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Date: Wed, 6 Apr 2022 11:27:48 +0200
From: Neil Armstrong <narmstrong@...libre.com>
To: Sandor.yu@....com, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, andrzej.hajda@...el.com,
robert.foss@...aro.org, Laurent.pinchart@...asonboard.com,
jonas@...boo.se, jernej.skrabec@...il.com
Cc: shengjiu.wang@....com, cai.huoqing@...ux.dev, maxime@...no.tech,
harry.wentland@....com, hverkuil-cisco@...all.nl,
amuel@...lland.org
Subject: Re: [PATCH v1 5/5] drm: bridge: dw_hdmi: Audio: Add General Parallel
Audio (GPA) driver
Hi,
On 06/04/2022 10:48, Sandor.yu@....com wrote:
> From: Sandor Yu <Sandor.yu@....com>
>
> General Parallel Audio (GPA) interface is one of the supported
> audio interface for synopsys HDMI module, which has verified for
> i.MX8MP platform.
> This is initial version for GPA.
>
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> Signed-off-by: Sandor Yu <Sandor.yu@....com>
> ---
> drivers/gpu/drm/bridge/synopsys/Kconfig | 11 +
> 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, 354 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..e398b58c996d 100644
> --- a/drivers/gpu/drm/bridge/synopsys/Kconfig
> +++ b/drivers/gpu/drm/bridge/synopsys/Kconfig
> @@ -25,6 +25,17 @@ 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. This is used in conjunction with
> + the i.MX865 HDMI driver.
What does that mean ? it can only be used with i.MX865 HDMI driver ?
If not, remove reference to i.MX865 HDMI driver.
> +
> 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@....com>");
> +MODULE_DESCRIPTION("Synopsis Designware HDMI GPA ALSA interface");
> +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 c6e701acd416..1385d8f7870e 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 */
> - if (config3 & HDMI_CONFIG3_AHBAUDDMA) {
> + if ((config3 & HDMI_CONFIG3_AHBAUDDMA) || (config3 & HDMI_CONFIG3_GPAUD)) {
Update the comment to include 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);
> + }
> +
> + 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);
> +}
> +
> +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);
> @@ -3259,6 +3366,7 @@ 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);
> @@ -3482,6 +3590,24 @@ 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);
Thanks,
Neil
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