mirror of
https://github.com/hardkernel/linux.git
synced 2026-06-07 03:15:31 +09:00
24a7ac9d3d
[ Upstream commit 08846522d9a7bccf18d4f97c3f39d03c7a193970 ]
Paragraph "3.4 Power up Timing Sequence" of the AzureWave-CM256SM
datasheet mentions the following about the BT_REG_ON pin, which is
connected to GPIO0_C4_d:
When this pin is low and WL_REG_ON is high,
the BT section is in reset.
Therefor set that pin to GPIO_ACTIVE_HIGH so that it can be pulled low
for a reset.
If set to GPIO_ACTIVE_LOW, the following errors are observed:
Bluetooth: hci0: command 0x0c03 tx timeout
Bluetooth: hci0: BCM: Reset failed (-110)
So fix the GPIO polarity by setting it to ACTIVE_HIGH.
This also matches what other devices with the same BT device have.
Fixes: 2b6a3f857550 ("arm64: dts: rockchip: Fix reset-gpios property on brcm BT nodes")
Signed-off-by: Diederik de Haas <didi.debian@cknow.org>
Link: https://lore.kernel.org/r/20241018145053.11928-2-didi.debian@cknow.org
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.