drm/i915: fix CPU vs PCH eDP confusion

FDI training needs to done and idle for PCH eDP and before we turn the
pipes on, and various eDP checks need to account for PCH attached eDP.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/intel_display.c

@@ -932,10 +932,6 @@ intel_find_pll_ironlake_dp(const intel_limit_t *limit, struct drm_crtc *crtc,
 	struct drm_device *dev = crtc->dev;
 	intel_clock_t clock;
 
-	/* return directly when it is eDP */
-	if (HAS_eDP)
-		return true;
-
 	if (target < 200000) {
 		clock.n = 1;
 		clock.p1 = 2;
@@ -1763,6 +1759,28 @@ static void ironlake_fdi_link_train(struct drm_crtc *crtc)
 		DRM_ERROR("FDI train 2 fail!\n");
 
 	DRM_DEBUG_KMS("FDI train done\n");
+
+	/* enable normal train */
+	reg = FDI_TX_CTL(pipe);
+	temp = I915_READ(reg);
+	temp &= ~FDI_LINK_TRAIN_NONE;
+	temp |= FDI_LINK_TRAIN_NONE | FDI_TX_ENHANCE_FRAME_ENABLE;
+	I915_WRITE(reg, temp);
+
+	reg = FDI_RX_CTL(pipe);
+	temp = I915_READ(reg);
+	if (HAS_PCH_CPT(dev)) {
+		temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
+		temp |= FDI_LINK_TRAIN_NORMAL_CPT;
+	} else {
+		temp &= ~FDI_LINK_TRAIN_NONE;
+		temp |= FDI_LINK_TRAIN_NONE;
+	}
+	I915_WRITE(reg, temp | FDI_RX_ENHANCE_FRAME_ENABLE);
+
+	/* wait one idle pattern time */
+	POSTING_READ(reg);
+	udelay(1000);
 }
 
 static const int const snb_b_fdi_train_param [] = {
@@ -2065,28 +2083,6 @@ static void ironlake_crtc_enable(struct drm_crtc *crtc)
 	I915_WRITE(TRANS_VBLANK(pipe), I915_READ(VBLANK(pipe)));
 	I915_WRITE(TRANS_VSYNC(pipe),  I915_READ(VSYNC(pipe)));
 
-	/* enable normal train */
-	reg = FDI_TX_CTL(pipe);
-	temp = I915_READ(reg);
-	temp &= ~FDI_LINK_TRAIN_NONE;
-	temp |= FDI_LINK_TRAIN_NONE | FDI_TX_ENHANCE_FRAME_ENABLE;
-	I915_WRITE(reg, temp);
-
-	reg = FDI_RX_CTL(pipe);
-	temp = I915_READ(reg);
-	if (HAS_PCH_CPT(dev)) {
-		temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
-		temp |= FDI_LINK_TRAIN_NORMAL_CPT;
-	} else {
-		temp &= ~FDI_LINK_TRAIN_NONE;
-		temp |= FDI_LINK_TRAIN_NONE;
-	}
-	I915_WRITE(reg, temp | FDI_RX_ENHANCE_FRAME_ENABLE);
-
-	/* wait one idle pattern time */
-	POSTING_READ(reg);
-	udelay(100);
-
 	/* For PCH DP, enable TRANS_DP_CTL */
 	if (HAS_PCH_CPT(dev) &&
 	    intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT)) {
@@ -3683,16 +3679,16 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
 	/* FDI link */
 	if (HAS_PCH_SPLIT(dev)) {
 		int lane = 0, link_bw, bpp;
-		/* eDP doesn't require FDI link, so just set DP M/N
+		/* CPU eDP doesn't require FDI link, so just set DP M/N
 		   according to current link config */
-		if (has_edp_encoder) {
+		if (has_edp_encoder && !intel_encoder_is_pch_edp(&encoder->base)) {
 			target_clock = mode->clock;
 			intel_edp_link_config(has_edp_encoder,
 					      &lane, &link_bw);
 		} else {
-			/* DP over FDI requires target mode clock
+			/* [e]DP over FDI requires target mode clock
 			   instead of link clock */
-			if (is_dp)
+			if (is_dp || intel_encoder_is_pch_edp(&has_edp_encoder->base))
 				target_clock = mode->clock;
 			else
 				target_clock = adjusted_mode->clock;
@@ -3932,7 +3928,8 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
 		dpll_reg = DPLL(pipe);
 	}
 
-	if (!has_edp_encoder) {
+	/* PCH eDP needs FDI, but CPU eDP does not */
+	if (!has_edp_encoder || intel_encoder_is_pch_edp(&has_edp_encoder->base)) {
 		I915_WRITE(fp_reg, fp);
 		I915_WRITE(dpll_reg, dpll & ~DPLL_VCO_ENABLE);
 
@@ -4009,9 +4006,9 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
 		}
 	}
 
-	if (is_dp)
+	if (is_dp || intel_encoder_is_pch_edp(&has_edp_encoder->base)) {
 		intel_dp_set_m_n(crtc, mode, adjusted_mode);
-	else if (HAS_PCH_SPLIT(dev)) {
+	} else if (HAS_PCH_SPLIT(dev)) {
 		/* For non-DP output, clear any trans DP clock recovery setting.*/
 		if (pipe == 0) {
 			I915_WRITE(TRANSA_DATA_M1, 0);
@@ -4026,7 +4023,7 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
 		}
 	}
 
-	if (!has_edp_encoder) {
+	if (!has_edp_encoder || intel_encoder_is_pch_edp(&has_edp_encoder->base)) {
 		I915_WRITE(fp_reg, fp);
 		I915_WRITE(dpll_reg, dpll);
 
@@ -4120,7 +4117,7 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
 		I915_WRITE(PIPE_LINK_M1(pipe), m_n.link_m);
 		I915_WRITE(PIPE_LINK_N1(pipe), m_n.link_n);
 
-		if (has_edp_encoder) {
+		if (has_edp_encoder && !intel_encoder_is_pch_edp(&has_edp_encoder->base)) {
 			ironlake_set_pll_edp(crtc, adjusted_mode->clock);
 		} else {
 			/* enable FDI RX PLL too */