From: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
When computing normal watermarks in vlv_compute_wm(), if the value
is bigger than system limitation, return EINVAL
Signed-off-by: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
Signed-off-by: Chi Ding <chix.d...@intel.com>
---
drivers/gpu/drm/i915/intel_pm.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 3e239af..3fb896a 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -1152,9 +1152,14 @@ static int vlv_compute_wm(struct intel_crtc *crtc)
int wm = vlv_compute_wm_level(plane, crtc, state,
level);
int max_wm = plane->base.type == DRM_PLANE_TYPE_CURSOR
? 63 : 511;
- /* hack */
- if (WARN_ON(level == 0 && wm > max_wm))
- wm = max_wm;
+ if (level == 0 && wm > max_wm) {
+ DRM_DEBUG_KMS("Requested display configuration "
+ "exceeds system watermark limitations\n");
+ DRM_DEBUG_KMS("Plane %d.%d: blocks required =
%u/%u\n",
+ crtc->pipe,
+ drm_plane_index(&plane->base), wm,
max_wm);
+ return -EINVAL;
+ }
if (wm > wm_state->fifo_size[wm_plane_id(plane)])
break;
--
1.8.0.1
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