[Intel-gfx] [PATCH 1/3] drm/i915/gen9: Initialize intel_state->active_crtcs during WM sanitization

[Matt Roper]

intel_state->active_crtcs is usually only initialized when doing a
modeset.  During our first atomic commit after boot, we're effectively
faking a modeset to sanitize the DDB/wm setup, so ensure that this field
gets initialized before use.

Reported-by: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 658a756..0cd38ca 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3896,9 +3896,18 @@ skl_compute_ddb(struct drm_atomic_state *state)
 	 * pretend that all pipes switched active status so that we'll
 	 * ensure a full DDB recompute.
 	 */
-	if (dev_priv->wm.distrust_bios_wm)
+	if (dev_priv->wm.distrust_bios_wm) {
 		intel_state->active_pipe_changes = ~0;
 
+		/*
+		 * We usually only initialize intel_state->active_crtcs if we
+		 * we're doing a modeset; make sure this field is always
+		 * initialized during the sanitization process that happens
+		 * on the first commit too.
+		 */
+		intel_state->active_crtcs = dev_priv->active_crtcs;
+	}
+
 	/*
 	 * If the modeset changes which CRTC's are active, we need to
 	 * recompute the DDB allocation for *all* active pipes, even
-- 
2.1.4