linux-kernel - Re: [PATCH 2/6] soc: qcom: smem: Add pcode/fcode getters

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Message-ID: <oq2g3vilhzu4comajkzk3hbx2ycocxbqc57q7zunpx4p37mafk@sglx5mb6dpdf>
Date: Tue, 9 Apr 2024 10:20:18 -0500
From: Bjorn Andersson <andersson@...nel.org>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: Rob Clark <robdclark@...il.com>, 
	Abhinav Kumar <quic_abhinavk@...cinc.com>, Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
	Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org, 
	Neil Armstrong <neil.armstrong@...aro.org>
Subject: Re: [PATCH 2/6] soc: qcom: smem: Add pcode/fcode getters

On Fri, Apr 05, 2024 at 10:41:30AM +0200, Konrad Dybcio wrote:
> Introduce getters for SoC product and feature codes and export them.
> 

Thought I commented on this already, but I don't see my reply...

Can you please elaborate on what this stuff is, such that we have a
track record in the history of this driver as well, for those of us that
don't know what "feature/product codes" contain or are good for (or have
forgotten next week).

Regards,
Bjorn

> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>  drivers/soc/qcom/smem.c       | 66 +++++++++++++++++++++++++++++++++++++++++++
>  include/linux/soc/qcom/smem.h |  2 ++
>  2 files changed, 68 insertions(+)
> 
> diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
> index 7191fa0c087f..e89b4d26877a 100644
> --- a/drivers/soc/qcom/smem.c
> +++ b/drivers/soc/qcom/smem.c
> @@ -795,6 +795,72 @@ int qcom_smem_get_soc_id(u32 *id)
>  }
>  EXPORT_SYMBOL_GPL(qcom_smem_get_soc_id);
>  
> +/**
> + * qcom_smem_get_feature_code() - return the feature code
> + * @id:	On success, we return the feature code here.
> + *
> + * Look up the feature code identifier from SMEM and return it.
> + *
> + * Return: 0 on success, negative errno on failure.
> + */
> +int qcom_smem_get_feature_code(u32 *code)
> +{
> +	struct socinfo *info;
> +	u32 raw_code;
> +
> +	info = qcom_smem_get(QCOM_SMEM_HOST_ANY, SMEM_HW_SW_BUILD_ID, NULL);
> +	if (IS_ERR(info))
> +		return PTR_ERR(info);
> +
> +	/* This only makes sense for socinfo >= 16 */
> +	if (__le32_to_cpu(info->fmt) < SOCINFO_VERSION(0, 16))
> +		return -EINVAL;
> +
> +	raw_code = __le32_to_cpu(info->feature_code);
> +
> +	/* Ensure the value makes sense */
> +	if (raw_code >= SOCINFO_FC_INT_RESERVE)
> +		raw_code = SOCINFO_FC_UNKNOWN;
> +
> +	*code = raw_code;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(qcom_smem_get_feature_code);
> +
> +/**
> + * qcom_smem_get_product_code() - return the product code
> + * @id:	On success, we return the product code here.
> + *
> + * Look up feature code identifier from SMEM and return it.
> + *
> + * Return: 0 on success, negative errno on failure.
> + */
> +int qcom_smem_get_product_code(u32 *code)
> +{
> +	struct socinfo *info;
> +	u32 raw_code;
> +
> +	info = qcom_smem_get(QCOM_SMEM_HOST_ANY, SMEM_HW_SW_BUILD_ID, NULL);
> +	if (IS_ERR(info))
> +		return PTR_ERR(info);
> +
> +	/* This only makes sense for socinfo >= 16 */
> +	if (__le32_to_cpu(info->fmt) < SOCINFO_VERSION(0, 16))
> +		return -EINVAL;
> +
> +	raw_code = __le32_to_cpu(info->pcode);
> +
> +	/* Ensure the value makes sense */
> +	if (raw_code >= SOCINFO_FC_INT_RESERVE)
> +		raw_code = SOCINFO_FC_UNKNOWN;
> +
> +	*code = raw_code;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(qcom_smem_get_product_code);
> +
>  static int qcom_smem_get_sbl_version(struct qcom_smem *smem)
>  {
>  	struct smem_header *header;
> diff --git a/include/linux/soc/qcom/smem.h b/include/linux/soc/qcom/smem.h
> index a36a3b9d4929..aef8c9fc6c08 100644
> --- a/include/linux/soc/qcom/smem.h
> +++ b/include/linux/soc/qcom/smem.h
> @@ -13,5 +13,7 @@ int qcom_smem_get_free_space(unsigned host);
>  phys_addr_t qcom_smem_virt_to_phys(void *p);
>  
>  int qcom_smem_get_soc_id(u32 *id);
> +int qcom_smem_get_feature_code(u32 *code);
> +int qcom_smem_get_product_code(u32 *code);
>  
>  #endif
> 
> -- 
> 2.40.1
>