[Bug 103484] SSEU status is all 0 on BXT

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103484

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
Oh hum:

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
b/drivers/gpu/drm/i915/i915_debugfs.c
index daf7a16a4ee2..53f01a87673e 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4587,6 +4587,7 @@ static int i915_sseu_status(struct seq_file *m, void
*unused)
        memset(&sseu, 0, sizeof(sseu));

        intel_runtime_pm_get(dev_priv);
+       intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);

        if (IS_CHERRYVIEW(dev_priv)) {
                cherryview_sseu_device_status(dev_priv, &sseu);
@@ -4596,6 +4597,7 @@ static int i915_sseu_status(struct seq_file *m, void
*unused)
                gen9_sseu_device_status(dev_priv, &sseu);
        }

+       intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
        intel_runtime_pm_put(dev_priv);

        i915_print_sseu_info(m, false, &sseu);

So while the registers may not need fw for read; the device does need to be
awake for the eu to be ungated.

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