* [Bug 207843] New: Some ACPI discovered BRCM HCI UART chip write clock failed.
@ 2020-05-22 2:56 bugzilla-daemon
0 siblings, 0 replies; only message in thread
From: bugzilla-daemon @ 2020-05-22 2:56 UTC (permalink / raw)
Bug ID: 207843
Summary: Some ACPI discovered BRCM HCI UART chip write clock
Kernel Version: 5.6.13
Created attachment 289213
>>My tablet uses AP6255 wifi/bluetooth module with BCM43455 chip.
>>The bluetooth controller worked well except bluetooth headset play sound
>>glitch.It's not configuration problem in bluez or pulseaudio.
>>Some log in dmesg indicated that baud rate was not correctly configured.
>>>Bluetooth: BCM: failed to write clock (-56)
>>>Bluetooth: Failed to set baudrate.
>Steps to Reproduce:
>>1. Power on bluetooth headset.
>>2. If it was not automatically connect, connect to headset by bluetoothctl.
>>3. play sound.
>>I suspect the baud rate was too low to transmit audio.
>>It seems the chip can't support write clock HCI command. Then bluetooth
>>driver used default 115200 baud rate.
>>I tried to force configure 4Mbps baud rate to my chip after write clock
>>failed, but reset it failed. Then I hardcode baud rate to 3Mbps, it solved
>>the glitch problem.
>>And I found the commit that introduced the 4Mbsp to ACPI device:
>>It seems not all ACPI discovered devices can support write clock.
>>So maybe the driver should fallback baud rate to 3Mbps if write clock failed.
Smiles ^__________^ zech
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2020-05-22 2:56 [Bug 207843] New: Some ACPI discovered BRCM HCI UART chip write clock failed bugzilla-daemon
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