drm/i915: Sanitize the shared DPLL find/reference interface

Pass the PLL HW state to the PLL find/reference functions making it
clearer what is their input. Also pass to these the atomic state and the
CRTC object instead of the CRTC state, since they don't require the
latter.

Move setting the PLL in the crtc_state to the get_dpll() hook, which
is the more logical place for this, where the related PLL HW state was also
set.

This refactoring is also a preparation for a follow-up patch that will
have to find/reference multiple PLLs.

No functional changes.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190628143635.22066-18-imre.deak@intel.com

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

@@ -244,17 +244,18 @@ void intel_disable_shared_dpll(const struct intel_crtc_state *crtc_state)
 }
 
 static struct intel_shared_dpll *
-intel_find_shared_dpll(struct intel_crtc_state *crtc_state,
+intel_find_shared_dpll(struct intel_atomic_state *state,
+		       const struct intel_crtc *crtc,
+		       const struct intel_dpll_hw_state *pll_state,
 		       enum intel_dpll_id range_min,
 		       enum intel_dpll_id range_max)
 {
-	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
 	struct intel_shared_dpll *pll, *unused_pll = NULL;
 	struct intel_shared_dpll_state *shared_dpll;
 	enum intel_dpll_id i;
 
-	shared_dpll = intel_atomic_get_shared_dpll_state(crtc_state->base.state);
+	shared_dpll = intel_atomic_get_shared_dpll_state(&state->base);
 
 	for (i = range_min; i <= range_max; i++) {
 		pll = &dev_priv->shared_dplls[i];
@@ -266,9 +267,9 @@ intel_find_shared_dpll(struct intel_crtc_state *crtc_state,
 			continue;
 		}
 
-		if (memcmp(&crtc_state->dpll_hw_state,
+		if (memcmp(pll_state,
 			   &shared_dpll[i].hw_state,
-			   sizeof(crtc_state->dpll_hw_state)) == 0) {
+			   sizeof(*pll_state)) == 0) {
 			DRM_DEBUG_KMS("[CRTC:%d:%s] sharing existing %s (crtc mask 0x%08x, active %x)\n",
 				      crtc->base.base.id, crtc->base.name,
 				      pll->info->name,
@@ -290,20 +291,19 @@ intel_find_shared_dpll(struct intel_crtc_state *crtc_state,
 }
 
 static void
-intel_reference_shared_dpll(struct intel_shared_dpll *pll,
-			    struct intel_crtc_state *crtc_state)
+intel_reference_shared_dpll(struct intel_atomic_state *state,
+			    const struct intel_crtc *crtc,
+			    const struct intel_shared_dpll *pll,
+			    const struct intel_dpll_hw_state *pll_state)
 {
 	struct intel_shared_dpll_state *shared_dpll;
-	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
 	const enum intel_dpll_id id = pll->info->id;
 
-	shared_dpll = intel_atomic_get_shared_dpll_state(crtc_state->base.state);
+	shared_dpll = intel_atomic_get_shared_dpll_state(&state->base);
 
 	if (shared_dpll[id].crtc_mask == 0)
-		shared_dpll[id].hw_state =
-			crtc_state->dpll_hw_state;
+		shared_dpll[id].hw_state = *pll_state;
 
-	crtc_state->shared_dpll = pll;
 	DRM_DEBUG_DRIVER("using %s for pipe %c\n", pll->info->name,
 			 pipe_name(crtc->pipe));
 
@@ -463,7 +463,8 @@ static bool ibx_get_dpll(struct intel_atomic_state *state,
 			      crtc->base.base.id, crtc->base.name,
 			      pll->info->name);
 	} else {
-		pll = intel_find_shared_dpll(crtc_state,
+		pll = intel_find_shared_dpll(state, crtc,
+					     &crtc_state->dpll_hw_state,
 					     DPLL_ID_PCH_PLL_A,
 					     DPLL_ID_PCH_PLL_B);
 	}
@@ -472,7 +473,10 @@ static bool ibx_get_dpll(struct intel_atomic_state *state,
 		return false;
 
 	/* reference the pll */
-	intel_reference_shared_dpll(pll, crtc_state);
+	intel_reference_shared_dpll(state, crtc,
+				    pll, &crtc_state->dpll_hw_state);
+
+	crtc_state->shared_dpll = pll;
 
 	return true;
 }
@@ -791,8 +795,12 @@ hsw_ddi_calculate_wrpll(int clock /* in Hz */,
 	*r2_out = best.r2;
 }
 
