The NPLL is the only safe way to generate 500 MHz for the GPU. The
downstream Chrome OS 3.14 kernel ('official' kernel for veyron
devices) re-purposes NPLL to HDMI and hence disables the OPP for
the GPU (see https://crrev.com/c/1574579). Disable it here as well
to keep in sync and avoid problems in case someone decides to
re-purpose NPLL.
Signed-off-by: NMatthias Kaehlcke <mka@chromium.org>
Reviewed-by: NDouglas Anderson <dianders@chromium.org>
[moved from veyron to general rk3288, as tying up the NPLL for a
 not-that-helpful opp (not really fast but will still generate
 quite a bit of heat) doesn't make so much sense when it will
 keep us from supporting other display modes  in the future]
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>