On Wed, Jun 08, 2011 at 08:21:08AM +0530, Jassi Brar wrote: > On Wed, Jun 8, 2011 at 3:11 AM, Mark Brown > > That's fairly unusual, though - usually DMA controllers seem to support > > chaining requests before they support circular operation, at which point > > unless the hardware is badly misdone you can just chain another buffer, > > giving that buffer's worth of time for the CPU to respond. > While writing PL330 driver, I wasn't able to figure out a way to implement LLI. > Please have a look at the PL330 trm and suggest if we can implement it in a > generic way without considering them special requests. > I know pl080 supports LLI and it's fine. I'm perfectly prepared to believe that there's poorly designed hardware out there (either due to just poor design or deploying a controller in an inappropriate application) that requires us to do things in software; it's just relatively unusual as users tend to run into issues which either can't be resolved or are excessively painful to resolve. -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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