ASRC can be used on memory to memory case, define several
functions for m2m usage and export them as function pointer.

Signed-off-by: Shengjiu Wang <shengjiu.w...@nxp.com>
Acked-by: Mark Brown <broo...@kernel.org>
---
 sound/soc/fsl/fsl_easrc.c | 214 ++++++++++++++++++++++++++++++++++++++
 sound/soc/fsl/fsl_easrc.h |   4 +
 2 files changed, 218 insertions(+)

diff --git a/sound/soc/fsl/fsl_easrc.c b/sound/soc/fsl/fsl_easrc.c
index ec53bda46a46..cf7ad30a323b 100644
--- a/sound/soc/fsl/fsl_easrc.c
+++ b/sound/soc/fsl/fsl_easrc.c
@@ -1861,6 +1861,211 @@ static int fsl_easrc_get_fifo_addr(u8 dir, enum 
asrc_pair_index index)
        return REG_EASRC_FIFO(dir, index);
 }
 
+/* Get sample numbers in FIFO */
+static unsigned int fsl_easrc_get_output_fifo_size(struct fsl_asrc_pair *pair)
+{
+       struct fsl_asrc *asrc = pair->asrc;
+       enum asrc_pair_index index = pair->index;
+       u32 val;
+
+       regmap_read(asrc->regmap, REG_EASRC_SFS(index), &val);
+       val &= EASRC_SFS_NSGO_MASK;
+
+       return val >> EASRC_SFS_NSGO_SHIFT;
+}
+
+static int fsl_easrc_m2m_prepare(struct fsl_asrc_pair *pair)
+{
+       struct fsl_easrc_ctx_priv *ctx_priv = pair->private;
+       struct fsl_asrc *asrc = pair->asrc;
+       struct device *dev = &asrc->pdev->dev;
+       int ret;
+
+       ctx_priv->in_params.sample_rate = pair->rate[IN];
+       ctx_priv->in_params.sample_format = pair->sample_format[IN];
+       ctx_priv->out_params.sample_rate = pair->rate[OUT];
+       ctx_priv->out_params.sample_format = pair->sample_format[OUT];
+
+       ctx_priv->in_params.fifo_wtmk = FSL_EASRC_INPUTFIFO_WML;
+       ctx_priv->out_params.fifo_wtmk = FSL_EASRC_OUTPUTFIFO_WML;
+       /* Fill the right half of the re-sampler with zeros */
+       ctx_priv->rs_init_mode = 0x2;
+       /* Zero fill the right half of the prefilter */
+       ctx_priv->pf_init_mode = 0x2;
+
+       ret = fsl_easrc_set_ctx_format(pair,
+                                      &ctx_priv->in_params.sample_format,
+                                      &ctx_priv->out_params.sample_format);
+       if (ret) {
+               dev_err(dev, "failed to set context format: %d\n", ret);
+               return ret;
+       }
+
+       ret = fsl_easrc_config_context(asrc, pair->index);
+       if (ret) {
+               dev_err(dev, "failed to config context %d\n", ret);
+               return ret;
+       }
+
+       ctx_priv->in_params.iterations = 1;
+       ctx_priv->in_params.group_len = pair->channels;
+       ctx_priv->in_params.access_len = pair->channels;
+       ctx_priv->out_params.iterations = 1;
+       ctx_priv->out_params.group_len = pair->channels;
+       ctx_priv->out_params.access_len = pair->channels;
+
+       ret = fsl_easrc_set_ctx_organziation(pair);
+       if (ret) {
+               dev_err(dev, "failed to set fifo organization\n");
+               return ret;
+       }
+
+       /* The context start flag */
+       pair->first_convert = 1;
+       return 0;
+}
+
+static int fsl_easrc_m2m_start(struct fsl_asrc_pair *pair)
+{
+       /* start context once */
+       if (pair->first_convert) {
+               fsl_easrc_start_context(pair);
+               pair->first_convert = 0;
+       }
+
+       return 0;
+}
+
+static int fsl_easrc_m2m_stop(struct fsl_asrc_pair *pair)
+{
+       /* Stop pair/context */
+       if (!pair->first_convert) {
+               fsl_easrc_stop_context(pair);
+               pair->first_convert = 1;
+       }
+
+       return 0;
+}
+
+/* calculate capture data length according to output data length and sample 
rate */
+static int fsl_easrc_m2m_calc_out_len(struct fsl_asrc_pair *pair, int 
input_buffer_length)
+{
+       struct fsl_asrc *easrc = pair->asrc;
+       struct fsl_easrc_priv *easrc_priv = easrc->private;
+       struct fsl_easrc_ctx_priv *ctx_priv = pair->private;
+       unsigned int in_rate = ctx_priv->in_params.norm_rate;
+       unsigned int out_rate = ctx_priv->out_params.norm_rate;
+       unsigned int channels = pair->channels;
+       unsigned int in_samples, out_samples;
+       unsigned int in_width, out_width;
+       unsigned int out_length;
+       unsigned int frac_bits;
+       u64 val1, val2;
+
+       switch (easrc_priv->rs_num_taps) {
+       case EASRC_RS_32_TAPS:
+               /* integer bits = 5; */
+               frac_bits = 39;
+               break;
+       case EASRC_RS_64_TAPS:
+               /* integer bits = 6; */
+               frac_bits = 38;
+               break;
+       case EASRC_RS_128_TAPS:
+               /* integer bits = 7; */
