Can you please send your patch to upstream mailing list?
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https://bugs.launchpad.net/bugs/1924741
Title:
Load Broadcom firmware for Dell Bluetooth device [413c:8197]
Status in linux package in Ubuntu:
Confirmed
Bug description:
The Broadcom Bluetooth kernel module supports loading patches for
specific hardware devices. Which devices require patchram support is
defined in an array of structs in the kernel module `btusb`, which
allow matching by Vendor ID and, optionally, Product ID.
The Dell-branded device `413c:8197` requires the patch
`BCM20702A1-413c-8197.hcd`[1] to be loaded in order for HSP/HFP
functionality to work (A2DP and AVRCP work without the patch).
However, the patch is not sought for this device by `btusb`.
In 2011, `413c:8197` was included in the module[2], but not marked as
requiring patchram. Later, in 2017, a blanket entry was added for all
Dell-branded (`413c`) devices[3], marking them as requiring patchram.
However, the previous entry for `413c:8197` was not removed and
appears to block the patchram requirement from being added for this
device (presumably the algorithm stops searching after the first
match). The code stands like so:
```
static const struct usb_device_id btusb_table[] = {
...
/* Broadcom BCM20702A0 */
{ USB_DEVICE(0x413c, 0x8197) },
...
/* Dell Computer - Broadcom based */
{ USB_VENDOR_AND_INTERFACE_INFO(0x413c, 0xff, 0x01, 0x01),
.driver_info = BTUSB_BCM_PATCHRAM },
```
I would like to request removal of the earlier entry to facilitate
patchram support for device `413c:8197`.
I have tested this as working on my Dell Precision M6700 running
Ubuntu 20.04 with kernel `5.4.0-71-generic`.
[1]:
https://github.com/winterheart/broadcom-bt-firmware/blob/master/brcm/BCM20702A1-413c-8197.hcd
[2]:
https://github.com/torvalds/linux/commit/d13431ca3eb2a2c14314f04813cdc11cd869f150
[3]:
https://github.com/torvalds/linux/commit/fdfddc601713d4ed564b0bd25b29415bd622020a
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