On Fri, May 22, 2009, Gadiyar, Anand wrote: > On Wed, May 06, 2009, Gadiyar, Anand wrote: > > On Tue, May 5, 2009, Jarkko Lavinen wrote: > > > On Tue, Apr 21, 2009 at 09:39:22AM +0200, ext Gadiyar, Anand wrote: > > > > From: Anand Gadiyar <gadiyar@xxxxxx> > > > > > > > > OMAP: HSMMC: Do not enable buffer ready interrupt if using DMA > > > > > > > > This considerably reduces the number of interrupts during a transfer > > > > and ought to result in some power saving. > > > > > > I tried the patch with reading from the raw mmc block device to > > > /dev/null with dd (with bs 32k and 1M). I cannot see any > > > difference in interrupt count from /proc/interrupts or in read > > > speed. At least the patch works. Cpu was 34340es3. > > > > > > I also trid without the patch just disabling the Buffer > > > Read/write Ready bits from INT_EN_MASK which is then written to > > > both MMCHS_IE and MMCHS_ISE. Still no change in read speed nor > > > mmc irq count. > > > > > > Cheers > > > Jarkko Lavinen > > > > I discovered this while doing MMC writes. I did not check if there > > was any difference during a read. I notice you have only tested with > > MMC reads. > > > > Here's what I get with and without the patch. > > > > - Anand > > > Any comments on this? Is it safe to merge? > > Thanks, > Anand <snip> Ping? Patchwork link is: http://patchwork.kernel.org/patch/19133/ -- 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
