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Since commit6ca9a2beb5("drm/i915: Unwind i915_gem_init() failure") we believed that we correctly handle all errors encountered during GuC initialization, including special one that indicates request to run driver with disabled GPU submission (-EIO). Unfortunately since commit121981fafe("drm/i915/guc: Combine enable_guc_loading|submission modparams") we stopped using that error code to avoid unwanted fallback to execlist submission mode. In result any GuC initialization failure was treated as non-recoverable error leading to driver load abort, so we could not even read related GuC error log to investigate cause of the problem. For now always return -EIO on any uC hardware related failure. Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20190811195132.9660-5-michal.wajdeczko@intel.com