[Intel-gfx] [PATCH 14/27] drm/i915/icl: Set graphics mode register for gen11

[Paulo Zanoni]

From: kgardine <kelvin.gardiner at intel.com>

This patch clears a single bit. The bit is 0 by default but expected not to be
set. Explicitly clearing the bit in this patch is intended to indicate some
thinking has occurred, and that we want this bit cleared and we are not just
excepting the default value.

v2 (from Paulo): fix indentation.
v3 (from Paulo): rebase.

Signed-off-by: kgardine <kelvin.gardiner at intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h  |  2 ++
 drivers/gpu/drm/i915/intel_lrc.c | 10 ++++++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index f383ee5cc592..a16a8a2b17b4 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2597,6 +2597,8 @@ enum i915_power_well_id {
 #define   GFX_FORWARD_VBLANK_ALWAYS	(1<<5)
 #define   GFX_FORWARD_VBLANK_COND	(2<<5)
 
+#define   GEN11_GFX_DISABLE_LEGACY_MODE	(1<<3)
+
 #define VLV_DISPLAY_BASE 0x180000
 #define VLV_MIPI_BASE VLV_DISPLAY_BASE
 #define BXT_MIPI_BASE 0x60000
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index dab988f20833..d435a9982d0b 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1500,8 +1500,14 @@ static void enable_execlists(struct intel_engine_cs *engine)
 	struct drm_i915_private *dev_priv = engine->i915;
 
 	I915_WRITE(RING_HWSTAM(engine->mmio_base), 0xffffffff);
-	I915_WRITE(RING_MODE_GEN7(engine),
-		   _MASKED_BIT_ENABLE(GFX_RUN_LIST_ENABLE));
+
+	if (IS_GEN11(dev_priv))
+		I915_WRITE(RING_MODE_GEN7(engine),
+			   _MASKED_BIT_DISABLE(GEN11_GFX_DISABLE_LEGACY_MODE));
+	else
+		I915_WRITE(RING_MODE_GEN7(engine),
+			   _MASKED_BIT_ENABLE(GFX_RUN_LIST_ENABLE));
+
 	I915_WRITE(RING_HWS_PGA(engine->mmio_base),
 		   engine->status_page.ggtt_offset);
 	POSTING_READ(RING_HWS_PGA(engine->mmio_base));
-- 
2.14.3