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SubjectRe: [PATCH v2 05/10] media: adv748x: add support for HDMI audio
Hi Alex,

CC linux-clk for the clock provider.

On Thu, Mar 19, 2020 at 6:42 PM Alex Riesen
<alexander.riesen@cetitec.com> wrote:
> This adds an implemention of SoC DAI driver which provides access to the
> I2S port of the device.
>
> Signed-off-by: Alexander Riesen <alexander.riesen@cetitec.com>

Thanks for your patch!

One comment below.

> ---
> drivers/media/i2c/adv748x/Makefile | 3 +-
> drivers/media/i2c/adv748x/adv748x-core.c | 9 +-
> drivers/media/i2c/adv748x/adv748x-dai.c | 256 +++++++++++++++++++++++
> drivers/media/i2c/adv748x/adv748x.h | 16 +-
> 4 files changed, 281 insertions(+), 3 deletions(-)
> create mode 100644 drivers/media/i2c/adv748x/adv748x-dai.c
>
> diff --git a/drivers/media/i2c/adv748x/Makefile b/drivers/media/i2c/adv748x/Makefile
> index 93844f14cb10..6e7a302ef199 100644
> --- a/drivers/media/i2c/adv748x/Makefile
> +++ b/drivers/media/i2c/adv748x/Makefile
> @@ -3,6 +3,7 @@ adv748x-objs := \
> adv748x-afe.o \
> adv748x-core.o \
> adv748x-csi2.o \
> - adv748x-hdmi.o
> + adv748x-hdmi.o \
> + adv748x-dai.o
>
> obj-$(CONFIG_VIDEO_ADV748X) += adv748x.o
> diff --git a/drivers/media/i2c/adv748x/adv748x-core.c b/drivers/media/i2c/adv748x/adv748x-core.c
> index 36164a254d7b..2c0bd58038e6 100644
> --- a/drivers/media/i2c/adv748x/adv748x-core.c
> +++ b/drivers/media/i2c/adv748x/adv748x-core.c
> @@ -765,8 +765,14 @@ static int adv748x_probe(struct i2c_client *client)
> goto err_cleanup_txa;
> }
>
> + ret = adv748x_dai_init(&state->dai);
> + if (ret) {
> + adv_err(state, "Failed to probe DAI\n");
> + goto err_cleanup_txb;
> + }
> return 0;
> -
> +err_cleanup_txb:
> + adv748x_csi2_cleanup(&state->txb);
> err_cleanup_txa:
> adv748x_csi2_cleanup(&state->txa);
> err_cleanup_afe:
> @@ -787,6 +793,7 @@ static int adv748x_remove(struct i2c_client *client)
> {
> struct adv748x_state *state = i2c_get_clientdata(client);
>
> + adv748x_dai_cleanup(&state->dai);
> adv748x_afe_cleanup(&state->afe);
> adv748x_hdmi_cleanup(&state->hdmi);
>
> diff --git a/drivers/media/i2c/adv748x/adv748x-dai.c b/drivers/media/i2c/adv748x/adv748x-dai.c
> new file mode 100644
> index 000000000000..4775a0c7ed7f
> --- /dev/null
> +++ b/drivers/media/i2c/adv748x/adv748x-dai.c
> @@ -0,0 +1,256 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Driver for Analog Devices ADV748X HDMI receiver with AFE
> + * The implementation of DAI.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +#include <sound/pcm_params.h>
> +
> +#include "adv748x.h"
> +
> +#define state_of(soc_dai) \
> + adv748x_dai_to_state(container_of((soc_dai)->driver, \
> + struct adv748x_dai, \
> + drv))
> +
