tree a22697805e4aa021c311bed1d8db250c8b8f8341
parent ce0e0713a6b21ec611d4a2eb5c60d18dbb4bf479
author Ville Syrjälä <ville.syrjala@linux.intel.com> 1386251497 +0200
committer Daniel Vetter <daniel.vetter@ffwll.ch> 1387282676 +0100

drm/i915: Disable LP1+ watermarks safely in init

ILK doesn't like if we just write the LP1+ watermarks registers with 0.
We need to just disable the watermarks by clearing the enable bit. Use
that method also when disabling LP1+ watermarks in init_clock_gating.

It looks like disabling the sprite LP1 watermarks can cause underruns
even if we just toggle the WM1S_LP_EN bit. So treat that bit like the
actual watermark numbers and avoid setting it to 0 immediately.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>