On Fri, Dec 16, 2011 at 12:04 AM, Paul Walmsley <paul@xxxxxxxxx> wrote: > > The HSMMC1/HSMMC2 host controllers on OMAP34xx and > OMAP3503/3515/3525/3530 chips at ES levels prior to 3.0 can't do multiple > block reads[1]. Mark the hwmod data appropriately. > > Reported by Dave Hylands <dhylands@xxxxxxxxx> and Steve Sakoman > <sakoman@xxxxxxxxx>. Thanks to Steve Sakoman for further help > testing this patch. > > 1. See for example Advisory 2.1.1.128 "MMC: Multiple Block Read > Operation Issue" in _OMAP3530/3525/3515/3503 Silicon Errata_ > Revision F (October 2010) (SPRZ278F), available from > http://focus.ti.com/lit/er/sprz278f/sprz278f.pdf > > Signed-off-by: Paul Walmsley <paul@xxxxxxxxx> > Cc: Dave Hylands <dhylands@xxxxxxxxx> > Cc: Steve Sakoman <sakoman@xxxxxxxxx> > --- > > The first version of this patch caused MMC hwmods to not be registered on > 36xx/37xx chips. Thanks to Steve Sakoman for noting this. This version > fixes it - tested on 37xx BeagleBoard. I tested this on multiple different processor versions: OMAP3503-GP ES2.1 OMAP3503-GP ES3.1 OMAP3530-GP ES3.1 OMAP3730-GP ES1.0 OMAP3730-GP ES1.2 All worked as expected, multi-block reads were enabled for all except OMAP3503-GP ES2.1, which displayed: omap_hsmmc omap_hsmmc.0: multiblock reads disabled due to 35xx erratum 2.1.1.128; MMC read performance may suffer Thanks, Paul! Tested-by: Steve Sakoman <steve@xxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
