[PATCH v3] Additional debug for watermarks
Stanislav Lisovskiy
stanislav.lisovskiy at intel.com
Tue Nov 6 15:30:17 UTC 2018
Various kms_draw_crc tests fail with crc mismatch assertion.
Noticed that in almost all failure cases, there is no
skl_compute_wm call, while in those which pass, there is.
This issue seems to be extremely hard to reproduce
on a single machine(tried manually on kbl, skl, icl).
So added some traces and start tryboting to figure out
why skl_compute_wm call doesn't happen.
v3: Remove excessive messages, otherwise results in
atomic update failure due to exceeding maximum time window.
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
---
drivers/gpu/drm/i915/intel_display.c | 5 +++++
drivers/gpu/drm/i915/intel_pm.c | 10 ++++++++++
2 files changed, 15 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 31fbf67cb661..5187d6750d0f 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12515,6 +12515,8 @@ static int intel_atomic_check(struct drm_device *dev,
if (ret)
return ret;
+ DRM_DEBUG_KMS("Validating state");
+
for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, crtc_state, i) {
struct intel_crtc_state *pipe_config =
to_intel_crtc_state(crtc_state);
@@ -12568,6 +12570,9 @@ static int intel_atomic_check(struct drm_device *dev,
return ret;
intel_fbc_choose_crtc(dev_priv, intel_state);
+
+ DRM_DEBUG_KMS("Calculating watermarks");
+
return calc_watermark_data(state);
}
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 9da8ff263d36..6bf0f1f4b475 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5097,6 +5097,9 @@ static void skl_ddb_entry_write(struct drm_i915_private *dev_priv,
I915_WRITE(reg, (entry->end - 1) << 16 | entry->start);
else
I915_WRITE(reg, 0);
+
+ if (entry->start && entry->end)
+ DRM_DEBUG_KMS("write ddb %d %d", entry->start, entry->end);
}
static void skl_write_wm_level(struct drm_i915_private *dev_priv,
@@ -5111,6 +5114,9 @@ static void skl_write_wm_level(struct drm_i915_private *dev_priv,
val |= level->plane_res_l << PLANE_WM_LINES_SHIFT;
}
+ if (level->plane_res_b && level->plane_res_l)
+ DRM_DEBUG_KMS("write wm level %d %d", level->plane_res_b, level->plane_res_l);
+
I915_WRITE(reg, val);
}
@@ -5220,6 +5226,8 @@ static int skl_update_pipe_wm(struct drm_crtc_state *cstate,
else
*changed = true;
+ DRM_DEBUG_KMS("Pipe changed %d", *changed);
+
return 0;
}
@@ -5452,6 +5460,8 @@ skl_compute_wm(struct drm_atomic_state *state)
if (ret)
return ret;
+ DRM_DEBUG_KMS("calculating changes");
+
/*
* Calculate WM's for all pipes that are part of this transaction.
* Note that the DDB allocation above may have added more CRTC's that
--
2.17.1
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