drm/i915: Flip VBT DDC pin maps around

Swap the roles of the index vs. value for the VBT DDC pin
mapping tables. This is not strictly necessary for DDC pins
but it will make this work exactly like the AUX CH mapping
tables where the role reversal is necessary (or at least makes
things easier). Consistency is good.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230509160206.25971-2-ville.syrjala@linux.intel.comReviewed-by: Gustavo Sousa <gustavo.sousa@intel.com>

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

@@ -2141,58 +2141,58 @@ static u8 translate_iboost(u8 val)
 
 static const u8 cnp_ddc_pin_map[] = {
 	[0] = 0, /* N/A */
-	[DDC_BUS_DDI_B] = GMBUS_PIN_1_BXT,
-	[DDC_BUS_DDI_C] = GMBUS_PIN_2_BXT,
-	[DDC_BUS_DDI_D] = GMBUS_PIN_4_CNP, /* sic */
-	[DDC_BUS_DDI_F] = GMBUS_PIN_3_BXT, /* sic */
+	[GMBUS_PIN_1_BXT] = DDC_BUS_DDI_B,
+	[GMBUS_PIN_2_BXT] = DDC_BUS_DDI_C,
+	[GMBUS_PIN_4_CNP] = DDC_BUS_DDI_D, /* sic */
+	[GMBUS_PIN_3_BXT] = DDC_BUS_DDI_F, /* sic */
 };
 
 static const u8 icp_ddc_pin_map[] = {
-	[ICL_DDC_BUS_DDI_A] = GMBUS_PIN_1_BXT,
-	[ICL_DDC_BUS_DDI_B] = GMBUS_PIN_2_BXT,
-	[TGL_DDC_BUS_DDI_C] = GMBUS_PIN_3_BXT,
-	[ICL_DDC_BUS_PORT_1] = GMBUS_PIN_9_TC1_ICP,
-	[ICL_DDC_BUS_PORT_2] = GMBUS_PIN_10_TC2_ICP,
-	[ICL_DDC_BUS_PORT_3] = GMBUS_PIN_11_TC3_ICP,
-	[ICL_DDC_BUS_PORT_4] = GMBUS_PIN_12_TC4_ICP,
-	[TGL_DDC_BUS_PORT_5] = GMBUS_PIN_13_TC5_TGP,
-	[TGL_DDC_BUS_PORT_6] = GMBUS_PIN_14_TC6_TGP,
+	[GMBUS_PIN_1_BXT] = ICL_DDC_BUS_DDI_A,
+	[GMBUS_PIN_2_BXT] = ICL_DDC_BUS_DDI_B,
+	[GMBUS_PIN_3_BXT] = TGL_DDC_BUS_DDI_C,
+	[GMBUS_PIN_9_TC1_ICP] = ICL_DDC_BUS_PORT_1,
+	[GMBUS_PIN_10_TC2_ICP] = ICL_DDC_BUS_PORT_2,
+	[GMBUS_PIN_11_TC3_ICP] = ICL_DDC_BUS_PORT_3,
+	[GMBUS_PIN_12_TC4_ICP] = ICL_DDC_BUS_PORT_4,
+	[GMBUS_PIN_13_TC5_TGP] = TGL_DDC_BUS_PORT_5,
+	[GMBUS_PIN_14_TC6_TGP] = TGL_DDC_BUS_PORT_6,
 };
 
 static const u8 rkl_pch_tgp_ddc_pin_map[] = {
-	[ICL_DDC_BUS_DDI_A] = GMBUS_PIN_1_BXT,
-	[ICL_DDC_BUS_DDI_B] = GMBUS_PIN_2_BXT,
-	[RKL_DDC_BUS_DDI_D] = GMBUS_PIN_9_TC1_ICP,
-	[RKL_DDC_BUS_DDI_E] = GMBUS_PIN_10_TC2_ICP,
+	[GMBUS_PIN_1_BXT] = ICL_DDC_BUS_DDI_A,
+	[GMBUS_PIN_2_BXT] = ICL_DDC_BUS_DDI_B,
+	[GMBUS_PIN_9_TC1_ICP] = RKL_DDC_BUS_DDI_D,
+	[GMBUS_PIN_10_TC2_ICP] = RKL_DDC_BUS_DDI_E,
 };
 
