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 18:32:09 +0530
From:   Srinivasa Rao Mandadapu <srivasam@...eaurora.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.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 9/21/2021 2:18 PM, Srinivas Kandagatla wrote:
>
>
> 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.

The default values in tx_defaults are proper. But same value is not 
reflecting in Hardware, but In Cache it's reflecting set value.

>
> 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;
>>>>   }
>>>>
-- 
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