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

[Jon Hunter <jonathanh@nvidia.com>]

On 01/10/2019 12:00, Ben Dooks wrote:
> On 30/09/2019 21:46, Jon Hunter wrote:
>>
>> On 30/09/2019 17:51, Ben Dooks wrote:
>>> From: Edward Cragg <edward.cragg@codethink.co.uk>
>>>
>>> Add a callback to configure TDM settings for the Tegra30 I2S ASoC
>>> 'platform'
>>> driver.
>>>
>>> Signed-off-by: Edward Cragg <edward.cragg@codethink.co.uk>
>>> [ben.dooks@codethink.co.uk: merge fix for power management]
>>> [ben.dooks@codethink.co.uk: add review change for fsync of 1 clock]
>>> Signed-off-by: Ben Dooks <ben.dooks@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.

Ah yes indeed. Sorry, should have waited until this morning to look at
this! Jon

-- 
nvpublic
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