Re: [Bluez-devel] Hardware Error event patch

[Marcel Holtmann <marcel@holtmann.org>]

Hi Steven,

> > I've finished the patch for handling the Hardware Error event and you have
> > it attached below.
> > 
> > To briefly remind the context: when H4 (HCI over UART) is used
> > as the transport layer between the host and the Bluetooth controller
> > and the controller detects a loss of synchronization, it sends a
> > "Hardware Error" event to the host, which should then send a "Reset"
> > command for resynchronization. The procedure is described under "Error
> > Recovery" in the H:4 appendix of Bluetooth v1.1 specification.
> 
> Are you resetting for all hardware error events, or just when you think
> that H4 synchronisation has been lost?
> 
> It is true that the spec says that a device will issue a hardware error
> when synchronisation is lost but it doesn't say that that's the only
> reason for a device to issue a hardware error.
> 
> CSR devices, for example, use hardware error code 0xFE to mean that H4
> synchronisation has been lost. Other hardware error events mean other
> things and HCI_Reset is not the appropriate action in all cases. In some
> cases no action is required. In other cases user intervention will be
> needed to clear the error and we'll emit a hardware error on every boot
> until the problem is resolved. A few cases will require a harder reset
> than an HCI_Reset.
> 
> You probably don't want to reset if you receive a hardware error and
> you were not using the H4 host transport.

thanks for the information. You are making a good point here. However
the error code is another weird vendor specific thing in the Bluetooth
specification. Proposals on how to deal with it are very welcome.

Regards

Marcel




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