Messages in this thread | | | Date | Tue, 5 May 2009 12:57:21 +0300 | From | Jarkko Lavinen <> | Subject | Re: [PATCH] OMAP: HSMMC: Do not enable buffer ready interrupt if using DMA |
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On Tue, Apr 21, 2009 at 09:39:22AM +0200, ext Gadiyar, Anand wrote: > From: Anand Gadiyar <gadiyar@ti.com> > > 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
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