drm/i915: Parametrize DDI_BUF_TRANS registers

FIXME: Should there be a WARN(i != 9) or something, or what does the
entry 9 comment mean?
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: NJani Nikula <jani.nikula@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_reg.h

@@ -7197,7 +7197,8 @@ enum skl_disp_power_wells {
 /* DDI Buffer Translations */
 #define DDI_BUF_TRANS_A				0x64E00
 #define DDI_BUF_TRANS_B				0x64E60
-#define DDI_BUF_TRANS(port) _PORT(port, DDI_BUF_TRANS_A, DDI_BUF_TRANS_B)
+#define DDI_BUF_TRANS_LO(port, i) (_PORT(port, DDI_BUF_TRANS_A, DDI_BUF_TRANS_B) + (i) * 8)
+#define DDI_BUF_TRANS_HI(port, i) (_PORT(port, DDI_BUF_TRANS_A, DDI_BUF_TRANS_B) + (i) * 8 + 4)
 
 /* Sideband Interface (SBI) is programmed indirectly, via
  * SBI_ADDR, which contains the register offset; and SBI_DATA,

drivers/gpu/drm/i915/intel_ddi.c

@@ -414,7 +414,6 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev, enum port port,
 				      bool supports_hdmi)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	u32 reg;
 	u32 iboost_bit = 0;
 	int i, n_hdmi_entries, n_dp_entries, n_edp_entries, hdmi_default_entry,
 	    size;
@@ -505,11 +504,11 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev, enum port port,
 		BUG();
 	}
 
-	for (i = 0, reg = DDI_BUF_TRANS(port); i < size; i++) {
-		I915_WRITE(reg, ddi_translations[i].trans1 | iboost_bit);
-		reg += 4;
-		I915_WRITE(reg, ddi_translations[i].trans2);
-		reg += 4;
+	for (i = 0; i < size; i++) {
+		I915_WRITE(DDI_BUF_TRANS_LO(port, i),
+			   ddi_translations[i].trans1 | iboost_bit);
+		I915_WRITE(DDI_BUF_TRANS_HI(port, i),
+			   ddi_translations[i].trans2);
 	}
 
 	if (!supports_hdmi)
@@ -521,10 +520,10 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev, enum port port,
 		hdmi_level = hdmi_default_entry;
 
 	/* Entry 9 is for HDMI: */
-	I915_WRITE(reg, ddi_translations_hdmi[hdmi_level].trans1 | iboost_bit);
-	reg += 4;
-	I915_WRITE(reg, ddi_translations_hdmi[hdmi_level].trans2);
-	reg += 4;
+	I915_WRITE(DDI_BUF_TRANS_LO(port, i),
+		   ddi_translations_hdmi[hdmi_level].trans1 | iboost_bit);
+	I915_WRITE(DDI_BUF_TRANS_HI(port, i),
+		   ddi_translations_hdmi[hdmi_level].trans2);
 }
 
 /* Program DDI buffers translations for DP. By default, program ports A-D in DP