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 <[email protected]>
---
sound/soc/fsl/fsl_easrc.c | 214 ++++++++++++++++++++++++++++++++++++++
sound/soc/fsl/fsl_easrc.h | 6 ++
2 files changed, 220 insertions(+)
diff --git a/sound/soc/fsl/fsl_easrc.c b/sound/soc/fsl/fsl_easrc.c
index 670cbdb361b6..b735b24badc2 100644
--- a/sound/soc/fsl/fsl_easrc.c
+++ b/sound/soc/fsl/fsl_easrc.c
@@ -1861,6 +1861,210 @@ 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_start_part_one(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 */
+ ctx_priv->first_convert = 1;
+ return 0;
+}
+
+static int fsl_easrc_m2m_start_part_two(struct fsl_asrc_pair *pair)
+{
+ struct fsl_easrc_ctx_priv *ctx_priv = pair->private;
+ /* start context once */
+ if (ctx_priv->first_convert) {
+ fsl_easrc_start_context(pair);
+ ctx_priv->first_convert = 0;
+ }
+
+ return 0;
+}
+
+static int fsl_easrc_m2m_stop_part_two(struct fsl_asrc_pair *pair)
+{
+ struct fsl_easrc_ctx_priv *ctx_priv = pair->private;
+ /* Stop pair/context */
+ if (!ctx_priv->first_convert) {
+ fsl_easrc_stop_context(pair);
+ ctx_priv->first_convert = 1;
+ }
+
+ return 0;
+}
+
+static int fsl_easrc_m2m_check_format(u8 dir, u32 rate, u32 channels, u32 format)
+{
+ u64 support_format = FSL_EASRC_FORMATS;
+
+ if (channels < 1 || channels > 32)
+ return -EINVAL;
+
+ if (rate < 8000 || rate > 768000)
+ return -EINVAL;
+
+ if (dir == OUT)
+ support_format |= SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE;
+
+ if (!(1 << format & support_format))
+ return -EINVAL;
+
+ 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 = val1 + ctx_priv->ratio_mod;
+
+ 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;
+
+ ctx_priv->first_convert = 1;
+ ctx_priv->in_filled_len = 0;
+
+ return 0;
+}
+
+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;
+
+ ctx_priv->ratio_mod += val;
+ 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 +2130,16 @@ 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_start_part_one = fsl_easrc_m2m_start_part_one;
+ easrc->m2m_start_part_two = fsl_easrc_m2m_start_part_two;
+ easrc->m2m_stop_part_two = fsl_easrc_m2m_stop_part_two;
+ easrc->get_output_fifo_size = fsl_easrc_get_output_fifo_size;
+ easrc->m2m_check_format = fsl_easrc_m2m_check_format;
+ 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..bee887c8b4f2 100644
--- a/sound/soc/fsl/fsl_easrc.h
+++ b/sound/soc/fsl/fsl_easrc.h
@@ -601,6 +601,9 @@ 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
+ * @first_convert: start of conversion
+ * @in_filled_len: input filled length
*/
struct fsl_easrc_ctx_priv {
struct fsl_easrc_io_params in_params;
@@ -618,6 +621,9 @@ struct fsl_easrc_ctx_priv {
int out_missed_sample;
int st1_addexp;
int st2_addexp;
+ int ratio_mod;
+ unsigned int first_convert;
+ unsigned int in_filled_len;
};
/**
--
2.34.1
Hi Shengjiu,
On Wed, Jun 28, 2023 at 11:10 PM Shengjiu Wang <[email protected]> wrote:
>
> 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 <[email protected]>
Could you please explain what is the benefit of using M2M in the EASRC driver?
A few weeks ago, an imx8mn user reported that the EASRC with the
mainline kernel introduces huge delays.
Does M2M help with this aspect?
Thanks