[Intel-gfx] [PATCH] drm/i915/hotplug: Use phy to get the hpd_pin instead of the port (v3)

[Vivek Kasireddy]

On some platforms such as Elkhart Lake, although we may use DDI D
to drive a connector, we have to use PHY A (Combo Phy PORT A) to
detect the hotplug interrupts as per the spec because there is no
one-to-one mapping between DDIs and PHYs. Therefore, use the
function intel_port_to_phy() which contains the logic for such
mapping(s) to find the correct hpd_pin.

This change should not affect other platforms as there is always
a one-to-one mapping between DDIs and PHYs.

v2:
- Convert the case statements to use PHYs instead of PORTs (Jani)

v3:
- Refactor the function to reduce the number of return statements by
  lumping all the case statements together except PHY_F which needs
  special handling (Jose)

Cc: Jani Nikula <jani.nikula at intel.com>
Cc: Matt Roper <matthew.d.roper at intel.com>
Cc: José Roberto de Souza <jose.souza at intel.com>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy at intel.com>
---
 drivers/gpu/drm/i915/display/intel_hotplug.c | 37 ++++++++------------
 1 file changed, 15 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_hotplug.c b/drivers/gpu/drm/i915/display/intel_hotplug.c
index 042d98bae1ea..27e3033278a0 100644
--- a/drivers/gpu/drm/i915/display/intel_hotplug.c
+++ b/drivers/gpu/drm/i915/display/intel_hotplug.c
@@ -89,29 +89,22 @@
 enum hpd_pin intel_hpd_pin_default(struct drm_i915_private *dev_priv,
 				   enum port port)
 {
-	switch (port) {
-	case PORT_A:
-		return HPD_PORT_A;
-	case PORT_B:
-		return HPD_PORT_B;
-	case PORT_C:
-		return HPD_PORT_C;
-	case PORT_D:
-		return HPD_PORT_D;
-	case PORT_E:
-		return HPD_PORT_E;
-	case PORT_F:
-		if (IS_CNL_WITH_PORT_F(dev_priv))
-			return HPD_PORT_E;
-		return HPD_PORT_F;
-	case PORT_G:
-		return HPD_PORT_G;
-	case PORT_H:
-		return HPD_PORT_H;
-	case PORT_I:
-		return HPD_PORT_I;
+	enum phy phy = intel_port_to_phy(dev_priv, port);
+
+	switch (phy) {
+	case PHY_F:
+		return IS_CNL_WITH_PORT_F(dev_priv) ? HPD_PORT_E : HPD_PORT_F;
+	case PHY_A:
+	case PHY_B:
+	case PHY_C:
+	case PHY_D:
+	case PHY_E:
+	case PHY_G:
+	case PHY_H:
+	case PHY_I:
+		return HPD_PORT_A + phy;
 	default:
-		MISSING_CASE(port);
+		MISSING_CASE(phy);
 		return HPD_NONE;
 	}
 }
-- 
2.21.1