drm/i915/icl: Fix DDI/TC port clk_off bits

DDI/TC clock-off bits are not equally distanced. TC1-3 bits are
from offset 12 & TC4 is at offset 21.
Create a function to choose correct clk-off bit.

v2: Add fixes tag (Lucas)

Fixes: c27e917e2bda ("drm/i915/icl: add basic support for the ICL clocks")
Signed-off-by: Mahesh Kumar <[e-mail]>
Signed-off-by: Vandita Kulkarni <[e-mail]>
Reviewed-by: Lucas De Marchi <[e-mail]>
Signed-off-by: Rodrigo Vivi <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/i915/i915_reg.h

···
 #define DPCLKA_CFGCR0_ICL			_MMIO(0x164280)
 #define  DPCLKA_CFGCR0_DDI_CLK_OFF(port)	(1 << ((port) ==  PORT_F ? 23 : \
 						      (port) + 10))
+#define  ICL_DPCLKA_CFGCR0_DDI_CLK_OFF(port)   (1 << ((port) + 10))
+#define  ICL_DPCLKA_CFGCR0_TC_CLK_OFF(tc_port) (1 << ((tc_port) == PORT_TC4 ? \
+						      21 : (tc_port) + 12))
 #define  DPCLKA_CFGCR0_DDI_CLK_SEL_SHIFT(port)	((port) == PORT_F ? 21 : \
 						(port) * 2)
 #define  DPCLKA_CFGCR0_DDI_CLK_SEL_MASK(port)	(3 << DPCLKA_CFGCR0_DDI_CLK_SEL_SHIFT(port))

drivers/gpu/drm/i915/intel_ddi.c

···
 	return DDI_BUF_TRANS_SELECT(level);
 }
 
+static inline
+uint32_t icl_dpclka_cfgcr0_clk_off(struct drm_i915_private *dev_priv,
+				   enum port port)
+{
+	if (intel_port_is_combophy(dev_priv, port)) {
+		return ICL_DPCLKA_CFGCR0_DDI_CLK_OFF(port);
+	} else if (intel_port_is_tc(dev_priv, port)) {
+		enum tc_port tc_port = intel_port_to_tc(dev_priv, port);
+
+		return ICL_DPCLKA_CFGCR0_TC_CLK_OFF(tc_port);
+	}
+
+	return 0;
+}
+
 void icl_map_plls_to_ports(struct drm_crtc *crtc,
 			   struct intel_crtc_state *crtc_state,
 			   struct drm_atomic_state *old_state)
···
 		mutex_lock(&dev_priv->dpll_lock);
 
 		val = I915_READ(DPCLKA_CFGCR0_ICL);
-		WARN_ON((val & DPCLKA_CFGCR0_DDI_CLK_OFF(port)) == 0);
+		WARN_ON((val & icl_dpclka_cfgcr0_clk_off(dev_priv, port)) == 0);
 
 		if (intel_port_is_combophy(dev_priv, port)) {
 			val &= ~DPCLKA_CFGCR0_DDI_CLK_SEL_MASK(port);
···
 			POSTING_READ(DPCLKA_CFGCR0_ICL);
 		}
 
-		val &= ~DPCLKA_CFGCR0_DDI_CLK_OFF(port);
+		val &= ~icl_dpclka_cfgcr0_clk_off(dev_priv, port);
 		I915_WRITE(DPCLKA_CFGCR0_ICL, val);
 
 		mutex_unlock(&dev_priv->dpll_lock);
···
 		mutex_lock(&dev_priv->dpll_lock);
 		I915_WRITE(DPCLKA_CFGCR0_ICL,
 			   I915_READ(DPCLKA_CFGCR0_ICL) |
-			   DPCLKA_CFGCR0_DDI_CLK_OFF(port));
+			   icl_dpclka_cfgcr0_clk_off(dev_priv, port));
 		mutex_unlock(&dev_priv->dpll_lock);
 	}
 }