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

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Message-ID: <bb1a6cd0-42aa-4452-9203-460ba768e6a0@gmail.com>
Date: Thu, 5 Sep 2024 15:29:07 +0200
From: Konrad Dybcio <konradybcio@...il.com>
To: Jingyi Wang <quic_jingyw@...cinc.com>,
 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>
Cc: 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 3.09.2024 8:21 AM, 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))) {
> +		/* errata: get num of llcc banks. */
> +	} else {
> +		ret = regmap_read(regmap, cfg->reg_offset[LLCC_COMMON_STATUS0], &num_banks);
> +		if (ret)
> +			goto err;
> +
> +		num_banks &= LLCC_LB_CNT_MASK;
> +		num_banks >>= LLCC_LB_CNT_SHIFT;
> +	}

Is num-banks going to be populated by the bootloader, or hardcoded?

If the latter, we may just do so in the driver, hoping no more SoCs
have this erratum..

Konrad