tree 7b454608c85bb6823384009a90ebe290431f17cf
parent 90bbf4fdf2dc64aa7c20a93a9744c56a566baf26
author Chris Blair <chris.blair@stericsson.com> 1328187574 +0100
committer Grant Likely <grant.likely@secretlab.ca> 1328207536 -0700

spi/pl022: Add high priority message pump support

This switches the PL022 worker to a kthread in order to get
hold of a mechanism to control the message pump priority. On
low-latency systems elevating the message kthread to realtime
priority give a real sleek response curve. This has been
confirmed by measurements. Realtime priority elevation for
a certain PL022 port can be requested from platform data.

Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Chris Blair <chris.blair@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>