[Intel-gfx] [PATCH] drm/i915/skl: Assume no scaling is available when things are not as expected

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

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

It is more robust and safe to assume no scaling is possible in this case.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 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 93a5e51..4c99373 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13234,7 +13234,7 @@ skl_max_scale(struct intel_crtc *intel_crtc, struct intel_crtc_state *crtc_state
 	crtc_clock = crtc_state->base.adjusted_mode.crtc_clock;
 	cdclk = dev_priv->display.get_display_clock_speed(dev);
 
-	if (!crtc_clock || !cdclk)
+	if (!crtc_clock || !cdclk || (cdclk < crtc_clock))
 		return DRM_PLANE_HELPER_NO_SCALING;
 
 	/*
-- 
2.4.0