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

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Message-Id: <71123002-4772-4BDC-BFEF-4C520F4459FE@holtmann.org>
Date:   Mon, 11 Mar 2019 17:38:51 +0100
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Sean Wang <sean.wang@...iatek.com>
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

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:

  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.

Regards

Marcel