<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [BAT SKL] GPU death starting with first symptom: WARNING backtrace: "DC6 already programmed to be enabled."" href="https://bugs.freedesktop.org/show_bug.cgi?id=93768#c4">Comment # 4</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [BAT SKL] GPU death starting with first symptom: WARNING backtrace: "DC6 already programmed to be enabled."" href="https://bugs.freedesktop.org/show_bug.cgi?id=93768">bug 93768</a> from <a class="email" href="mailto:mika.kuoppala@intel.com" title="Mika Kuoppala <mika.kuoppala@intel.com>"> Mika Kuoppala</a> <pre>(In reply to Chris Wilson from <a href="show_bug.cgi?id=93768#c2">comment #2</a>) > diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c > b/drivers/gpu/drm/i915/inte > index bbca527..a90d4d0 100644 > --- a/drivers/gpu/drm/i915/intel_runtime_pm.c > +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c > @@ -497,7 +497,8 @@ static void gen9_set_dc_state(struct drm_i915_private > *dev_p > val &= ~mask; > val |= state; > I915_WRITE(DC_STATE_EN, val); > - POSTING_READ(DC_STATE_EN); > + if (wait_for((I915_READ(DC_STATE_EN) & mask) == state, 500)) > + DRM_ERROR("Timeout whilst enabling DC6\n"); > } > > void bxt_enable_dc9(struct drm_i915_private *dev_priv) Indeed something goes wrong around here. Sometimes when we disable, DC6 stays disabled for only short amount of time (and/or few reads) but it pops back up as enabled. Thats still a mystery. But what happens next is that we have DC6 ON and we try to reset, and apparently the resetting while on dc6 doesn't lead to success.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>