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drm/i915: Disable FBC WM on ILK, and disable LP2+ when FBC is enabled 

ILK has a bunch of issues with FBC. First of all, BSpec tells us that
FBC WM should never be enabled. Secondly when FBC is enabled
with FBC WM disabled, LP2+ watermarks must be disabled.

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>
This commit is contained in:
Ville Syrjälä 2013-12-05 15:51:35 +02:00 committed by Daniel Vetter
parent 0ba22e26fe
commit 6c8b6c2887
1 changed files with 16 additions and 1 deletions
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17
drivers/gpu/drm/i915/intel_pm.c
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@ -2701,7 +2701,8 @@ static void ilk_wm_merge(struct drm_device *dev,
config->num_pipes_active > 1)
return;
merged->fbc_wm_enabled = true;
/* ILK: FBC WM must be disabled always */
merged->fbc_wm_enabled = INTEL_INFO(dev)->gen >= 6;
/* merge each WM1+ level */
for (level = 1; level <= max_level; level++) {
@ -2721,6 +2722,20 @@ static void ilk_wm_merge(struct drm_device *dev,
wm->fbc_val = 0;
}
}
/* ILK: LP2+ must be disabled when FBC WM is disabled but FBC enabled */
/*
* FIXME this is racy. FBC might get enabled later.
* What we should check here is whether FBC can be
* enabled sometime later.
*/
if (IS_GEN5(dev) && !merged->fbc_wm_enabled && intel_fbc_enabled(dev)) {
for (level = 2; level <= max_level; level++) {
struct intel_wm_level *wm = &merged->wm[level];
wm->enable = false;
}
}
}
static int ilk_wm_lp_to_level(int wm_lp, const struct intel_pipe_wm *pipe_wm)