drm/i915: Preserve the DDI link reversal configuration

Similarly to:

commit 6a0d1df3d3a0d2370541164eb0595fe35dcd6de3
Author: Damien Lespiau <[e-mail]>
Date: Tue Dec 11 15:18:28 2012 +0000

drm/i915: Preserve the FDI line reversal override bit on CPT

DDI port support lane reversal to easy the PCB layouting work. Let's
preserve the bit configured by the BIOS (until we find how to correctly
retrieve the information from the VBT, but this does sound more fragile
then just relying on the BIOS that has, hopefully, been validated
already.

Signed-off-by: Damien Lespiau <[e-mail]>
Reviewed-by: Paulo Zanoni <[e-mail]>
Cc: [e-mail]
Signed-off-by: Daniel Vetter <[e-mail]>

drivers/gpu/drm/i915/i915_reg.h

···
 #define  DDI_BUF_EMP_800MV_0DB_HSW		(7<<24)   /* Sel7 */
 #define  DDI_BUF_EMP_800MV_3_5DB_HSW		(8<<24)   /* Sel8 */
 #define  DDI_BUF_EMP_MASK			(0xf<<24)
+#define  DDI_BUF_PORT_REVERSAL			(1<<16)
 #define  DDI_BUF_IS_IDLE			(1<<7)
 #define  DDI_A_4_LANES				(1<<4)
 #define  DDI_PORT_WIDTH_X1			(0<<1)

drivers/gpu/drm/i915/intel_ddi.c

···
 					DP_TP_CTL_LINK_TRAIN_PAT1 |
 					DP_TP_CTL_ENABLE);
 
-		/* Configure and enable DDI_BUF_CTL for DDI E with next voltage */
+		/* Configure and enable DDI_BUF_CTL for DDI E with next voltage.
+		 * DDI E does not support port reversal, the functionality is
+		 * achieved on the PCH side in FDI_RX_CTL, so no need to set the
+		 * port reversal bit */
 		I915_WRITE(DDI_BUF_CTL(PORT_E),
 			   DDI_BUF_CTL_ENABLE |
 			   ((intel_crtc->fdi_lanes - 1) << 1) |
···
 	intel_crtc->eld_vld = false;
 	if (type == INTEL_OUTPUT_DISPLAYPORT || type == INTEL_OUTPUT_EDP) {
 		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+		struct intel_digital_port *intel_dig_port =
+			enc_to_dig_port(encoder);
 
-		intel_dp->DP = DDI_BUF_CTL_ENABLE | DDI_BUF_EMP_400MV_0DB_HSW;
+		intel_dp->DP = intel_dig_port->port_reversal |
+			       DDI_BUF_CTL_ENABLE | DDI_BUF_EMP_400MV_0DB_HSW;
 		switch (intel_dp->lane_count) {
 		case 1:
 			intel_dp->DP |= DDI_PORT_WIDTH_X1;
···
 	uint32_t tmp;
 
 	if (type == INTEL_OUTPUT_HDMI) {
+		struct intel_digital_port *intel_dig_port =
+			enc_to_dig_port(encoder);
+
 		/* In HDMI/DVI mode, the port width, and swing/emphasis values
 		 * are ignored so nothing special needs to be done besides
 		 * enabling the port.
 		 */
-		I915_WRITE(DDI_BUF_CTL(port), DDI_BUF_CTL_ENABLE);
+		I915_WRITE(DDI_BUF_CTL(port),
+			   intel_dig_port->port_reversal | DDI_BUF_CTL_ENABLE);
 	} else if (type == INTEL_OUTPUT_EDP) {
 		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
 
···
 
 void intel_ddi_init(struct drm_device *dev, enum port port)
 {
+	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_digital_port *intel_dig_port;
 	struct intel_encoder *intel_encoder;
 	struct drm_encoder *encoder;
···
 	intel_encoder->get_hw_state = intel_ddi_get_hw_state;
 
 	intel_dig_port->port = port;
+	intel_dig_port->port_reversal = I915_READ(DDI_BUF_CTL(port)) &
+					DDI_BUF_PORT_REVERSAL;
 	if (hdmi_connector)
 		intel_dig_port->hdmi.sdvox_reg = DDI_BUF_CTL(port);
 	else

drivers/gpu/drm/i915/intel_drv.h

···
 struct intel_digital_port {
 	struct intel_encoder base;
 	enum port port;
+	u32 port_reversal;
 	struct intel_dp dp;
 	struct intel_hdmi hdmi;
 };