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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2013 Red Hat
* Author: Rob Clark <robdclark@gmail.com>
*/
#include <linux/hdmi.h>
#include "hdmi.h"
/* maps MSM_HDMI_AUDIO_CHANNEL_n consts used by audio driver to # of channels: */
static int nchannels[] = { 2, 4, 6, 8 };
/* Supported HDMI Audio sample rates */
#define MSM_HDMI_SAMPLE_RATE_32KHZ 0
#define MSM_HDMI_SAMPLE_RATE_44_1KHZ 1
#define MSM_HDMI_SAMPLE_RATE_48KHZ 2
#define MSM_HDMI_SAMPLE_RATE_88_2KHZ 3
#define MSM_HDMI_SAMPLE_RATE_96KHZ 4
#define MSM_HDMI_SAMPLE_RATE_176_4KHZ 5
#define MSM_HDMI_SAMPLE_RATE_192KHZ 6
#define MSM_HDMI_SAMPLE_RATE_MAX 7
struct hdmi_msm_audio_acr {
uint32_t n; /* N parameter for clock regeneration */
uint32_t cts; /* CTS parameter for clock regeneration */
};
struct hdmi_msm_audio_arcs {
unsigned long int pixclock;
struct hdmi_msm_audio_acr lut[MSM_HDMI_SAMPLE_RATE_MAX];
};
#define HDMI_MSM_AUDIO_ARCS(pclk, ...) { (1000 * (pclk)), __VA_ARGS__ }
/* Audio constants lookup table for hdmi_msm_audio_acr_setup */
/* Valid Pixel-Clock rates: 25.2MHz, 27MHz, 27.03MHz, 74.25MHz, 148.5MHz */
static const struct hdmi_msm_audio_arcs acr_lut[] = {
/* 25.200MHz */
HDMI_MSM_AUDIO_ARCS(25200, {
{4096, 25200}, {6272, 28000}, {6144, 25200}, {12544, 28000},
{12288, 25200}, {25088, 28000}, {24576, 25200} }),
/* 27.000MHz */
HDMI_MSM_AUDIO_ARCS(27000, {
{4096, 27000}, {6272, 30000}, {6144, 27000}, {12544, 30000},
{12288, 27000}, {25088, 30000}, {24576, 27000} }),
/* 27.027MHz */
HDMI_MSM_AUDIO_ARCS(27030, {
{4096, 27027}, {6272, 30030}, {6144, 27027}, {12544, 30030},
{12288, 27027}, {25088, 30030}, {24576, 27027} }),
/* 74.250MHz */
HDMI_MSM_AUDIO_ARCS(74250, {
{4096, 74250}, {6272, 82500}, {6144, 74250}, {12544, 82500},
{12288, 74250}, {25088, 82500}, {24576, 74250} }),
/* 148.500MHz */
HDMI_MSM_AUDIO_ARCS(148500, {
{4096, 148500}, {6272, 165000}, {6144, 148500}, {12544, 165000},
{12288, 148500}, {25088, 165000}, {24576, 148500} }),
};
static const struct hdmi_msm_audio_arcs *get_arcs(unsigned long int pixclock)
{
int i;
for (i = 0; i < ARRAY_SIZE(acr_lut); i++) {
const struct hdmi_msm_audio_arcs *arcs = &acr_lut[i];
if (arcs->pixclock == pixclock)
return arcs;
}
return NULL;
}
int msm_hdmi_audio_update(struct hdmi *hdmi)
{
struct hdmi_audio *audio = &hdmi->audio;
struct hdmi_audio_infoframe *info = &audio->infoframe;
const struct hdmi_msm_audio_arcs *arcs = NULL;
bool enabled = audio->enabled;
uint32_t acr_pkt_ctrl, vbi_pkt_ctrl, aud_pkt_ctrl;
uint32_t infofrm_ctrl, audio_config;
DBG("audio: enabled=%d, channels=%d, channel_allocation=0x%x, "