 static const u8 adls_ddc_pin_map[] = {
-	[ICL_DDC_BUS_DDI_A] = GMBUS_PIN_1_BXT,
-	[ADLS_DDC_BUS_PORT_TC1] = GMBUS_PIN_9_TC1_ICP,
-	[ADLS_DDC_BUS_PORT_TC2] = GMBUS_PIN_10_TC2_ICP,
-	[ADLS_DDC_BUS_PORT_TC3] = GMBUS_PIN_11_TC3_ICP,
-	[ADLS_DDC_BUS_PORT_TC4] = GMBUS_PIN_12_TC4_ICP,
+	[GMBUS_PIN_1_BXT] = ICL_DDC_BUS_DDI_A,
+	[GMBUS_PIN_9_TC1_ICP] = ADLS_DDC_BUS_PORT_TC1,
+	[GMBUS_PIN_10_TC2_ICP] = ADLS_DDC_BUS_PORT_TC2,
+	[GMBUS_PIN_11_TC3_ICP] = ADLS_DDC_BUS_PORT_TC3,
+	[GMBUS_PIN_12_TC4_ICP] = ADLS_DDC_BUS_PORT_TC4,
 };
 
 static const u8 gen9bc_tgp_ddc_pin_map[] = {
-	[DDC_BUS_DDI_B] = GMBUS_PIN_2_BXT,
-	[DDC_BUS_DDI_C] = GMBUS_PIN_9_TC1_ICP,
-	[DDC_BUS_DDI_D] = GMBUS_PIN_10_TC2_ICP,
+	[GMBUS_PIN_2_BXT] = DDC_BUS_DDI_B,
+	[GMBUS_PIN_9_TC1_ICP] = DDC_BUS_DDI_C,
+	[GMBUS_PIN_10_TC2_ICP] = DDC_BUS_DDI_D,
 };
 
 static const u8 adlp_ddc_pin_map[] = {
-	[ICL_DDC_BUS_DDI_A] = GMBUS_PIN_1_BXT,
-	[ICL_DDC_BUS_DDI_B] = GMBUS_PIN_2_BXT,
-	[ADLP_DDC_BUS_PORT_TC1] = GMBUS_PIN_9_TC1_ICP,
-	[ADLP_DDC_BUS_PORT_TC2] = GMBUS_PIN_10_TC2_ICP,
-	[ADLP_DDC_BUS_PORT_TC3] = GMBUS_PIN_11_TC3_ICP,
-	[ADLP_DDC_BUS_PORT_TC4] = GMBUS_PIN_12_TC4_ICP,
+	[GMBUS_PIN_1_BXT] = ICL_DDC_BUS_DDI_A,
+	[GMBUS_PIN_2_BXT] = ICL_DDC_BUS_DDI_B,
+	[GMBUS_PIN_9_TC1_ICP] = ADLP_DDC_BUS_PORT_TC1,
+	[GMBUS_PIN_10_TC2_ICP] = ADLP_DDC_BUS_PORT_TC2,
+	[GMBUS_PIN_11_TC3_ICP] = ADLP_DDC_BUS_PORT_TC3,
+	[GMBUS_PIN_12_TC4_ICP] = ADLP_DDC_BUS_PORT_TC4,
 };
 
 static u8 map_ddc_pin(struct drm_i915_private *i915, u8 vbt_pin)
 {
 	const u8 *ddc_pin_map;
-	int n_entries;
+	int i, n_entries;
 
 	if (HAS_PCH_MTP(i915) || IS_ALDERLAKE_P(i915)) {
 		ddc_pin_map = adlp_ddc_pin_map;
@@ -2219,8 +2219,10 @@ static u8 map_ddc_pin(struct drm_i915_private *i915, u8 vbt_pin)
 		return vbt_pin;
 	}
 
-	if (vbt_pin < n_entries && ddc_pin_map[vbt_pin] != 0)
-		return ddc_pin_map[vbt_pin];
+	for (i = 0; i < n_entries; i++) {
+		if (ddc_pin_map[i] == vbt_pin)
+			return i;
+	}
 
 	drm_dbg_kms(&i915->drm,
 		    "Ignoring alternate pin: VBT claims DDC pin %d, which is not valid for this platform\n",