drm/i915/guc: Fix Gen9 GuC loading workarounds

In commit 4502e9ec820d ("drm/i915/uc: Unify firmware loading") we
stopped converting errors detected during firmware transfer into
-EAGAIN and this indirectly killed our workarounds for Gen9 GuC.
Reactivate those workarounds by looking for actual -ETIMEDOUT error.

Testcase: igt@drv_selftest@live_hangcheck
Reported-by: Daniele Ceraolo Spurio <[e-mail]>
References: commit 4502e9ec820d ("drm/i915/uc: Unify firmware loading")

Signed-off-by: Michal Wajdeczko <[e-mail]>
Cc: Daniele Ceraolo Spurio <[e-mail]>
Cc: Chris Wilson <[e-mail]>
Reviewed-by: Daniele Ceraolo Spurio <[e-mail]>
Signed-off-by: Chris Wilson <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/i915/intel_uc.c

···
 
 		intel_guc_init_params(guc);
 		ret = intel_guc_fw_upload(guc);
-		if (ret == 0 || ret != -EAGAIN)
+		if (ret == 0 || ret != -ETIMEDOUT)
 			break;
 
 		DRM_DEBUG_DRIVER("GuC fw load failed: %d; will reset and "