"level_shift_value=%d, downmix_inhibit=%d, rate=%d",
audio->enabled, info->channels, info->channel_allocation,
info->level_shift_value, info->downmix_inhibit, audio->rate);
DBG("video: power_on=%d, pixclock=%lu", hdmi->power_on, hdmi->pixclock);
if (enabled && !(hdmi->power_on && hdmi->pixclock)) {
DBG("disabling audio: no video");
enabled = false;
}
if (enabled) {
arcs = get_arcs(hdmi->pixclock);
if (!arcs) {
DBG("disabling audio: unsupported pixclock: %lu",
hdmi->pixclock);
enabled = false;
}
}
/* Read first before writing */
acr_pkt_ctrl = hdmi_read(hdmi, REG_HDMI_ACR_PKT_CTRL);
vbi_pkt_ctrl = hdmi_read(hdmi, REG_HDMI_VBI_PKT_CTRL);
aud_pkt_ctrl = hdmi_read(hdmi, REG_HDMI_AUDIO_PKT_CTRL1);
infofrm_ctrl = hdmi_read(hdmi, REG_HDMI_INFOFRAME_CTRL0);
audio_config = hdmi_read(hdmi, REG_HDMI_AUDIO_CFG);
/* Clear N/CTS selection bits */
acr_pkt_ctrl &= ~HDMI_ACR_PKT_CTRL_SELECT__MASK;
if (enabled) {
uint32_t n, cts, multiplier;
enum hdmi_acr_cts select;
uint8_t buf[14];
n = arcs->lut[audio->rate].n;
cts = arcs->lut[audio->rate].cts;
if ((MSM_HDMI_SAMPLE_RATE_192KHZ == audio->rate) ||
(MSM_HDMI_SAMPLE_RATE_176_4KHZ == audio->rate)) {
multiplier = 4;
n >>= 2; /* divide N by 4 and use multiplier */
} else if ((MSM_HDMI_SAMPLE_RATE_96KHZ == audio->rate) ||
(MSM_HDMI_SAMPLE_RATE_88_2KHZ == audio->rate)) {
multiplier = 2;
n >>= 1; /* divide N by 2 and use multiplier */
} else {
multiplier = 1;
}
DBG("n=%u, cts=%u, multiplier=%u", n, cts, multiplier);
acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_SOURCE;
acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_AUDIO_PRIORITY;
acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_N_MULTIPLIER(multiplier);
if ((MSM_HDMI_SAMPLE_RATE_48KHZ == audio->rate) ||
(MSM_HDMI_SAMPLE_RATE_96KHZ == audio->rate) ||
(MSM_HDMI_SAMPLE_RATE_192KHZ == audio->rate))
select = ACR_48;
else if ((MSM_HDMI_SAMPLE_RATE_44_1KHZ == audio->rate) ||
(MSM_HDMI_SAMPLE_RATE_88_2KHZ == audio->rate) ||
(MSM_HDMI_SAMPLE_RATE_176_4KHZ == audio->rate))
select = ACR_44;
else /* default to 32k */
select = ACR_32;
acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_SELECT(select);
hdmi_write(hdmi, REG_HDMI_ACR_0(select - 1),
HDMI_ACR_0_CTS(cts));
hdmi_write(hdmi, REG_HDMI_ACR_1(select - 1),
HDMI_ACR_1_N(n));
hdmi_write(hdmi, REG_HDMI_AUDIO_PKT_CTRL2,
COND(info->channels != 2, HDMI_AUDIO_PKT_CTRL2_LAYOUT) |
HDMI_AUDIO_PKT_CTRL2_OVERRIDE);
acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_CONT;
acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_SEND;
/* configure infoframe: */
hdmi_audio_infoframe_pack(info, buf, sizeof(buf));