> +static const char ADV748X_DAI_NAME[] = "adv748x-i2s";
> +
> +static int set_audio_pads_state(struct adv748x_state *state, int on)
> +{
> + return io_update(state, ADV748X_IO_PAD_CONTROLS,
> + ADV748X_IO_PAD_CONTROLS_TRI_AUD |
> + ADV748X_IO_PAD_CONTROLS_PDN_AUD,
> + on ? 0 : 0xff);
> +}
> +
> +static int set_dpll_mclk_fs(struct adv748x_state *state, int fs)
> +{
> + return dpll_update(state, ADV748X_DPLL_MCLK_FS,
> + ADV748X_DPLL_MCLK_FS_N_MASK, (fs / 128) - 1);
> +}
> +
> +static int set_i2s_format(struct adv748x_state *state, uint outmode,
> + uint bitwidth)
> +{
> + return hdmi_update(state, ADV748X_HDMI_I2S,
> + ADV748X_HDMI_I2SBITWIDTH_MASK |
> + ADV748X_HDMI_I2SOUTMODE_MASK,
> + (outmode << ADV748X_HDMI_I2SOUTMODE_SHIFT) |
> + bitwidth);
> +}
> +
> +static int set_i2s_tdm_mode(struct adv748x_state *state, int is_tdm)
> +{
> + int ret;
> +
> + ret = hdmi_update(state, ADV748X_HDMI_AUDIO_MUTE_SPEED,
> + ADV748X_MAN_AUDIO_DL_BYPASS |
> + ADV748X_AUDIO_DELAY_LINE_BYPASS,
> + is_tdm ? 0xff : 0);
> + if (ret < 0)
> + return ret;
> + ret = hdmi_update(state, ADV748X_HDMI_REG_6D,
> + ADV748X_I2S_TDM_MODE_ENABLE,
> + is_tdm ? 0xff : 0);
> + return ret;
> +}
> +
> +static int set_audio_mute(struct adv748x_state *state, int enable)
> +{
> + return hdmi_update(state, ADV748X_HDMI_MUTE_CTRL,
> + ADV748X_HDMI_MUTE_CTRL_MUTE_AUDIO,
> + enable ? 0xff : 0);
> +}
> +
> +static int adv748x_dai_set_sysclk(struct snd_soc_dai *dai,
> + int clk_id, unsigned int freq, int dir)
> +{
> + struct adv748x_state *state = state_of(dai);
> +
> + /* currently supporting only one fixed rate clock */
> + if (clk_id != 0 || freq != clk_get_rate(state->dai.mclk)) {
> + dev_err(dai->dev, "invalid clock (%d) or frequency (%u, dir %d)\n",
> + clk_id, freq, dir);
> + return -EINVAL;
> + }
> + state->dai.freq = freq;
> + return 0;
> +}
> +
> +static int adv748x_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
> +{
> + struct adv748x_state *state = state_of(dai);
> + int ret = 0;
> +
> + if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBM_CFM) {
> + dev_err(dai->dev, "only I2S master clock mode supported\n");
> + ret = -EINVAL;
> + goto done;
> + }
> + switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
> + case SND_SOC_DAI_FORMAT_I2S:
> + state->dai.tdm = 0;
> + state->dai.fmt = ADV748X_I2SOUTMODE_I2S;
> + break;
> + case SND_SOC_DAI_FORMAT_RIGHT_J:
> + state->dai.tdm = 1;
> + state->dai.fmt = ADV748X_I2SOUTMODE_RIGHT_J;
> + break;
> + case SND_SOC_DAI_FORMAT_LEFT_J:
> + state->dai.tdm = 1;
> + state->dai.fmt = ADV748X_I2SOUTMODE_LEFT_J;
> + break;
> + default:
> + dev_err(dai->dev, "only i2s, left_j and right_j supported\n");
> + ret = -EINVAL;
> + goto done;
> + }
