drm/i915/skl: Update DDI buffer translation programming.

SKL-Y can now use the same programming for all VccIO values after an
adjustment to I_boost.  SKL-U DP table adjustments.

1. Remove SKL Y 0.95V from "SKL H and S" columns in all tables. The
   other SKL Y column removes the "0.85V VccIO" so it now applies to all
   voltages.

2. DP table changes SKL U 400mV+0db dword 0 value from 2016h to 201Bh.

3. DP table changes SKL U 600mv+0db dword 0 value from 2016h to 201Bh.

4. DP table increases I_boost to level 3 for SKL Y 400mv+9.5db.

v2: Fix compilation warnings as pointed by Paulo.

Reference: Graphics Spec Change r97962
Cc: Arthur Runyan <arthur.j.runyan@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
[Jani: reformatted commit message for shorter lines.]
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/intel_ddi.c

@@ -128,7 +128,7 @@ static const struct ddi_buf_trans bdw_ddi_translations_hdmi[] = {
 	{ 0x80FFFFFF, 0x001B0002, 0x0 },/* 9:	1000	1000	0	*/
 };
 
-/* Skylake H, S, and Skylake Y with 0.95V VccIO */
+/* Skylake H and S */
 static const struct ddi_buf_trans skl_ddi_translations_dp[] = {
 	{ 0x00002016, 0x000000A0, 0x0 },
 	{ 0x00005012, 0x0000009B, 0x0 },
@@ -143,23 +143,23 @@ static const struct ddi_buf_trans skl_ddi_translations_dp[] = {
 
 /* Skylake U */
 static const struct ddi_buf_trans skl_u_ddi_translations_dp[] = {
-	{ 0x00002016, 0x000000A2, 0x0 },
+	{ 0x0000201B, 0x000000A2, 0x0 },
 	{ 0x00005012, 0x00000088, 0x0 },
 	{ 0x00007011, 0x00000087, 0x0 },
-	{ 0x80009010, 0x000000C7, 0x1 },	/* Uses I_boost */
-	{ 0x00002016, 0x0000009D, 0x0 },
+	{ 0x80009010, 0x000000C7, 0x1 },	/* Uses I_boost level 0x1 */
+	{ 0x0000201B, 0x0000009D, 0x0 },
 	{ 0x00005012, 0x000000C7, 0x0 },
 	{ 0x00007011, 0x000000C7, 0x0 },
 	{ 0x00002016, 0x00000088, 0x0 },
 	{ 0x00005012, 0x000000C7, 0x0 },
 };
 
-/* Skylake Y with 0.85V VccIO */
-static const struct ddi_buf_trans skl_y_085v_ddi_translations_dp[] = {
+/* Skylake Y */
+static const struct ddi_buf_trans skl_y_ddi_translations_dp[] = {
 	{ 0x00000018, 0x000000A2, 0x0 },
 	{ 0x00005012, 0x00000088, 0x0 },
 	{ 0x00007011, 0x00000087, 0x0 },
-	{ 0x80009010, 0x000000C7, 0x1 },	/* Uses I_boost */
+	{ 0x80009010, 0x000000C7, 0x3 },	/* Uses I_boost level 0x3 */
 	{ 0x00000018, 0x0000009D, 0x0 },
 	{ 0x00005012, 0x000000C7, 0x0 },
 	{ 0x00007011, 0x000000C7, 0x0 },
@@ -168,7 +168,7 @@ static const struct ddi_buf_trans skl_y_085v_ddi_translations_dp[] = {
 };
 
 /*
- * Skylake H and S, and Skylake Y with 0.95V VccIO
+ * Skylake H and S
  * eDP 1.4 low vswing translation parameters
  */
 static const struct ddi_buf_trans skl_ddi_translations_edp[] = {
@@ -202,10 +202,10 @@ static const struct ddi_buf_trans skl_u_ddi_translations_edp[] = {
 };
 
 /*
- * Skylake Y with 0.95V VccIO
+ * Skylake Y
  * eDP 1.4 low vswing translation parameters
  */
-static const struct ddi_buf_trans skl_y_085v_ddi_translations_edp[] = {
+static const struct ddi_buf_trans skl_y_ddi_translations_edp[] = {
 	{ 0x00000018, 0x000000A8, 0x0 },
 	{ 0x00004013, 0x000000AB, 0x0 },
 	{ 0x00007011, 0x000000A4, 0x0 },
@@ -218,7 +218,7 @@ static const struct ddi_buf_trans skl_y_085v_ddi_translations_edp[] = {
 	{ 0x00000018, 0x0000008A, 0x0 },
 };
 
-/* Skylake H, S and U, and Skylake Y with 0.95V VccIO */
+/* Skylake U, H and S */
 static const struct ddi_buf_trans skl_ddi_translations_hdmi[] = {
 	{ 0x00000018, 0x000000AC, 0x0 },
 	{ 0x00005012, 0x0000009D, 0x0 },
@@ -233,8 +233,8 @@ static const struct ddi_buf_trans skl_ddi_translations_hdmi[] = {
 	{ 0x00000018, 0x000000C7, 0x0 },
 };
 
