drm/i915: Manage HSW/BDW LCPLLs with the shared dpll interface

Manage the LCPLLs used with DisplayPort, so that all the HSW/BDW DPLLs
are managed by the shared dpll code.

v2: Introduce INTEL_DPLL_ALWAYS_ON flag to please state checker. (Ander)

v3: Initialize pll->flags in intel_shared_dpll_init(). (Ander)
Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1457451987-17466-13-git-send-email-ander.conselvan.de.oliveira@intel.com

drivers/gpu/drm/i915/intel_ddi.c

@@ -992,17 +992,13 @@ hsw_ddi_pll_select(struct intel_crtc *intel_crtc,
 {
 	struct intel_shared_dpll *pll;
 
-	if (intel_encoder->type == INTEL_OUTPUT_HDMI ||
-	    intel_encoder->type == INTEL_OUTPUT_ANALOG) {
-		pll = intel_get_shared_dpll(intel_crtc, crtc_state,
-					    intel_encoder);
-		if (!pll)
-			DRM_DEBUG_DRIVER("failed to find PLL for pipe %c\n",
-					 pipe_name(intel_crtc->pipe));
-		return pll;
-	} else {
-		return true;
-	}
+	pll = intel_get_shared_dpll(intel_crtc, crtc_state,
+				    intel_encoder);
+	if (!pll)
+		DRM_DEBUG_DRIVER("failed to find PLL for pipe %c\n",
+				 pipe_name(intel_crtc->pipe));
+
+	return pll;
 }
 
 static bool

drivers/gpu/drm/i915/intel_display.c

@@ -9821,13 +9821,19 @@ static void haswell_get_ddi_pll(struct drm_i915_private *dev_priv,
 	case PORT_CLK_SEL_SPLL:
 		id = DPLL_ID_SPLL;
 		break;
+	case PORT_CLK_SEL_LCPLL_810:
+		id = DPLL_ID_LCPLL_810;
+		break;
+	case PORT_CLK_SEL_LCPLL_1350:
+		id = DPLL_ID_LCPLL_1350;
+		break;
+	case PORT_CLK_SEL_LCPLL_2700:
+		id = DPLL_ID_LCPLL_2700;
+		break;
 	default:
 		MISSING_CASE(pipe_config->ddi_pll_sel);
 		/* fall through */
 	case PORT_CLK_SEL_NONE:
-	case PORT_CLK_SEL_LCPLL_810:
-	case PORT_CLK_SEL_LCPLL_1350:
-	case PORT_CLK_SEL_LCPLL_2700:
 		return;
 	}
 
@@ -12942,11 +12948,14 @@ check_shared_dpll_state(struct drm_device *dev)
 		     pll->active, hweight32(pll->config.crtc_mask));
 		I915_STATE_WARN(pll->active && !pll->on,
 		     "pll in active use but not on in sw tracking\n");
-		I915_STATE_WARN(pll->on && !pll->active,
-		     "pll in on but not on in use in sw tracking\n");
-		I915_STATE_WARN(pll->on != active,
-		     "pll on state mismatch (expected %i, found %i)\n",
-		     pll->on, active);
+
+		if (!(pll->flags & INTEL_DPLL_ALWAYS_ON)) {
+			I915_STATE_WARN(pll->on && !pll->active,
+			     "pll in on but not on in use in sw tracking\n");
+			I915_STATE_WARN(pll->on != active,
+			     "pll on state mismatch (expected %i, found %i)\n",
+			     pll->on, active);
+		}
 
 		for_each_intel_crtc(dev, crtc) {
 			if (crtc->base.state->enable && crtc->config->shared_dpll == pll)

drivers/gpu/drm/i915/intel_dp.c

@@ -1283,25 +1283,6 @@ skl_edp_set_pll_config(struct intel_crtc_state *pipe_config)
 	pipe_config->dpll_hw_state.ctrl1 = ctrl1;
 }
 
