[Bug 216817] btusb device with ID 0489:e0d0 no longer working after v6.0

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216817

Luiz Von Dentz (luiz.dentz@gmail.com) changed:

           What    |Removed                     |Added
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                 CC|                            |luiz.dentz@gmail.com

--- Comment #4 from Luiz Von Dentz (luiz.dentz@gmail.com) ---
Looks like the command that is failing is HCI_OP_LE_READ_BUFFER_SIZE_V2:

#define HCI_OP_LE_READ_BUFFER_SIZE_V2   0x2060

Looks like the controller is marking as supported but in fact it doesn't:

        /* Use Read LE Buffer Size V2 if supported */
        if (hdev->commands[41] & 0x20)
                return __hci_cmd_sync_status(hdev,
                                             HCI_OP_LE_READ_BUFFER_SIZE_V2,
                                             0, NULL, HCI_CMD_TIMEOUT);

So either we introduce a quirk that must be set by the driver or we fallback to
HCI_OP_LE_READ_BUFFER_SIZE if HCI_OP_LE_READ_BUFFER_SIZE_V2 is not supported,
the later perhaps save us more time detecting this broken behavior since some
manufacturers don't seem to even care to qualify their controllers.

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