Bug 193671 - btattach -B /dev/ttyS1 -P qca -> Frame reassembly failed (-84)
Summary: btattach -B /dev/ttyS1 -P qca -> Frame reassembly failed (-84)
Status: NEW
Alias: None
Product: Drivers
Classification: Unclassified
Component: Bluetooth (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: linux-bluetooth@vger.kernel.org
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2017-01-30 16:15 UTC by Dmitry
Modified: 2017-01-30 16:17 UTC (History)
1 user (show)

See Also:
Kernel Version: <4.9.*,4.10-rc6
Subsystem:
Regression: No
Bisected commit-id:

Attachments
ACPI BT part (1.79 KB, text/plain)
2017-01-30 16:15 UTC, Dmitry 		Details
Add an attachment (proposed patch, testcase, etc.)

Description Dmitry 2017-01-30 16:15:08 UTC 
Created attachment 253591 [details]
ACPI BT part

Dell Venue 11 Pro has Dell Wireless 1538, which is QCA6234 SIP module. WiFi works, but Bluetooth doesn't. It is recognized by kernel:
80860F0A:00: ttyS1 at MMIO 0x9094d000 (irq = 183, base_baud = 2764800) is a 16550A
But then, doing `btattach -B /dev/ttyS1 -P qca` gives this:
ROME setup
Set UART speed to 3000000
Frame reassembly failed (-84)
hci1 command 0xfc00 tx timeout
Failed to read version of ROME (-110)
Failed to get version 0xffffff92

ACPI says that it uses 115200 speed, but bt QCA protocol tries 3000000. Windows drivers mention 115200 as initial speed as well.
Also after btattach number of interrupts rises and is claimed by serial:
183:          2          1          0          0   IO-APIC   39-fasteoi   serial
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