drm/i915/rkl: Add DPLL4 support

Rocket Lake has a third DPLL (called 'DPLL4') that must be used to
enable a third display. Unlike EHL's variant of DPLL4, the RKL variant
behaves the same as DPLL0/1. And despite its name, the DPLL4 registers
are offset as if it were DPLL2.

v2:
- Add new .update_ref_clks() hook.

v3:
- Renumber TBT PLL to '3' and switch _MMIO_PLL3 to _MMIO_PLL (Lucas)

v4:
- Don't drop _MMIO_PLL3; although it's now unused, we're going to need
it very soon again for upcoming DG1 patches. (Lucas)

v5:
- Don't re-number TBT PLL and beyond, just use new RKL_DPLL_CFGCR
macros to lookup the proper registers instead. Although renumbering
the PLLs might be something we want to consider down the road, it
opens a big can of worms right now since a bunch of places in the
code have an assumption that the PLL table has idx==id and no holes.
Renumbering creates a hole for TGL, so we'd either need to allow
holes in the table or break the idx==id invariant, both of which are
somewhat invasive changes to the design.

Bspec: 49202
Bspec: 49443
Bspec: 50288
Bspec: 50289
Cc: Lucas De Marchi <[e-mail]>
Cc: José Roberto de Souza <[e-mail]>
Signed-off-by: Matt Roper <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]
Reviewed-by: Lucas De Marchi <[e-mail]>
Signed-off-by: Rodrigo Vivi <[e-mail]>

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

···
 
 	icl_calc_dpll_state(dev_priv, &pll_params, &port_dpll->hw_state);
 
-	if (IS_ELKHARTLAKE(dev_priv) && port != PORT_A)
+	if (IS_ROCKETLAKE(dev_priv)) {
 		dpll_mask =
 			BIT(DPLL_ID_EHL_DPLL4) |
 			BIT(DPLL_ID_ICL_DPLL1) |
 			BIT(DPLL_ID_ICL_DPLL0);
-	else
+	} else if (IS_ELKHARTLAKE(dev_priv) && port != PORT_A) {
+		dpll_mask =
+			BIT(DPLL_ID_EHL_DPLL4) |
+			BIT(DPLL_ID_ICL_DPLL1) |
+			BIT(DPLL_ID_ICL_DPLL0);
+	} else {
 		dpll_mask = BIT(DPLL_ID_ICL_DPLL1) | BIT(DPLL_ID_ICL_DPLL0);
+	}
 
 	port_dpll->pll = intel_find_shared_dpll(state, crtc,
 						&port_dpll->hw_state,
···
 	if (!(val & PLL_ENABLE))
 		goto out;
 
-	if (INTEL_GEN(dev_priv) >= 12) {
+	if (IS_ROCKETLAKE(dev_priv)) {
+		hw_state->cfgcr0 = intel_de_read(dev_priv,
+						 RKL_DPLL_CFGCR0(id));
+		hw_state->cfgcr1 = intel_de_read(dev_priv,
+						 RKL_DPLL_CFGCR1(id));
+	} else if (INTEL_GEN(dev_priv) >= 12) {
 		hw_state->cfgcr0 = intel_de_read(dev_priv,
 						 TGL_DPLL_CFGCR0(id));
 		hw_state->cfgcr1 = intel_de_read(dev_priv,
···
 	const enum intel_dpll_id id = pll->info->id;
 	i915_reg_t cfgcr0_reg, cfgcr1_reg;
 
-	if (INTEL_GEN(dev_priv) >= 12) {
+	if (IS_ROCKETLAKE(dev_priv)) {
+		cfgcr0_reg = RKL_DPLL_CFGCR0(id);
+		cfgcr1_reg = RKL_DPLL_CFGCR1(id);
+	} else if (INTEL_GEN(dev_priv) >= 12) {
 		cfgcr0_reg = TGL_DPLL_CFGCR0(id);
 		cfgcr1_reg = TGL_DPLL_CFGCR1(id);
 	} else {
···
 	.dump_hw_state = icl_dump_hw_state,
 };
 
+static const struct dpll_info rkl_plls[] = {
+	{ "DPLL 0", &combo_pll_funcs, DPLL_ID_ICL_DPLL0, 0 },
+	{ "DPLL 1", &combo_pll_funcs, DPLL_ID_ICL_DPLL1, 0 },
+	{ "DPLL 4", &combo_pll_funcs, DPLL_ID_EHL_DPLL4, 0 },
+	{ },
+};
+
+static const struct intel_dpll_mgr rkl_pll_mgr = {
+	.dpll_info = rkl_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
···
 	const struct dpll_info *dpll_info;
 	int i;
 
-	if (INTEL_GEN(dev_priv) >= 12)
+	if (IS_ROCKETLAKE(dev_priv))
+		dpll_mgr = &rkl_pll_mgr;
+	else if (INTEL_GEN(dev_priv) >= 12)
 		dpll_mgr = &tgl_pll_mgr;
 	else if (IS_ELKHARTLAKE(dev_priv))
 		dpll_mgr = &ehl_pll_mgr;

drivers/gpu/drm/i915/i915_reg.h

···
 
 #define _TGL_DPLL0_CFGCR0		0x164284
 #define _TGL_DPLL1_CFGCR0		0x16428C
-/* TODO: add DPLL4 */
 #define _TGL_TBTPLL_CFGCR0		0x16429C
 #define TGL_DPLL_CFGCR0(pll)		_MMIO_PLL3(pll, _TGL_DPLL0_CFGCR0, \
 						  _TGL_DPLL1_CFGCR0, \
 						  _TGL_TBTPLL_CFGCR0)
+#define RKL_DPLL_CFGCR0(pll)		_MMIO_PLL(pll, _TGL_DPLL0_CFGCR0, \
+						  _TGL_DPLL1_CFGCR0)
 
 #define _TGL_DPLL0_CFGCR1		0x164288
 #define _TGL_DPLL1_CFGCR1		0x164290
-/* TODO: add DPLL4 */
 #define _TGL_TBTPLL_CFGCR1		0x1642A0
 #define TGL_DPLL_CFGCR1(pll)		_MMIO_PLL3(pll, _TGL_DPLL0_CFGCR1, \
 						   _TGL_DPLL1_CFGCR1, \
 						   _TGL_TBTPLL_CFGCR1)
+#define RKL_DPLL_CFGCR1(pll)		_MMIO_PLL(pll, _TGL_DPLL0_CFGCR1, \
+						  _TGL_DPLL1_CFGCR1)
 
 #define _DKL_PHY1_BASE			0x168000
 #define _DKL_PHY2_BASE			0x169000