Stephen Schwarm, CSDP wrote: > > I have not had time to make a formal patch for this but I thought it was > significant enough just to send it out. The problem is on omap systems > that use omap_hsmmc.c to run sd or mmc cards. If the system you are > using has an 8 wire interface, it will only use a one wire interface to > 4 wire cards (eg, sd class 4 and sd class 6). > > In the file driver/mmc/omap_hsmmc.c in the function omap_hsmmc_probe: > at about line 1739 change: > > if (mmc_slot(host).wires >= 8) > mmc->caps |= MMC_CAP_8_BIT_DATA; > else if (mmc_slot(host).wires >= 4) > mmc->caps |= MMC_CAP_4_BIT_DATA; > > to: > > if (mmc_slot(host).wires >= 8) > mmc->caps |= MMC_CAP_8_BIT_DATA; > if (mmc_slot(host).wires >= 4) > mmc->caps |= w; > > just delete the word "else". This sets the MMC_CAP_4_BIT_DATA bit on > interfaces that have 8 wire interfaces. > > We have seen a BIG performance improvement on our systems. > Thanks for reporting this. A similar patch was posted a while ago and is currently marked as "awaiting upstream", although it looks like it got lost again. <https://patchwork.kernel.org/patch/78713/> - Anand -- 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
