[alsa-devel] [PATCH v3 1/7] ASoC: tegra: add a TDM configuration callback

[Ben Dooks]

On 30/09/2019 21:46, Jon Hunter wrote:
> 
> On 30/09/2019 17:51, Ben Dooks wrote:
>> From: Edward Cragg <edward.cragg at codethink.co.uk>
>>
>> Add a callback to configure TDM settings for the Tegra30 I2S ASoC 'platform'
>> driver.
>>
>> Signed-off-by: Edward Cragg <edward.cragg at codethink.co.uk>
>> [ben.dooks at codethink.co.uk: merge fix for power management]
>> [ben.dooks at codethink.co.uk: add review change for fsync of 1 clock]
>> Signed-off-by: Ben Dooks <ben.dooks at codethink.co.uk>
>> ---
>>   sound/soc/tegra/tegra30_i2s.c | 33 +++++++++++++++++++++++++++++++++
>>   1 file changed, 33 insertions(+)
>>
>> diff --git a/sound/soc/tegra/tegra30_i2s.c b/sound/soc/tegra/tegra30_i2s.c
>> index ac6983c6bd72..7f9ef6abeae2 100644
>> --- a/sound/soc/tegra/tegra30_i2s.c
>> +++ b/sound/soc/tegra/tegra30_i2s.c
>> @@ -254,6 +254,38 @@ static int tegra30_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
>>   	return 0;
>>   }
>>   
>> +/*
>> + * Set up TDM
>> + */
>> +static int tegra30_i2s_set_tdm(struct snd_soc_dai *dai,
>> +			       unsigned int tx_mask, unsigned int rx_mask,
>> +			       int slots, int slot_width)
>> +{
>> +	struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
>> +	unsigned int mask, val;
>> +
>> +	dev_dbg(dai->dev, "%s: txmask=0x%08x rxmask=0x%08x slots=%d width=%d\n",
>> +		 __func__, tx_mask, rx_mask, slots, slot_width);
>> +
>> +	/* Set up slots and tx/rx masks */
>> +	mask = TEGRA30_I2S_SLOT_CTRL_TOTAL_SLOTS_MASK |
>> +	       TEGRA30_I2S_SLOT_CTRL_RX_SLOT_ENABLES_MASK |
>> +	       TEGRA30_I2S_SLOT_CTRL_TX_SLOT_ENABLES_MASK;
>> +
>> +	val = (tx_mask << TEGRA30_I2S_SLOT_CTRL_TX_SLOT_ENABLES_SHIFT) |
>> +	      (rx_mask << TEGRA30_I2S_SLOT_CTRL_RX_SLOT_ENABLES_SHIFT) |
>> +	      ((slots - 1) << TEGRA30_I2S_SLOT_CTRL_TOTAL_SLOTS_SHIFT);
> 
> I am not sure why this keeps changing. Why not set to 1 always?

This is the total number of slots, not the width of the fsync
which has been changed to 1 below this.

-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius

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