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[10/22] drm/i915/icl: WaAllowUMDToModifyHalfSliceChicken2

Message ID 1523053518-20827-10-git-send-email-oscar.mateo@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

oscar.mateo@intel.com April 6, 2018, 10:25 p.m. UTC
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 (??!!)

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

diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index 884df09..ada80c1 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1500,6 +1500,11 @@  static int icl_init_workarounds(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;
 }