linux-kernel - Re: [PATCH v6 17/17] soc: qcom: llcc: Do not create EDAC platform device on SDM845

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Message-ID: <d3cd9b7a-6286-a140-d205-6d4b6ca8092d@linaro.org>
Date:   Wed, 18 Jan 2023 16:37:29 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, bp@...en8.de,
        tony.luck@...el.com
Cc:     quic_saipraka@...cinc.com, konrad.dybcio@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        james.morse@....com, mchehab@...nel.org, rric@...nel.org,
        linux-edac@...r.kernel.org, quic_ppareek@...cinc.com,
        luca.weiss@...rphone.com, ahalaney@...hat.com, steev@...i.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v6 17/17] soc: qcom: llcc: Do not create EDAC platform
 device on SDM845

On 18/01/2023 16:09, Manivannan Sadhasivam wrote:
> The platforms based on SDM845 SoC locks the access to EDAC registers in the
> bootloader. So probing the EDAC driver will result in a crash. Hence,
> disable the creation of EDAC platform device on all SDM845 devices.
> 
> The issue has been observed on Lenovo Yoga C630 and DB845c.
> 
> Cc: <stable@...r.kernel.org> # 5.10
> Reported-by: Steev Klimaszewski <steev@...i.org>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>  drivers/soc/qcom/llcc-qcom.c | 17 ++++++++++++-----
>  1 file changed, 12 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/soc/qcom/llcc-qcom.c b/drivers/soc/qcom/llcc-qcom.c
> index 7b7c5a38bac6..8d840702df50 100644
> --- a/drivers/soc/qcom/llcc-qcom.c
> +++ b/drivers/soc/qcom/llcc-qcom.c
> @@ -1012,11 +1012,18 @@ static int qcom_llcc_probe(struct platform_device *pdev)
>  
>  	drv_data->ecc_irq = platform_get_irq_optional(pdev, 0);
>  
> -	llcc_edac = platform_device_register_data(&pdev->dev,
> -					"qcom_llcc_edac", -1, drv_data,
> -					sizeof(*drv_data));
> -	if (IS_ERR(llcc_edac))
> -		dev_err(dev, "Failed to register llcc edac driver\n");
> +	/*
> +	 * The platforms based on SDM845 SoC locks the access to EDAC registers
> +	 * in bootloader. So probing the EDAC driver will result in a crash.
> +	 * Hence, disable the creation of EDAC platform device on SDM845.
> +	 */
> +	if (!of_device_is_compatible(dev->of_node, "qcom,sdm845-llcc")) {

Don't spread of_device_is_compatible() in driver code. You have driver
data for this.

Best regards,
Krzysztof