drm/i915/icl: implement the display init/uninit sequences

This code is similar enough to the CNL code that I considered just
adding ICL support to the CNL function, but I think it's still
different enough, and having a function specific to ICL allows us to
more easily adapt code in case the spec changes more later.

We're still missing the power wells and the mbus code, so leave those
pieces with a FIXME comment while they're not here yet.

v2: Don't use _PICK, don't WARN_ON(1), don't forget the chicken bits.
v3: Use _MMIO_PORT() (Ville).

Reviewed-by: James Ausmus <james.ausmus@intel.com> (v2)
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180205154046.11485-4-paulo.r.zanoni@intel.com

drivers/gpu/drm/i915/i915_reg.h

@@ -1906,6 +1906,11 @@ enum i915_power_well_id {
 #define   CL_POWER_DOWN_ENABLE		(1 << 4)
 #define   SUS_CLOCK_CONFIG		(3 << 0)
 
+#define _ICL_PORT_CL_DW5_A	0x162014
+#define _ICL_PORT_CL_DW5_B	0x6C014
+#define ICL_PORT_CL_DW5(port)	_MMIO_PORT(port, _ICL_PORT_CL_DW5_A, \
+						 _ICL_PORT_CL_DW5_B)
+
 #define _PORT_CL1CM_DW9_A		0x162024
 #define _PORT_CL1CM_DW9_BC		0x6C024
 #define   IREF0RC_OFFSET_SHIFT		8
@@ -7168,8 +7173,9 @@ enum {
 #define  RESET_PCH_HANDSHAKE_ENABLE	(1<<4)
 
 #define GEN8_CHICKEN_DCPR_1		_MMIO(0x46430)
-#define   SKL_SELECT_ALTERNATE_DC_EXIT	(1<<30)
-#define   MASK_WAKEMEM			(1<<13)
+#define   SKL_SELECT_ALTERNATE_DC_EXIT	(1 << 30)
+#define   MASK_WAKEMEM			(1 << 13)
+#define   CNL_DDI_CLOCK_REG_ACCESS_ON	(1 << 7)
 
 #define SKL_DFSM			_MMIO(0x51000)
 #define SKL_DFSM_CDCLK_LIMIT_MASK	(3 << 23)
@@ -9658,4 +9664,10 @@ enum skl_power_gate {
 #define  MMCD_PCLA		(1 << 31)
 #define  MMCD_HOTSPOT_EN	(1 << 27)
 
+#define _ICL_PHY_MISC_A		0x64C00
+#define _ICL_PHY_MISC_B		0x64C04
+#define ICL_PHY_MISC(port)	_MMIO_PORT(port, _ICL_PHY_MISC_A, \
+						 _ICL_PHY_MISC_B)
+#define  ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN	(1 << 23)
+
 #endif /* _I915_REG_H_ */

drivers/gpu/drm/i915/intel_runtime_pm.c

@@ -2919,6 +2919,80 @@ static void cnl_display_core_uninit(struct drm_i915_private *dev_priv)
 	I915_WRITE(CHICKEN_MISC_2, val);
 }
 
+static void icl_display_core_init(struct drm_i915_private *dev_priv,
+				  bool resume)
+{
+	enum port port;
+	u32 val;
+
+	gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
+
+	/* 1. Enable PCH reset handshake. */
+	val = I915_READ(HSW_NDE_RSTWRN_OPT);
+	val |= RESET_PCH_HANDSHAKE_ENABLE;
+	I915_WRITE(HSW_NDE_RSTWRN_OPT, val);
+
+	for (port = PORT_A; port <= PORT_B; port++) {
+		/* 2. Enable DDI combo PHY comp. */
+		val = I915_READ(ICL_PHY_MISC(port));
+		val &= ~ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN;
+		I915_WRITE(ICL_PHY_MISC(port), val);
+
+		cnl_set_procmon_ref_values(dev_priv, port);
+
+		val = I915_READ(ICL_PORT_COMP_DW0(port));
+		val |= COMP_INIT;
+		I915_WRITE(ICL_PORT_COMP_DW0(port), val);
+
+		/* 3. Set power down enable. */
+		val = I915_READ(ICL_PORT_CL_DW5(port));
+		val |= CL_POWER_DOWN_ENABLE;
+		I915_WRITE(ICL_PORT_CL_DW5(port), val);
+	}
+
+	/* 4. Enable power well 1 (PG1) and aux IO power. */
+	/* FIXME: ICL power wells code not here yet. */
+
+	/* 5. Enable CDCLK. */
+	icl_init_cdclk(dev_priv);
+
+	/* 6. Enable DBUF. */
+	gen9_dbuf_enable(dev_priv);
+
+	/* 7. Setup MBUS. */
+	/* FIXME: MBUS code not here yet. */
+
+	/* 8. CHICKEN_DCPR_1 */
+	I915_WRITE(GEN8_CHICKEN_DCPR_1, I915_READ(GEN8_CHICKEN_DCPR_1) |
+					CNL_DDI_CLOCK_REG_ACCESS_ON);
+}
+
+static void icl_display_core_uninit(struct drm_i915_private *dev_priv)
+{
+	enum port port;
+	u32 val;
+
+	gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
+
+	/* 1. Disable all display engine functions -> aready done */
+
+	/* 2. Disable DBUF */
+	gen9_dbuf_disable(dev_priv);
+
+	/* 3. Disable CD clock */
+	icl_uninit_cdclk(dev_priv);
+
+	/* 4. Disable Power Well 1 (PG1) and Aux IO Power */
+	/* FIXME: ICL power wells code not here yet. */
+
+	/* 5. Disable Comp */
+	for (port = PORT_A; port <= PORT_B; port++) {
+		val = I915_READ(ICL_PHY_MISC(port));
+		val |= ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN;
+		I915_WRITE(ICL_PHY_MISC(port), val);
+	}
+}
+
 static void chv_phy_control_init(struct drm_i915_private *dev_priv)
 {
 	struct i915_power_well *cmn_bc =
@@ -3051,7 +3125,9 @@ void intel_power_domains_init_hw(struct drm_i915_private *dev_priv, bool resume)
 
 	power_domains->initializing = true;
 
-	if (IS_CANNONLAKE(dev_priv)) {
+	if (IS_ICELAKE(dev_priv)) {
+		icl_display_core_init(dev_priv, resume);
+	} else if (IS_CANNONLAKE(dev_priv)) {
 		cnl_display_core_init(dev_priv, resume);
 	} else if (IS_GEN9_BC(dev_priv)) {
 		skl_display_core_init(dev_priv, resume);
@@ -3092,7 +3168,9 @@ void intel_power_domains_suspend(struct drm_i915_private *dev_priv)
 	if (!i915_modparams.disable_power_well)
 		intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
 
-	if (IS_CANNONLAKE(dev_priv))
+	if (IS_ICELAKE(dev_priv))
+		icl_display_core_uninit(dev_priv);
+	else if (IS_CANNONLAKE(dev_priv))
 		cnl_display_core_uninit(dev_priv);
 	else if (IS_GEN9_BC(dev_priv))
 		skl_display_core_uninit(dev_priv);