drm/i915/adl_s: Configure DPLL for ADL-S

Add changes for configuring DPLL for ADL-S
- Reusing DG1 DPLL 2 & DPLL 3 for ADL-S
- Extend CNL macro to choose DPLL_ENABLE
  for ADL-S.
- Select CFGCR0 and CFGCR1 for ADL-S plls.

On BSpec: 53720 PLL arrangement dig for adls:
DPLL2 cfgcr is programmed using _ADLS_DPLL3_CFGCR(0/1)
DPLL3 cfgcr is programmed using _ADLS_DPLL4_CFGCR(0/1)

v2 (Lucas): add missing update_ref_clks

Bspec: 50288
Bspec: 50289
Bspec: 49443

v3 : Adding another bit to HDPORT_DPLL_USED_MASK bitfield
for DPLL3_USED.(mdroper)

Bspec: 53707

v4:  BSpec 53723 has been updated with note - DPLL2 is
controlled by DPLL4 CFGCR 0/1.(mdroper)

Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Aditya Swarup <aditya.swarup@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210125140753.347998-6-aditya.swarup@intel.com

drivers/gpu/drm/i915/display/intel_dpll_mgr.c

@@ -3559,7 +3559,13 @@ static bool icl_get_combo_phy_dpll(struct intel_atomic_state *state,
 
 	icl_calc_dpll_state(dev_priv, &pll_params, &port_dpll->hw_state);
 
-	if (IS_DG1(dev_priv)) {
+	if (IS_ALDERLAKE_S(dev_priv)) {
+		dpll_mask =
+			BIT(DPLL_ID_DG1_DPLL3) |
+			BIT(DPLL_ID_DG1_DPLL2) |
+			BIT(DPLL_ID_ICL_DPLL1) |
+			BIT(DPLL_ID_ICL_DPLL0);
+	} else if (IS_DG1(dev_priv)) {
 		if (port == PORT_D || port == PORT_E) {
 			dpll_mask =
 				BIT(DPLL_ID_DG1_DPLL2) |
@@ -3865,7 +3871,10 @@ static bool icl_pll_get_hw_state(struct drm_i915_private *dev_priv,
 	if (!(val & PLL_ENABLE))
 		goto out;
 
-	if (IS_DG1(dev_priv)) {
+	if (IS_ALDERLAKE_S(dev_priv)) {
+		hw_state->cfgcr0 = intel_de_read(dev_priv, ADLS_DPLL_CFGCR0(id));
+		hw_state->cfgcr1 = intel_de_read(dev_priv, ADLS_DPLL_CFGCR1(id));
+	} else if (IS_DG1(dev_priv)) {
 		hw_state->cfgcr0 = intel_de_read(dev_priv, DG1_DPLL_CFGCR0(id));
 		hw_state->cfgcr1 = intel_de_read(dev_priv, DG1_DPLL_CFGCR1(id));
 	} else if (IS_ROCKETLAKE(dev_priv)) {
@@ -3921,7 +3930,10 @@ static void icl_dpll_write(struct drm_i915_private *dev_priv,
 	const enum intel_dpll_id id = pll->info->id;
 	i915_reg_t cfgcr0_reg, cfgcr1_reg;
 
-	if (IS_DG1(dev_priv)) {
+	if (IS_ALDERLAKE_S(dev_priv)) {
+		cfgcr0_reg = ADLS_DPLL_CFGCR0(id);
+		cfgcr1_reg = ADLS_DPLL_CFGCR1(id);
+	} else if (IS_DG1(dev_priv)) {
 		cfgcr0_reg = DG1_DPLL_CFGCR0(id);
 		cfgcr1_reg = DG1_DPLL_CFGCR1(id);
 	} else if (IS_ROCKETLAKE(dev_priv)) {
@@ -4384,6 +4396,22 @@ static const struct intel_dpll_mgr dg1_pll_mgr = {
 	.dump_hw_state = icl_dump_hw_state,
 };
 