-static struct intel_shared_dpll *hsw_ddi_hdmi_get_dpll(struct intel_crtc_state *crtc_state)
+static struct intel_shared_dpll *
+hsw_ddi_hdmi_get_dpll(struct intel_atomic_state *state,
+		      struct intel_crtc *crtc)
 {
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
 	struct intel_shared_dpll *pll;
 	u32 val;
 	unsigned int p, n2, r2;
@@ -805,7 +813,8 @@ static struct intel_shared_dpll *hsw_ddi_hdmi_get_dpll(struct intel_crtc_state *
 
 	crtc_state->dpll_hw_state.wrpll = val;
 
-	pll = intel_find_shared_dpll(crtc_state,
+	pll = intel_find_shared_dpll(state, crtc,
+				     &crtc_state->dpll_hw_state,
 				     DPLL_ID_WRPLL1, DPLL_ID_WRPLL2);
 
 	if (!pll)
@@ -857,7 +866,7 @@ static bool hsw_get_dpll(struct intel_atomic_state *state,
 	       sizeof(crtc_state->dpll_hw_state));
 
 	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI)) {
-		pll = hsw_ddi_hdmi_get_dpll(crtc_state);
+		pll = hsw_ddi_hdmi_get_dpll(state, crtc);
 	} else if (intel_crtc_has_dp_encoder(crtc_state)) {
 		pll = hsw_ddi_dp_get_dpll(crtc_state);
 	} else if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_ANALOG)) {
@@ -867,7 +876,8 @@ static bool hsw_get_dpll(struct intel_atomic_state *state,
 		crtc_state->dpll_hw_state.spll =
 			SPLL_PLL_ENABLE | SPLL_FREQ_1350MHz | SPLL_REF_MUXED_SSC;
 
-		pll = intel_find_shared_dpll(crtc_state,
+		pll = intel_find_shared_dpll(state, crtc,
+					     &crtc_state->dpll_hw_state,
 					     DPLL_ID_SPLL, DPLL_ID_SPLL);
 	} else {
 		return false;
@@ -876,7 +886,10 @@ static bool hsw_get_dpll(struct intel_atomic_state *state,
 	if (!pll)
 		return false;
 
-	intel_reference_shared_dpll(pll, crtc_state);
+	intel_reference_shared_dpll(state, crtc,
+				    pll, &crtc_state->dpll_hw_state);
+
+	crtc_state->shared_dpll = pll;
 
 	return true;
 }
@@ -1437,17 +1450,22 @@ static bool skl_get_dpll(struct intel_atomic_state *state,
 	}
 
 	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_EDP))
-		pll = intel_find_shared_dpll(crtc_state,
+		pll = intel_find_shared_dpll(state, crtc,
+					     &crtc_state->dpll_hw_state,
 					     DPLL_ID_SKL_DPLL0,
 					     DPLL_ID_SKL_DPLL0);
 	else
-		pll = intel_find_shared_dpll(crtc_state,
+		pll = intel_find_shared_dpll(state, crtc,
+					     &crtc_state->dpll_hw_state,
 					     DPLL_ID_SKL_DPLL1,
 					     DPLL_ID_SKL_DPLL3);
 	if (!pll)
 		return false;
 
-	intel_reference_shared_dpll(pll, crtc_state);
+	intel_reference_shared_dpll(state, crtc,
+				    pll, &crtc_state->dpll_hw_state);
+
+	crtc_state->shared_dpll = pll;
 
 	return true;
 }
@@ -1880,7 +1898,10 @@ static bool bxt_get_dpll(struct intel_atomic_state *state,
 	DRM_DEBUG_KMS("[CRTC:%d:%s] using pre-allocated %s\n",
 		      crtc->base.base.id, crtc->base.name, pll->info->name);
 
-	intel_reference_shared_dpll(pll, crtc_state);
+	intel_reference_shared_dpll(state, crtc,
+				    pll, &crtc_state->dpll_hw_state);
+
+	crtc_state->shared_dpll = pll;
 
 	return true;
 }
@@ -2395,7 +2416,8 @@ static bool cnl_get_dpll(struct intel_atomic_state *state,
 		return false;
 	}
 
-	pll = intel_find_shared_dpll(crtc_state,
+	pll = intel_find_shared_dpll(state, crtc,
+				     &crtc_state->dpll_hw_state,
 				     DPLL_ID_SKL_DPLL0,
 				     DPLL_ID_SKL_DPLL2);
 	if (!pll) {
@@ -2403,7 +2425,10 @@ static bool cnl_get_dpll(struct intel_atomic_state *state,
 		return false;
 	}
 
