[PATCH v2 1/2] ASoC: Intel: KMB: Enable TDM audio capture
Sit, Michael Wei Hong
michael.wei.hong.sit at intel.com
Tue Aug 18 08:50:43 CEST 2020
> -----Original Message-----
> From: Alsa-devel <alsa-devel-bounces at alsa-project.org> On Behalf
> Of Michael Sit Wei Hong
> Sent: Tuesday, 11 August, 2020 12:19 PM
> To: alsa-devel at alsa-project.org
> Cc: Rojewski, Cezary <cezary.rojewski at intel.com>; Shevchenko,
> Andriy <andriy.shevchenko at intel.com>; tiwai at suse.com; Sia, Jee
> Heng <jee.heng.sia at intel.com>; pierre-
> louis.bossart at linux.intel.com; liam.r.girdwood at linux.intel.com;
> broonie at kernel.org
> Subject: [PATCH v2 1/2] ASoC: Intel: KMB: Enable TDM audio
> capture
>
> Enable I2S TDM audio capture for Intel Keem Bay platform.
> The I2S TDM will support 4 channel and 8 channel audio capture only.
> 4 channel and 8 channel audio capture operates only in slave mode.
>
> Signed-off-by: Michael Sit Wei Hong
> <michael.wei.hong.sit at intel.com>
> Reviewed-by: Sia Jee Heng <jee.heng.sia at intel.com>
> Reviewed-by: Pierre-Louis Bossart <pierre-
> louis.bossart at linux.intel.com>
> ---
> sound/soc/intel/keembay/kmb_platform.c | 145
> ++++++++++++++++++-------
> 1 file changed, 108 insertions(+), 37 deletions(-)
>
> diff --git a/sound/soc/intel/keembay/kmb_platform.c
> b/sound/soc/intel/keembay/kmb_platform.c
> index eaa4fd391171..09f49e1cda59 100644
> --- a/sound/soc/intel/keembay/kmb_platform.c
> +++ b/sound/soc/intel/keembay/kmb_platform.c
> @@ -8,6 +8,8 @@
> #include <linux/clk.h>
> #include <linux/io.h>
> #include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> #include <sound/pcm.h>
> #include <sound/pcm_params.h>
> #include <sound/soc.h>
> @@ -17,7 +19,7 @@
> #define PERIODS_MAX 48
> #define PERIOD_BYTES_MIN 4096
> #define BUFFER_BYTES_MAX (PERIODS_MAX *
> PERIOD_BYTES_MIN)
> -#define TDM_OPERATION 1
> +#define TDM_OPERATION 5
> #define I2S_OPERATION 0
> #define DATA_WIDTH_CONFIG_BIT 6
> #define TDM_CHANNEL_CONFIG_BIT 3
> @@ -82,19 +84,25 @@ static unsigned int kmb_pcm_rx_fn(struct
> kmb_i2s_info *kmb_i2s, {
> unsigned int period_pos = rx_ptr % runtime->period_size;
> void __iomem *i2s_base = kmb_i2s->i2s_base;
> + int chan = kmb_i2s->config.chan_nr;
> void *buf = runtime->dma_area;
> - int i;
> + int i, j;
>
> /* KMB i2s uses two separate L/R FIFO */
> for (i = 0; i < kmb_i2s->fifo_th; i++) {
> - if (kmb_i2s->config.data_width == 16) {
> - ((u16(*)[2])buf)[rx_ptr][0] = readl(i2s_base
> + LRBR_LTHR(0));
> - ((u16(*)[2])buf)[rx_ptr][1] = readl(i2s_base
> + RRBR_RTHR(0));
> - } else {
> - ((u32(*)[2])buf)[rx_ptr][0] = readl(i2s_base
> + LRBR_LTHR(0));
> - ((u32(*)[2])buf)[rx_ptr][1] = readl(i2s_base
> + RRBR_RTHR(0));
> + for (j = 0; j < chan / 2; j++) {
> + if (kmb_i2s->config.data_width == 16) {
> + ((u16 *)buf)[rx_ptr * chan + (j * 2)]
> =
> + readl(i2s_base +
> LRBR_LTHR(j));
> + ((u16 *)buf)[rx_ptr * chan + ((j * 2)
> + 1)] =
> + readl(i2s_base +
> RRBR_RTHR(j));
> + } else {
> + ((u32 *)buf)[rx_ptr * chan + (j * 2)]
> =
> + readl(i2s_base +
> LRBR_LTHR(j));
> + ((u32 *)buf)[rx_ptr * chan + ((j * 2)
> + 1)] =
> + readl(i2s_base +
> RRBR_RTHR(j));
> + }
> }
> -
> period_pos++;
>
> if (++rx_ptr >= runtime->buffer_size) @@ -238,6
> +246,7 @@ static irqreturn_t kmb_i2s_irq_handler(int irq, void
> *dev_id)
> struct kmb_i2s_info *kmb_i2s = dev_id;
> struct i2s_clk_config_data *config = &kmb_i2s->config;
> irqreturn_t ret = IRQ_NONE;
> + u32 tx_enabled = 0;
> u32 isr[4];
> int i;
>
> @@ -246,22 +255,45 @@ static irqreturn_t kmb_i2s_irq_handler(int
> irq, void *dev_id)
>
> kmb_i2s_clear_irqs(kmb_i2s,
> SNDRV_PCM_STREAM_PLAYBACK);
> kmb_i2s_clear_irqs(kmb_i2s,
> SNDRV_PCM_STREAM_CAPTURE);
> + /* Only check TX interrupt if TX is active */
> + tx_enabled = readl(kmb_i2s->i2s_base + ITER);
> +
> + /*
> + * Data available. Retrieve samples from FIFO
> + */
> +
> + /*
> + * 8 channel audio will have isr[0..2] triggered,
> + * reading the specific isr based on the audio configuration,
> + * to avoid reading the buffers too early.
