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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2013 Red Hat
* Author: Rob Clark <robdclark@gmail.com>
*/
#include <drm/display/drm_hdmi_helper.h>
#include <drm/display/drm_hdmi_state_helper.h>
#include <linux/hdmi.h>
#include <sound/hdmi-codec.h>
#include "hdmi.h"
int msm_hdmi_audio_update(struct hdmi *hdmi)
{
struct hdmi_audio *audio = &hdmi->audio;
bool enabled = audio->enabled;
uint32_t acr_pkt_ctrl, vbi_pkt_ctrl, aud_pkt_ctrl;
uint32_t audio_config;
if (!hdmi->connector->display_info.is_hdmi)
return -EINVAL;
DBG("audio: enabled=%d, channels=%d, rate=%d",
audio->enabled, audio->channels, 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;
}
/* 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);
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;
drm_hdmi_acr_get_n_cts(hdmi->pixclock, audio->rate, &n, &cts);
if (audio->rate == 192000 || audio->rate == 176400) {
multiplier = 4;
n >>= 2; /* divide N by 4 and use multiplier */
} else if (audio->rate == 96000 || audio->rate == 88200) {
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 (audio->rate == 48000 || audio->rate == 96000 ||
audio->rate == 192000)
select = ACR_48;
else if (audio->rate == 44100 || audio->rate == 88200 ||
audio->rate == 176400)
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(audio->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;
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;
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;
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_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_bridge_audio_prepare(struct drm_connector *connector,
struct drm_bridge *bridge,
struct hdmi_codec_daifmt *daifmt,
struct hdmi_codec_params *params)
{
struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
struct hdmi *hdmi = hdmi_bridge->hdmi;
int ret;
drm_dbg_driver(bridge->dev, "%u Hz, %d bit, %d channels\n",
params->sample_rate,
params->sample_width,
params->cea.channels);
switch (params->sample_rate) {
case 32000:
case 44100:
case 48000:
case 88200:
case 96000:
case 176400:
case 192000:
break;
default:
drm_err(bridge->dev, "rate[%d] not supported!\n",
params->sample_rate);
return -EINVAL;
}
ret = drm_atomic_helper_connector_hdmi_update_audio_infoframe(connector,
¶ms->cea);
if (ret)
return ret;
hdmi->audio.rate = params->sample_rate;
hdmi->audio.channels = params->cea.channels;
hdmi->audio.enabled = true;
return msm_hdmi_audio_update(hdmi);
}
void msm_hdmi_bridge_audio_shutdown(struct drm_connector *connector,
struct drm_bridge *bridge)
{
struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
struct hdmi *hdmi = hdmi_bridge->hdmi;
drm_atomic_helper_connector_hdmi_clear_audio_infoframe(connector);
hdmi->audio.rate = 0;
hdmi->audio.channels = 2;
hdmi->audio.enabled = false;
msm_hdmi_audio_update(hdmi);
}
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