[Intel-gfx] [PATCH v6 5/5] drm/i915/rkl: Add Wa_14011224835 for PHY B initialization

[Matt Roper]

After doing normal PHY-B initialization on Rocket Lake, we need to
manually copy some additional PHY-A register values into PHY-B
registers.

Note that the bspec's combo phy page doesn't specify that this
workaround is restricted to specific platform steppings (and doesn't
even do a very good job of specifying that RKL is the only platform this
is needed on), but the RKL workaround page lists this as relevant only
for A and B steppings, so I'm trusting that information for now.

Bspec: 49291
Bspec: 53273
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
 .../gpu/drm/i915/display/intel_combo_phy.c    | 26 +++++++++++++++++++
 drivers/gpu/drm/i915/i915_reg.h               | 13 +++++++++-
 2 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_combo_phy.c b/drivers/gpu/drm/i915/display/intel_combo_phy.c
index 77b04bb3ec62..53a1b49e305a 100644
--- a/drivers/gpu/drm/i915/display/intel_combo_phy.c
+++ b/drivers/gpu/drm/i915/display/intel_combo_phy.c
@@ -338,6 +338,27 @@ void intel_combo_phy_power_up_lanes(struct drm_i915_private *dev_priv,
 	intel_de_write(dev_priv, ICL_PORT_CL_DW10(phy), val);
 }
 
+void rkl_combo_phy_b_init_wa(struct drm_i915_private *i915)
+{
+	u32 grccode, grccode_ldo;
+	u32 iref_rcal_ord, rcompcode_ld_cap_ov;
+
+	intel_de_wait_for_register(i915, ICL_PORT_COMP_DW3(PHY_A),
+				   FIRST_COMP_DONE, FIRST_COMP_DONE, 100);
+
+	grccode = REG_FIELD_GET(GRCCODE,
+				intel_de_read(i915, ICL_PORT_COMP_DW6(PHY_A)));
+	iref_rcal_ord = REG_FIELD_PREP(IREF_RCAL_ORD, grccode);
+	intel_de_rmw(i915, ICL_PORT_COMP_DW2(PHY_B), IREF_RCAL_ORD,
+		     iref_rcal_ord | IREF_RCAL_ORD_EN);
+
+	grccode_ldo = REG_FIELD_GET(GRCCODE_LDO,
+				    intel_de_read(i915, ICL_PORT_COMP_DW0(PHY_A)));
+	rcompcode_ld_cap_ov = REG_FIELD_PREP(RCOMPCODE_LD_CAP_OV, grccode_ldo);
+	intel_de_rmw(i915, ICL_PORT_COMP_DW6(PHY_B), RCOMPCODE_LD_CAP_OV,
+		     rcompcode_ld_cap_ov | RCOMPCODEOVEN_LDO_SYNC);
+}
+
 static void icl_combo_phys_init(struct drm_i915_private *dev_priv)
 {
 	enum phy phy;
@@ -390,6 +411,11 @@ static void icl_combo_phys_init(struct drm_i915_private *dev_priv)
 		val = intel_de_read(dev_priv, ICL_PORT_CL_DW5(phy));
 		val |= CL_POWER_DOWN_ENABLE;
 		intel_de_write(dev_priv, ICL_PORT_CL_DW5(phy), val);
+
+		if (IS_RKL_REVID(dev_priv, RKL_REVID_A0, RKL_REVID_B0) &&
+		    phy == PHY_B)
+			/* Wa_14011224835:rkl[a0..c0] */
+			rkl_combo_phy_b_init_wa(dev_priv);
 	}
 }
 
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 90f11517f656..9c0d0ca14664 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1909,11 +1909,16 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
 
 #define CNL_PORT_COMP_DW0		_MMIO(0x162100)
 #define ICL_PORT_COMP_DW0(phy)		_MMIO(_ICL_PORT_COMP_DW(0, phy))
-#define   COMP_INIT			(1 << 31)
+#define   COMP_INIT			REG_BIT(31)
+#define   GRCCODE_LDO			REG_GENMASK(7, 0)
 
 #define CNL_PORT_COMP_DW1		_MMIO(0x162104)
 #define ICL_PORT_COMP_DW1(phy)		_MMIO(_ICL_PORT_COMP_DW(1, phy))
 
+#define ICL_PORT_COMP_DW2(phy)		_MMIO(_ICL_PORT_COMP_DW(2, phy))
+#define   IREF_RCAL_ORD_EN		REG_BIT(7)
+#define   IREF_RCAL_ORD			REG_GENMASK(6, 0)
+
 #define CNL_PORT_COMP_DW3		_MMIO(0x16210c)
 #define ICL_PORT_COMP_DW3(phy)		_MMIO(_ICL_PORT_COMP_DW(3, phy))
 #define   PROCESS_INFO_DOT_0		(0 << 26)
@@ -1926,6 +1931,12 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
 #define   VOLTAGE_INFO_1_05V		(2 << 24)
 #define   VOLTAGE_INFO_MASK		(3 << 24)
 #define   VOLTAGE_INFO_SHIFT		24
+#define   FIRST_COMP_DONE		REG_BIT(22)
+
+#define ICL_PORT_COMP_DW6(phy)		_MMIO(_ICL_PORT_COMP_DW(6, phy))
+#define   GRCCODE			REG_GENMASK(30, 24)
+#define   RCOMPCODEOVEN_LDO_SYNC	REG_BIT(23)
+#define   RCOMPCODE_LD_CAP_OV		REG_GENMASK(22, 16)
 
 #define ICL_PORT_COMP_DW8(phy)		_MMIO(_ICL_PORT_COMP_DW(8, phy))
 #define   IREFGEN			(1 << 24)
-- 
2.24.1