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>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index f5a3c1e..c1ac8ae 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13453,7 +13453,7 @@
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;
/*