+               frac_bits = 37;
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       val1 = (u64)in_rate << frac_bits;
+       do_div(val1, out_rate);
+       val1 += (s64)ctx_priv->ratio_mod << (frac_bits - 31);
+
+       in_width = 
snd_pcm_format_physical_width(ctx_priv->in_params.sample_format) / 8;
+       out_width = 
snd_pcm_format_physical_width(ctx_priv->out_params.sample_format) / 8;
+
+       ctx_priv->in_filled_len += input_buffer_length;
+       if (ctx_priv->in_filled_len <= ctx_priv->in_filled_sample * in_width * 
channels) {
+               out_length = 0;
+       } else {
+               in_samples = ctx_priv->in_filled_len / (in_width * channels) -
+                            ctx_priv->in_filled_sample;
+
+               /* right shift 12 bit to make ratio in 32bit space */
+               val2 = (u64)in_samples << (frac_bits - 12);
+               val1 = val1 >> 12;
+               do_div(val2, val1);
+               out_samples = val2;
+
+               out_length = out_samples * out_width * channels;
+               ctx_priv->in_filled_len = ctx_priv->in_filled_sample * in_width 
* channels;
+       }
+
+       return out_length;
+}
+
+static int fsl_easrc_m2m_get_maxburst(u8 dir, struct fsl_asrc_pair *pair)
+{
+       struct fsl_easrc_ctx_priv *ctx_priv = pair->private;
+
+       if (dir == IN)
+               return ctx_priv->in_params.fifo_wtmk * pair->channels;
+       else
+               return ctx_priv->out_params.fifo_wtmk * pair->channels;
+}
+
+static int fsl_easrc_m2m_pair_suspend(struct fsl_asrc_pair *pair)
+{
+       fsl_easrc_stop_context(pair);
+
+       return 0;
+}
+
+static int fsl_easrc_m2m_pair_resume(struct fsl_asrc_pair *pair)
+{
+       struct fsl_easrc_ctx_priv *ctx_priv = pair->private;
+
+       pair->first_convert = 1;
+       ctx_priv->in_filled_len = 0;
+
+       return 0;
+}
+
+/* val is Q31 */
+static int fsl_easrc_m2m_set_ratio_mod(struct fsl_asrc_pair *pair, int val)
+{
+       struct fsl_easrc_ctx_priv *ctx_priv = pair->private;
+       struct fsl_asrc *easrc = pair->asrc;
+       struct fsl_easrc_priv *easrc_priv = easrc->private;
+       unsigned int frac_bits;
+
+       ctx_priv->ratio_mod += val;
+
+       switch (easrc_priv->rs_num_taps) {
+       case EASRC_RS_32_TAPS:
+               /* integer bits = 5; */
+               frac_bits = 39;
+               break;
+       case EASRC_RS_64_TAPS:
+               /* integer bits = 6; */
+               frac_bits = 38;
+               break;
+       case EASRC_RS_128_TAPS:
+               /* integer bits = 7; */
+               frac_bits = 37;
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       val <<= (frac_bits - 31);
+       regmap_write(easrc->regmap, REG_EASRC_RUC(pair->index), 
EASRC_RSUC_RS_RM(val));
+
+       return 0;
+}
+
 static const struct of_device_id fsl_easrc_dt_ids[] = {
        { .compatible = "fsl,imx8mn-easrc",},
        {}
@@ -1926,6 +2131,15 @@ static int fsl_easrc_probe(struct platform_device *pdev)
        easrc->release_pair = fsl_easrc_release_context;
        easrc->get_fifo_addr = fsl_easrc_get_fifo_addr;
        easrc->pair_priv_size = sizeof(struct fsl_easrc_ctx_priv);
+       easrc->m2m_prepare = fsl_easrc_m2m_prepare;
+       easrc->m2m_start = fsl_easrc_m2m_start;
+       easrc->m2m_stop = fsl_easrc_m2m_stop;
+       easrc->get_output_fifo_size = fsl_easrc_get_output_fifo_size;
+       easrc->m2m_calc_out_len = fsl_easrc_m2m_calc_out_len;
+       easrc->m2m_get_maxburst = fsl_easrc_m2m_get_maxburst;
+       easrc->m2m_pair_suspend = fsl_easrc_m2m_pair_suspend;
+       easrc->m2m_pair_resume = fsl_easrc_m2m_pair_resume;
+       easrc->m2m_set_ratio_mod = fsl_easrc_m2m_set_ratio_mod;
 
        easrc_priv->rs_num_taps = EASRC_RS_32_TAPS;
        easrc_priv->const_coeff = 0x3FF0000000000000;
diff --git a/sound/soc/fsl/fsl_easrc.h b/sound/soc/fsl/fsl_easrc.h
index 7c70dac52713..c9f770862662 100644
--- a/sound/soc/fsl/fsl_easrc.h
+++ b/sound/soc/fsl/fsl_easrc.h
@@ -601,6 +601,8 @@ struct fsl_easrc_slot {
  * @out_missed_sample: sample missed in output
  * @st1_addexp: exponent added for stage1
  * @st2_addexp: exponent added for stage2
+ * @ratio_mod: update ratio
+ * @in_filled_len: input filled length
  */
 struct fsl_easrc_ctx_priv {
        struct fsl_easrc_io_params in_params;
@@ -618,6 +620,8 @@ struct fsl_easrc_ctx_priv {
        int out_missed_sample;
        int st1_addexp;
        int st2_addexp;
+       int ratio_mod;
+       unsigned int in_filled_len;
 };
 
 /**
-- 
2.34.1

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