[Intel-gfx] [PATCH v3 24/28] drm/i915/dg1: enable PORT C/D aka D/E

[Lucas De Marchi]

For DG1 we have a little of mix up wrt to DDI/port names and indexes.
Bspec refers to the ports as DDIA, DDIB, DDI USBC1 and DDI USBC2
(besides the DDIA, DDIB, DDIC, DDID), but the previous naming is the
most unambiguous one. This means that for any register on Display Engine
we should use the index of A, B, D and E. However in some places this is
not true:

- VBT: uses C and D and have to be mapped to D/E

- IO/Combo: uses C and D, but we already differentiate those when
  we created the phy vs port distinction.

Ths additional mapping for VBT and phy are already covered in previous
patches, so now we can initialize the DDI as D/E.

Cc: Clinton Taylor <Clinton.A.Taylor at intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index f5d834fa82eb..fdc46dd5e8fe 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -7230,10 +7230,7 @@ bool intel_phy_is_combo(struct drm_i915_private *dev_priv, enum phy phy)
 {
 	if (phy == PHY_NONE)
 		return false;
-	else if (IS_DG1(dev_priv))
-		/* FIXME: Enable only two ports for now */
-		return phy <= PHY_B;
-	else if (IS_ROCKETLAKE(dev_priv))
+	else if (IS_DG1(dev_priv) || IS_ROCKETLAKE(dev_priv))
 		return phy <= PHY_D;
 	else if (IS_ELKHARTLAKE(dev_priv))
 		return phy <= PHY_C;
@@ -7257,7 +7254,7 @@ bool intel_phy_is_tc(struct drm_i915_private *dev_priv, enum phy phy)
 
 enum phy intel_port_to_phy(struct drm_i915_private *i915, enum port port)
 {
-	if (IS_ROCKETLAKE(i915) && port >= PORT_D)
+	if ((IS_DG1(i915) || IS_ROCKETLAKE(i915)) && port >= PORT_D)
 		return (enum phy)port - 1;
 	else if (IS_ELKHARTLAKE(i915) && port == PORT_D)
 		return PHY_A;
@@ -16867,9 +16864,18 @@ static void intel_setup_outputs(struct drm_i915_private *dev_priv)
 		return;
 
 	if (IS_DG1(dev_priv)) {
-		/* FIXME: Enable only two ports for now */
 		intel_ddi_init(dev_priv, PORT_A);
 		intel_ddi_init(dev_priv, PORT_B);
+
+		/*
+		 * Bspec lists the ports as A, B, C (USBC1) and D (USBC2).
+		 * However from the Display Engine perspective all registers are
+		 * actually wired to handle C and D as offsets of D/E. Instead
+		 * of fighting all our macros for handling them specially for
+		 * DG1, just call them D/E
+		 */
+		intel_ddi_init(dev_priv, PORT_D);
+		intel_ddi_init(dev_priv, PORT_E);
 	} else if (IS_ROCKETLAKE(dev_priv)) {
 		intel_ddi_init(dev_priv, PORT_A);
 		intel_ddi_init(dev_priv, PORT_B);
-- 
2.26.2