drm/i915/guc: skip disabling CTBs before sanitizing the GuC

If we're about to sanitize the GuC, something might have going wrong
beforehand, so we should avoid trying to talk to it. Even if GuC is
still running fine, the sanitize will reset its internal state and clear
the CTB registration, so there is still no need to explicitly do so.

References: https://gitlab.freedesktop.org/drm/intel/-/issues/2469
Signed-off-by: Daniele Ceraolo Spurio <[email protected]>
Signed-off-by: Matthew Brost <[email protected]>
Reviewed-by: Matthew Brost <[email protected]>
Cc: Michal Wajdeczko <[email protected]>
Cc: John Harrison <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: dceraolo

drivers/gpu/drm/i915/gt/uc/intel_uc.c

@@ -504,7 +504,7 @@ static int __uc_init_hw(struct intel_uc *uc)
 
 	ret = intel_guc_sample_forcewake(guc);
 	if (ret)
-		goto err_communication;
+		goto err_log_capture;
 
 	if (intel_uc_uses_guc_submission(uc))
 		intel_guc_submission_enable(guc);
@@ -529,8 +529,6 @@ static int __uc_init_hw(struct intel_uc *uc)
 	/*
 	 * We've failed to load the firmware :(
 	 */
-err_communication:
-	guc_disable_communication(guc);
 err_log_capture:
 	__uc_capture_load_err_log(uc);
 err_out:
@@ -558,9 +556,6 @@ static void __uc_fini_hw(struct intel_uc *uc)
 	if (intel_uc_uses_guc_submission(uc))
 		intel_guc_submission_disable(guc);
 
-	if (guc_communication_enabled(guc))
-		guc_disable_communication(guc);
-
 	__uc_sanitize(uc);
 }
 
@@ -577,7 +572,6 @@ void intel_uc_reset_prepare(struct intel_uc *uc)
 	if (!intel_guc_is_ready(guc))
 		return;
 
-	guc_disable_communication(guc);
 	__uc_sanitize(uc);
 }