[PATCH v2] wifi: ath12k: read country code from SMBIOS for WCN7850

Kang Yang quic_kangyang at quicinc.com
Tue Feb 25 18:14:13 PST 2025



On 2/20/2025 2:26 PM, Kang Yang wrote:
> Read the country code from SMBIOS and send it to the firmware. The
> firmware will then indicate the regulatory domain information for
> the country code, which ath12k will use.
> 
> dmesg:
> [ 1242.637253] ath12k_pci 0000:02:00.0: worldwide regdomain setting from SMBIOS
> [ 1242.637259] ath12k_pci 0000:02:00.0: bdf variant name not found.
> [ 1242.637261] ath12k_pci 0000:02:00.0: SMBIOS bdf variant name not set.
> [ 1242.927543] ath12k_pci 0000:02:00.0: set current country pdev id 0 alpha2 00
> 
> Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-02582-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1
> 
> Signed-off-by: Wen Gong <quic_wgong at quicinc.com>
> Signed-off-by: Kang Yang <quic_kangyang at quicinc.com>
> ---
> 
> Depends-On:
>          [PATCH v11 0/4] wifi: ath12k: add 11d scan offload support and handle country code for WCN7850
>          https://lore.kernel.org/linux-wireless/20250220031056.216-1-quic_kangyang@quicinc.com/
> 
> v2:
>      1. rebase on tag: ath/main(ath-202502181756).
> 	2. rewrite commit message.
> 
> ---
>   drivers/net/wireless/ath/ath12k/core.c | 26 +++++++++++++++++++++++--
>   drivers/net/wireless/ath/ath12k/core.h | 27 +++++++++++++++++++++++++-
>   drivers/net/wireless/ath/ath12k/mac.c  | 11 +++++++++++
>   3 files changed, 61 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/wireless/ath/ath12k/core.c b/drivers/net/wireless/ath/ath12k/core.c
> index 8eaf9dd95a6b..0bdd0cd4f071 100644
> --- a/drivers/net/wireless/ath/ath12k/core.c
> +++ b/drivers/net/wireless/ath/ath12k/core.c
> @@ -629,7 +629,7 @@ static void ath12k_core_stop(struct ath12k_base *ab)
>   	/* De-Init of components as needed */
>   }
>   
> -static void ath12k_core_check_bdfext(const struct dmi_header *hdr, void *data)
> +static void ath12k_core_check_cc_code_bdfext(const struct dmi_header *hdr, void *data)
>   {
>   	struct ath12k_base *ab = data;
>   	const char *magic = ATH12K_SMBIOS_BDF_EXT_MAGIC;
> @@ -651,6 +651,28 @@ static void ath12k_core_check_bdfext(const struct dmi_header *hdr, void *data)
>   		return;
>   	}
>   
> +	spin_lock_bh(&ab->base_lock);
> +
> +	switch (smbios->country_code_flag) {
> +	case ATH12K_SMBIOS_CC_ISO:
> +		ab->new_alpha2[0] = u16_get_bits(smbios->cc_code, 0xff);
> +		ab->new_alpha2[1] = u16_get_bits(smbios->cc_code, 0xff);
> +		ath12k_dbg(ab, ATH12K_DBG_BOOT, "boot smbios cc_code %c%c\n",
> +			   ab->new_alpha2[0], ab->new_alpha2[1]);
> +		break;
> +	case ATH12K_SMBIOS_CC_WW:
> +		ab->new_alpha2[0] = '0';
> +		ab->new_alpha2[1] = '0';
> +		ath12k_dbg(ab, ATH12K_DBG_BOOT, "boot smbios worldwide regdomain\n");
> +		break;
> +	default:
> +		ath12k_dbg(ab, ATH12K_DBG_BOOT, "boot ignore smbios country code setting %d\n",
> +			   smbios->country_code_flag);
> +		break;
> +	}
> +
> +	spin_unlock_bh(&ab->base_lock);
> +
>   	if (!smbios->bdf_enabled) {