-/* Skylake Y with 0.85V VccIO */
-static const struct ddi_buf_trans skl_y_085v_ddi_translations_hdmi[] = {
+/* Skylake Y */
+static const struct ddi_buf_trans skl_y_ddi_translations_hdmi[] = {
 	{ 0x00000018, 0x000000A1, 0x0 },
 	{ 0x00005012, 0x000000DF, 0x0 },
 	{ 0x00007011, 0x00000084, 0x0 },
@@ -244,7 +244,7 @@ static const struct ddi_buf_trans skl_y_085v_ddi_translations_hdmi[] = {
 	{ 0x00006013, 0x000000C7, 0x0 },
 	{ 0x00000018, 0x0000008A, 0x0 },
 	{ 0x00003015, 0x000000C7, 0x0 },	/* Default */
-	{ 0x80003015, 0x000000C7, 0x7 },	/* Uses I_boost */
+	{ 0x80003015, 0x000000C7, 0x7 },	/* Uses I_boost level 0x7 */
 	{ 0x00000018, 0x000000C7, 0x0 },
 };
 
@@ -335,19 +335,11 @@ intel_dig_port_supports_hdmi(const struct intel_digital_port *intel_dig_port)
 static const struct ddi_buf_trans *skl_get_buf_trans_dp(struct drm_device *dev,
 							int *n_entries)
 {
-	struct drm_i915_private *dev_priv = dev->dev_private;
 	const struct ddi_buf_trans *ddi_translations;
-	static int is_095v = -1;
-
-	if (is_095v == -1) {
-		u32 spr1 = I915_READ(UAIMI_SPR1);
-
-		is_095v = spr1 & SKL_VCCIO_MASK;
-	}
 
-	if (IS_SKL_ULX(dev) && !is_095v) {
-		ddi_translations = skl_y_085v_ddi_translations_dp;
-		*n_entries = ARRAY_SIZE(skl_y_085v_ddi_translations_dp);
+	if (IS_SKL_ULX(dev)) {
+		ddi_translations = skl_y_ddi_translations_dp;
+		*n_entries = ARRAY_SIZE(skl_y_ddi_translations_dp);
 	} else if (IS_SKL_ULT(dev)) {
 		ddi_translations = skl_u_ddi_translations_dp;
 		*n_entries = ARRAY_SIZE(skl_u_ddi_translations_dp);
@@ -364,23 +356,14 @@ static const struct ddi_buf_trans *skl_get_buf_trans_edp(struct drm_device *dev,
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	const struct ddi_buf_trans *ddi_translations;
-	static int is_095v = -1;
-
-	if (is_095v == -1) {
-		u32 spr1 = I915_READ(UAIMI_SPR1);
 
-		is_095v = spr1 & SKL_VCCIO_MASK;
-	}
-
-	if (IS_SKL_ULX(dev) && !is_095v) {
+	if (IS_SKL_ULX(dev)) {
 		if (dev_priv->edp_low_vswing) {
-			ddi_translations = skl_y_085v_ddi_translations_edp;
-			*n_entries =
-				ARRAY_SIZE(skl_y_085v_ddi_translations_edp);
+			ddi_translations = skl_y_ddi_translations_edp;
+			*n_entries = ARRAY_SIZE(skl_y_ddi_translations_edp);
 		} else {
-			ddi_translations = skl_y_085v_ddi_translations_dp;
-			*n_entries =
-				ARRAY_SIZE(skl_y_085v_ddi_translations_dp);
+			ddi_translations = skl_y_ddi_translations_dp;
+			*n_entries = ARRAY_SIZE(skl_y_ddi_translations_dp);
 		}
 	} else if (IS_SKL_ULT(dev)) {
 		if (dev_priv->edp_low_vswing) {
@@ -407,19 +390,11 @@ static const struct ddi_buf_trans *
 skl_get_buf_trans_hdmi(struct drm_device *dev,
 		       int *n_entries)
 {
-	struct drm_i915_private *dev_priv = dev->dev_private;
 	const struct ddi_buf_trans *ddi_translations;
-	static int is_095v = -1;
-
-	if (is_095v == -1) {
-		u32 spr1 = I915_READ(UAIMI_SPR1);
-
-		is_095v = spr1 & SKL_VCCIO_MASK;
-	}
 
-	if (IS_SKL_ULX(dev) && !is_095v) {
-		ddi_translations = skl_y_085v_ddi_translations_hdmi;
-		*n_entries = ARRAY_SIZE(skl_y_085v_ddi_translations_hdmi);
+	if (IS_SKL_ULX(dev)) {
+		ddi_translations = skl_y_ddi_translations_hdmi;
+		*n_entries = ARRAY_SIZE(skl_y_ddi_translations_hdmi);
 	} else {
 		ddi_translations = skl_ddi_translations_hdmi;
 		*n_entries = ARRAY_SIZE(skl_ddi_translations_hdmi);