On Wed, Apr 17, 2024 at 10:02:54PM +0200, Konrad Dybcio wrote:
> Recent (SM8550+ ish) Qualcomm SoCs have a new mechanism for precisely
> identifying the specific SKU and the precise speed bin (in the general
> meaning of this word, anyway): a pair of values called Product Code
> and Feature Code.
>
> Based on this information, we can deduce the available frequencies for
> things such as Adreno. In the case of Adreno specifically, Pcode is
> useless for non-prototype SoCs.
>
> Introduce a getter for the feature code and export it.
>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
> ---
> drivers/soc/qcom/smem.c | 33 +++++++++++++++++++++++++++++++++
> include/linux/soc/qcom/smem.h | 1 +
> include/linux/soc/qcom/socinfo.h | 26 ++++++++++++++++++++++++++
> 3 files changed, 60 insertions(+)
>
> diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
> index 7191fa0c087f..29e708789eec 100644
> --- a/drivers/soc/qcom/smem.c
> +++ b/drivers/soc/qcom/smem.c
> @@ -795,6 +795,39 @@ 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
> + * @code: On success, 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 -EOPNOTSUPP;
> +
> + raw_code = __le32_to_cpu(info->feature_code);
> +
> + /* Ensure the value makes sense */
> + if (raw_code >= SOCINFO_FC_INT_MAX)
> + raw_code = SOCINFO_FC_UNKNOWN;
> +
> + *code = raw_code;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(qcom_smem_get_feature_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..0943bf419e11 100644
> --- a/include/linux/soc/qcom/smem.h
> +++ b/include/linux/soc/qcom/smem.h
> @@ -13,5 +13,6 @@ 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);
>
> #endif
> diff --git a/include/linux/soc/qcom/socinfo.h b/include/linux/soc/qcom/socinfo.h
> index 10e0a4c287f4..52439f48428f 100644
> --- a/include/linux/soc/qcom/socinfo.h
> +++ b/include/linux/soc/qcom/socinfo.h
> @@ -3,6 +3,8 @@
> #ifndef __QCOM_SOCINFO_H__
> #define __QCOM_SOCINFO_H__
>
> +#include <linux/types.h>
> +
> /*
> * SMEM item id, used to acquire handles to respective
> * SMEM region.
> @@ -82,4 +84,28 @@ struct socinfo {
> __le32 boot_core;
> };
>
> +/* Internal feature codes */
> +enum qcom_socinfo_feature_code {
> + /* External feature codes */
> + SOCINFO_FC_UNKNOWN = 0x0,
> + SOCINFO_FC_AA,
> + SOCINFO_FC_AB,
> + SOCINFO_FC_AC,
> + SOCINFO_FC_AD,
> + SOCINFO_FC_AE,
> + SOCINFO_FC_AF,
> + SOCINFO_FC_AG,
> + SOCINFO_FC_AH,
> +};
> +
> +/* Internal feature codes */
> +/* Valid values: 0 <= n <= 0xf */
> +#define SOCINFO_FC_Yn(n) (0xf1 + n)
> +#define SOCINFO_FC_INT_MAX SOCINFO_FC_Yn(0x10)
This is 0x101 rather than 0x100 or 0xff. Is that expected?
> +
> +/* Product codes */
> +#define SOCINFO_PC_UNKNOWN 0
> +#define SOCINFO_PCn(n) (n + 1)
> +#define SOCINFO_PC_RESERVE (BIT(31) - 1)
This patch works on fcodes, why do we have PCode defines here?
> +
> #endif
>
> --
> 2.44.0
>
--
With best wishes
Dmitry
