linux-kernel - Re: [PATCH v8] Bluetooth: btusb: Add support using different nvm for variant WCN6855 controller

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Message-ID: <YTsNh+Y9eTD6id7e@google.com>
Date:   Fri, 10 Sep 2021 00:47:19 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Zijun Hu <zijuhu@...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, tjiang@...eaurora.org
Subject: Re: [PATCH v8] Bluetooth: btusb: Add support using different nvm for
 variant WCN6855 controller

On Fri, Sep 03, 2021 at 12:02:38PM +0800, Zijun Hu wrote:
> From: Tim Jiang <tjiang@...eaurora.org>
> 
> the RF perfermance of wcn6855 soc chip from different foundries will be

as Marcel commented on a previous version: 'perfermence' => 'performance'

> difference, so we should use different nvm to configure them.
> 
> Signed-off-by: Tim Jiang <tjiang@...eaurora.org>

For the third time, you should also add your own 'Signed-off-by' tag, i.e.
'Signed-off-by: Zijun Hu <zijuhu@...eaurora.org>'

If you have any doubts about comments you receive ask for clarification,
just ignoring them generally won't satisfy your reviewers.

> ---
>  drivers/bluetooth/btusb.c | 50 +++++++++++++++++++++++++++++++++++------------
>  1 file changed, 37 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> index 928cbfa4c42d..0f5d2222d624 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -3161,6 +3161,9 @@ 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;
> @@ -3192,6 +3195,7 @@ 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,
> @@ -3346,6 +3350,31 @@ 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,
> +					struct qca_version *ver,
> +					char *variant)

The variant parameter should probably be removed (see coment below), if it is
kept it should be 'const char *'.

> +{
> +	char *sep = (strlen(variant) == 0) ? "" : "_";
> +	u16 board_id = le16_to_cpu(ver->board_id);
> +	u32 rom_version = le32_to_cpu(ver->rom_version);
> +
> +	if (((ver->flag >> 8) & 0xff) == QCA_FLAG_MULTI_NVM) {
> +		/* if boardid equal 0, use default nvm without suffix */

This comment isn't useful, please remove it.

Ok, it was already in btusb_setup_qca_load_nvm(), but still it's a
good opportunity to remove it.

> +		if (board_id == 0x0) {

Just use '0' instead of the single digit hex number.

> +			snprintf(fwname, max_size, "qca/nvm_usb_%08x%s%s.bin",
> +				rom_version, sep, variant);
> +		} else {
> +			snprintf(fwname, max_size, "qca/nvm_usb_%08x%s%s_%04x.bin",
> +				rom_version, sep, variant, board_id);
> +		}
> +	} else {
> +		snprintf(fwname, max_size, "qca/nvm_usb_%08x.bin",
> +			rom_version);
> +	}
> +

delete empty line

> +}
> +
>  static int btusb_setup_qca_load_nvm(struct hci_dev *hdev,
>  				    struct qca_version *ver,
>  				    const struct qca_device_info *info)
> @@ -3354,19 +3383,14 @@ 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));
> +	switch (ver->ram_version) {
> +	case WCN6855_2_0_RAM_VERSION_GF:
> +	case WCN6855_2_1_RAM_VERSION_GF:
> +			btusb_generate_qca_nvm_name(fwname, sizeof(fwname), ver, "gf");
> +		break;
> +	default:
> +			btusb_generate_qca_nvm_name(fwname, sizeof(fwname), ver, "");
> +		break;

Actually it would make more sense to have the above switch statement in
btusb_generate_qca_nvm_name(), rather than passing the variant string.