>   		ath12k_dbg(ab, ATH12K_DBG_BOOT, "bdf variant name not found.\n");
>   		return;
> @@ -690,7 +712,7 @@ static void ath12k_core_check_bdfext(const struct dmi_header *hdr, void *data)
>   int ath12k_core_check_smbios(struct ath12k_base *ab)
>   {
>   	ab->qmi.target.bdf_ext[0] = '\0';
> -	dmi_walk(ath12k_core_check_bdfext, ab);
> +	dmi_walk(ath12k_core_check_cc_code_bdfext, ab);
>   
>   	if (ab->qmi.target.bdf_ext[0] == '\0')
>   		return -ENODATA;
> diff --git a/drivers/net/wireless/ath/ath12k/core.h b/drivers/net/wireless/ath/ath12k/core.h
> index 569ff02de09a..bd0c106b5098 100644
> --- a/drivers/net/wireless/ath/ath12k/core.h
> +++ b/drivers/net/wireless/ath/ath12k/core.h
> @@ -172,9 +172,34 @@ struct ath12k_ext_irq_grp {
>   	struct net_device *napi_ndev;
>   };
>   
> +enum ath12k_smbios_cc_type {
> +	/* disable country code setting from SMBIOS */
> +	ATH12K_SMBIOS_CC_DISABLE = 0,
> +
> +	/* set country code by ANSI country name, based on ISO3166-1 alpha2 */
> +	ATH12K_SMBIOS_CC_ISO = 1,
> +
> +	/* worldwide regdomain */
> +	ATH12K_SMBIOS_CC_WW = 2,
> +};
> +
>   struct ath12k_smbios_bdf {
>   	struct dmi_header hdr;
> -	u32 padding;
> +	u8 features_disabled;
> +
> +	/* enum ath12k_smbios_cc_type */
> +	u8 country_code_flag;
> +
> +	/* To set specific country, you need to set country code
> +	 * flag=ATH12K_SMBIOS_CC_ISO first, then if country is United
> +	 * States, then country code value = 0x5553 ("US",'U' = 0x55, 'S'=
> +	 * 0x53). To set country to INDONESIA, then country code value =
> +	 * 0x4944 ("IN", 'I'=0x49, 'D'=0x44). If country code flag =
> +	 * ATH12K_SMBIOS_CC_WW, then you can use worldwide regulatory
> +	 * setting.
> +	 */
> +	u16 cc_code;
> +
>   	u8 bdf_enabled;
>   	u8 bdf_ext[];
>   } __packed;
> diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
> index 3b60534fb0f4..e17a35759456 100644
> --- a/drivers/net/wireless/ath/ath12k/mac.c
> +++ b/drivers/net/wireless/ath/ath12k/mac.c
> @@ -11502,6 +11502,17 @@ static int ath12k_mac_hw_register(struct ath12k_hw *ah)
>   			goto err_unregister_hw;
>   		}
>   
> +		if (ar->ab->hw_params->current_cc_support && ab->new_alpha2[0]) {
> +			struct wmi_set_current_country_arg current_cc = {};
> +
> +			memcpy(&current_cc.alpha2, ab->new_alpha2, 2);
> +			memcpy(&ar->alpha2, ab->new_alpha2, 2);
> +			ret = ath12k_wmi_send_set_current_country_cmd(ar, &current_cc);
> +			if (ret)
> +				ath12k_warn(ar->ab,
> +					    "failed set cc code for mac register: %d\n", ret);
> +		}
> +
>   		ath12k_debugfs_register(ar);
>   	}
>   
> 
> base-commit: f22471c17f5849b2f20e2c56ec9fcd9dd8d5bf28
> prerequisite-patch-id: 4d98208c1659b01545c48494f7a84c5ba4888da0
> prerequisite-patch-id: dc095f4a1f0d9f6c4f6f850fa1dfe3d804f41e47
> prerequisite-patch-id: 7bffae693031c27eadd2b3452a059bb224070e0b
> prerequisite-patch-id: 3711a8bb24847dd69c5805d7425416b239144898


Hi, jeff:
	Can you have a review on this patch and dependency patch-set
[PATCH v11 0/4] wifi: ath12k: add 11d scan offload support and handle 
country code for WCN7850





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