RE: Bus Reset
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From: Mark K. <mk...@co...> - 2000-04-12 16:44:01
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The Port Status Registers of a 1394a Phy provide the following indications: Connected - Is the cable attached to another 1394 device? Bias - Is that device providing TPBIAS? Disabled - Is this port of our Phy enabled or disabled? The use of these bits was envisioned as providing the information necessary to answer the questions you posed Jeff. I am unclear whether the Linux 1394 driver is taking advantage of these features at this time. It is possible that another thread having to do with the Sony OHCI implementation may be impacted by the state of these bits also. Cheers -----Original Message----- From: Jeff Mak [mailto:Jef...@ef...] Sent: Tuesday, April 11, 2000 5:01 PM To: 'lin...@li...' Subject: Bus Reset For OHCI driver, whenever the target node is power off, bus reset would be generated. For IEEE1394, there are some power management i.e. the node is self-powered and this has been implemented in my target node. However, the bus reset signal is still generated causing my linux box cannot communicate with the target node anymore. My question is how to distinguish a target node from "power off" to "connection failed" i.e no bus reset would generate under "power off" connection ? Thanks, Jeff |