On Tue, Apr 21, 2009 at 09:39:22AM +0200, ext Gadiyar, Anand wrote: > From: Anand Gadiyar <[email protected]> > > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