> + */
> + switch (config->chan_nr) {
> + case 2:
> + if (isr[0] & ISR_RXDA)
> + kmb_pcm_operation(kmb_i2s, false);
> + ret = IRQ_HANDLED;
> + break;
> + case 4:
> + if (isr[1] & ISR_RXDA)
> + kmb_pcm_operation(kmb_i2s, false);
> + ret = IRQ_HANDLED;
> + break;
> + case 8:
> + if (isr[3] & ISR_RXDA)
> + kmb_pcm_operation(kmb_i2s, false);
> + ret = IRQ_HANDLED;
> + break;
> + }
>
> for (i = 0; i < config->chan_nr / 2; i++) {
> /*
> * Check if TX fifo is empty. If empty fill FIFO with
> samples
> */
> - if ((isr[i] & ISR_TXFE)) {
> + if ((isr[i] & ISR_TXFE) && tx_enabled) {
> kmb_pcm_operation(kmb_i2s, true);
> ret = IRQ_HANDLED;
> }
> - /*
> - * Data available. Retrieve samples from FIFO
> - */
> - if ((isr[i] & ISR_RXDA)) {
> - kmb_pcm_operation(kmb_i2s, false);
> - ret = IRQ_HANDLED;
> - }
> +
> /* Error Handling: TX */
> if (isr[i] & ISR_TXFO) {
> dev_dbg(kmb_i2s->dev, "TX overrun
> (ch_id=%d)\n", i); @@ -445,7 +477,7 @@ static int
> kmb_dai_hw_params(struct snd_pcm_substream *substream, {
> struct kmb_i2s_info *kmb_i2s =
> snd_soc_dai_get_drvdata(cpu_dai);
> struct i2s_clk_config_data *config = &kmb_i2s->config;
> - u32 register_val, write_val;
> + u32 write_val;
> int ret;
>
> switch (params_format(hw_params)) {
> @@ -472,16 +504,34 @@ static int kmb_dai_hw_params(struct
> snd_pcm_substream *substream,
> config->chan_nr = params_channels(hw_params);
>
> switch (config->chan_nr) {
> - /* TODO: This switch case will handle up to TDM8 in the
> near future */
> - case TWO_CHANNEL_SUPPORT:
> + case 8:
> + case 4:
> + /*
> + * Platform is not capable of providing clocks for
> + * multi channel audio
> + */
> + if (kmb_i2s->master)
> + return -EINVAL;
> +
> write_val = ((config->chan_nr / 2) <<
> TDM_CHANNEL_CONFIG_BIT) |
> (config->data_width <<
> DATA_WIDTH_CONFIG_BIT) |
> - MASTER_MODE | I2S_OPERATION;
> + !MASTER_MODE |
> TDM_OPERATION;
>
> writel(write_val, kmb_i2s->pss_base +
> I2S_GEN_CFG_0);
> + break;
> + case 2:
> + /*
> + * Platform is only capable of providing clocks need
> for
> + * 2 channel master mode
> + */
> + if (!(kmb_i2s->master))
> + return -EINVAL;
> +
> + write_val = ((config->chan_nr / 2) <<
> TDM_CHANNEL_CONFIG_BIT) |
> + (config->data_width <<
> DATA_WIDTH_CONFIG_BIT) |
> + MASTER_MODE | I2S_OPERATION;
>
> - register_val = readl(kmb_i2s->pss_base +
> I2S_GEN_CFG_0);
> - dev_dbg(kmb_i2s->dev, "pss register = 0x%X",
> register_val);
> + writel(write_val, kmb_i2s->pss_base +
> I2S_GEN_CFG_0);
> break;
> default:
> dev_dbg(kmb_i2s->dev, "channel not supported\n");
> @@ -529,9 +579,9 @@ static struct snd_soc_dai_ops kmb_dai_ops
> = {
> .set_fmt = kmb_set_dai_fmt,
> };
>
> -static struct snd_soc_dai_driver intel_kmb_platform_dai[] = {
> +static struct snd_soc_dai_driver intel_kmb_i2s_dai[] = {
