linux-kernel - Re: [PATCH 3/4] soc: qcom: llcc: add errata to get bank num

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Message-ID: <407fc8ff-8058-4ab4-a822-7a5e47e5b301@quicinc.com>
Date: Tue, 3 Sep 2024 15:17:52 +0800
From: Jingyi Wang <quic_jingyw@...cinc.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
CC: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio
	<konradybcio@...nel.org>,
        Conor Dooley <conor@...nel.org>, Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] soc: qcom: llcc: add errata to get bank num



On 9/3/2024 3:13 PM, Krzysztof Kozlowski wrote:
> On Tue, Sep 03, 2024 at 02:21:31PM +0800, Jingyi Wang wrote:
>> Use "num-banks" property to indicate the actual num of banks for
>> errata.
>>
>> Signed-off-by: Jingyi Wang <quic_jingyw@...cinc.com>
>> ---
>>  drivers/soc/qcom/llcc-qcom.c | 15 ++++++++++-----
>>  1 file changed, 10 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/soc/qcom/llcc-qcom.c b/drivers/soc/qcom/llcc-qcom.c
>> index 8fa4ffd3a9b5..3fb45e625d82 100644
>> --- a/drivers/soc/qcom/llcc-qcom.c
>> +++ b/drivers/soc/qcom/llcc-qcom.c
>> @@ -1275,12 +1275,17 @@ static int qcom_llcc_probe(struct platform_device *pdev)
>>  		goto err;
>>  	cfg = &cfgs->llcc_config[cfg_index];
>>  
>> -	ret = regmap_read(regmap, cfg->reg_offset[LLCC_COMMON_STATUS0], &num_banks);
>> -	if (ret)
>> -		goto err;
>> +	if (unlikely(!of_property_read_u32(dev->of_node, "num-banks", &num_banks))) {
> 
> Drop unlikely.
> 
>> +		/* errata: get num of llcc banks. */
> 
> Huh? What?
> 
>> +	} else {
>> +		ret = regmap_read(regmap, cfg->reg_offset[LLCC_COMMON_STATUS0], &num_banks);
>> +		if (ret)
>> +			goto err;
> 
> Sorry, but what? You can read it from hardware, but you add DT property?
> No, that's just wrong. Why commit msg explains nothing about reasons and
> problem you are solving?
> 
we need the property because there is hardware errata on this SoC, regmap_read get wrong num.
> Best regards,
> Krzysztof
> 
Thanks,
Jingyi