drm/i915: Extract hsw_ddi_{enable,disable}_clock()

Yank out the HSW/BDW code from intel_ddi_clk_{select,disable}()
and put it into the new encoder .{enable,disable}_clock() vfuncs.

v2: s/dev_priv/i915/ (Lucas)
v3: Deal with FDI

Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com> #v2
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210205214634.19341-4-ville.syrjala@linux.intel.com

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

@@ -1076,6 +1076,8 @@ void intel_crt_init(struct drm_i915_private *dev_priv)
 		crt->base.enable = hsw_enable_crt;
 		crt->base.disable = hsw_disable_crt;
 		crt->base.post_disable = hsw_post_disable_crt;
+		crt->base.enable_clock = hsw_ddi_enable_clock;
+		crt->base.disable_clock = hsw_ddi_disable_clock;
 	} else {
 		if (HAS_PCH_SPLIT(dev_priv)) {
 			crt->base.compute_config = pch_crt_compute_config;

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

@@ -1898,9 +1898,6 @@ void intel_ddi_clk_select(struct intel_encoder *encoder,
 
 		intel_de_write(dev_priv, DPLL_CTRL2, val);
 
-	} else if (INTEL_GEN(dev_priv) < 9) {
-		intel_de_write(dev_priv, PORT_CLK_SEL(port),
-			       hsw_pll_to_ddi_pll_sel(pll));
 	}
 
 	mutex_unlock(&dev_priv->dpll.lock);
@@ -1923,12 +1920,30 @@ static void intel_ddi_clk_disable(struct intel_encoder *encoder)
 	} else if (IS_GEN9_BC(dev_priv)) {
 		intel_de_write(dev_priv, DPLL_CTRL2,
 			       intel_de_read(dev_priv, DPLL_CTRL2) | DPLL_CTRL2_DDI_CLK_OFF(port));
-	} else if (INTEL_GEN(dev_priv) < 9) {
-		intel_de_write(dev_priv, PORT_CLK_SEL(port),
-			       PORT_CLK_SEL_NONE);
 	}
 }
 
+void hsw_ddi_enable_clock(struct intel_encoder *encoder,
+			  const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	const struct intel_shared_dpll *pll = crtc_state->shared_dpll;
+	enum port port = encoder->port;
+
+	if (drm_WARN_ON(&i915->drm, !pll))
+		return;
+
+	intel_de_write(i915, PORT_CLK_SEL(port), hsw_pll_to_ddi_pll_sel(pll));
+}
+
+void hsw_ddi_disable_clock(struct intel_encoder *encoder)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	enum port port = encoder->port;
+
+	intel_de_write(i915, PORT_CLK_SEL(port), PORT_CLK_SEL_NONE);
+}
+
 void intel_ddi_enable_clock(struct intel_encoder *encoder,
 			    const struct intel_crtc_state *crtc_state)
 {
@@ -4083,6 +4098,11 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
 	encoder->cloneable = 0;
 	encoder->pipe_mask = ~0;
 
+	if (IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv)) {
+		encoder->enable_clock = hsw_ddi_enable_clock;
+		encoder->disable_clock = hsw_ddi_disable_clock;
+	}
+
 	if (IS_DG1(dev_priv))
 		encoder->hpd_pin = dg1_hpd_pin(dev_priv, port);
 	else if (IS_ROCKETLAKE(dev_priv))

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

@@ -30,6 +30,9 @@ void intel_ddi_fdi_post_disable(struct intel_atomic_state *state,
 				const struct drm_connector_state *old_conn_state);
 void intel_ddi_enable_clock(struct intel_encoder *encoder,
 			    const struct intel_crtc_state *crtc_state);
+void hsw_ddi_enable_clock(struct intel_encoder *encoder,
+			  const struct intel_crtc_state *crtc_state);
+void hsw_ddi_disable_clock(struct intel_encoder *encoder);
 void intel_prepare_dp_ddi_buffers(struct intel_encoder *encoder,
 				  const struct intel_crtc_state *crtc_state);
 void intel_wait_ddi_buf_idle(struct drm_i915_private *dev_priv,