> + if ((fmt & SND_SOC_DAIFMT_INV_MASK) != SND_SOC_DAIFMT_NB_NF) {
> + dev_err(dai->dev, "only normal bit clock + frame supported\n");
> + ret = -EINVAL;
> + }
> +done:
> + return ret;
> +}
> +
> +static int adv748x_dai_startup(struct snd_pcm_substream *sub, struct snd_soc_dai *dai)
> +{
> + struct adv748x_state *state = state_of(dai);
> +
> + if (sub->stream != SNDRV_PCM_STREAM_CAPTURE)
> + return -EINVAL;
> + return set_audio_pads_state(state, 1);
> +}
> +
> +static int adv748x_dai_hw_params(struct snd_pcm_substream *sub,
> + struct snd_pcm_hw_params *params,
> + struct snd_soc_dai *dai)
> +{
> + int ret;
> + struct adv748x_state *state = state_of(dai);
> + uint fs = state->dai.freq / params_rate(params);
> +
> + dev_dbg(dai->dev, "dai %s substream %s rate=%u (fs=%u), channels=%u sample width=%u(%u)\n",
> + dai->name, sub->name,
> + params_rate(params), fs,
> + params_channels(params),
> + params_width(params),
> + params_physical_width(params));
> + switch (fs) {
> + case 128:
> + case 256:
> + case 384:
> + case 512:
> + case 640:
> + case 768:
> + break;
> + default:
> + ret = -EINVAL;
> + dev_err(dai->dev, "invalid clock frequency (%u) or rate (%u)\n",
> + state->dai.freq, params_rate(params));
> + goto done;
> + }
> + ret = set_dpll_mclk_fs(state, fs);
> + if (ret)
> + goto done;
> + ret = set_i2s_tdm_mode(state, state->dai.tdm);
> + if (ret)
> + goto done;
> + ret = set_i2s_format(state, state->dai.fmt, params_width(params));
> +done:
> + return ret;
> +}
> +
> +static int adv748x_dai_mute_stream(struct snd_soc_dai *dai, int mute, int dir)
> +{
> + struct adv748x_state *state = state_of(dai);
> +
> + return set_audio_mute(state, mute);
> +}
> +
> +static void adv748x_dai_shutdown(struct snd_pcm_substream *sub, struct snd_soc_dai *dai)
> +{
> + struct adv748x_state *state = state_of(dai);
> +
> + set_audio_pads_state(state, 0);
> +}
> +
> +static const struct snd_soc_dai_ops adv748x_dai_ops = {
> + .set_sysclk = adv748x_dai_set_sysclk,
> + .set_fmt = adv748x_dai_set_fmt,
> + .startup = adv748x_dai_startup,
> + .hw_params = adv748x_dai_hw_params,
> + .mute_stream = adv748x_dai_mute_stream,
> + .shutdown = adv748x_dai_shutdown,
> +};
> +
> +static int adv748x_of_xlate_dai_name(struct snd_soc_component *component,
> + struct of_phandle_args *args,
> + const char **dai_name)
> +{
> + if (dai_name)
> + *dai_name = ADV748X_DAI_NAME;
> + return 0;
> +}
> +
> +static const struct snd_soc_component_driver adv748x_codec = {
> + .of_xlate_dai_name = adv748x_of_xlate_dai_name,
> +};
> +
> +int adv748x_dai_init(struct adv748x_dai *dai)
> +{
> + int ret;
> + struct adv748x_state *state = adv748x_dai_to_state(dai);
> +
> + dai->mclk = clk_register_fixed_rate(state->dev,
> + "adv748x-hdmi-i2s-mclk",

