linux-kernel - Re: [PATCH v5 4/7] Bluetooth: Add new quirk for non-persistent setup settings

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Date:   Tue, 17 Jul 2018 00:05:14 +0800
From:   Sean Wang <sean.wang@...iatek.com>
To:     Marcel Holtmann <marcel@...tmann.org>
CC:     <mark.rutland@....com>, <devicetree@...r.kernel.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        <linux-kernel@...r.kernel.org>, <linux-bluetooth@...r.kernel.org>,
        <robh+dt@...nel.org>, <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5 4/7] Bluetooth: Add new quirk for non-persistent
 setup settings

On Mon, 2018-07-16 at 14:56 +0200, Marcel Holtmann wrote:
> Hi Sean,
> 
> >>> Add a new quirk HCI_QUIRK_NON_PERSISTENT_SETUP allowing that a quirk that
> >>> runs setup() after every open() and not just after the first open().
> >>> 
> >>> Signed-off-by: Sean Wang <sean.wang@...iatek.com>
> >>> ---
> >>> include/net/bluetooth/hci.h | 9 +++++++++
> >>> net/bluetooth/hci_core.c    | 3 ++-
> >>> 2 files changed, 11 insertions(+), 1 deletion(-)
> >>> 
> >>> diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
> >>> index 73e48be..d3ec5b2a8 100644
> >>> --- a/include/net/bluetooth/hci.h
> >>> +++ b/include/net/bluetooth/hci.h
> >>> @@ -183,6 +183,15 @@ enum {
> >>> 	 * during the hdev->setup vendor callback.
> >>> 	 */
> >>> 	HCI_QUIRK_NON_PERSISTENT_DIAG,
> >>> +
> >>> +	/* When this quirk is set, setup() would be run after every
> >>> +	 * open() and not just after the first open().
> >>> +	 *
> >>> +	 * This quirk can be set before hci_register_dev is called or
> >>> +	 * during the hdev->setup vendor callback.
> >>> +	 *
> >>> +	 */
> >>> +	HCI_QUIRK_NON_PERSISTENT_SETUP,
> >>> };
> >>> 
> >>> /* HCI device flags */
> >>> diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
> >>> index f5c21004..0111280 100644
> >>> --- a/net/bluetooth/hci_core.c
> >>> +++ b/net/bluetooth/hci_core.c
> >>> @@ -1396,7 +1396,8 @@ static int hci_dev_do_open(struct hci_dev *hdev)
> >>> 	atomic_set(&hdev->cmd_cnt, 1);
> >>> 	set_bit(HCI_INIT, &hdev->flags);
> >>> 
> >>> -	if (hci_dev_test_flag(hdev, HCI_SETUP)) {
> >>> +	if (hci_dev_test_flag(hdev, HCI_SETUP) ||
> >>> +	    test_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks)) {
> >>> 		hci_sock_dev_event(hdev, HCI_DEV_SETUP);
> >> 
> >> can you include the extract of btmon on how the HCI_DEV_SETUP event shows up in the traces? I remember that I asked about something like that.
> >> 
> >> Regards
> >> 
> >> Marcel
> >> 
> > 
> > No, I cannot see any event about HCI_DEV_SETUP in btmon trace, the trace I posted as below is doing some rounds of power off and then on
> 
> it will result in this:
> 
>         case HCI_DEV_SETUP:
>                 if (hdev->manufacturer == 0xffff)
>                         return NULL;
>                                                                                  
>         case HCI_DEV_UP:
>                 skb = bt_skb_alloc(HCI_MON_INDEX_INFO_SIZE, GFP_ATOMIC);
> 
> So we will see extra index info events, but I assume that is just fine this we also see them on DEV_UP. They also do not hurt as long as not magically the manufacturer information changes.
> 
> I do wonder though if this quirk is set, then hdev->manufacturer needs to be reset and allow hdev->setup() to reset it. This goes with a log of other information as well. Maybe just a look if there are no races here.
> 
> Regards
> 
> Marcel
> 

I didn't set a value to hdev->manufacture.

Should I set it in hdev->setup() ? MediaTek is 0x46 according to [1].

[1]
https://www.bluetooth.com/specifications/assigned-numbers/company-identifiers

> 
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