[PATCH 2/3] drm/i915: Always set HUC_LOADING_AGENT_GUC bit in WOPCM offset register

[Jackie Li]

The enable_guc modparam is used to enable/disable GuC/HuC FW during module
loading. if WOPCM offset register was locked without HUC_LOADING_AGENT_GUC
bit set to 1 when loading module with only GuC. the reloading module with
both GuC and HuC would fail.

Since HUC_LOADING_AGENT_GUC has no impact on GuC FW loading, this patch
update the register updating code to make sure the WOPCM offset register is
locked with HUC_LOADING_AGENT_GUC bit set to 1 no matter whether HuC FW is
enabled or not.

Signed-off-by: Jackie Li <yaodong.li at intel.com>
---
 drivers/gpu/drm/i915/intel_wopcm.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_wopcm.c b/drivers/gpu/drm/i915/intel_wopcm.c
index 4117886..babb158 100644
--- a/drivers/gpu/drm/i915/intel_wopcm.c
+++ b/drivers/gpu/drm/i915/intel_wopcm.c
@@ -236,8 +236,6 @@ static inline int write_and_verify(struct drm_i915_private *dev_priv,
 int intel_wopcm_init_hw(struct intel_wopcm *wopcm)
 {
 	struct drm_i915_private *dev_priv = wopcm_to_i915(wopcm);
-	u32 huc_agent;
-	u32 mask;
 	int err;
 
 	if (!USES_GUC(dev_priv))
@@ -253,10 +251,10 @@ int intel_wopcm_init_hw(struct intel_wopcm *wopcm)
 	if (err)
 		goto err_out;
 
-	huc_agent = USES_HUC(dev_priv) ? HUC_LOADING_AGENT_GUC : 0;
-	mask = GUC_WOPCM_OFFSET_MASK | GUC_WOPCM_OFFSET_VALID | huc_agent;
 	err = write_and_verify(dev_priv, DMA_GUC_WOPCM_OFFSET,
-			       wopcm->guc.base | huc_agent, mask,
+			       wopcm->guc.base | HUC_LOADING_AGENT_GUC,
+			       GUC_WOPCM_OFFSET_MASK | HUC_LOADING_AGENT_GUC |
+			       GUC_WOPCM_OFFSET_VALID,
 			       GUC_WOPCM_OFFSET_VALID);
 	if (err)
 		goto err_out;
-- 
2.7.4