linux-kernel - Re: [PATCH v2 4/5] ASoC: codecs: tx-macro: Update tx default values

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Message-ID: <da23bfce-23cd-0869-d752-b0713136072a@linaro.org>
Date:   Tue, 28 Sep 2021 09:31:19 +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 v2 4/5] ASoC: codecs: tx-macro: Update tx default values



On 27/09/2021 17:42, Srinivasa Rao Mandadapu wrote:
> 
> On 9/27/2021 4:12 PM, Srinivas Kandagatla wrote:
> Thanks for your time Srini!!
>>
>> On 22/09/2021 13:31, Srinivasa Rao Mandadapu wrote:
>>> Update mic control register default values to hardware reset values
>>>
>>> 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 | 6 +++---
>>>   1 file changed, 3 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/sound/soc/codecs/lpass-tx-macro.c 
>>> b/sound/soc/codecs/lpass-tx-macro.c
>>> index e980b2e..66c39fb 100644
>>> --- a/sound/soc/codecs/lpass-tx-macro.c
>>> +++ b/sound/soc/codecs/lpass-tx-macro.c
>>> @@ -279,7 +279,7 @@ static const struct reg_default tx_defaults[] = {
>>>       { CDC_TX_CLK_RST_CTRL_SWR_CONTROL, 0x00},
>>>       { CDC_TX_TOP_CSR_TOP_CFG0, 0x00},
>>>       { CDC_TX_TOP_CSR_ANC_CFG, 0x00},
>>> -    { CDC_TX_TOP_CSR_SWR_CTRL, 0x00},
>>> +    { CDC_TX_TOP_CSR_SWR_CTRL, 0x60},
>>
>> This does not make sense as this register only has one bit to control.
>> Why do we even need to change this, can you please explain what 
>> happens if we do not change this?
> 
> This register change is not making any impact. But when verified , reset 
> state of this register is 0x60. so is the reason for change.
> 
> Will revert it and post again.
> 
>>
>>>       { CDC_TX_TOP_CSR_FREQ_MCLK, 0x00},
>>>       { CDC_TX_TOP_CSR_DEBUG_BUS, 0x00},
>>>       { CDC_TX_TOP_CSR_DEBUG_EN, 0x00},
>>> @@ -290,8 +290,8 @@ static const struct reg_default tx_defaults[] = {
>>>       { CDC_TX_TOP_CSR_SWR_DMIC1_CTL, 0x00},
>>>       { CDC_TX_TOP_CSR_SWR_DMIC2_CTL, 0x00},
>>>       { CDC_TX_TOP_CSR_SWR_DMIC3_CTL, 0x00},
>>> -    { CDC_TX_TOP_CSR_SWR_AMIC0_CTL, 0x00},
>>> -    { CDC_TX_TOP_CSR_SWR_AMIC1_CTL, 0x00},
>>> +    { CDC_TX_TOP_CSR_SWR_AMIC0_CTL, 0x0E},
>>> +    { CDC_TX_TOP_CSR_SWR_AMIC1_CTL, 0x0E},
>>
>> These two registers should have default value of 0x06 as this has only 
>> one clk selection field with bits 2:1.
> 
> In Kodiak document reset state 0x0E and clk selection field is with bits 3:1
> 
> *LPASS_TX_TX_TOP_CSR_SWR_MIC1_CTL*|0x32200D4
> Offset: 	0x54 	Reset State: 	0x0000000E 

In that case you should probably consider using regmap_register_patch() 
for corrections to the default registers in sm8250 case.

--srini

> 
>>
>> -srini
>>
>>
>>>       { CDC_TX_INP_MUX_ADC_MUX0_CFG0, 0x00},
>>>       { CDC_TX_INP_MUX_ADC_MUX0_CFG1, 0x00},
>>>       { CDC_TX_INP_MUX_ADC_MUX1_CFG0, 0x00},
>>>
> -- 
> Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc.,
> is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
>