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 <daniel.thomp...@linaro.org> > Cc: Srinivas Kandagatla <srinivas.kandaga...@gmail.com> > Cc: Maxime Coquelin <maxime.coque...@st.com> > Cc: Patrice Chotard <patrice.chot...@st.com> > Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org> > Cc: Jiri Slaby <jsl...@suse.cz> > Cc: ker...@stlinux.com > Cc: linux-ser...@vger.kernel.org
Acked-by: Peter Griffin <peter.grif...@linaro.org> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
