Re: [PATCH 07/13] ASoC: ti: davinci-i2s: Add TDM support

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Hi Péter,

+static int davinci_i2s_set_tdm_slot(struct snd_soc_dai *cpu_dai,
+				    unsigned int tx_mask,
+				    unsigned int rx_mask,
+				    int slots, int slot_width)
+{
+	struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
+
+	dev_dbg(dev->dev, "%s - slots %d, slot_width %d\n", __func__, slots, slot_width);

The __func__ can be ommited, it is better to leave it for dynamic
debugging by adding "dyndbg=+pmf" module parameter if needed.


True, I'll remove the __func__.

+
+	if (slots > 128 || !slots) {
+		dev_err(dev->dev, "Invalid number of slots\n");
+		return -EINVAL;
+	}
+
+	if (rx_mask != (1 << slots) - 1) {
+		dev_err(dev->dev, "Invalid RX mask (0x%08x) : all slots must be used by McBSP\n",
+			rx_mask);
+		return -EINVAL;

This is only a restriction for RX?


Nope you're right, I'll add the same for tx_mask.

+	}
+
+	if (davinci_i2s_tdm_word_length(slot_width) < 0) {
+		dev_err(dev->dev, "%s: Unsupported slot_width %d\n", __func__, slot_width);
+		return -EINVAL;
+	}
+
+	dev->tdm_slots = slots;
+	dev->slot_width = slot_width;
+
+	return 0;
+}
+
  #define DEFAULT_BITPERSAMPLE	16
static int davinci_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
@@ -228,6 +282,13 @@ static int davinci_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
  		DAVINCI_MCBSP_SRGR_FWID(DEFAULT_BITPERSAMPLE - 1);
dev->fmt = fmt;
+
+	if ((dev->tdm_slots || dev->slot_width) &&
+	    ((fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) != SND_SOC_DAIFMT_BP_FC)) {
+		dev_err(dev->dev, "TDM is only supported for BP_FC format\n");
+		return -EINVAL;

I think this is not a valid statement, Fsync can be generated internally
or coming from external source in TDM mode also.


My hardware allow me to only test BP_FC so I wished to put some
'barriers' in front of untested things.


Best regards,
Bastien




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