Re: [PATCH v2 5/5] drm: bridge: dw_hdmi: Audio: Add General Parallel Audio (GPA) driver
From: Neil Armstrong
Date: Fri Apr 08 2022 - 08:51:47 EST
On 08/04/2022 12:32, Sandor Yu wrote:
General Parallel Audio (GPA) interface is one of the supported
audio interface for synopsys HDMI module, which has verified for
i.MX8MPlus platform.
This is initial version for GPA.
Signed-off-by: Shengjiu Wang <shengjiu.wang@xxxxxxx>
Signed-off-by: Sandor Yu <Sandor.yu@xxxxxxx>
---
drivers/gpu/drm/bridge/synopsys/Kconfig | 10 +
drivers/gpu/drm/bridge/synopsys/Makefile | 1 +
.../drm/bridge/synopsys/dw-hdmi-gp-audio.c | 199 ++++++++++++++++++
drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 128 ++++++++++-
drivers/gpu/drm/bridge/synopsys/dw-hdmi.h | 13 +-
include/drm/bridge/dw_hdmi.h | 5 +
6 files changed, 353 insertions(+), 3 deletions(-)
create mode 100644 drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c
diff --git a/drivers/gpu/drm/bridge/synopsys/Kconfig b/drivers/gpu/drm/bridge/synopsys/Kconfig
index 21a1be3ced0f..a4a31b669b65 100644
--- a/drivers/gpu/drm/bridge/synopsys/Kconfig
+++ b/drivers/gpu/drm/bridge/synopsys/Kconfig
@@ -25,6 +25,16 @@ config DRM_DW_HDMI_I2S_AUDIO
Support the I2S Audio interface which is part of the Synopsys
Designware HDMI block.
+config DRM_DW_HDMI_GP_AUDIO
+ tristate "Synopsys Designware GP Audio interface"
+ depends on DRM_DW_HDMI && SND
+ select SND_PCM
+ select SND_PCM_ELD
+ select SND_PCM_IEC958
+ help
+ Support the GP Audio interface which is part of the Synopsys
+ Designware HDMI block.
+
config DRM_DW_HDMI_CEC
tristate "Synopsis Designware CEC interface"
depends on DRM_DW_HDMI
diff --git a/drivers/gpu/drm/bridge/synopsys/Makefile b/drivers/gpu/drm/bridge/synopsys/Makefile
index 91d746ad5de1..ce715562e9e5 100644
--- a/drivers/gpu/drm/bridge/synopsys/Makefile
+++ b/drivers/gpu/drm/bridge/synopsys/Makefile
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0-only
obj-$(CONFIG_DRM_DW_HDMI) += dw-hdmi.o
obj-$(CONFIG_DRM_DW_HDMI_AHB_AUDIO) += dw-hdmi-ahb-audio.o
+obj-$(CONFIG_DRM_DW_HDMI_GP_AUDIO) += dw-hdmi-gp-audio.o
obj-$(CONFIG_DRM_DW_HDMI_I2S_AUDIO) += dw-hdmi-i2s-audio.o
obj-$(CONFIG_DRM_DW_HDMI_CEC) += dw-hdmi-cec.o
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c
new file mode 100644
index 000000000000..10a957c85a83
--- /dev/null
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c
@@ -0,0 +1,199 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * dw-hdmi-gp-audio.c
+ *
+ * Copyright 2020-2022 NXP
+ */
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <drm/bridge/dw_hdmi.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_connector.h>
+
+#include <sound/hdmi-codec.h>
+#include <sound/asoundef.h>
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/pcm_drm_eld.h>
+#include <sound/pcm_iec958.h>
+#include <sound/dmaengine_pcm.h>
+
+#include "dw-hdmi-audio.h"
+
+#define DRIVER_NAME "dw-hdmi-gp-audio"
+#define DRV_NAME "hdmi-gp-audio"
+
+struct snd_dw_hdmi {
+ struct dw_hdmi_audio_data data;
+ struct platform_device *audio_pdev;
+ unsigned int pos;
+};
+
+struct dw_hdmi_channel_conf {
+ u8 conf1;
+ u8 ca;
+};
+
+/*
+ * The default mapping of ALSA channels to HDMI channels and speaker
+ * allocation bits. Note that we can't do channel remapping here -
+ * channels must be in the same order.
