linux-kernel - Re: [PATCH 3/7] ASoC: codecs: tx-macro: Change mic control registers to volatile

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Date:   Tue, 21 Sep 2021 09:48:33 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Srinivasa Rao Mandadapu <srivasam@...eaurora.org>,
        agross@...nel.org, bjorn.andersson@...aro.org, lgirdwood@...il.com,
        broonie@...nel.org, robh+dt@...nel.org, plai@...eaurora.org,
        bgoswami@...eaurora.org, perex@...ex.cz, tiwai@...e.com,
        rohitkr@...eaurora.org, linux-arm-msm@...r.kernel.org,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, swboyd@...omium.org,
        judyhsiao@...omium.org
Cc:     Venkata Prasad Potturu <potturu@...eaurora.org>
Subject: Re: [PATCH 3/7] ASoC: codecs: tx-macro: Change mic control registers
 to volatile



On 21/09/2021 08:30, Srinivasa Rao Mandadapu wrote:
> 
> On 9/20/2021 6:54 PM, Srinivas Kandagatla wrote:
> Thanks for your time Srini!!
>>
>> On 20/09/2021 08:35, Srinivasa Rao Mandadapu wrote:
>>> Update amic and dmic related tx macro control registers to volatile
>>>
>>> Fixes: c39667ddcfc5 (ASoC: codecs: lpass-tx-macro: add support for 
>>> lpass tx macro)
>>>
>>> Signed-off-by: Venkata Prasad Potturu <potturu@...eaurora.org>
>>> Signed-off-by: Srinivasa Rao Mandadapu <srivasam@...eaurora.org>
>>> ---
>>>   sound/soc/codecs/lpass-tx-macro.c | 13 +++++++++++++
>>>   1 file changed, 13 insertions(+)
>>>
>>> diff --git a/sound/soc/codecs/lpass-tx-macro.c 
>>> b/sound/soc/codecs/lpass-tx-macro.c
>>> index 9273724..e65b592 100644
>>> --- a/sound/soc/codecs/lpass-tx-macro.c
>>> +++ b/sound/soc/codecs/lpass-tx-macro.c
>>> @@ -423,6 +423,13 @@ static bool tx_is_volatile_register(struct 
>>> device *dev, unsigned int reg)
>>>       case CDC_TX_TOP_CSR_SWR_DMIC1_CTL:
>>>       case CDC_TX_TOP_CSR_SWR_DMIC2_CTL:
>>>       case CDC_TX_TOP_CSR_SWR_DMIC3_CTL:
>>> +    case CDC_TX_TOP_CSR_SWR_AMIC0_CTL:
>>> +    case CDC_TX_TOP_CSR_SWR_AMIC1_CTL:
>>> +    case CDC_TX_CLK_RST_CTRL_MCLK_CONTROL:
>>> +    case CDC_TX_CLK_RST_CTRL_FS_CNT_CONTROL:
>>> +    case CDC_TX_CLK_RST_CTRL_SWR_CONTROL:
>>> +    case CDC_TX_TOP_CSR_SWR_CTRL:
>>> +    case CDC_TX0_TX_PATH_SEC7:
>>
>> Why are these marked as Volatile?
>> Can you provide some details on the issue that you are seeing?
>>
>> --srini
> 
> Without volatile these registers are not reflecting in Hardware and 
> playback and capture is not working.
> 
> Will do recheck and keep only required registers as volatile.

This sounds like a total hack to me,

this might be happening in your case:

The default values for this register are different to actual defaults.
Ex: CDC_TX_TOP_CSR_SWR_AMIC0_CTL default is 0x00
so writing 0x0 to this register will be no-op as there is no change in 
the register value as compared to default value as per regmap.

In you case make sure the hardware default values are correctly 
reflected in tx_defaults array.

Then setting the desired value should work.


--srini



> 
>>
>>
>>>           return true;
>>>       }
>>>       return false;
>>> @@ -1674,6 +1681,12 @@ static int tx_macro_component_probe(struct 
>>> snd_soc_component *comp)
>>>         snd_soc_component_update_bits(comp, CDC_TX0_TX_PATH_SEC7, 0x3F,
>>>                         0x0A);
>>> +    snd_soc_component_update_bits(comp, 
>>> CDC_TX_TOP_CSR_SWR_AMIC0_CTL, 0xFF, 0x00);
>>> +    snd_soc_component_update_bits(comp, 
>>> CDC_TX_TOP_CSR_SWR_AMIC1_CTL, 0xFF, 0x00);
>>> +    snd_soc_component_update_bits(comp, 
>>> CDC_TX_TOP_CSR_SWR_DMIC0_CTL, 0xFF, 0x00);
>>> +    snd_soc_component_update_bits(comp, 
>>> CDC_TX_TOP_CSR_SWR_DMIC1_CTL, 0xFF, 0x00);
>>> +    snd_soc_component_update_bits(comp, 
>>> CDC_TX_TOP_CSR_SWR_DMIC2_CTL, 0xFF, 0x00);
>>> +    snd_soc_component_update_bits(comp, 
>>> CDC_TX_TOP_CSR_SWR_DMIC3_CTL, 0xFF, 0x00);
>>>         return 0;
>>>   }
>>>