-void
-hsw_dp_set_ddi_pll_sel(struct intel_crtc_state *pipe_config)
-{
-	memset(&pipe_config->dpll_hw_state, 0,
-	       sizeof(pipe_config->dpll_hw_state));
-
-	switch (pipe_config->port_clock / 2) {
-	case 81000:
-		pipe_config->ddi_pll_sel = PORT_CLK_SEL_LCPLL_810;
-		break;
-	case 135000:
-		pipe_config->ddi_pll_sel = PORT_CLK_SEL_LCPLL_1350;
-		break;
-	case 270000:
-		pipe_config->ddi_pll_sel = PORT_CLK_SEL_LCPLL_2700;
-		break;
-	}
-}
-
 static int
 intel_dp_sink_rates(struct intel_dp *intel_dp, const int **sink_rates)
 {
@@ -1661,10 +1642,8 @@ intel_dp_compute_config(struct intel_encoder *encoder,
 
 	if ((IS_SKYLAKE(dev)  || IS_KABYLAKE(dev)) && is_edp(intel_dp))
 		skl_edp_set_pll_config(pipe_config);
-	else if (IS_BROXTON(dev))
+	else if (IS_BROXTON(dev) || IS_HASWELL(dev) || IS_BROADWELL(dev))
 		/* handled in ddi */;
-	else if (IS_HASWELL(dev) || IS_BROADWELL(dev))
-		hsw_dp_set_ddi_pll_sel(pipe_config);
 	else
 		intel_dp_set_clock(encoder, pipe_config);
 

drivers/gpu/drm/i915/intel_dp_mst.c

@@ -33,7 +33,6 @@
 static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
 					struct intel_crtc_state *pipe_config)
 {
-	struct drm_device *dev = encoder->base.dev;
 	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 	struct intel_digital_port *intel_dig_port = intel_mst->primary;
 	struct intel_dp *intel_dp = &intel_dig_port->dp;
@@ -92,9 +91,6 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
 
 	pipe_config->dp_m_n.tu = slots;
 
-	if (IS_HASWELL(dev) || IS_BROADWELL(dev))
-		hsw_dp_set_ddi_pll_sel(pipe_config);
-
 	return true;
 
 }

drivers/gpu/drm/i915/intel_dpll_mgr.c

@@ -447,6 +447,12 @@ static uint32_t hsw_pll_to_ddi_pll_sel(struct intel_shared_dpll *pll)
 		return PORT_CLK_SEL_WRPLL2;
 	case DPLL_ID_SPLL:
 		return PORT_CLK_SEL_SPLL;
+	case DPLL_ID_LCPLL_810:
+		return PORT_CLK_SEL_LCPLL_810;
+	case DPLL_ID_LCPLL_1350:
+		return PORT_CLK_SEL_LCPLL_1350;
+	case DPLL_ID_LCPLL_2700:
+		return PORT_CLK_SEL_LCPLL_2700;
 	default:
 		return PORT_CLK_SEL_NONE;
 	}
@@ -671,9 +677,13 @@ static struct intel_shared_dpll *
 hsw_get_dpll(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state,
 	     struct intel_encoder *encoder)
 {
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
 	struct intel_shared_dpll *pll;
 	int clock = crtc_state->port_clock;
 
+	memset(&crtc_state->dpll_hw_state, 0,
+	       sizeof(crtc_state->dpll_hw_state));
+
 	if (encoder->type == INTEL_OUTPUT_HDMI) {
 		uint32_t val;
 		unsigned p, n2, r2;
@@ -684,21 +694,37 @@ hsw_get_dpll(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state,
 		      WRPLL_DIVIDER_REFERENCE(r2) | WRPLL_DIVIDER_FEEDBACK(n2) |
 		      WRPLL_DIVIDER_POST(p);
 
-		memset(&crtc_state->dpll_hw_state, 0,
-		       sizeof(crtc_state->dpll_hw_state));
-
 		crtc_state->dpll_hw_state.wrpll = val;
 
 		pll = intel_find_shared_dpll(crtc, crtc_state,
 					     DPLL_ID_WRPLL1, DPLL_ID_WRPLL2);
 
+	} else if (encoder->type == INTEL_OUTPUT_DISPLAYPORT ||
+		   encoder->type == INTEL_OUTPUT_DP_MST ||
+		   encoder->type == INTEL_OUTPUT_EDP) {
+		enum intel_dpll_id pll_id;
+
+		switch (clock / 2) {
+		case 81000:
+			pll_id = DPLL_ID_LCPLL_810;
+			break;
+		case 135000:
+			pll_id = DPLL_ID_LCPLL_1350;
+			break;
+		case 270000:
+			pll_id = DPLL_ID_LCPLL_2700;
+			break;
+		default:
+			DRM_DEBUG_KMS("Invalid clock for DP: %d\n", clock);
+			return NULL;
+		}
+
+		pll = intel_get_shared_dpll_by_id(dev_priv, pll_id);
+
 	} else if (encoder->type == INTEL_OUTPUT_ANALOG) {
 		if (WARN_ON(crtc_state->port_clock / 2 != 135000))
 			return NULL;
 
