On Tue, 02 Sep 2014, Daniel Thompson wrote: > The architectures where this peripheral exists (ARM and SH) have expensive > implementations of writel(), reliant on spin locks and explicit L2 cache > management. These architectures provide a cheaper writel_relaxed() which > is much better suited to peripherals that do not perform DMA. The > situation with readl()/readl_relaxed()is similar although less acute. > > This driver does not use DMA and will be more power efficient and more > robust (due to absense of spin locks during console I/O) if it uses the > relaxed variants. > > This change means the driver is no longer portable and therefore no > longer suitable for compile testing. > > Signed-off-by: Daniel Thompson <[email protected]> > Cc: Srinivas Kandagatla <[email protected]> > Cc: Maxime Coquelin <[email protected]> > Cc: Patrice Chotard <[email protected]> > Cc: Greg Kroah-Hartman <[email protected]> > Cc: Jiri Slaby <[email protected]> > Cc: [email protected] > Cc: [email protected]
Acked-by: Peter Griffin <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