+ *
+ * Mappings for alsa-lib pcm/surround*.conf files:
+ *
+ * Front Sur4.0 Sur4.1 Sur5.0 Sur5.1 Sur7.1
+ * Channels 2 4 6 6 6 8
+ *
+ * Our mapping from ALSA channel to CEA686D speaker name and HDMI channel:
+ *
+ * Number of ALSA channels
+ * ALSA Channel 2 3 4 5 6 7 8
+ * 0 FL:0 = = = = = =
+ * 1 FR:1 = = = = = =
+ * 2 FC:3 RL:4 LFE:2 = = =
+ * 3 RR:5 RL:4 FC:3 = =
+ * 4 RR:5 RL:4 = =
+ * 5 RR:5 = =
+ * 6 RC:6 =
+ * 7 RLC/FRC RLC/FRC
+ */
+static struct dw_hdmi_channel_conf default_hdmi_channel_config[7] = {
+ { 0x03, 0x00 }, /* FL,FR */
+ { 0x0b, 0x02 }, /* FL,FR,FC */
+ { 0x33, 0x08 }, /* FL,FR,RL,RR */
+ { 0x37, 0x09 }, /* FL,FR,LFE,RL,RR */
+ { 0x3f, 0x0b }, /* FL,FR,LFE,FC,RL,RR */
+ { 0x7f, 0x0f }, /* FL,FR,LFE,FC,RL,RR,RC */
+ { 0xff, 0x13 }, /* FL,FR,LFE,FC,RL,RR,[FR]RC,[FR]LC */
+};
+
+static int audio_hw_params(struct device *dev, void *data,
+ struct hdmi_codec_daifmt *daifmt,
+ struct hdmi_codec_params *params)
+{
+ struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
+ int ret = 0;
+ u8 ca;
+
+ dw_hdmi_set_sample_rate(dw->data.hdmi, params->sample_rate);
+
+ ca = default_hdmi_channel_config[params->channels - 2].ca;
+
+ dw_hdmi_set_channel_count(dw->data.hdmi, params->channels);
+ dw_hdmi_set_channel_allocation(dw->data.hdmi, ca);
+
+ dw_hdmi_set_sample_non_pcm(dw->data.hdmi,
+ params->iec.status[0] & IEC958_AES0_NONAUDIO);
+ dw_hdmi_set_sample_width(dw->data.hdmi, params->sample_width);
+
+ return ret;
+}
+
+static void audio_shutdown(struct device *dev, void *data)
+{
+}
+
+static int audio_mute_stream(struct device *dev, void *data,
+ bool enable, int direction)
+{
+ struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
+ int ret = 0;
+
+ if (!enable)
+ dw_hdmi_audio_enable(dw->data.hdmi);
+ else
+ dw_hdmi_audio_disable(dw->data.hdmi);
+
+ return ret;
+}
+
+static int audio_get_eld(struct device *dev, void *data,
+ u8 *buf, size_t len)
+{
+ struct dw_hdmi_audio_data *audio = data;
+ u8 *eld;
+
+ eld = audio->get_eld(audio->hdmi);
+ if (eld)
+ memcpy(buf, eld, min_t(size_t, MAX_ELD_BYTES, len));
+ else
+ /* Pass en empty ELD if connector not available */
+ memset(buf, 0, len);
+
+ return 0;
+}
+
+static int audio_hook_plugged_cb(struct device *dev, void *data,
+ hdmi_codec_plugged_cb fn,
+ struct device *codec_dev)
+{
+ struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
+
+ return dw_hdmi_set_plugged_cb(dw->data.hdmi, fn, codec_dev);
+}
+
+static const struct hdmi_codec_ops audio_codec_ops = {
+ .hw_params = audio_hw_params,
+ .audio_shutdown = audio_shutdown,
+ .mute_stream = audio_mute_stream,
+ .get_eld = audio_get_eld,
+ .hook_plugged_cb = audio_hook_plugged_cb,
+};
+
+static int snd_dw_hdmi_probe(struct platform_device *pdev)
+{
+ struct dw_hdmi_audio_data *data = pdev->dev.platform_data;
+ struct snd_dw_hdmi *dw;
+
