On Tue, Sep 29, 2015 at 04:09:20PM +0200, Cyrille Pitchen wrote:
> + if (pending & ATMEL_I2SC_INT_RXOR) {
> + mask = ATMEL_I2SC_SR_RXOR;
> +
> + for (ch = 0; ch < ATMEL_I2SC_MAX_TDM_CHANNELS; ++ch)
> + if (sr & ATMEL_I2SC_SR_RXORCH(ch)) {
> + mask |= ATMEL_I2SC_SR_RXORCH(ch);
> + dev_err(dev->dev,
> + "RX overrun on channel %d\n", ch);
> + }
> + regmap_write(dev->regmap, ATMEL_I2SC_SCR, mask);
> + }
Coding style - the for loop needs { } for legibility.
> + if (pending & ATMEL_I2SC_INT_TXUR) {
> + mask = ATMEL_I2SC_SR_TXUR;
> +
> + for (ch = 0; ch < ATMEL_I2SC_MAX_TDM_CHANNELS; ++ch)
> + if (sr & ATMEL_I2SC_SR_TXURCH(ch)) {
> + mask |= ATMEL_I2SC_SR_TXURCH(ch);
> + dev_err(dev->dev,
> + "TX underrun on channel %d\n", ch);
> + }
> + regmap_write(dev->regmap, ATMEL_I2SC_SCR, mask);
> +
> + }
> +
> + return IRQ_HANDLED;
This IRQ_HANDLED should be generated only if one of the interrupts we
know about got handled - there was a check to see if any of the unmasked
bits is set earlier on in the function but that's not quite the same
check.
> +
> +static int atmel_i2s_prepare(struct snd_pcm_substream *substream,
> + struct snd_soc_dai *dai)
> +{
> + struct atmel_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
> + bool is_playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
> + unsigned int rhr, sr = 0;
> +
> + if (is_playback) {
> + regmap_read(dev->regmap, ATMEL_I2SC_SR, &sr);
> + if (sr & ATMEL_I2SC_SR_RXRDY) {
> + dev_dbg(dev->dev, "RXRDY is set\n");
> + regmap_read(dev->regmap, ATMEL_I2SC_RHR, &rhr);
> + }
> + }
What's this doing? It just seems to do two reads and issue a debug
message...
> +static int atmel_i2s_sama5d2_mck_init(struct atmel_i2s_dev *dev,
> + struct device_node *np)
> +{
> + #define SFR_I2SCLKSEL 0x90U
> + struct regmap *sfr;
> + int id;
> +
> + id = of_alias_get_id(np, "i2s");
> + if (id < 0) {
> + dev_err(dev->dev, "failed to get alias ID\n");
> + return id;
> + }
> + if (id > 1) {
> + dev_err(dev->dev, "invalid I2S controller ID: %d\n", id);
> + return -EINVAL;
> + }
This didn't appear in the DT binding and looks pretty funky - what's
going on here?
> + sfr = syscon_regmap_lookup_by_compatible("atmel,sama5d2-sfr");
> + if (IS_ERR(sfr)) {
> + dev_err(dev->dev, "failed to get SFR syscon\n");
> + return PTR_ERR(sfr);
> + }
This didn't appear in the binding either.
> + /* Get hardware capabilities. */
> + match = of_match_node(atmel_i2s_dt_ids, np);
> + dev->caps = match ? match->data : NULL;
Please don't abuse the ternery operator like this, just write a normal
if statement :/
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