Is that patch included in Manjaro already, or do we have to wait?
I found a article about it on Phoronix.
There was a bit of misunderstanding regarding that patch.
The patch was submitted by @tsys and was resubmitted as a version 2 a day or two later.
What the patch will do is increase the speed of which the controller can read eMMC cards, not SD cards.
So it will only affect you, if you use an eMMC to SD adapter in your Raspberry Pi (which I feel is not really that likely to be common). 
@tsys can corrrect me, if I misunderstood something myself.
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