+ const struct hdmi_codec_pdata codec_data = {
+ .i2s = 1,
+ .spdif = 0,
+ .ops = &audio_codec_ops,
+ .max_i2s_channels = 8,
+ .data = data,
+ };
+
+ dw = devm_kzalloc(&pdev->dev, sizeof(*dw), GFP_KERNEL);
+ if (!dw)
+ return -ENOMEM;
+
+ dw->data = *data;
+
+ platform_set_drvdata(pdev, dw);
+
+ dw->audio_pdev = platform_device_register_data(&pdev->dev,
+ HDMI_CODEC_DRV_NAME, 1,
+ &codec_data,
+ sizeof(codec_data));
+
+ return PTR_ERR_OR_ZERO(dw->audio_pdev);
+}
+
+static int snd_dw_hdmi_remove(struct platform_device *pdev)
+{
+ struct snd_dw_hdmi *dw = platform_get_drvdata(pdev);
+
+ platform_device_unregister(dw->audio_pdev);
+
+ return 0;
+}
+
+static struct platform_driver snd_dw_hdmi_driver = {
+ .probe = snd_dw_hdmi_probe,
+ .remove = snd_dw_hdmi_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ },
+};
+
+module_platform_driver(snd_dw_hdmi_driver);
+
+MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@xxxxxxx>");
+MODULE_DESCRIPTION("Synopsis Designware HDMI GPA ALSA interface");
Should be Synopsys
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRIVER_NAME);
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 13270d96e5be..2ebbe9fc5d7f 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -191,7 +191,10 @@ struct dw_hdmi {
spinlock_t audio_lock;
struct mutex audio_mutex;
+ unsigned int sample_non_pcm;
+ unsigned int sample_width;
unsigned int sample_rate;
+ unsigned int channels;
unsigned int audio_cts;
unsigned int audio_n;
bool audio_enable;
@@ -589,6 +592,8 @@ static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk)
n = 4096;
else if (pixel_clk == 74176000 || pixel_clk == 148352000)
n = 11648;
+ else if (pixel_clk == 297000000)
+ n = 3072;
else
n = 4096;
n *= mult;
@@ -601,6 +606,8 @@ static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk)
n = 17836;
else if (pixel_clk == 148352000)
n = 8918;
+ else if (pixel_clk == 297000000)
+ n = 4704;
else
n = 6272;
n *= mult;
@@ -615,6 +622,8 @@ static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk)
n = 11648;
else if (pixel_clk == 148352000)
n = 5824;
+ else if (pixel_clk == 297000000)
+ n = 5120;
else
n = 6144;
n *= mult;
@@ -660,7 +669,7 @@ static void hdmi_set_clk_regenerator(struct dw_hdmi *hdmi,
config3 = hdmi_readb(hdmi, HDMI_CONFIG3_ID);
/* Only compute CTS when using internal AHB audio */
Please update the comment to include GPAUD as I requested on V1.
- if (config3 & HDMI_CONFIG3_AHBAUDDMA) {
+ if ((config3 & HDMI_CONFIG3_AHBAUDDMA) || (config3 & HDMI_CONFIG3_GPAUD)) {
/*
* Compute the CTS value from the N value. Note that CTS and N
* can be up to 20 bits in total, so we need 64-bit math. Also
@@ -702,6 +711,22 @@ static void hdmi_clk_regenerator_update_pixel_clock(struct dw_hdmi *hdmi)
mutex_unlock(&hdmi->audio_mutex);
}
+void dw_hdmi_set_sample_width(struct dw_hdmi *hdmi, unsigned int width)
