From 54bf1ce633f6649b1f3682c25712b9e42acb174b Mon Sep 17 00:00:00 2001 From: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Date: Tue, 20 Oct 2015 17:17:07 +0100 Subject: [PATCH] drm/i915/skl: Assume no scaling is available when things are not as expected MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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> --- drivers/gpu/drm/i915/intel_display.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index f5a3c1e25db9..c1ac8ae69541 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -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; /* -- GitLab