drm/i915: Basic shared dpll support for WRPLLs

Just filing in names and ids, but not yet officially registering them
so that the hw state cross checker doesn't completely freak out about
them. Still since we do already read out and cross check
config->shared_dpll the basics are now there to flesh out the wrpll
shared dpll implementation.

The idea is now to roll out all the callbacks step-by-step and then at
the end switch to the shared dpll framework. This way hw and sw
changes are clearly separated.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
[imre: added const to hsw_ddi_pll_names (Damien)]
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_drv.h

@@ -184,8 +184,10 @@ struct i915_mmu_object;
 enum intel_dpll_id {
 	DPLL_ID_PRIVATE = -1, /* non-shared dpll in use */
 	/* real shared dpll ids must be >= 0 */
-	DPLL_ID_PCH_PLL_A,
-	DPLL_ID_PCH_PLL_B,
+	DPLL_ID_PCH_PLL_A = 0,
+	DPLL_ID_PCH_PLL_B = 1,
+	DPLL_ID_WRPLL1 = 0,
+	DPLL_ID_WRPLL2 = 1,
 };
 #define I915_NUM_PLLS 2
 

drivers/gpu/drm/i915/intel_ddi.c

@@ -784,9 +784,11 @@ bool intel_ddi_pll_select(struct intel_crtc *intel_crtc)
 		if (reg == WRPLL_CTL1) {
 			plls->wrpll1_refcount++;
 			intel_crtc->config.ddi_pll_sel = PORT_CLK_SEL_WRPLL1;
+			intel_crtc->config.shared_dpll = DPLL_ID_WRPLL1;
 		} else {
 			plls->wrpll2_refcount++;
 			intel_crtc->config.ddi_pll_sel = PORT_CLK_SEL_WRPLL2;
+			intel_crtc->config.shared_dpll = DPLL_ID_WRPLL2;
 		}
 	}
 
@@ -1315,10 +1317,25 @@ int intel_ddi_get_cdclk_freq(struct drm_i915_private *dev_priv)
 	}
 }
 
+static char *hsw_ddi_pll_names[] = {
+	"WRPLL 1",
+	"WRPLL 2",
+};
+
 void intel_ddi_pll_init(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	uint32_t val = I915_READ(LCPLL_CTL);
+	int i;
+
+	/* Dummy setup until everything is moved over to avoid upsetting the hw
+	 * state cross checker. */
+	dev_priv->num_shared_dpll = 0;
+
+	for (i = 0; i < 2; i++) {
+		dev_priv->shared_dplls[i].id = i;
+		dev_priv->shared_dplls[i].name = hsw_ddi_pll_names[i];
+	}
 
 	/* The LCPLL register should be turned on by the BIOS. For now let's
 	 * just check its state and print errors in case something is wrong.

drivers/gpu/drm/i915/intel_display.c

@@ -7583,6 +7583,16 @@ static void haswell_get_ddi_port_state(struct intel_crtc *crtc,
 	port = (tmp & TRANS_DDI_PORT_MASK) >> TRANS_DDI_PORT_SHIFT;
 
 	pipe_config->ddi_pll_sel = I915_READ(PORT_CLK_SEL(port));
+
+	switch (pipe_config->ddi_pll_sel) {
+	case PORT_CLK_SEL_WRPLL1:
+		pipe_config->shared_dpll = DPLL_ID_WRPLL1;
+		break;
+	case PORT_CLK_SEL_WRPLL2:
+		pipe_config->shared_dpll = DPLL_ID_WRPLL2;
+		break;
+	}
+
 	/*
 	 * Haswell has only FDI/PCH transcoder A. It is which is connected to
 	 * DDI E. So just check whether this pipe is wired to DDI E and whether
@@ -11286,12 +11296,6 @@ static const struct drm_crtc_funcs intel_crtc_funcs = {
 	.page_flip = intel_crtc_page_flip,
 };
 
-static void intel_cpu_pll_init(struct drm_device *dev)
-{
-	if (HAS_DDI(dev))
-		intel_ddi_pll_init(dev);
-}
-
 static bool ibx_pch_dpll_get_hw_state(struct drm_i915_private *dev_priv,
 				      struct intel_shared_dpll *pll,
 				      struct intel_dpll_hw_state *hw_state)
@@ -11379,7 +11383,9 @@ static void intel_shared_dpll_init(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
-	if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
+	if (HAS_DDI(dev))
+		intel_ddi_pll_init(dev);
+	else if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
 		ibx_pch_dpll_init(dev);
 	else
 		dev_priv->num_shared_dpll = 0;
@@ -12536,7 +12542,6 @@ void intel_modeset_init(struct drm_device *dev)
 	intel_init_dpio(dev);
 	intel_reset_dpio(dev);
 
-	intel_cpu_pll_init(dev);
 	intel_shared_dpll_init(dev);
 
 	/* Just disable it once at startup */