From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> commit 7c4541a37bbbf83c0f16f779e85eb61d9348ed29 upstream. Before we return control to the system, and letting it reuse all the pages being accessed by HW, we must disable the HW. At the moment, we dare not reset the GPU if it will clobber the display, but once we know the display has been disabled, we can proceed with the reset as we shutdown the module. We know the next user must reinitialise the HW for their purpose. Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/489 Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Cc: stable@xxxxxxxxxx Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20200525151459.12083-1-chris@xxxxxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/gt/intel_gt.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/gpu/drm/i915/gt/intel_gt.c +++ b/drivers/gpu/drm/i915/gt/intel_gt.c @@ -656,6 +656,11 @@ void intel_gt_driver_unregister(struct i void intel_gt_driver_release(struct intel_gt *gt) { struct i915_address_space *vm; + intel_wakeref_t wakeref; + + /* Scrub all HW state upon release */ + with_intel_runtime_pm(gt->uncore->rpm, wakeref) + __intel_gt_reset(gt, ALL_ENGINES); vm = fetch_and_zero(>->vm); if (vm) /* FIXME being called twice on error paths :( */
