[Bug 101865] [HSW/IVB] Blank screen after resume with HSW

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101865

--- Comment #12 from nutrinfnon at gmx.com ---
Created attachment 135095
  --> https://bugs.freedesktop.org/attachment.cgi?id=135095&action=edit
test 4.14.0-rc6

Hello,

among the latest S3/S4 patches are:

2017-10-04      drm/i915/cnl: Reprogram DMC firmware after S3/S4 resume
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -2809,6 +2809,9 @@ static void cnl_display_core_init(struct drm_i915_private
*dev_priv, bool resume

        /* 6. Enable DBUF */
        gen9_dbuf_enable(dev_priv);
+
+       if (resume && dev_priv->csr.dmc_payload)
+               intel_csr_load_program(dev_priv);
 }
2017-10-04      drm/i915/cnl: Reprogram DMC firmware after S3/S4 resume
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c
b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 7933d1b..3791c3f 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -2809,6 +2809,9 @@ static void cnl_display_core_init(struct drm_i915_private
*dev_priv, bool resume

        /* 6. Enable DBUF */
        gen9_dbuf_enable(dev_priv);
+
+       if (resume && dev_priv->csr.dmc_payload)
+               intel_csr_load_program(dev_priv);
 }


These patches are already merged in linux-4.14.0-rc6, so I tried it.

My test with 4.14.0-rc6 still shows the presence of the problem, blank screen
after resume.

In attach dmesg output.

Thanks.

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