> {
> - .name = "kmb-plat-dai",
> + .name = "intel_kmb_i2s",
> .playback = {
> .channels_min = 2,
> .channels_max = 2,
> @@ -547,10 +597,6 @@ static struct snd_soc_dai_driver
> intel_kmb_platform_dai[] = {
> .capture = {
> .channels_min = 2,
> .channels_max = 2,
> - /*
> - * .channels_max will be overwritten
> - * if provided by Device Tree
> - */
> .rates = SNDRV_PCM_RATE_8000 |
> SNDRV_PCM_RATE_16000 |
> SNDRV_PCM_RATE_48000,
> @@ -564,9 +610,35 @@ static struct snd_soc_dai_driver
> intel_kmb_platform_dai[] = {
> },
> };
>
> +static struct snd_soc_dai_driver intel_kmb_tdm_dai[] = {
> + {
> + .name = "intel_kmb_tdm",
> + .capture = {
> + .channels_min = 4,
> + .channels_max = 8,
> + .rates = SNDRV_PCM_RATE_8000 |
> + SNDRV_PCM_RATE_16000 |
> + SNDRV_PCM_RATE_48000,
> + .rate_min = 8000,
> + .rate_max = 48000,
> + .formats = (SNDRV_PCM_FMTBIT_S32_LE |
> + SNDRV_PCM_FMTBIT_S24_LE |
> + SNDRV_PCM_FMTBIT_S16_LE),
> + },
> + .ops = &kmb_dai_ops,
> + },
> +};
> +
> +static const struct of_device_id kmb_plat_of_match[] = {
> + { .compatible = "intel,keembay-i2s", .data =
> &intel_kmb_i2s_dai},
> + { .compatible = "intel,keembay-tdm", .data =
> &intel_kmb_tdm_dai},
> + {}
> +};
> +
> static int kmb_plat_dai_probe(struct platform_device *pdev) {
> struct snd_soc_dai_driver *kmb_i2s_dai;
> + const struct of_device_id *match;
> struct device *dev = &pdev->dev;
> struct kmb_i2s_info *kmb_i2s;
> int ret, irq;
> @@ -580,7 +652,12 @@ static int kmb_plat_dai_probe(struct
> platform_device *pdev)
> if (!kmb_i2s_dai)
> return -ENOMEM;
>
> - kmb_i2s_dai->ops = &kmb_dai_ops;
> + match = of_match_device(kmb_plat_of_match, &pdev-
> >dev);
> + if (!match) {
> + dev_err(&pdev->dev, "Error: No device match
> found\n");
> + return -ENODEV;
> + }
> + kmb_i2s_dai = (struct snd_soc_dai_driver *) match->data;
>
> /* Prepare the related clocks */
> kmb_i2s->clk_apb = devm_clk_get(dev, "apb_clk"); @@ -
> 630,8 +707,7 @@ static int kmb_plat_dai_probe(struct
> platform_device *pdev)
> kmb_i2s->fifo_th = (1 << COMP1_FIFO_DEPTH(comp1_reg))
> / 2;
>
> ret = devm_snd_soc_register_component(dev,
> &kmb_component,
> - intel_kmb_platform_dai,
> -
> ARRAY_SIZE(intel_kmb_platform_dai));
> + kmb_i2s_dai, 1);
> if (ret) {
> dev_err(dev, "not able to register dai\n");
> return ret;
> @@ -646,11 +722,6 @@ static int kmb_plat_dai_probe(struct
> platform_device *pdev)
> return ret;
> }
>
> -static const struct of_device_id kmb_plat_of_match[] = {
> - { .compatible = "intel,keembay-i2s", },
> - {}
> -};
> -
> static struct platform_driver kmb_plat_dai_driver = {
> .driver = {
> .name = "kmb-plat-dai",
> --
> 2.17.1
Hi everyone,
Is there anymore comments on this patch set?
Thanks,
Regards,
Michael
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