+static const struct dpll_info adls_plls[] = {
+	{ "DPLL 0", &combo_pll_funcs, DPLL_ID_ICL_DPLL0, 0 },
+	{ "DPLL 1", &combo_pll_funcs, DPLL_ID_ICL_DPLL1, 0 },
+	{ "DPLL 2", &combo_pll_funcs, DPLL_ID_DG1_DPLL2, 0 },
+	{ "DPLL 3", &combo_pll_funcs, DPLL_ID_DG1_DPLL3, 0 },
+	{ },
+};
+
+static const struct intel_dpll_mgr adls_pll_mgr = {
+	.dpll_info = adls_plls,
+	.get_dplls = icl_get_dplls,
+	.put_dplls = icl_put_dplls,
+	.update_ref_clks = icl_update_dpll_ref_clks,
+	.dump_hw_state = icl_dump_hw_state,
+};
+
 /**
  * intel_shared_dpll_init - Initialize shared DPLLs
  * @dev: drm device
@@ -4397,7 +4425,9 @@ void intel_shared_dpll_init(struct drm_device *dev)
 	const struct dpll_info *dpll_info;
 	int i;
 
-	if (IS_DG1(dev_priv))
+	if (IS_ALDERLAKE_S(dev_priv))
+		dpll_mgr = &adls_pll_mgr;
+	else if (IS_DG1(dev_priv))
 		dpll_mgr = &dg1_pll_mgr;
 	else if (IS_ROCKETLAKE(dev_priv))
 		dpll_mgr = &rkl_pll_mgr;

drivers/gpu/drm/i915/i915_reg.h

@@ -2930,7 +2930,7 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
 #define MBUS_BBOX_CTL_S2		_MMIO(0x45044)
 
 #define HDPORT_STATE			_MMIO(0x45050)
-#define   HDPORT_DPLL_USED_MASK		REG_GENMASK(14, 12)
+#define   HDPORT_DPLL_USED_MASK		REG_GENMASK(15, 12)
 #define   HDPORT_DDI_USED(phy)		REG_BIT(2 * (phy) + 1)
 #define   HDPORT_ENABLED		REG_BIT(0)
 
@@ -10345,11 +10345,14 @@ enum skl_power_gate {
 /* CNL PLL */
 #define DPLL0_ENABLE		0x46010
 #define DPLL1_ENABLE		0x46014
+#define _ADLS_DPLL2_ENABLE	0x46018
+#define _ADLS_DPLL3_ENABLE	0x46030
 #define  PLL_ENABLE		(1 << 31)
 #define  PLL_LOCK		(1 << 30)
 #define  PLL_POWER_ENABLE	(1 << 27)
 #define  PLL_POWER_STATE	(1 << 26)
-#define CNL_DPLL_ENABLE(pll)	_MMIO_PLL(pll, DPLL0_ENABLE, DPLL1_ENABLE)
+#define CNL_DPLL_ENABLE(pll)	_MMIO_PLL3(pll, DPLL0_ENABLE, DPLL1_ENABLE, \
+					   _ADLS_DPLL2_ENABLE, _ADLS_DPLL3_ENABLE)
 
 #define TBT_PLL_ENABLE		_MMIO(0x46020)
 
@@ -10595,6 +10598,21 @@ enum skl_power_gate {
 						   _DG1_DPLL2_CFGCR1, \
 						   _DG1_DPLL3_CFGCR1)
 
+/* For ADL-S DPLL4_CFGCR0/1 are used to control DPLL2 */
+#define _ADLS_DPLL3_CFGCR0		0x1642C0
+#define _ADLS_DPLL4_CFGCR0		0x164294
+#define ADLS_DPLL_CFGCR0(pll)		_MMIO_PLL3(pll, _TGL_DPLL0_CFGCR0, \
+						   _TGL_DPLL1_CFGCR0, \
+						   _ADLS_DPLL4_CFGCR0, \
+						   _ADLS_DPLL3_CFGCR0)
+
+#define _ADLS_DPLL3_CFGCR1		0x1642C4
+#define _ADLS_DPLL4_CFGCR1		0x164298
+#define ADLS_DPLL_CFGCR1(pll)		_MMIO_PLL3(pll, _TGL_DPLL0_CFGCR1, \
+						   _TGL_DPLL1_CFGCR1, \
+						   _ADLS_DPLL4_CFGCR1, \
+						   _ADLS_DPLL3_CFGCR1)
+
 #define _DKL_PHY1_BASE			0x168000
 #define _DKL_PHY2_BASE			0x169000
 #define _DKL_PHY3_BASE			0x16A000