hdmi_write(hdmi, REG_HDMI_AUDIO_INFO0,
(buf[3] << 0) | (buf[4] << 8) |
(buf[5] << 16) | (buf[6] << 24));
hdmi_write(hdmi, REG_HDMI_AUDIO_INFO1,
(buf[7] << 0) | (buf[8] << 8));
hdmi_write(hdmi, REG_HDMI_GC, 0);
vbi_pkt_ctrl |= HDMI_VBI_PKT_CTRL_GC_ENABLE;
vbi_pkt_ctrl |= HDMI_VBI_PKT_CTRL_GC_EVERY_FRAME;
aud_pkt_ctrl |= HDMI_AUDIO_PKT_CTRL1_AUDIO_SAMPLE_SEND;
infofrm_ctrl |= HDMI_INFOFRAME_CTRL0_AUDIO_INFO_SEND;
infofrm_ctrl |= HDMI_INFOFRAME_CTRL0_AUDIO_INFO_CONT;
infofrm_ctrl |= HDMI_INFOFRAME_CTRL0_AUDIO_INFO_SOURCE;
infofrm_ctrl |= HDMI_INFOFRAME_CTRL0_AUDIO_INFO_UPDATE;
audio_config &= ~HDMI_AUDIO_CFG_FIFO_WATERMARK__MASK;
audio_config |= HDMI_AUDIO_CFG_FIFO_WATERMARK(4);
audio_config |= HDMI_AUDIO_CFG_ENGINE_ENABLE;
} else {
acr_pkt_ctrl &= ~HDMI_ACR_PKT_CTRL_CONT;
acr_pkt_ctrl &= ~HDMI_ACR_PKT_CTRL_SEND;
vbi_pkt_ctrl &= ~HDMI_VBI_PKT_CTRL_GC_ENABLE;
vbi_pkt_ctrl &= ~HDMI_VBI_PKT_CTRL_GC_EVERY_FRAME;
aud_pkt_ctrl &= ~HDMI_AUDIO_PKT_CTRL1_AUDIO_SAMPLE_SEND;
infofrm_ctrl &= ~HDMI_INFOFRAME_CTRL0_AUDIO_INFO_SEND;
infofrm_ctrl &= ~HDMI_INFOFRAME_CTRL0_AUDIO_INFO_CONT;
infofrm_ctrl &= ~HDMI_INFOFRAME_CTRL0_AUDIO_INFO_SOURCE;
infofrm_ctrl &= ~HDMI_INFOFRAME_CTRL0_AUDIO_INFO_UPDATE;
audio_config &= ~HDMI_AUDIO_CFG_ENGINE_ENABLE;
}
hdmi_write(hdmi, REG_HDMI_ACR_PKT_CTRL, acr_pkt_ctrl);
hdmi_write(hdmi, REG_HDMI_VBI_PKT_CTRL, vbi_pkt_ctrl);
hdmi_write(hdmi, REG_HDMI_AUDIO_PKT_CTRL1, aud_pkt_ctrl);
hdmi_write(hdmi, REG_HDMI_INFOFRAME_CTRL0, infofrm_ctrl);
hdmi_write(hdmi, REG_HDMI_AUD_INT,
COND(enabled, HDMI_AUD_INT_AUD_FIFO_URUN_INT) |
COND(enabled, HDMI_AUD_INT_AUD_SAM_DROP_INT));
hdmi_write(hdmi, REG_HDMI_AUDIO_CFG, audio_config);
DBG("audio %sabled", enabled ? "en" : "dis");
return 0;
}
int msm_hdmi_audio_info_setup(struct hdmi *hdmi, bool enabled,
uint32_t num_of_channels, uint32_t channel_allocation,
uint32_t level_shift, bool down_mix)
{
struct hdmi_audio *audio;
if (!hdmi)
return -ENXIO;
audio = &hdmi->audio;
if (num_of_channels >= ARRAY_SIZE(nchannels))
return -EINVAL;
audio->enabled = enabled;
audio->infoframe.channels = nchannels[num_of_channels];
audio->infoframe.channel_allocation = channel_allocation;
audio->infoframe.level_shift_value = level_shift;
audio->infoframe.downmix_inhibit = down_mix;
return msm_hdmi_audio_update(hdmi);
}
void msm_hdmi_audio_set_sample_rate(struct hdmi *hdmi, int rate)
{
struct hdmi_audio *audio;
if (!hdmi)
return;
audio = &hdmi->audio;
if ((rate < 0) || (rate >= MSM_HDMI_SAMPLE_RATE_MAX))
return;
audio->rate = rate;
msm_hdmi_audio_update(hdmi);
}
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