Gerd Hoffmann [off-list ref] writes:

We need to enable this controller so that we can switch the SD card's
pinmux over to it by default, which will improve storage performance.

Read access (dd with 64k blocks on rpi2):
  CONFIG_MMC_SDHCI_IPROC: 11-12 MB/s
  CONFIG_MMC_BCM2835:     19-20 MB/s

Differences on write access are pretty much in the noise.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

Now that the driver has been merged, I've merged the platform patches up
to this point.

Unfortunately, sending PRs to arm-soc that merge in branches from other
trees has failed in the past, so I won't be able to merge 6 and 7 for
4.12.  That said, it's a whole lot less that the various downstream
kernels will need to pull for the Pi3 than they've been carrying around
until now :)
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