linux-kernel - Re: [PATCH] Bluetooth: hci_bcm: Handle specific unknown packets after firmware loading

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Message-Id: <BBB949C2-B1CB-478E-9BBF-E39FCA7271EF@holtmann.org>
Date:   Wed, 5 Dec 2018 22:02:30 +0100
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        Bluez mailing list <linux-bluetooth@...r.kernel.org>,
        linux-kernel@...r.kernel.org, Jonathan Bakker <xc-racer2@...e.ca>
Subject: Re: [PATCH] Bluetooth: hci_bcm: Handle specific unknown packets after
 firmware loading

Hi Pawel,

> The Broadcom controller on aries S5PV210 boards sends out a couple of
> unknown packets after the firmware is loaded.  This will cause
> logging of errors such as:
> 	Bluetooth: hci0: Frame reassembly failed (-84)
> 
> This is probably also the case with other boards, as there are related
> Android userspace patches for custom ROMs such as
> https://review.lineageos.org/#/c/LineageOS/android_system_bt/+/142721/
> Since this appears to be intended behaviour, treated them as diagnostic
> packets.
> 
> Note that this is another variant of commit 01d5e44ace8a 
> ("Bluetooth: hci_bcm: Handle empty packet after firmware loading")
> 
> Signed-off-by: Jonathan Bakker <xc-racer2@...e.ca>
> Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
> ---
> drivers/bluetooth/hci_bcm.c | 32 +++++++++++++++++++++++++++-----
> 1 file changed, 27 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
> index ddbd8c6a0ceb..ae271836dc26 100644
> --- a/drivers/bluetooth/hci_bcm.c
> +++ b/drivers/bluetooth/hci_bcm.c
> @@ -51,6 +51,12 @@
> #define BCM_LM_DIAG_PKT 0x07
> #define BCM_LM_DIAG_SIZE 63
> 
> +#define BCM_UNKNOWN_PKT 0x31
> +#define BCM_UNKNOWN_SIZE 0
> +
> +#define BCM_UNKNOWN2_PKT 0x34
> +#define BCM_UNKNOWN2_SIZE 0
> +

lets use BCM_TYPE49_ and BCM_TYPE52_

> #define BCM_AUTOSUSPEND_DELAY	5000 /* default autosleep delay */
> 
> /**
> @@ -561,12 +567,28 @@ static int bcm_setup(struct hci_uart *hu)
> 	.lsize = 0, \
> 	.maxlen = BCM_NULL_SIZE
> 
> +#define BCM_RECV_UNKNOWN \
> +	.type = BCM_UNKNOWN_PKT, \
> +	.hlen = BCM_UNKNOWN_SIZE, \
> +	.loff = 0, \
> +	.lsize = 0, \
> +	.maxlen = BCM_UNKNOWN_SIZE
> +
> +#define BCM_RECV_UNKNOWN2 \
> +	.type = BCM_UNKNOWN2_PKT, \
> +	.hlen = BCM_UNKNOWN2_SIZE, \
> +	.loff = 0, \
> +	.lsize = 0, \
> +	.maxlen = BCM_UNKNOWN2_SIZE

Same here, BCM_RECV_TYPE49 and BCM_RECV_TYPE52.

> +
> static const struct h4_recv_pkt bcm_recv_pkts[] = {
> -	{ H4_RECV_ACL,      .recv = hci_recv_frame },
> -	{ H4_RECV_SCO,      .recv = hci_recv_frame },
> -	{ H4_RECV_EVENT,    .recv = hci_recv_frame },
> -	{ BCM_RECV_LM_DIAG, .recv = hci_recv_diag  },
> -	{ BCM_RECV_NULL,    .recv = hci_recv_diag  },
> +	{ H4_RECV_ACL,       .recv = hci_recv_frame },
> +	{ H4_RECV_SCO,       .recv = hci_recv_frame },
> +	{ H4_RECV_EVENT,     .recv = hci_recv_frame },
> +	{ BCM_RECV_LM_DIAG,  .recv = hci_recv_diag  },
> +	{ BCM_RECV_NULL,     .recv = hci_recv_diag  },
> +	{ BCM_RECV_UNKNOWN,  .recv = hci_recv_diag  },
> +	{ BCM_RECV_UNKNOWN2, .recv = hci_recv_diag  },
> };
> 
> static int bcm_recv(struct hci_uart *hu, const void *data, int count)

Regards

Marcel