Re: [PATCH] EDAC/qcom: Make irq configuration optional

[Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>]

On Tue, Sep 03, 2024 at 11:31:38AM +0530, Rajendra Nayak wrote:
> On most modern qualcomm SoCs, the configuration necessary to enable the
> Tag/Data RAM realted irqs being propagated to the SoC irq controller is
> already done in firmware (in DSF or 'DDR System Firmware')
> 
> On some like the x1e80100, these registers aren't even accesible to the
> kernel causing a crash when edac device is probed.
> 
> Hence, make the irq configuration optional in the driver and mark x1e80100
> as the SoC on which this should be avoided.
> 
> Fixes: af16b00578a7 ("arm64: dts: qcom: Add base X1E80100 dtsi and the QCP dts")
> Reported-by: Bjorn Andersson <andersson@kernel.org>
> Signed-off-by: Rajendra Nayak <quic_rjendra@quicinc.com>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

- Mani

> ---
>  drivers/edac/qcom_edac.c           | 8 +++++---
>  drivers/soc/qcom/llcc-qcom.c       | 3 +++
>  include/linux/soc/qcom/llcc-qcom.h | 2 ++
>  3 files changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/edac/qcom_edac.c b/drivers/edac/qcom_edac.c
> index d3cd4cc54ace..96611ca09ac5 100644
> --- a/drivers/edac/qcom_edac.c
> +++ b/drivers/edac/qcom_edac.c
> @@ -342,9 +342,11 @@ static int qcom_llcc_edac_probe(struct platform_device *pdev)
>  	int ecc_irq;
>  	int rc;
>  
> -	rc = qcom_llcc_core_setup(llcc_driv_data, llcc_driv_data->bcast_regmap);
> -	if (rc)
> -		return rc;
> +	if (!llcc_driv_data->ecc_irq_configured) {
> +		rc = qcom_llcc_core_setup(llcc_driv_data, llcc_driv_data->bcast_regmap);
> +		if (rc)
> +			return rc;
> +	}
>  
>  	/* Allocate edac control info */
>  	edev_ctl = edac_device_alloc_ctl_info(0, "qcom-llcc", 1, "bank",
> diff --git a/drivers/soc/qcom/llcc-qcom.c b/drivers/soc/qcom/llcc-qcom.c
> index 8fa4ffd3a9b5..b1c0ae9991d6 100644
> --- a/drivers/soc/qcom/llcc-qcom.c
> +++ b/drivers/soc/qcom/llcc-qcom.c
> @@ -139,6 +139,7 @@ struct qcom_llcc_config {
>  	int size;
>  	bool need_llcc_cfg;
>  	bool no_edac;
> +	bool irq_configured;
>  };
>  
>  struct qcom_sct_config {
> @@ -718,6 +719,7 @@ static const struct qcom_llcc_config x1e80100_cfg[] = {
>  		.need_llcc_cfg	= true,
>  		.reg_offset	= llcc_v2_1_reg_offset,
>  		.edac_reg_offset = &llcc_v2_1_edac_reg_offset,
> +		.irq_configured = true,
>  	},
>  };
>  
> @@ -1345,6 +1347,7 @@ static int qcom_llcc_probe(struct platform_device *pdev)
>  	drv_data->cfg = llcc_cfg;
>  	drv_data->cfg_size = sz;
>  	drv_data->edac_reg_offset = cfg->edac_reg_offset;
> +	drv_data->ecc_irq_configured = cfg->irq_configured;
>  	mutex_init(&drv_data->lock);
>  	platform_set_drvdata(pdev, drv_data);
>  
> diff --git a/include/linux/soc/qcom/llcc-qcom.h b/include/linux/soc/qcom/llcc-qcom.h
> index 9e9f528b1370..acad1f4cf854 100644
> --- a/include/linux/soc/qcom/llcc-qcom.h
> +++ b/include/linux/soc/qcom/llcc-qcom.h
> @@ -125,6 +125,7 @@ struct llcc_edac_reg_offset {
>   * @num_banks: Number of llcc banks
>   * @bitmap: Bit map to track the active slice ids
>   * @ecc_irq: interrupt for llcc cache error detection and reporting
> + * @ecc_irq_configured: 'True' if firmware has already configured the irq propagation
>   * @version: Indicates the LLCC version
>   */
>  struct llcc_drv_data {
> @@ -139,6 +140,7 @@ struct llcc_drv_data {
>  	u32 num_banks;
>  	unsigned long *bitmap;
>  	int ecc_irq;
> +	bool ecc_irq_configured;
>  	u32 version;
>  };
>  
> -- 
> 2.34.1
> 

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