Messages in this thread | | | Date | Mon, 05 Feb 2007 16:19:28 -0500 | From | Jeff Garzik <> | Subject | Re: hdparm for lib_pata |
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Alan wrote: >> Userspace PIO mode changes are NOT a good idea, > > I would disagree there, but they are not high priority. We do need to > allow set_features/xfer but we need to snoop it and mode set properly > around it. There are cases you want to control this, more so admittedly > for DMA speeds.
*Bingo*
That's the entire reason why libata does not support hdparm changing modes, etc.: there is a lot involved in allowing random SET FEATURES - XFER MODE commands from userspace. In some cases you have to stop all traffic on ports B,C,D,... in order to change the speed on port A.
Jeff
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