Required to dinamically set 'Small PL Lossless Fix Enable'

Do Linux UMDs make use of this? This change has been security
reviewed and the whitelisting approved. Virtualization of other
OSes could certainly use it.

v2: For whatever reason, this ended up in KBL (??!!)
v3: Rebased on top of the WA refactoring

Cc: Mika Kuoppala <mika.kuopp...@linux.intel.com>
Signed-off-by: Oscar Mateo <oscar.ma...@intel.com>
---
 drivers/gpu/drm/i915/intel_workarounds.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_workarounds.c 
b/drivers/gpu/drm/i915/intel_workarounds.c
index 970a763..43dbeed 100644
--- a/drivers/gpu/drm/i915/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/intel_workarounds.c
@@ -963,6 +963,11 @@ static int icl_whitelist_workarounds_apply(struct 
intel_engine_cs *engine)
        if (ret)
                return ret;
 
+       /* WaAllowUMDToModifyHalfSliceChicken2:icl */
+       ret = wa_ring_whitelist_reg(engine, HALF_SLICE_CHICKEN2);
+       if (ret)
+               return ret;
+
        return 0;
 }
 
-- 
1.9.1

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