_chmap_ctl_info(struct snd_kcontrol *kcontrol,
++ struct snd_ctl_elem_info *uinfo)
++{
++ struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
++ struct vc4_hdmi *vc4_hdmi = snd_component_to_hdmi(component);
++
++ uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
++ uinfo->count = vc4_hdmi->audio.max_channels;
++ uinfo->value.integer.min = 0;
++ uinfo->value.integer.max = SNDRV_CHMAP_LAST;
++
++ return 0;
++}
++
++static int vc4_chmap_ctl_get(struct snd_kcontrol *kcontrol,
++ struct snd_ctl_elem_value *ucontrol)
++{
++ struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
++ struct vc4_hdmi *vc4_hdmi = snd_component_to_hdmi(component);
++ unsigned const char *map;
++ unsigned int i;
++
++ if (!vc4_hdmi->audio.chmap)
++ return -EINVAL;
++
++ map = vc4_hdmi->audio.chmap[vc4_hdmi->audio.chmap_idx].map;
++
++ for (i = 0; i < vc4_hdmi->audio.max_channels; i++) {
++ if (vc4_hdmi->audio.chmap_idx == HDMI_CODEC_CHMAP_IDX_UNKNOWN)
++ ucontrol->value.integer.value[i] = 0;
++ else
++ ucontrol->value.integer.value[i] = map[i];
++ }
++ return 0;
++}
++
++static int vc4_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
++ unsigned int size, unsigned int __user *tlv)
++{
++ struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
++ struct vc4_hdmi *vc4_hdmi = snd_component_to_hdmi(component);
++ const struct snd_pcm_chmap_elem *map;
++ unsigned int __user *dst;
++ int c, count = 0;
++
++ if (!vc4_hdmi->audio.chmap)
++ return -EINVAL;
++ if (size < 8)
++ return -ENOMEM;
++ if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
++ return -EFAULT;
++ size -= 8;
++ dst = tlv + 2;
++ for (map = vc4_hdmi->audio.chmap; map->channels; map++) {
++ int chs_bytes = map->channels * 4;
++ //if (!valid_chmap_channels(info, map->channels))
++ // continue;
++ if (size < 8)
++ return -ENOMEM;
++ if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
++ put_user(chs_bytes, dst + 1))
++ return -EFAULT;
++ dst += 2;
++ size -= 8;
++ count += 8;
++ if (size < chs_bytes)
++ return -ENOMEM;
++ size -= chs_bytes;
++ count += chs_bytes;
++ for (c = 0; c < map->channels; c++) {
++ if (put_user(map->map[c], dst))
++ return -EFAULT;
++ dst++;
++ }
++ }
++ if (put_user(count, tlv + 1))
++ return -EFAULT;
++ return 0;
++}
++
+ static const struct snd_kcontrol_new vc4_hdmi_audio_controls[] = {
+ {
+ .access = SNDRV_CTL_ELEM_ACCESS_READ |
+@@ -1167,6 +1572,16 @@ static const struct snd_kcontrol_new vc4
+ .info = vc4_spdif_info,
+ .get = vc4_spdif_mask_get,
+ },
++ {
++ .access = SNDRV_CTL_ELEM_ACCESS_READ |
++ SNDRV_CTL_ELEM_ACCESS_TLV_READ |
++ SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,
++ .iface = SNDRV_CTL_ELEM_IFACE_PCM,
++ .name = "Playback Channel Map",
++ .info = vc4_chmap_ctl_info,
++ .get = vc4_chmap_ctl_get,
++ .tlv.c = vc4_chmap_ctl_tlv,
++ },
+ };
+
+ static const struct snd_soc_dapm_widget vc4_hdmi_audio_widgets[] = {
+--- a/drivers/gpu/drm/vc4/vc4_hdmi.h
++++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
+@@ -117,6 +117,9 @@ struct vc4_hdmi_audio {
+ bool streaming;
+
+ unsigned char iec_status[4];
++ const struct snd_pcm_chmap_elem *chmap;
++ unsigned int chmap_idx;
++ unsigned int max_channels;
+ };
+
+ /* General HDMI hardware state. */
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-28 21:14:43 +0000