+{
+ mutex_lock(&hdmi->audio_mutex);
+ hdmi->sample_width = width;
+ mutex_unlock(&hdmi->audio_mutex);
+}
+EXPORT_SYMBOL_GPL(dw_hdmi_set_sample_width);
+
+void dw_hdmi_set_sample_non_pcm(struct dw_hdmi *hdmi, unsigned int non_pcm)
+{
+ mutex_lock(&hdmi->audio_mutex);
+ hdmi->sample_non_pcm = non_pcm;
+ mutex_unlock(&hdmi->audio_mutex);
+}
+EXPORT_SYMBOL_GPL(dw_hdmi_set_sample_non_pcm);
+
void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate)
{
mutex_lock(&hdmi->audio_mutex);
@@ -717,6 +742,7 @@ void dw_hdmi_set_channel_count(struct dw_hdmi *hdmi, unsigned int cnt)
u8 layout;
mutex_lock(&hdmi->audio_mutex);
+ hdmi->channels = cnt;
/*
* For >2 channel PCM audio, we need to select layout 1
@@ -765,6 +791,87 @@ static u8 *hdmi_audio_get_eld(struct dw_hdmi *hdmi)
return hdmi->curr_conn->eld;
}
+static void dw_hdmi_gp_audio_enable(struct dw_hdmi *hdmi)
+{
+ int sample_freq = 0x2, org_sample_freq = 0xD;
+ int ch_mask = BIT(hdmi->channels) - 1;
+
+ switch (hdmi->sample_rate) {
+ case 32000:
+ sample_freq = 0x03;
+ org_sample_freq = 0x0C;
+ break;
+ case 44100:
+ sample_freq = 0x00;
+ org_sample_freq = 0x0F;
+ break;
+ case 48000:
+ sample_freq = 0x02;
+ org_sample_freq = 0x0D;
+ break;
+ case 88200:
+ sample_freq = 0x08;
+ org_sample_freq = 0x07;
+ break;
+ case 96000:
+ sample_freq = 0x0A;
+ org_sample_freq = 0x05;
+ break;
+ case 176400:
+ sample_freq = 0x0C;
+ org_sample_freq = 0x03;
+ break;
+ case 192000:
+ sample_freq = 0x0E;
+ org_sample_freq = 0x01;
+ break;
+ default:
+ break;
+ }
+
+ hdmi_set_cts_n(hdmi, hdmi->audio_cts, hdmi->audio_n);
+ hdmi_enable_audio_clk(hdmi, true);
+
+ hdmi_writeb(hdmi, 0x1, HDMI_FC_AUDSCHNLS0);
+ hdmi_writeb(hdmi, hdmi->channels, HDMI_FC_AUDSCHNLS2);
+ hdmi_writeb(hdmi, 0x22, HDMI_FC_AUDSCHNLS3);
+ hdmi_writeb(hdmi, 0x22, HDMI_FC_AUDSCHNLS4);
+ hdmi_writeb(hdmi, 0x11, HDMI_FC_AUDSCHNLS5);
+ hdmi_writeb(hdmi, 0x11, HDMI_FC_AUDSCHNLS6);
+ hdmi_writeb(hdmi, (0x3 << 4) | sample_freq, HDMI_FC_AUDSCHNLS7);
+ hdmi_writeb(hdmi, (org_sample_freq << 4) | 0xb, HDMI_FC_AUDSCHNLS8);
+
+ hdmi_writeb(hdmi, ch_mask, HDMI_GP_CONF1);
+ hdmi_writeb(hdmi, 0x02, HDMI_GP_CONF2);
+ hdmi_writeb(hdmi, 0x01, HDMI_GP_CONF0);
+
+ hdmi_modb(hdmi, 0x3, 0x3, HDMI_FC_DATAUTO3);
+
+ /* hbr */
+ if (hdmi->sample_rate == 192000 && hdmi->channels == 8 &&
+ hdmi->sample_width == 32 && hdmi->sample_non_pcm) {
+ hdmi_modb(hdmi, 0x01, 0x01, HDMI_GP_CONF2);
+ }
You can drop the brackets here
+
+ if (hdmi->phy.ops->enable_audio)
+ hdmi->phy.ops->enable_audio(hdmi, hdmi->phy.data,
+ hdmi->channels,
+ hdmi->sample_width,
+ hdmi->sample_rate,
+ hdmi->sample_non_pcm);
Are this really PHY ops ? or glue ops ? it looks like it's the later.
Those should eventually go in dw_hdmi_plat_data.
Can you elaborate what is done in those callbacks ? can't you use alsa codecs events instead ?
