On Fri, 8 Jun 2007 11:35:13 -0400 Jeff Garzik <jeff@xxxxxxxxxx> wrote: > On Fri, Jun 08, 2007 at 04:38:04PM +0100, Alan Cox wrote: > > > See a URL I posted earlier in this thread. With dumb ATAPI devices we > > > actually have to wait a bit for BSY to be asserted. Not only at reset, > > > but also for every command > > > > 400nS and the current code correctly accounts for it. > > No, _far_ longer than 400nS. 2ms minimum by the spec, but, > > ATADRVR. blackmagic.html and googling around shows plenty of ATAPI > devices that don't get their shit together for 50-100ms. 400nS is commands. Reset is indeed about 150mS or so if you catch a drive right - eg in the middle of revalidating a dodgy disk. One or two have really weird behaviour in that they take MUCH longer to come out of reset with no media loaded. - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
