When coming out of S3/S4 we sanitize and re-init the HW, which includes
enabling communication during uc_init_hw. We therefore don't want to do
that again in uc_resume and can just tell GuC to reload its state.
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Cc: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/gt/uc/intel_uc.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc.c b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
index fafa9be1e12a..34706a753793 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
@@ -233,11 +233,18 @@ static void guc_disable_interrupts(struct intel_guc *guc)
guc->interrupts.disable(guc);
}
+static bool guc_communication_enabled(struct intel_guc *guc)
+{
+ return guc->send != intel_guc_send_nop;
+}
+
static int guc_enable_communication(struct intel_guc *guc)
{
struct drm_i915_private *i915 = guc_to_gt(guc)->i915;
int ret;
+ GEM_BUG_ON(guc_communication_enabled(guc));
+
ret = intel_guc_ct_enable(&guc->ct);
if (ret)
return ret;
@@ -558,7 +565,14 @@ int intel_uc_resume(struct intel_uc *uc)
if (!intel_guc_is_running(guc))
return 0;
- guc_enable_communication(guc);
+ /*
+ * When coming out of S3/S4 we sanitize and re-init the HW, so
+ * communication is already re-enabled at this point and we just need
+ * to tell GuC to reload its internal state. During runtime resume we
+ * instead want to re-init everything.
+ */
+ if (!guc_communication_enabled(guc))
+ guc_enable_communication(guc);
err = intel_guc_resume(guc);
if (err) {
--
2.22.0
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