+}
+
+static void dw_hdmi_gp_audio_disable(struct dw_hdmi *hdmi)
+{
+ hdmi_set_cts_n(hdmi, hdmi->audio_cts, 0);
+
+ hdmi_modb(hdmi, 0, 0x3, HDMI_FC_DATAUTO3);
+ if (hdmi->phy.ops->disable_audio)
+ hdmi->phy.ops->disable_audio(hdmi, hdmi->phy.data);
+
+ hdmi_enable_audio_clk(hdmi, false);
+}
+
static void dw_hdmi_ahb_audio_enable(struct dw_hdmi *hdmi)
{
hdmi_set_cts_n(hdmi, hdmi->audio_cts, hdmi->audio_n);
@@ -3253,6 +3360,7 @@ struct dw_hdmi *dw_hdmi_probe(struct platform_device *pdev,
hdmi->plat_data = plat_data;
hdmi->dev = dev;
hdmi->sample_rate = 48000;
+ hdmi->channels = 2;
hdmi->disabled = true;
hdmi->rxsense = true;
hdmi->phy_mask = (u8)~(HDMI_PHY_HPD | HDMI_PHY_RX_SENSE);
@@ -3476,6 +3584,24 @@ struct dw_hdmi *dw_hdmi_probe(struct platform_device *pdev,
pdevinfo.size_data = sizeof(audio);
pdevinfo.dma_mask = DMA_BIT_MASK(32);
hdmi->audio = platform_device_register_full(&pdevinfo);
+ } else if (iores && config3 & HDMI_CONFIG3_GPAUD) {
+ struct dw_hdmi_audio_data audio;
+
+ audio.phys = iores->start;
+ audio.base = hdmi->regs;
+ audio.irq = irq;
+ audio.hdmi = hdmi;
+ audio.get_eld = hdmi_audio_get_eld;
+
+ hdmi->enable_audio = dw_hdmi_gp_audio_enable;
+ hdmi->disable_audio = dw_hdmi_gp_audio_disable;
+
+ pdevinfo.name = "dw-hdmi-gp-audio";
+ pdevinfo.id = PLATFORM_DEVID_NONE;
+ pdevinfo.data = &audio;
+ pdevinfo.size_data = sizeof(audio);
+ pdevinfo.dma_mask = DMA_BIT_MASK(32);
+ hdmi->audio = platform_device_register_full(&pdevinfo);
}
if (!plat_data->disable_cec && (config0 & HDMI_CONFIG0_CEC)) {
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
index 1999db05bc3b..99aa1c03343b 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
@@ -158,8 +158,17 @@
#define HDMI_FC_SPDDEVICEINF 0x1062
#define HDMI_FC_AUDSCONF 0x1063
#define HDMI_FC_AUDSSTAT 0x1064
-#define HDMI_FC_AUDSCHNLS7 0x106e
-#define HDMI_FC_AUDSCHNLS8 0x106f
+#define HDMI_FC_AUDSV 0x1065
+#define HDMI_FC_AUDSU 0x1066
+#define HDMI_FC_AUDSCHNLS0 0x1067
+#define HDMI_FC_AUDSCHNLS1 0x1068
+#define HDMI_FC_AUDSCHNLS2 0x1069
+#define HDMI_FC_AUDSCHNLS3 0x106A
+#define HDMI_FC_AUDSCHNLS4 0x106B
+#define HDMI_FC_AUDSCHNLS5 0x106C
+#define HDMI_FC_AUDSCHNLS6 0x106D
+#define HDMI_FC_AUDSCHNLS7 0x106E
+#define HDMI_FC_AUDSCHNLS8 0x106F
#define HDMI_FC_DATACH0FILL 0x1070
#define HDMI_FC_DATACH1FILL 0x1071
#define HDMI_FC_DATACH2FILL 0x1072
diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
index 70082f80a8c8..7f73c3398a54 100644
--- a/include/drm/bridge/dw_hdmi.h
+++ b/include/drm/bridge/dw_hdmi.h
@@ -121,6 +121,9 @@ struct dw_hdmi_phy_ops {
void (*update_hpd)(struct dw_hdmi *hdmi, void *data,
bool force, bool disabled, bool rxsense);
void (*setup_hpd)(struct dw_hdmi *hdmi, void *data);
+ void (*enable_audio)(struct dw_hdmi *hdmi, void *data, int channel,
+ int width, int rate, int non_pcm);
+ void (*disable_audio)(struct dw_hdmi *hdmi, void *data);
};
struct dw_hdmi_plat_data {
@@ -173,6 +176,8 @@ void dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi, bool hpd, bool rx_sense);
int dw_hdmi_set_plugged_cb(struct dw_hdmi *hdmi, hdmi_codec_plugged_cb fn,
struct device *codec_dev);
+void dw_hdmi_set_sample_non_pcm(struct dw_hdmi *hdmi, unsigned int non_pcm);
+void dw_hdmi_set_sample_width(struct dw_hdmi *hdmi, unsigned int width);
void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate);
void dw_hdmi_set_channel_count(struct dw_hdmi *hdmi, unsigned int cnt);
void dw_hdmi_set_channel_status(struct dw_hdmi *hdmi, u8 *channel_status);