[alsa-devel] [RFC PATCH] drm: msm: Add ASoC generic hdmi audio codec support.
Jyri Sarha
jsarha at ti.com
Mon Jun 6 14:23:08 CEST 2016
On 06/03/16 16:56, Srinivas Kandagatla wrote:
> This patch adds support to generic audio codec via
> ASoC hdmi-codec infrastucture which is merged recently.
>
I know nothing about msm HW, but from the hdmi-codec point of view this
looks like a correct usage. However, the hdmi-codec could probably do
more to connect the hdmi audio infoframe's channel allocation field and
ALSA's channel mapping API together.
There looks to be a bug in selecting 44100 sample rate bellow.
BR,
Jyri
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla at linaro.org>
> ---
> drivers/gpu/drm/msm/Kconfig | 1 +
> drivers/gpu/drm/msm/hdmi/hdmi.c | 120 +++++++++++++++++++++++++++++++++++++++-
> drivers/gpu/drm/msm/hdmi/hdmi.h | 14 +++++
> 3 files changed, 134 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/msm/Kconfig b/drivers/gpu/drm/msm/Kconfig
> index 167a497..7c7a031 100644
> --- a/drivers/gpu/drm/msm/Kconfig
> +++ b/drivers/gpu/drm/msm/Kconfig
> @@ -10,6 +10,7 @@ config DRM_MSM
> select SHMEM
> select TMPFS
> select QCOM_SCM
> + select SND_SOC_HDMI_CODEC if SND_SOC
> default y
> help
> DRM/KMS driver for MSM/snapdragon.
> diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c
> index 51b9ea5..3281496 100644
> --- a/drivers/gpu/drm/msm/hdmi/hdmi.c
> +++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
> @@ -19,6 +19,7 @@
> #include <linux/of_irq.h>
> #include <linux/of_gpio.h>
>
> +#include <sound/hdmi-codec.h>
> #include "hdmi.h"
>
> void msm_hdmi_set_mode(struct hdmi *hdmi, bool power_on)
> @@ -434,6 +435,114 @@ static int msm_hdmi_get_gpio(struct device_node *of_node, const char *name)
> return gpio;
> }
>
> +/*
> + * HDMI audio codec callbacks
> + */
> +static int msm_hdmi_audio_hw_params(struct device *dev,
> + struct hdmi_codec_daifmt *daifmt,
> + struct hdmi_codec_params *params)
> +{
> + struct hdmi *hdmi = dev_get_drvdata(dev);
> + unsigned int chan;
> + unsigned int channel_allocation = 0;
> + unsigned int rate;
> + unsigned int level_shift = 0; /* 0dB */
> + bool down_mix = false;
> +
> + dev_dbg(dev, "%u Hz, %d bit, %d channels\n", params->sample_rate,
> + params->sample_width, params->cea.channels);
> +
> + switch (params->cea.channels) {
> + case 2:
> + /* FR and FL speakers */
> + channel_allocation = 0;
> + chan = MSM_HDMI_AUDIO_CHANNEL_2;
> + break;
> + case 4:
> + /* FC, LFE, FR and FL speakers */
> + channel_allocation = 0x3;
> + chan = MSM_HDMI_AUDIO_CHANNEL_4;
> + break;
> + case 6:
> + /* RR, RL, FC, LFE, FR and FL speakers */
> + channel_allocation = 0x0B;
> + chan = MSM_HDMI_AUDIO_CHANNEL_6;
> + break;
> + case 8:
> + /* FRC, FLC, RR, RL, FC, LFE, FR and FL speakers */
> + channel_allocation = 0x1F;
> + chan = MSM_HDMI_AUDIO_CHANNEL_8;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + switch (params->sample_rate) {
> + case 32000:
> + rate = HDMI_SAMPLE_RATE_32KHZ;
> + break;
> + case 44100:
> + rate = HDMI_SAMPLE_RATE_48KHZ;
> + break;
This looks like a bug...