-		memset(&crtc_state->dpll_hw_state, 0,
-		       sizeof(crtc_state->dpll_hw_state));
-
 		crtc_state->dpll_hw_state.spll =
 			SPLL_PLL_ENABLE | SPLL_PLL_FREQ_1350MHz | SPLL_PLL_SSC;
 
@@ -731,6 +757,29 @@ static const struct intel_shared_dpll_funcs hsw_ddi_spll_funcs = {
 	.get_hw_state = hsw_ddi_spll_get_hw_state,
 };
 
+static void hsw_ddi_lcpll_enable(struct drm_i915_private *dev_priv,
+				 struct intel_shared_dpll *pll)
+{
+}
+
+static void hsw_ddi_lcpll_disable(struct drm_i915_private *dev_priv,
+				  struct intel_shared_dpll *pll)
+{
+}
+
+static bool hsw_ddi_lcpll_get_hw_state(struct drm_i915_private *dev_priv,
+				       struct intel_shared_dpll *pll,
+				       struct intel_dpll_hw_state *hw_state)
+{
+	return true;
+}
+
+static const struct intel_shared_dpll_funcs hsw_ddi_lcpll_funcs = {
+	.enable = hsw_ddi_lcpll_enable,
+	.disable = hsw_ddi_lcpll_disable,
+	.get_hw_state = hsw_ddi_lcpll_get_hw_state,
+};
+
 struct skl_dpll_regs {
 	i915_reg_t ctl, cfgcr1, cfgcr2;
 };
@@ -1537,6 +1586,7 @@ struct dpll_info {
 	const char *name;
 	const int id;
 	const struct intel_shared_dpll_funcs *funcs;
+	uint32_t flags;
 };
 
 struct intel_dpll_mgr {
@@ -1548,9 +1598,9 @@ struct intel_dpll_mgr {
 };
 
 static const struct dpll_info pch_plls[] = {
-	{ "PCH DPLL A", DPLL_ID_PCH_PLL_A, &ibx_pch_dpll_funcs },
-	{ "PCH DPLL B", DPLL_ID_PCH_PLL_B, &ibx_pch_dpll_funcs },
-	{ NULL, -1, NULL },
+	{ "PCH DPLL A", DPLL_ID_PCH_PLL_A, &ibx_pch_dpll_funcs, 0 },
+	{ "PCH DPLL B", DPLL_ID_PCH_PLL_B, &ibx_pch_dpll_funcs, 0 },
+	{ NULL, -1, NULL, 0 },
 };
 
 static const struct intel_dpll_mgr pch_pll_mgr = {
@@ -1559,9 +1609,12 @@ static const struct intel_dpll_mgr pch_pll_mgr = {
 };
 
 static const struct dpll_info hsw_plls[] = {
-	{ "WRPLL 1", DPLL_ID_WRPLL1, &hsw_ddi_wrpll_funcs },
-	{ "WRPLL 2", DPLL_ID_WRPLL2, &hsw_ddi_wrpll_funcs },
-	{ "SPLL",    DPLL_ID_SPLL,   &hsw_ddi_spll_funcs },
+	{ "WRPLL 1",    DPLL_ID_WRPLL1,     &hsw_ddi_wrpll_funcs, 0 },
+	{ "WRPLL 2",    DPLL_ID_WRPLL2,     &hsw_ddi_wrpll_funcs, 0 },
+	{ "SPLL",       DPLL_ID_SPLL,       &hsw_ddi_spll_funcs,  0 },
+	{ "LCPLL 810",  DPLL_ID_LCPLL_810,  &hsw_ddi_lcpll_funcs, INTEL_DPLL_ALWAYS_ON },
+	{ "LCPLL 1350", DPLL_ID_LCPLL_1350, &hsw_ddi_lcpll_funcs, INTEL_DPLL_ALWAYS_ON },
+	{ "LCPLL 2700", DPLL_ID_LCPLL_2700, &hsw_ddi_lcpll_funcs, INTEL_DPLL_ALWAYS_ON },
 	{ NULL, -1, NULL, },
 };
 
