linux-kernel - Re: [PATCH 2/2] Bluetooth: btqcomsmd: use HCI_QUIRK_USE_BDADDR

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Message-ID: <bff4f1b7d82e217f45273872eeffa77f@codeaurora.org>
Date:   Thu, 25 Oct 2018 20:10:30 +0530
From:   Balakrishna Godavarthi <bgodavar@...eaurora.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Loic Poulain <loic.poulain@...aro.org>,
        linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Brian Norris <briannorris@...omium.org>,
        Dmitry Grinberg <dmitrygr@...gle.com>
Subject: Re: [PATCH 2/2] Bluetooth: btqcomsmd: use
 HCI_QUIRK_USE_BDADDR_PROPERTY

Hi Matthias,

On 2018-10-25 05:51, Matthias Kaehlcke wrote:
> Use the HCI_QUIRK_USE_BDADDR_PROPERTY quirk to let the HCI
> core handle the reading of 'local-bd-address'. With this there
> is no need to set HCI_QUIRK_INVALID_BDADDR, the case of a
> non-existing or invalid fwnode property is handled by the core
> code.
> 
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
> I couldn't actually test the changes in this driver since I
> don't have a device with this controller. Could someone
> from Qualcomm help with this?
> ---
>  drivers/bluetooth/btqcomsmd.c | 28 +++-------------------------
>  1 file changed, 3 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/bluetooth/btqcomsmd.c 
> b/drivers/bluetooth/btqcomsmd.c
> index 7df3eed1ef5e..e5841602c4f1 100644
> --- a/drivers/bluetooth/btqcomsmd.c
> +++ b/drivers/bluetooth/btqcomsmd.c
> @@ -125,23 +125,10 @@ static int btqcomsmd_setup(struct hci_dev *hdev)
>  		return PTR_ERR(skb);
>  	kfree_skb(skb);
> 
> -	/* Devices do not have persistent storage for BD address. If no
> -	 * BD address has been retrieved during probe, mark the device
> -	 * as having an invalid BD address.
> +	/* Devices do not have persistent storage for BD address. Retrieve
> +	 * it from the firmware node property.
>  	 */
> -	if (!bacmp(&btq->bdaddr, BDADDR_ANY)) {
> -		set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
> -		return 0;
> -	}
> -
> -	/* When setting a configured BD address fails, mark the device
> -	 * as having an invalid BD address.
> -	 */
> -	err = qca_set_bdaddr_rome(hdev, &btq->bdaddr);
> -	if (err) {
> -		set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
> -		return 0;
> -	}
> +	set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
> 
>  	return 0;
>  }
> @@ -169,15 +156,6 @@ static int btqcomsmd_probe(struct platform_device 
> *pdev)
>  	if (IS_ERR(btq->cmd_channel))
>  		return PTR_ERR(btq->cmd_channel);
> 
> -	/* The local-bd-address property is usually injected by the
> -	 * bootloader which has access to the allocated BD address.
> -	 */
> -	if (!of_property_read_u8_array(pdev->dev.of_node, "local-bd-address",
> -				       (u8 *)&btq->bdaddr, sizeof(bdaddr_t))) {
> -		dev_info(&pdev->dev, "BD address %pMR retrieved from device-tree",
> -			 &btq->bdaddr);
> -	}
> -
>  	hdev = hci_alloc_dev();
>  	if (!hdev)
>  		return -ENOMEM;

nit: can be remove unused "bdaddr_t bdaddr" variable.
https://elixir.bootlin.com/linux/v4.19-rc8/source/drivers/bluetooth/btqcomsmd.c#L31
Apart from this, It looks ok to me.

Reviewed-by: Balakrishna Godavarthi <bgodavar@...eaurora.org>
-- 
Regards
Balakrishna.