[RFC] drm/i915/firmware: Load GuC and HuC firmware using async work.

[Joseph Garvey]

The DMC firmware is currently being loaded using async work.
We can do the same for the GuC and HuC firmware. Also wait for
the work to finish before the firmware transfer.

Cc: Sagar Kamble <sagar.a.kamble at intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at gmail.com>
CC: Oscar Mateo <oscar.mateo at intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa at intel.com>
Cc: Daniel Vetter <daniel at ffwll.ch>
Signed-off-by: Joseph Garvey <joseph1.garvey at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h |  1 +
 drivers/gpu/drm/i915/intel_uc.c | 12 +++++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 907603c..56998fa 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2167,6 +2167,7 @@ struct drm_i915_private {
 
 	struct intel_huc huc;
 	struct intel_guc guc;
+	struct work_struct uc_load_work;
 
 	struct intel_csr csr;
 
diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index 27e072c..8d40e1d 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -250,12 +250,21 @@ static void fetch_uc_fw(struct drm_i915_private *dev_priv,
 	uc_fw->fetch_status = INTEL_UC_FIRMWARE_FAIL;
 }
 
-void intel_uc_init_fw(struct drm_i915_private *dev_priv)
+static void load_uc_fw_work(struct work_struct *work)
 {
+	struct drm_i915_private *dev_priv;
+
+	dev_priv = container_of(work, typeof(*dev_priv), uc_load_work);
 	fetch_uc_fw(dev_priv, &dev_priv->huc.fw);
 	fetch_uc_fw(dev_priv, &dev_priv->guc.fw);
 }
 
+void intel_uc_init_fw(struct drm_i915_private *dev_priv)
+{
+	INIT_WORK(&dev_priv->uc_load_work, load_uc_fw_work);
+	schedule_work(&dev_priv->uc_load_work);
+}
+
 void intel_uc_fini_fw(struct drm_i915_private *dev_priv)
 {
 	__intel_uc_fw_fini(&dev_priv->guc.fw);
@@ -336,6 +345,7 @@ int intel_uc_init_hw(struct drm_i915_private *dev_priv)
 	if (!i915.enable_guc_loading)
 		return 0;
 
+	flush_work(&dev_priv->uc_load_work);
 	guc_disable_communication(guc);
 	gen9_reset_guc_interrupts(dev_priv);
 
-- 
2.7.4