[Intel-gfx] [PATCH 06/11] drm/i915/icl: WaAllowUMDToModifyHalfSliceChicken2

[Oscar Mateo]

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
v4: Rebased on top of whitelist reg refactoring (Michel)
v5: Added References (Mika)

References: HSDES#1804860039
Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Signed-off-by: Oscar Mateo <oscar.mateo at intel.com>
---
 drivers/gpu/drm/i915/intel_workarounds.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_workarounds.c b/drivers/gpu/drm/i915/intel_workarounds.c
index 804de04..e173e17 100644
--- a/drivers/gpu/drm/i915/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/intel_workarounds.c
@@ -965,6 +965,9 @@ static void icl_whitelist_build(struct whitelist *w)
 {
 	/* WaSendPushConstantsFromMMIO:icl */
 	whitelist_reg(w, COMMON_SLICE_CHICKEN2);
+
+	/* WaAllowUMDToModifyHalfSliceChicken2:icl */
+	whitelist_reg(w, HALF_SLICE_CHICKEN2);
 }
 
 static struct whitelist *whitelist_build(struct intel_engine_cs *engine,
-- 
1.9.1