[Intel-gfx] [PATCH 6/6] drm/i915: Enable HDMI on DDI-E

[Xiong Zhang]

DDI-E doesn't have the correspondent GMBUS pin.

We rely on VBT to tell us which one it being used instead.

The DVI/HDMI on shared port couldn't exist.

This patch isn't tested without hardware wchich has HDMI
on DDI-E.

Signed-off-by: Xiong Zhang <xiong.y.zhang at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h   |  5 +++++
 drivers/gpu/drm/i915/intel_bios.c | 28 ++++++++++++++++++++++++----
 drivers/gpu/drm/i915/intel_hdmi.c | 18 ++++++++++++++++++
 3 files changed, 47 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 6d93334..5d8e7fe 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1414,6 +1414,10 @@ enum modeset_restore {
 #define DP_AUX_C 0x20
 #define DP_AUX_D 0x30
 
+#define DDC_PIN_B  0x05
+#define DDC_PIN_C  0x04
+#define DDC_PIN_D  0x06
+
 struct ddi_vbt_port_info {
 	/*
 	 * This is an index in the HDMI/DVI DDI buffer translation table.
@@ -1428,6 +1432,7 @@ struct ddi_vbt_port_info {
 	uint8_t supports_dp:1;
 
 	uint8_t alternate_aux_channel;
+	uint8_t alternate_ddc_pin;
 };
 
 enum psr_lines_to_wait {
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index 16cdf17..265227f 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -894,7 +894,7 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
 	uint8_t hdmi_level_shift;
 	int i, j;
 	bool is_dvi, is_hdmi, is_dp, is_edp, is_crt;
-	uint8_t aux_channel;
+	uint8_t aux_channel, ddc_pin;
 	/* Each DDI port can have more than one value on the "DVO Port" field,
 	 * so look for all the possible values for each port and abort if more
 	 * than one is found. */
@@ -928,6 +928,7 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
 		return;
 
 	aux_channel = child->raw[25];
+	ddc_pin = child->common.ddc_pin;
 
 	is_dvi = child->common.device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING;
 	is_dp = child->common.device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT;
@@ -959,11 +960,30 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
 		DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
 
 	if (is_dvi) {
-		if (child->common.ddc_pin == 0x05 && port != PORT_B)
+		if (port == PORT_E) {
+			info->alternate_ddc_pin = ddc_pin;
+			/* if DDIE share ddc pin with other port, then
+			 * dvi/hdmi couldn't exist on the shared port. 
+			 * Otherwise they share the same ddc bin and system
+			 * couldn't communicate with them seperately. */
+			if (ddc_pin == DDC_PIN_B) {
+				dev_priv->vbt.ddi_port_info[PORT_B].supports_dvi = 0;
+				dev_priv->vbt.ddi_port_info[PORT_B].supports_hdmi = 0;
+			}
+			else if (ddc_pin == DDC_PIN_C) {
+				dev_priv->vbt.ddi_port_info[PORT_C].supports_dvi = 0;
+				dev_priv->vbt.ddi_port_info[PORT_C].supports_hdmi = 0;
+			}	
+			else if (ddc_pin == DDC_PIN_D) {
+				dev_priv->vbt.ddi_port_info[PORT_D].supports_dvi = 0;
+				dev_priv->vbt.ddi_port_info[PORT_D].supports_hdmi = 0;
+			}
+		}
+		else if (ddc_pin == DDC_PIN_B && port != PORT_B)
 			DRM_DEBUG_KMS("Unexpected DDC pin for port B\n");
-		if (child->common.ddc_pin == 0x04 && port != PORT_C)
+		else if (ddc_pin == DDC_PIN_C && port != PORT_C)
 			DRM_DEBUG_KMS("Unexpected DDC pin for port C\n");
-		if (child->common.ddc_pin == 0x06 && port != PORT_D)
+		else if (ddc_pin == DDC_PIN_D && port != PORT_D)
 			DRM_DEBUG_KMS("Unexpected DDC pin for port D\n");
 	}
 
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 70bad5b..e1f6e81 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1991,6 +1991,24 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
 			intel_hdmi->ddc_bus = GMBUS_PIN_DPD;
 		intel_encoder->hpd_pin = HPD_PORT_D;
 		break;
+	case PORT_E:
+		/* On SKL PORT E doesn't have seperate GMBUS pin
+		 *  We rely on VBT to set a proper alternate GMBUS pin. */
+		switch (dev_priv->vbt.ddi_port_info[PORT_E].alternate_ddc_pin) {
+		case DDC_PIN_B:
+			intel_hdmi->ddc_bus = GMBUS_PIN_DPB;
+			break;
+		case DDC_PIN_C:
+			intel_hdmi->ddc_bus = GMBUS_PIN_DPC;
+			break;
+		case DDC_PIN_D:
+			intel_hdmi->ddc_bus = GMBUS_PIN_DPD;
+			break;
+		default:
+			BUG();
+		}
+		intel_encoder->hpd_pin = HPD_PORT_E;
+		break;
 	case PORT_A:
 		intel_encoder->hpd_pin = HPD_PORT_A;
 		/* Internal port only for eDP. */
-- 
2.1.4