linux-kernel - Re: [PATCH v1 2/2] Bluetooth: mediatek: add support for MediaTek MT7663S and MT7668S SDIO devices

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Date:   Tue, 12 Mar 2019 05:39:46 +0800
From:   Sean Wang <sean.wang@...iatek.com>
To:     Marcel Holtmann <marcel@...tmann.org>
CC:     Johan Hedberg <johan.hedberg@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        "open list:BLUETOOTH DRIVERS" <linux-bluetooth@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <linux-mmc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 2/2] Bluetooth: mediatek: add support for MediaTek
 MT7663S and MT7668S SDIO devices

On Mon, 2019-03-11 at 17:38 +0100, Marcel Holtmann wrote:
> Hi Sean,
> 
> > This adds the support of enabling MT7663S and MT7668S SDIO-based
> > Bluetooth function.
> > 
> > There are quite many differences between MT766[3,8]S and standard
> > Bluetooth SDIO devices such as Type-A and Type-B devices. For example,
> > MT766[3,8]S have its own SDIO registers layout, definition, SDIO packet
> > format, and the specific flow should be programmed on them to complete
> > the device initialization and low power control and so on.
> > 
> > Currently, there are many independent programming sequences from the
> > transport which are exactly the same as the ones in btusb.c about MediaTek
> > support [1] and btmtkuart.c. We can try to split the transport independent
> > Bluetooth setups on the advance, place them into the common files and allow
> > varous transport drivers to reuse them in the future.
> > 
> > [1] http://lists.infradead.org/pipermail/linux-mediatek/2019-January/017074.html
> > 
> > Signed-off-by: Sean Wang <sean.wang@...iatek.com>
> > ---
> > drivers/bluetooth/Kconfig     |  11 +
> > drivers/bluetooth/Makefile    |   1 +
> > drivers/bluetooth/btmtksdio.c | 979 ++++++++++++++++++++++++++++++++++
> > 3 files changed, 991 insertions(+)
> > create mode 100644 drivers/bluetooth/btmtksdio.c
> 
> patch has been applied to bluetooth-next tree.
> 
> You also need to send an extra patch providing a fix for this:
> 

Thanks for the reporting. I'll fix it up soon.

>   CC      drivers/bluetooth/btmtksdio.o
> drivers/bluetooth/btmtksdio.c: In function ‘btmtksdio_interrupt’:
> drivers/bluetooth/btmtksdio.c:470:2: warning: ‘old_len’ may be used uninitialized in this function [-Wmaybe-uninitialized]
>   print_hex_dump(KERN_ERR, "err sdio rx: ", DUMP_PREFIX_NONE, 4, 1,
>   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>           old_data, old_len, true);
>           ~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/bluetooth/btmtksdio.c:376:15: note: ‘old_len’ was declared here
>   unsigned int old_len;
>                ^~~~~~~
> drivers/bluetooth/btmtksdio.c:470:2: warning: ‘old_data’ may be used uninitialized in this function [-Wmaybe-uninitialized]
>   print_hex_dump(KERN_ERR, "err sdio rx: ", DUMP_PREFIX_NONE, 4, 1,
>   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>           old_data, old_len, true);
>           ~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/bluetooth/btmtksdio.c:375:17: note: ‘old_data’ was declared here
>   unsigned char *old_data;
>                  ^~~~~~~~
> 
> And can we actually introduce module_sdio_driver similar to module_usb_driver.
> 

Sure, I can add and apply module_sdio_driver on the driver and then see
if Ulf like it.

> Regards
> 
> Marcel
>