simple sd card performance bug fix on OMAP

[Stephen Schwarm, CSDP]

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.

Steve Schwarm


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