I assume there can be multiple adv748x instances in the system?
Hence the clock name should be unique for each instance.

> + NULL /* parent_name */,
> + 0 /* flags */,
> + 12288000 /* rate */);
> + if (IS_ERR_OR_NULL(dai->mclk)) {
> + ret = PTR_ERR(dai->mclk);
> + adv_err(state, "Failed to register MCLK (%d)\n", ret);
> + goto fail;
> + }
> + ret = of_clk_add_provider(state->dev->of_node, of_clk_src_simple_get,
> + dai->mclk);
> + if (ret < 0) {
> + adv_err(state, "Failed to add MCLK provider (%d)\n", ret);
> + goto unreg_mclk;
> + }
> + dai->drv.name = ADV748X_DAI_NAME;
> + dai->drv.ops = &adv748x_dai_ops;
> + dai->drv.capture = (struct snd_soc_pcm_stream){
> + .stream_name = "Capture",
> + .channels_min = 8,
> + .channels_max = 8,
> + .rates = SNDRV_PCM_RATE_48000,
> + .formats = SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_U24_LE,
> + };
> +
> + ret = devm_snd_soc_register_component(state->dev, &adv748x_codec,
> + &dai->drv, 1);
> + if (ret < 0) {
> + adv_err(state, "Failed to register the codec (%d)\n", ret);
> + goto cleanup_mclk;
> + }
> + return 0;
> +
> +cleanup_mclk:
> + of_clk_del_provider(state->dev->of_node);
> +unreg_mclk:
> + clk_unregister_fixed_rate(dai->mclk);
> +fail:
> + return ret;
> +}
> +
> +void adv748x_dai_cleanup(struct adv748x_dai *dai)
> +{
> + struct adv748x_state *state = adv748x_dai_to_state(dai);
> +
> + of_clk_del_provider(state->dev->of_node);
> + clk_unregister_fixed_rate(dai->mclk);
> +}
> +
> diff --git a/drivers/media/i2c/adv748x/adv748x.h b/drivers/media/i2c/adv748x/adv748x.h
> index 7bc1bb0b3756..af70632926b5 100644
> --- a/drivers/media/i2c/adv748x/adv748x.h
> +++ b/drivers/media/i2c/adv748x/adv748x.h
> @@ -19,6 +19,7 @@
> */
>
> #include <linux/i2c.h>
> +#include <sound/soc.h>
> #include <media/v4l2-ctrls.h>
> #include <media/v4l2-device.h>
>
> @@ -63,7 +64,8 @@ enum adv748x_ports {
> ADV748X_PORT_TTL = 9,
> ADV748X_PORT_TXA = 10,
> ADV748X_PORT_TXB = 11,
> - ADV748X_PORT_MAX = 12,
> + ADV748X_PORT_I2S = 12,
> + ADV748X_PORT_MAX = 13,
> };
>
> enum adv748x_csi2_pads {
> @@ -166,6 +168,12 @@ struct adv748x_afe {
> container_of(ctrl->handler, struct adv748x_afe, ctrl_hdl)
> #define adv748x_sd_to_afe(sd) container_of(sd, struct adv748x_afe, sd)
>
> +struct adv748x_dai {
> + struct snd_soc_dai_driver drv;
> + struct clk *mclk;
> + unsigned int freq, fmt, tdm;
> +};
> +
> /**
> * struct adv748x_state - State of ADV748X
> * @dev: (OF) device
> @@ -182,6 +190,7 @@ struct adv748x_afe {
> * @afe: state of AFE receiver context
> * @txa: state of TXA transmitter context
> * @txb: state of TXB transmitter context
> + * @mclk: MCLK clock of the I2S port
> */
> struct adv748x_state {
> struct device *dev;
> @@ -197,10 +206,12 @@ struct adv748x_state {
> struct adv748x_afe afe;
> struct adv748x_csi2 txa;
> struct adv748x_csi2 txb;
> + struct adv748x_dai dai;
> };
>
> #define adv748x_hdmi_to_state(h) container_of(h, struct adv748x_state, hdmi)
> #define adv748x_afe_to_state(a) container_of(a, struct adv748x_state, afe)
> +#define adv748x_dai_to_state(p) container_of(p, struct adv748x_state, dai)
>
> #define adv_err(a, fmt, arg...) dev_err(a->dev, fmt, ##arg)
> #define adv_info(a, fmt, arg...) dev_info(a->dev, fmt, ##arg)
> @@ -485,4 +496,7 @@ int adv748x_csi2_set_pixelrate(struct v4l2_subdev *sd, s64 rate);
> int adv748x_hdmi_init(struct adv748x_hdmi *hdmi);
> void adv748x_hdmi_cleanup(struct adv748x_hdmi *hdmi);
>
> +int adv748x_dai_init(struct adv748x_dai *);
> +void adv748x_dai_cleanup(struct adv748x_dai *);
> +
> #endif /* _ADV748X_H_ */
> --
> 2.25.1.25.g9ecbe7eb18

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds

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