> + case 48000:
> + rate = HDMI_SAMPLE_RATE_48KHZ;
> + break;
> + case 88200:
> + rate = HDMI_SAMPLE_RATE_88_2KHZ;
> + break;
> + case 96000:
> + rate = HDMI_SAMPLE_RATE_96KHZ;
> + break;
> + case 176400:
> + rate = HDMI_SAMPLE_RATE_176_4KHZ;
> + break;
> + case 192000:
> + rate = HDMI_SAMPLE_RATE_192KHZ;
> + break;
> + default:
> + dev_err(dev, "rate[%d] not supported!\n",
> + params->sample_rate);
> + return -EINVAL;
> + }
> +
> + msm_hdmi_audio_set_sample_rate(hdmi, rate);
> + msm_hdmi_audio_info_setup(hdmi, 1, chan, channel_allocation,
> + level_shift, down_mix);
> +
> + return 0;
> +}
> +
> +static void msm_hdmi_audio_shutdown(struct device *dev)
> +{
> + struct hdmi *hdmi = dev_get_drvdata(dev);
> +
> + msm_hdmi_audio_info_setup(hdmi, 0, 0, 0, 0, 0);
> +}
> +
> +static const struct hdmi_codec_ops msm_hdmi_audio_codec_ops = {
> + .hw_params = msm_hdmi_audio_hw_params,
> + .audio_shutdown = msm_hdmi_audio_shutdown,
> +};
> +
> +static struct hdmi_codec_pdata codec_data = {
> + .ops = &msm_hdmi_audio_codec_ops,
> + .max_i2s_channels = 8,
> + .i2s = 1,
> +};
> +
> +static int msm_hdmi_register_audio_driver(struct hdmi *hdmi, struct device *dev)
> +{
> + hdmi->audio_pdev = platform_device_register_data(dev,
> + HDMI_CODEC_DRV_NAME,
> + PLATFORM_DEVID_AUTO,
> + &codec_data,
> + sizeof(codec_data));
> + if (IS_ERR(hdmi->audio_pdev))
> + return PTR_ERR(hdmi->audio_pdev);
> +
> + return 0;
> +}
> +
> static int msm_hdmi_bind(struct device *dev, struct device *master, void *data)
> {
> struct drm_device *drm = dev_get_drvdata(master);
> @@ -441,7 +550,7 @@ static int msm_hdmi_bind(struct device *dev, struct device *master, void *data)
> static struct hdmi_platform_config *hdmi_cfg;
> struct hdmi *hdmi;
> struct device_node *of_node = dev->of_node;
> - int i;
> + int i, err;
>
> hdmi_cfg = (struct hdmi_platform_config *)
> of_device_get_match_data(dev);
> @@ -468,6 +577,12 @@ static int msm_hdmi_bind(struct device *dev, struct device *master, void *data)
> return PTR_ERR(hdmi);
> priv->hdmi = hdmi;
>
> + err = msm_hdmi_register_audio_driver(hdmi, dev);
> + if (err) {
> + DRM_ERROR("Failed to attach an audio codec %d\n", err);
> + hdmi->audio_pdev = NULL;
> + }
> +
> return 0;
> }
>
> @@ -477,6 +592,9 @@ static void msm_hdmi_unbind(struct device *dev, struct device *master,
> struct drm_device *drm = dev_get_drvdata(master);
> struct msm_drm_private *priv = drm->dev_private;
> if (priv->hdmi) {
> + if (priv->hdmi->audio_pdev)
> + platform_device_unregister(priv->hdmi->audio_pdev);
> +
> msm_hdmi_destroy(priv->hdmi);
> priv->hdmi = NULL;
> }
> diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.h b/drivers/gpu/drm/msm/hdmi/hdmi.h
> index bc7ba0b..accc9a6 100644
> --- a/drivers/gpu/drm/msm/hdmi/hdmi.h
> +++ b/drivers/gpu/drm/msm/hdmi/hdmi.h
> @@ -50,6 +50,7 @@ struct hdmi_hdcp_ctrl;
> struct hdmi {
> struct drm_device *dev;
> struct platform_device *pdev;
> + struct platform_device *audio_pdev;
>
> const struct hdmi_platform_config *config;
>
> @@ -210,6 +211,19 @@ static inline int msm_hdmi_pll_8996_init(struct platform_device *pdev)
> /*
> * audio:
> */
> +/* Supported HDMI Audio channels and rates */
> +#define MSM_HDMI_AUDIO_CHANNEL_2 0
> +#define MSM_HDMI_AUDIO_CHANNEL_4 1
> +#define MSM_HDMI_AUDIO_CHANNEL_6 2
> +#define MSM_HDMI_AUDIO_CHANNEL_8 3
> +
> +#define HDMI_SAMPLE_RATE_32KHZ 0
> +#define HDMI_SAMPLE_RATE_44_1KHZ 1
> +#define HDMI_SAMPLE_RATE_48KHZ 2
> +#define HDMI_SAMPLE_RATE_88_2KHZ 3
> +#define HDMI_SAMPLE_RATE_96KHZ 4
> +#define HDMI_SAMPLE_RATE_176_4KHZ 5
> +#define HDMI_SAMPLE_RATE_192KHZ 6
>
> int msm_hdmi_audio_update(struct hdmi *hdmi);
> int msm_hdmi_audio_info_setup(struct hdmi *hdmi, bool enabled,
>
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