@@ -1571,9 +1624,9 @@ static const struct intel_dpll_mgr hsw_pll_mgr = {
 };
 
 static const struct dpll_info skl_plls[] = {
-	{ "DPPL 1", DPLL_ID_SKL_DPLL1, &skl_ddi_pll_funcs },
-	{ "DPPL 2", DPLL_ID_SKL_DPLL2, &skl_ddi_pll_funcs },
-	{ "DPPL 3", DPLL_ID_SKL_DPLL3, &skl_ddi_pll_funcs },
+	{ "DPPL 1", DPLL_ID_SKL_DPLL1, &skl_ddi_pll_funcs, 0 },
+	{ "DPPL 2", DPLL_ID_SKL_DPLL2, &skl_ddi_pll_funcs, 0 },
+	{ "DPPL 3", DPLL_ID_SKL_DPLL3, &skl_ddi_pll_funcs, 0 },
 	{ NULL, -1, NULL, },
 };
 
@@ -1583,9 +1636,9 @@ static const struct intel_dpll_mgr skl_pll_mgr = {
 };
 
 static const struct dpll_info bxt_plls[] = {
-	{ "PORT PLL A", 0, &bxt_ddi_pll_funcs },
-	{ "PORT PLL B", 1, &bxt_ddi_pll_funcs },
-	{ "PORT PLL C", 2, &bxt_ddi_pll_funcs },
+	{ "PORT PLL A", 0, &bxt_ddi_pll_funcs, 0 },
+	{ "PORT PLL B", 1, &bxt_ddi_pll_funcs, 0 },
+	{ "PORT PLL C", 2, &bxt_ddi_pll_funcs, 0 },
 	{ NULL, -1, NULL, },
 };
 
@@ -1623,6 +1676,7 @@ void intel_shared_dpll_init(struct drm_device *dev)
 		dev_priv->shared_dplls[i].id = dpll_info[i].id;
 		dev_priv->shared_dplls[i].name = dpll_info[i].name;
 		dev_priv->shared_dplls[i].funcs = *dpll_info[i].funcs;
+		dev_priv->shared_dplls[i].flags = dpll_info[i].flags;
 	}
 
 	dev_priv->dpll_mgr = dpll_mgr;

drivers/gpu/drm/i915/intel_dpll_mgr.h

@@ -49,13 +49,21 @@ enum intel_dpll_id {
 	DPLL_ID_WRPLL1 = 0,
 	DPLL_ID_WRPLL2 = 1,
 	DPLL_ID_SPLL = 2,
+	DPLL_ID_LCPLL_810 = 3,
+	DPLL_ID_LCPLL_1350 = 4,
+	DPLL_ID_LCPLL_2700 = 5,
 
 	/* skl */
 	DPLL_ID_SKL_DPLL1 = 0,
 	DPLL_ID_SKL_DPLL2 = 1,
 	DPLL_ID_SKL_DPLL3 = 2,
 };
-#define I915_NUM_PLLS 3
+#define I915_NUM_PLLS 6
+
+/** Inform the state checker that the DPLL is kept enabled even if not
+ * in use by any crtc.
+ */
+#define INTEL_DPLL_ALWAYS_ON	(1 << 0)
 
 struct intel_dpll_hw_state {
 	/* i9xx, pch plls */
@@ -113,6 +121,8 @@ struct intel_shared_dpll {
 	enum intel_dpll_id id;
 
 	struct intel_shared_dpll_funcs funcs;
+
+	uint32_t flags;
 };
 
 #define SKL_DPLL0 0

drivers/gpu/drm/i915/intel_drv.h

@@ -1312,7 +1312,6 @@ void intel_edp_drrs_invalidate(struct drm_device *dev,
 void intel_edp_drrs_flush(struct drm_device *dev, unsigned frontbuffer_bits);
 bool intel_digital_port_connected(struct drm_i915_private *dev_priv,
 					 struct intel_digital_port *port);
-void hsw_dp_set_ddi_pll_sel(struct intel_crtc_state *pipe_config);
 
 void
 intel_dp_program_link_training_pattern(struct intel_dp *intel_dp,