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drm/i915/skl: Assume no scaling is available when things are not as expected 

Cdclk < crtc_clock is not allowed and suggests a different problem
elsewhere in the code.

It is more robust and safe to assume no scaling is possible in
this case with no other downsides since it will also WARN_ON_ONCE
so that this definitely gets noticed.

Call it an assert to help new platform bring-up in simulation.

v2: Better commit msg and use WARN_ON_ONCE to signify the unexpectedness.

v3: Move zero crtc_clock check under the warn. (Ville)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Tvrtko Ursulin 2015-10-20 17:17:07 +01:00 committed by Daniel Vetter
parent c73666f394
commit 54bf1ce633
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/intel_display.c
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@ -13453,7 +13453,7 @@ skl_max_scale(struct intel_crtc *intel_crtc, struct intel_crtc_state *crtc_state
crtc_clock = crtc_state->base.adjusted_mode.crtc_clock;
cdclk = to_intel_atomic_state(crtc_state->base.state)->cdclk;
if (!crtc_clock || !cdclk)
if (WARN_ON_ONCE(!crtc_clock || cdclk < crtc_clock))
return DRM_PLANE_HELPER_NO_SCALING;
/*