Re: [PATCH] ath11k: add read country code from SMBIOS for WCN6855/QCA6390

From: Kalle Valo <kvalo@kernel.org>
To: Wen Gong <quic_wgong@quicinc.com>
Cc: <ath11k@lists.infradead.org>, <linux-wireless@vger.kernel.org>
Subject: Re: [PATCH] ath11k: add read country code from SMBIOS for WCN6855/QCA6390
Date: Sat, 23 Apr 2022 12:53:01 +0300	[thread overview]
Message-ID: <8735i4m8hu.fsf@kernel.org> (raw)
In-Reply-To: <20220421023501.32167-1-quic_wgong@quicinc.com> (Wen Gong's message of "Wed, 20 Apr 2022 22:35:01 -0400")

Wen Gong <quic_wgong@quicinc.com> writes:

> This read the country code from SMBIOS and send the country code
> to firmware, firmware will indicate the regulatory domain info of the
> country code and then ath11k will use the info.
>
> dmesg:
> [ 1242.637173] ath11k_pci 0000:02:00.0: chip_id 0x2 chip_family 0xb board_id 0xff soc_id 0x400c0200
> [ 1242.637176] ath11k_pci 0000:02:00.0: fw_version 0x110b09e5 fw_build_timestamp 2021-06-22 09:32 fw_build_id QC_IMAGE_VERSION_STRING=WLAN.HSP.1.1-02533-QCAHSPSWPL_V1_V2_SILICONZ_LITE-1
> [ 1242.637253] ath11k_pci 0000:02:00.0: worldwide regdomain setting from SMBIOS
> [ 1242.637259] ath11k_pci 0000:02:00.0: bdf variant name not found.
> [ 1242.637261] ath11k_pci 0000:02:00.0: SMBIOS bdf variant name not set.
> [ 1242.637263] ath11k_pci 0000:02:00.0: DT bdf variant name not set.
> [ 1242.927543] ath11k_pci 0000:02:00.0: set current country pdev id 0 alpha2 00
>
> Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3
>
> Signed-off-by: Wen Gong <quic_wgong@quicinc.com>

[...]

> --- a/drivers/net/wireless/ath/ath11k/core.h
> +++ b/drivers/net/wireless/ath/ath11k/core.h
> @@ -169,12 +169,31 @@ struct ath11k_ext_irq_grp {
>  	struct net_device napi_ndev;
>  };
>  
> +enum ath11k_smbios_cc_type {
> +	/* disable country code setting from SMBIOS */
> +	ATH11K_SMBIOS_CC_DISABLE = 0,
> +	/* set country code by ANSI country name, based on ISO3166-1 alpha2 */
> +	ATH11K_SMBIOS_CC_ISO = 1,
> +	/* worldwide regdomain */
> +	ATH11K_SMBIOS_CC_WW = 2,
> +};

In the pending branch I did some whitespace cleanup in this and the
following struct.

> +
>  struct ath11k_smbios_bdf {
>  	struct dmi_header hdr;
> -	u32 padding;
> +	u8 features_disabled;
> +	/* enum ath11k_smbios_cc_type */
> +	u8 country_code_flag;
> +	/* To set specific country, you need to set country code
> +	 * flag=ATH11K_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 = ATH11K_SMBIOS_CC_WW, then you can use
> +	 * worldwide regulatory setting.
> +	 */
> +	__le16 cc_code;
>  	u8 bdf_enabled;
>  	u8 bdf_ext[];
> -};
> +} __packed;

Is cc_code really in little endian? I would expect data in smbios to be
in native endian (ie. u16), bios using different endian than the host
sounds strange to me. And struct dmi_header also uses native endian:

struct dmi_header {
	u8 type;
	u8 length;
	u16 handle;
} __packed;

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