drm/i915: Use .disable_clock() for pll sanitation

Instead of every new platform having yet another masive
copy of the whole PLL sanitation code, let's just reuse the
.disable_clock() hook for this purpose. We do need to plug
this into the ICL+ DSI code for that, but fortunately it
already has a suitable function we can use.

We do lose the debug message though on account of not bothering
to check if the clock is actually enabled or not before turning
it off. We could introduce yet another vfunc to query the current
state, but not sure it's worth the hassle?
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210205214634.19341-14-ville.syrjala@linux.intel.com

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

@@ -1942,6 +1942,7 @@ void icl_dsi_init(struct drm_i915_private *dev_priv)
 	encoder->pipe_mask = ~0;
 	encoder->power_domain = POWER_DOMAIN_PORT_DSI;
 	encoder->get_power_domains = gen11_dsi_get_power_domains;
+	encoder->disable_clock = gen11_dsi_gate_clocks;
 
 	/* register DSI connector with DRM subsystem */
 	drm_connector_init(dev, connector, &gen11_dsi_connector_funcs,

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

@@ -1582,23 +1582,6 @@ hsw_set_signal_levels(struct intel_dp *intel_dp,
 	intel_de_posting_read(dev_priv, DDI_BUF_CTL(port));
 }
 
-static u32 icl_dpclka_cfgcr0_clk_off(struct drm_i915_private *dev_priv,
-				     enum phy phy)
-{
-	if (IS_ROCKETLAKE(dev_priv)) {
-		return RKL_DPCLKA_CFGCR0_DDI_CLK_OFF(phy);
-	} else if (intel_phy_is_combo(dev_priv, phy)) {
-		return ICL_DPCLKA_CFGCR0_DDI_CLK_OFF(phy);
-	} else if (intel_phy_is_tc(dev_priv, phy)) {
-		enum tc_port tc_port = intel_port_to_tc(dev_priv,
-							(enum port)phy);
-
-		return ICL_DPCLKA_CFGCR0_TC_CLK_OFF(tc_port);
-	}
-
-	return 0;
-}
-
 static void _cnl_ddi_enable_clock(struct drm_i915_private *i915, i915_reg_t reg,
 				  u32 clk_sel_mask, u32 clk_sel, u32 clk_off)
 {
@@ -1734,75 +1717,6 @@ static void icl_ddi_combo_disable_clock(struct intel_encoder *encoder)
 			       ICL_DPCLKA_CFGCR0_DDI_CLK_OFF(phy));
 }
 
-static void dg1_sanitize_port_clk_off(struct drm_i915_private *dev_priv,
-				      u32 port_mask, bool ddi_clk_needed)
-{
-	enum port port;
-	u32 val;
-
-	for_each_port_masked(port, port_mask) {
-		enum phy phy = intel_port_to_phy(dev_priv, port);
-		bool ddi_clk_off;
-
-		val = intel_de_read(dev_priv, DG1_DPCLKA_CFGCR0(phy));
-		ddi_clk_off = val & DG1_DPCLKA_CFGCR0_DDI_CLK_OFF(phy);
-
-		if (ddi_clk_needed == !ddi_clk_off)
-			continue;
-
-		/*
-		 * Punt on the case now where clock is gated, but it would
-		 * be needed by the port. Something else is really broken then.
-		 */
-		if (drm_WARN_ON(&dev_priv->drm, ddi_clk_needed))
-			continue;
-
-		drm_notice(&dev_priv->drm,
-			   "PHY %c is disabled with an ungated DDI clock, gate it\n",
-			   phy_name(phy));
-		val |= DG1_DPCLKA_CFGCR0_DDI_CLK_OFF(phy);
-		intel_de_write(dev_priv, DG1_DPCLKA_CFGCR0(phy), val);
-	}
-}
-
-static void icl_sanitize_port_clk_off(struct drm_i915_private *dev_priv,
-				      u32 port_mask, bool ddi_clk_needed)
-{
-	enum port port;
-	bool ddi_clk_off;
-	u32 val;
-	i915_reg_t reg;
-
-	for_each_port_masked(port, port_mask) {
-		enum phy phy = intel_port_to_phy(dev_priv, port);
-
-		if (IS_ALDERLAKE_S(dev_priv))
-			reg = ADLS_DPCLKA_CFGCR(phy);
-		else
-			reg = ICL_DPCLKA_CFGCR0;
-
-		val = intel_de_read(dev_priv, reg);
-		ddi_clk_off = val & icl_dpclka_cfgcr0_clk_off(dev_priv,
-							      phy);
-
-		if (ddi_clk_needed == !ddi_clk_off)
-			continue;
-
-		/*
-		 * Punt on the case now where clock is gated, but it would
-		 * be needed by the port. Something else is really broken then.
-		 */
-		if (drm_WARN_ON(&dev_priv->drm, ddi_clk_needed))
-			continue;
-
-		drm_notice(&dev_priv->drm,
-			   "PHY %c is disabled/in DSI mode with an ungated DDI clock, gate it\n",
-			   phy_name(phy));
-		val |= icl_dpclka_cfgcr0_clk_off(dev_priv, phy);
-		intel_de_write(dev_priv, reg, val);
-	}
-}
-
 void icl_sanitize_encoder_pll_mapping(struct intel_encoder *encoder)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
@@ -1855,10 +1769,8 @@ void icl_sanitize_encoder_pll_mapping(struct intel_encoder *encoder)
 		ddi_clk_needed = false;
 	}
 
-	if (IS_DG1(dev_priv))
-		dg1_sanitize_port_clk_off(dev_priv, port_mask, ddi_clk_needed);
-	else
-		icl_sanitize_port_clk_off(dev_priv, port_mask, ddi_clk_needed);
+	if (!ddi_clk_needed && encoder->disable_clock)
+		encoder->disable_clock(encoder);
 }
 
 static void jsl_ddi_tc_enable_clock(struct intel_encoder *encoder,