[PATCH v2 14/25] drm/i915/xe2hpd: Add missing chicken bit register programming

[Balasubramani Vivekanandan]

From: Anusha Srivatsa <anusha.srivatsa at intel.com>

Add step 9 from initialize display sequence.

Bpsec: 49189
Signed-off-by: Anusha Srivatsa <anusha.srivatsa at intel.com>
Signed-off-by: Balasubramani Vivekanandan <balasubramani.vivekanandan at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_power.c | 4 ++++
 drivers/gpu/drm/i915/i915_reg.h                    | 1 +
 2 files changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
index 6fd4fa52253a..bf9685acf75a 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power.c
@@ -1694,6 +1694,10 @@ static void icl_display_core_init(struct drm_i915_private *dev_priv,
 	if (IS_DG2(dev_priv))
 		intel_snps_phy_wait_for_calibration(dev_priv);
 
+	/* 9. XE2_HPD: Program CHICKEN_MISC_2 before any cursor or planes are enabled */
+	if (DISPLAY_VER_FULL(dev_priv) == IP_VER(14, 1))
+		intel_de_rmw(dev_priv, CHICKEN_MISC_2, BMG_DARB_HALF_BLK_END_BURST, 1);
+
 	if (resume)
 		intel_dmc_load_program(dev_priv);
 
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 58f3e4bfe254..875d76fb8cd0 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4548,6 +4548,7 @@
 
 #define CHICKEN_MISC_2		_MMIO(0x42084)
 #define   CHICKEN_MISC_DISABLE_DPT	REG_BIT(30) /* adl,dg2 */
+#define   BMG_DARB_HALF_BLK_END_BURST	REG_BIT(27)
 #define   KBL_ARB_FILL_SPARE_14		REG_BIT(14)
 #define   KBL_ARB_FILL_SPARE_13		REG_BIT(13)
 #define   GLK_CL2_PWR_DOWN		REG_BIT(12)
-- 
2.25.1