linux-kernel - Re: [PATCH v2 2/3] soc: qcom: llcc: Add LLCC configuration for the QCS8300 platform

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Message-ID: <b914945e-4de2-436e-afdf-3c3ce07f4073@quicinc.com>
Date: Mon, 28 Oct 2024 10:22:47 +0800
From: Jingyi Wang <quic_jingyw@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.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>,
        Conor Dooley
	<conor+dt@...nel.org>, <quic_tengfan@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_tingweiz@...cinc.com>,
        <quic_aiquny@...cinc.com>
Subject: Re: [PATCH v2 2/3] soc: qcom: llcc: Add LLCC configuration for the
 QCS8300 platform



On 10/20/2024 12:29 AM, Dmitry Baryshkov wrote:
> On Thu, Oct 10, 2024 at 06:08:47PM +0800, Jingyi Wang wrote:
>> Add LLCC configuration for the QCS8300 platform. There is an errata on
>> LB_CNT information on QCS8300 platform, override the value to get the
>> right number of banks.
>>
>> Signed-off-by: Jingyi Wang <quic_jingyw@...cinc.com>
>> ---
>>  drivers/soc/qcom/llcc-qcom.c | 72 ++++++++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 72 insertions(+)
>>
>> @@ -3391,6 +3456,12 @@ static int qcom_llcc_probe(struct platform_device *pdev)
>>  	num_banks >>= LLCC_LB_CNT_SHIFT;
>>  	drv_data->num_banks = num_banks;
>>  
>> +	/* LB_CNT information is wrong on QCS8300, override the value */
>> +	if (of_device_is_compatible(dev->of_node, "qcom,qcs8300-llcc")) {
>> +		num_banks = 4;
>> +		drv_data->num_banks = 4;
>> +	}
> 
> Nit: I think it might be better to skip reading LLCC_COMMON_STATUS0
> register completely and just set num_banks instead. See [1]
> 
> [1] https://lore.kernel.org/linux-arm-msm/20241019-sar2130p-llcc-v1-2-4e09063d04f2@linaro.org/
> 

Just went through the series and the follow up sereies, I think it is a good idea to
add the property in the config. Thanks!


>> +
>>  	drv_data->regmaps = devm_kcalloc(dev, num_banks, sizeof(*drv_data->regmaps), GFP_KERNEL);
>>  	if (!drv_data->regmaps) {
>>  		ret = -ENOMEM;
>> @@ -3484,6 +3555,7 @@ static int qcom_llcc_probe(struct platform_device *pdev)
>>  }
>>  
>>  static const struct of_device_id qcom_llcc_of_match[] = {
>> +	{ .compatible = "qcom,qcs8300-llcc", .data = &qcs8300_cfgs},
>>  	{ .compatible = "qcom,qdu1000-llcc", .data = &qdu1000_cfgs},
>>  	{ .compatible = "qcom,sa8775p-llcc", .data = &sa8775p_cfgs },
>>  	{ .compatible = "qcom,sc7180-llcc", .data = &sc7180_cfgs },
>>
>> -- 
>> 2.25.1
>>
> 
Thanks，
Jingyi