Re: [PATCH linux-next v4 5/5] mtd: atmel-quadspi: add driver for Atmel QSPI controller
From: Russell King - ARM Linux
Date: Mon Aug 24 2015 - 08:49:59 EST
On Mon, Aug 24, 2015 at 01:03:51PM +0200, Marek Vasut wrote:
> These are functions, not macros :)
> btw is there any reason for these ? I'd say, just put the read*() and
> write*() functions directly into the code and be done with it, it is
> much less confusing.
> Also, why do you use the _relaxed() versions of the functions ?
Now that the _relaxed() accessors are available throughout the kernel,
everyone should be using the _relaxed() versions unless they need the
properties of the non-relaxed versions. Remember that the non-relaxed
versions are rather expensive on ARM due to the need to go all the way
out to the L2 cache - it at least doubles the number of accesses for
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.
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