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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - SSEU status is all 0 on BXT"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103484#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - SSEU status is all 0 on BXT"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103484">bug 103484</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>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.</pre>
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