linux-kernel - Re: [PATCH v3] Bluetooth: btusb: Add support for variant WCN6855 by using different nvm

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Date:   Tue, 26 Oct 2021 09:24:32 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     tjiang@...eaurora.org
Cc:     marcel@...tmann.org, johan.hedberg@...il.com, luiz.dentz@...il.com,
        linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, bgodavar@...eaurora.org,
        c-hbandi@...eaurora.org, hemantg@...eaurora.org,
        rjliao@...eaurora.org, zijuhu@...eaurora.org
Subject: Re: [PATCH v3] Bluetooth: btusb: Add support for variant WCN6855 by
 using different nvm

On Fri, Oct 22, 2021 at 01:35:38PM +0800, tjiang@...eaurora.org wrote:
> the RF performance of wcn6855 soc chip from different foundries will be
> difference, so we should use different nvm to configure them.
> 
> Signed-off-by: Tim Jiang <tjiang@...eaurora.org>
> ---
>  drivers/bluetooth/btusb.c | 55
> +++++++++++++++++++++++++++++++++++------------
>  1 file changed, 41 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> index 87b71740fad8..a5fe57e7cd7e 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -3195,6 +3195,9 @@ static int btusb_set_bdaddr_wcn6855(struct hci_dev
> *hdev,
>  #define QCA_DFU_TIMEOUT		3000
>  #define QCA_FLAG_MULTI_NVM      0x80
> 
> +#define WCN6855_2_0_RAM_VERSION_GF 0x400c1200
> +#define WCN6855_2_1_RAM_VERSION_GF 0x400c1211
> +
>  struct qca_version {
>  	__le32	rom_version;
>  	__le32	patch_version;
> @@ -3226,6 +3229,7 @@ static const struct qca_device_info
> qca_devices_table[] = {
>  	{ 0x00000302, 28, 4, 16 }, /* Rome 3.2 */
>  	{ 0x00130100, 40, 4, 16 }, /* WCN6855 1.0 */
>  	{ 0x00130200, 40, 4, 16 }, /* WCN6855 2.0 */
> +	{ 0x00130201, 40, 4, 16 }, /* WCN6855 2.1 */
>  };
> 
>  static int btusb_qca_send_vendor_req(struct usb_device *udev, u8 request,
> @@ -3380,6 +3384,42 @@ static int btusb_setup_qca_load_rampatch(struct
> hci_dev *hdev,
>  	return err;
>  }
> 
> +static void btusb_generate_qca_nvm_name(char *fwname,
> +					size_t max_size,
> +					const struct qca_version *ver)
> +{
> +	u32 rom_version = le32_to_cpu(ver->rom_version);
> +	u16 flag = le16_to_cpu(ver->flag);
> +
> +	if (((flag >> 8) & 0xff) == QCA_FLAG_MULTI_NVM) {
> +		u16 board_id = le16_to_cpu(ver->board_id);
> +		u32 ram_version = le32_to_cpu(ver->ram_version);
> +		const char *variant = NULL;

This assignement was introduced in v3, it isn't really useful since the
variable is always assigned to a value in the switch statement below.

btw, why did you reset the patch version numbers, earlier they went up
to v11? This is confusing, e.g. when someone mentions v3 of this patch,
are they referring to this version or to
https://patchwork.kernel.org/project/bluetooth/patch/1628758216-3201-1-git-send-email-zijuhu@codeaurora.org/?

> +
> +		switch (ram_version) {
> +		case WCN6855_2_0_RAM_VERSION_GF:
> +		case WCN6855_2_1_RAM_VERSION_GF:
> +			variant = "_gf";
> +			break;
> +		default:
> +			variant = "";
> +			break;
> +		}
> +
> +		if (board_id == 0) {
> +			snprintf(fwname, max_size, "qca/nvm_usb_%08x%s.bin",
> +				rom_version, variant);
> +		} else {
> +			snprintf(fwname, max_size, "qca/nvm_usb_%08x%s_%04x.bin",
> +				rom_version, variant, board_id);
> +		}
> +	} else {
> +		snprintf(fwname, max_size, "qca/nvm_usb_%08x.bin",
> +			rom_version);
> +	}
> +
> +}
> +
>  static int btusb_setup_qca_load_nvm(struct hci_dev *hdev,
>  				    struct qca_version *ver,
>  				    const struct qca_device_info *info)
> @@ -3388,20 +3428,7 @@ static int btusb_setup_qca_load_nvm(struct hci_dev
> *hdev,
>  	char fwname[64];
>  	int err;
> 
> -	if (((ver->flag >> 8) & 0xff) == QCA_FLAG_MULTI_NVM) {
> -		/* if boardid equal 0, use default nvm without surfix */
> -		if (le16_to_cpu(ver->board_id) == 0x0) {
> -			snprintf(fwname, sizeof(fwname), "qca/nvm_usb_%08x.bin",
> -				 le32_to_cpu(ver->rom_version));
> -		} else {
> -			snprintf(fwname, sizeof(fwname), "qca/nvm_usb_%08x_%04x.bin",
> -				le32_to_cpu(ver->rom_version),
> -				le16_to_cpu(ver->board_id));
> -		}
> -	} else {
> -		snprintf(fwname, sizeof(fwname), "qca/nvm_usb_%08x.bin",
> -			 le32_to_cpu(ver->rom_version));
> -	}
> +	btusb_generate_qca_nvm_name(fwname, sizeof(fwname), ver);
> 
>  	err = request_firmware(&fw, fwname, &hdev->dev);
>  	if (err) {
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a
> Linux Foundation Collaborative Project