-	intel_reference_shared_dpll(pll, crtc_state);
+	intel_reference_shared_dpll(state, crtc,
+				    pll, &crtc_state->dpll_hw_state);
+
+	crtc_state->shared_dpll = pll;
 
 	return true;
 }
@@ -2545,7 +2570,8 @@ static bool icl_calc_tbt_pll(struct intel_crtc_state *crtc_state,
 }
 
 static bool icl_calc_dpll_state(struct intel_crtc_state *crtc_state,
-				struct intel_encoder *encoder)
+				struct intel_encoder *encoder,
+				struct intel_dpll_hw_state *pll_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
 	u32 cfgcr0, cfgcr1;
@@ -2572,11 +2598,10 @@ static bool icl_calc_dpll_state(struct intel_crtc_state *crtc_state,
 		 DPLL_CFGCR1_PDIV(pll_params.pdiv) |
 		 DPLL_CFGCR1_CENTRAL_FREQ_8400;
 
-	memset(&crtc_state->dpll_hw_state, 0,
-	       sizeof(crtc_state->dpll_hw_state));
+	memset(pll_state, 0, sizeof(*pll_state));
 
-	crtc_state->dpll_hw_state.cfgcr0 = cfgcr0;
-	crtc_state->dpll_hw_state.cfgcr1 = cfgcr1;
+	pll_state->cfgcr0 = cfgcr0;
+	pll_state->cfgcr1 = cfgcr1;
 
 	return true;
 }
@@ -2666,10 +2691,10 @@ static bool icl_mg_pll_find_divisors(int clock_khz, bool is_dp, bool use_ssc,
  * The specification for this function uses real numbers, so the math had to be
  * adapted to integer-only calculation, that's why it looks so different.
  */
-static bool icl_calc_mg_pll_state(struct intel_crtc_state *crtc_state)
+static bool icl_calc_mg_pll_state(struct intel_crtc_state *crtc_state,
+				  struct intel_dpll_hw_state *pll_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
-	struct intel_dpll_hw_state *pll_state = &crtc_state->dpll_hw_state;
 	int refclk_khz = dev_priv->cdclk.hw.ref;
 	int clock = crtc_state->port_clock;
 	u32 dco_khz, m1div, m2div_int, m2div_rem, m2div_frac;
@@ -2847,7 +2872,8 @@ static bool icl_get_dplls(struct intel_atomic_state *state,
 	if (intel_port_is_combophy(dev_priv, port)) {
 		min = DPLL_ID_ICL_DPLL0;
 		max = DPLL_ID_ICL_DPLL1;
-		ret = icl_calc_dpll_state(crtc_state, encoder);
+		ret = icl_calc_dpll_state(crtc_state, encoder,
+					  &crtc_state->dpll_hw_state);
 	} else if (intel_port_is_tc(dev_priv, port)) {
 		if (encoder->type == INTEL_OUTPUT_DP_MST) {
 			struct intel_dp_mst_encoder *mst_encoder;
@@ -2861,14 +2887,16 @@ static bool icl_get_dplls(struct intel_atomic_state *state,
 		if (intel_dig_port->tc_mode == TC_PORT_TBT_ALT) {
 			min = DPLL_ID_ICL_TBTPLL;
 			max = min;
-			ret = icl_calc_dpll_state(crtc_state, encoder);
+			ret = icl_calc_dpll_state(crtc_state, encoder,
+						  &crtc_state->dpll_hw_state);
 		} else {
 			enum tc_port tc_port;
 
 			tc_port = intel_port_to_tc(dev_priv, port);
 			min = icl_tc_port_to_pll_id(tc_port);
 			max = min;
-			ret = icl_calc_mg_pll_state(crtc_state);
+			ret = icl_calc_mg_pll_state(crtc_state,
+						    &crtc_state->dpll_hw_state);
 		}
 	} else {
 		MISSING_CASE(port);
@@ -2881,13 +2909,18 @@ static bool icl_get_dplls(struct intel_atomic_state *state,
 	}
 
 
-	pll = intel_find_shared_dpll(crtc_state, min, max);
+	pll = intel_find_shared_dpll(state, crtc,
+				     &crtc_state->dpll_hw_state,
+				     min, max);
 	if (!pll) {
 		DRM_DEBUG_KMS("No PLL selected\n");
 		return false;
 	}
 
-	intel_reference_shared_dpll(pll, crtc_state);
+	intel_reference_shared_dpll(state, crtc,
+				    pll, &crtc_state->dpll_hw_state);
+
+	crtc_state->shared_dpll = pll;
 
 	return true;
 }