drm/i915/gen9: Reject display updates that exceed wm limitations (v2)

If we can't find any valid level 0 watermark values for the requested
atomic transaction, reject the configuration before we try to start
programming the hardware.

v2:
 - Add extra debugging output when we reject level 0 watermarks so that
   we can more easily debug how/why they were rejected.

Cc: Lyude Paul <cpaul@redhat.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1463061971-19638-17-git-send-email-matthew.d.roper@intel.com

1 files changed, 16 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index f9dff5e2e0e7..fcf925b31575 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3306,7 +3306,22 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
 
         if (res_blocks >= ddb_allocation || res_lines > 31) {
                 *enabled = false;
-                return 0;
+
+                /*
+                 * If there are no valid level 0 watermarks, then we can't
+                 * support this display configuration.
+                 */
+                if (level) {
+                        return 0;
+                } else {
+                        DRM_DEBUG_KMS("Requested display configuration exceeds system watermark limitations\n");
+                        DRM_DEBUG_KMS("Plane %d.%d: blocks required = %u/%u, lines required = %u/31\n",
+                                      to_intel_crtc(cstate->base.crtc)->pipe,
+                                      skl_wm_plane_id(to_intel_plane(pstate->plane)),
+                                      res_blocks, ddb_allocation, res_lines);
+
+                        return -EINVAL;
+                }
         }
 
         *out_blocks = res_blocks;