On Wed, Jan 6, 2010 at 6:46 PM, Adrian Hunter <adrian.hunter@xxxxxxxxx> wrote: > Venkatraman S wrote: >> >> On Tue, Dec 29, 2009 at 3:18 AM, Tony Lindgren <tony@xxxxxxxxxxx> wrote: >>> >>> * Venkatraman S <svenkatr@xxxxxx> [091211 07:01]: >>>> >>>> Here is the most updated version of the patch (thanks to Russell's >>>> review). This patch is applicable to OMAP4xxx as well as OMAP3630 >>>> Reference to previous posts >>>> v1 http://marc.info/?l=linux-omap&m=125012097403050&w=2 >>>> v2 http://marc.info/?l=linux-omap&m=125137152606644&w=2 >>>> v3 http://patchwork.kernel.org/patch/45408/ >>> >>> Do you have a patch for drivers/mmc/host/omap_hsmmc.c to >>> use this feature? Or some other driver? >>> >>> Regards, >>> >>> Tony >> >> I am about to start working on omap_hsmmc to use the descriptor load >> feature. If the DMA changes are acceptable, I can post the driver >> patch as well. > > I presume this is about performance. How does it compare to chained DMA? > We have a patch for omap_hsmmc for chained DMA that we are still testing. > The main difference would be the number of logical channels used. With chaining, I assume you'd request for (or the API internally reserves) as many logical channels as there are segments. Here a single logical channel would do. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
