drm/i915: Extract i9xx_dpll_get_hw_state()

Start making the GMCH DPLL code a bit more like the more modern
platforms by separating out the DPLL hw state readout from the
rest of the pipe readout.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240412182703.19916-8-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

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

@@ -3071,19 +3071,16 @@ static bool i9xx_get_pipe_config(struct intel_crtc *crtc,
 
 	i9xx_get_pfit_config(pipe_config);
 
+	i9xx_dpll_get_hw_state(crtc, &pipe_config->dpll_hw_state);
+
 	if (DISPLAY_VER(dev_priv) >= 4) {
-		/* No way to read it out on pipes B and C */
-		if (IS_CHERRYVIEW(dev_priv) && crtc->pipe != PIPE_A)
-			tmp = dev_priv->display.state.chv_dpll_md[crtc->pipe];
-		else
-			tmp = intel_de_read(dev_priv, DPLL_MD(crtc->pipe));
+		tmp = pipe_config->dpll_hw_state.dpll_md;
 		pipe_config->pixel_multiplier =
 			((tmp & DPLL_MD_UDI_MULTIPLIER_MASK)
 			 >> DPLL_MD_UDI_MULTIPLIER_SHIFT) + 1;
-		pipe_config->dpll_hw_state.dpll_md = tmp;
 	} else if (IS_I945G(dev_priv) || IS_I945GM(dev_priv) ||
 		   IS_G33(dev_priv) || IS_PINEVIEW(dev_priv)) {
-		tmp = intel_de_read(dev_priv, DPLL(crtc->pipe));
+		tmp = pipe_config->dpll_hw_state.dpll;
 		pipe_config->pixel_multiplier =
 			((tmp & SDVO_MULTIPLIER_MASK)
 			 >> SDVO_MULTIPLIER_SHIFT_HIRES) + 1;
@@ -3093,19 +3090,6 @@ static bool i9xx_get_pipe_config(struct intel_crtc *crtc,
 		 * function. */
 		pipe_config->pixel_multiplier = 1;
 	}
-	pipe_config->dpll_hw_state.dpll = intel_de_read(dev_priv,
-							DPLL(crtc->pipe));
-	if (!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv)) {
-		pipe_config->dpll_hw_state.fp0 = intel_de_read(dev_priv,
-							       FP0(crtc->pipe));
-		pipe_config->dpll_hw_state.fp1 = intel_de_read(dev_priv,
-							       FP1(crtc->pipe));
-	} else {
-		/* Mask out read-only status bits. */
-		pipe_config->dpll_hw_state.dpll &= ~(DPLL_LOCK_VLV |
-						     DPLL_PORTC_READY_MASK |
-						     DPLL_PORTB_READY_MASK);
-	}
 
 	if (IS_CHERRYVIEW(dev_priv))
 		chv_crtc_clock_get(crtc, pipe_config);

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

@@ -385,6 +385,36 @@ static int i9xx_pll_refclk(struct drm_device *dev,
 		return 48000;
 }
 
+void i9xx_dpll_get_hw_state(struct intel_crtc *crtc,
+			    struct intel_dpll_hw_state *hw_state)
+{
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+
+	if (DISPLAY_VER(dev_priv) >= 4) {
+		u32 tmp;
+
+		/* No way to read it out on pipes B and C */
+		if (IS_CHERRYVIEW(dev_priv) && crtc->pipe != PIPE_A)
+			tmp = dev_priv->display.state.chv_dpll_md[crtc->pipe];
+		else
+			tmp = intel_de_read(dev_priv, DPLL_MD(crtc->pipe));
+
+		hw_state->dpll_md = tmp;
+	}
+
+	hw_state->dpll = intel_de_read(dev_priv, DPLL(crtc->pipe));
+
+	if (!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv)) {
+		hw_state->fp0 = intel_de_read(dev_priv, FP0(crtc->pipe));
+		hw_state->fp1 = intel_de_read(dev_priv, FP1(crtc->pipe));
+	} else {
+		/* Mask out read-only status bits. */
+		hw_state->dpll &= ~(DPLL_LOCK_VLV |
+				    DPLL_PORTC_READY_MASK |
+				    DPLL_PORTB_READY_MASK);
+	}
+}
+
 /* Returns the clock of the currently programmed mode of the given pipe. */
 void i9xx_crtc_clock_get(struct intel_crtc *crtc,
 			 struct intel_crtc_state *pipe_config)

drivers/gpu/drm/i915/display/intel_dpll.h

@@ -13,6 +13,7 @@ struct drm_i915_private;
 struct intel_atomic_state;
 struct intel_crtc;
 struct intel_crtc_state;
+struct intel_dpll_hw_state;
 enum pipe;
 
 void intel_dpll_init_clock_hook(struct drm_i915_private *dev_priv);
@@ -22,6 +23,8 @@ int intel_dpll_crtc_get_shared_dpll(struct intel_atomic_state *state,
 				    struct intel_crtc *crtc);
 int i9xx_calc_dpll_params(int refclk, struct dpll *clock);
 u32 i9xx_dpll_compute_fp(const struct dpll *dpll);
+void i9xx_dpll_get_hw_state(struct intel_crtc *crtc,
+			    struct intel_dpll_hw_state *hw_state);
 void vlv_compute_dpll(struct intel_crtc_state *crtc_state);
 void chv_compute_dpll(struct intel_crtc_state *crtc_state);