[PATCH 12/25] drm/i915: account for only one PCH receiver on Haswell

[Eugeni Dodonov <eugeni.dodonov@intel.com>]

On Haswell, only one pipe can work in FDI mode, so this patch prevents
messing with wrong registers when FDI is being used by non-first pipe. And
to prevent this, we also specify that the VGA can only be used on pipe 0
for now in the crtc_mask value.

Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
---
 drivers/gpu/drm/i915/intel_crt.c     |    6 +++++-
 drivers/gpu/drm/i915/intel_display.c |   19 ++++++++++++++++---
 2 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 417ca99..75a70c4 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -615,7 +615,11 @@ void intel_crt_init(struct drm_device *dev)
 	crt->base.clone_mask = (1 << INTEL_SDVO_NON_TV_CLONE_BIT |
 				1 << INTEL_ANALOG_CLONE_BIT |
 				1 << INTEL_SDVO_LVDS_CLONE_BIT);
-	crt->base.crtc_mask = (1 << 0) | (1 << 1);
+	if (IS_HASWELL(dev))
+		crt->base.crtc_mask = (1 << 0);
+	else
+		crt->base.crtc_mask = (1 << 0) | (1 << 1);
+
 	if (IS_GEN2(dev))
 		connector->interlace_allowed = 0;
 	else
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 283b502..9b46619 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -977,9 +977,14 @@ static void assert_fdi_rx(struct drm_i915_private *dev_priv,
 	u32 val;
 	bool cur_state;
 
-	reg = FDI_RX_CTL(pipe);
-	val = I915_READ(reg);
-	cur_state = !!(val & FDI_RX_ENABLE);
+	if (IS_HASWELL(dev_priv->dev) && pipe > 0) {
+			DRM_ERROR("Attempting to enable FDI_RX on Haswell pipe > 0\n");
+			return;
+	} else {
+		reg = FDI_RX_CTL(pipe);
+		val = I915_READ(reg);
+		cur_state = !!(val & FDI_RX_ENABLE);
+	}
 	WARN(cur_state != state,
 	     "FDI RX state assertion failure (expected %s, current %s)\n",
 	     state_string(state), state_string(cur_state));
@@ -1012,6 +1017,10 @@ static void assert_fdi_rx_pll_enabled(struct drm_i915_private *dev_priv,
 	int reg;
 	u32 val;
 
+	if (IS_HASWELL(dev_priv->dev) && pipe > 0) {
+		DRM_ERROR("Attempting to enable FDI on Haswell with pipe > 0\n");
+		return;
+	}
 	reg = FDI_RX_CTL(pipe);
 	val = I915_READ(reg);
 	WARN(!(val & FDI_RX_PLL_ENABLE), "FDI RX PLL assertion failure, should be active but is disabled\n");
@@ -1483,6 +1492,10 @@ static void intel_enable_transcoder(struct drm_i915_private *dev_priv,
 	assert_fdi_tx_enabled(dev_priv, pipe);
 	assert_fdi_rx_enabled(dev_priv, pipe);
 
+	if (IS_HASWELL(dev_priv->dev) && pipe > 0) {
+		DRM_ERROR("Attempting to enable transcoder on Haswell with pipe > 0\n");
+		return;
+	}
 	reg = TRANSCONF(pipe);
 	val = I915_READ(reg);
 	pipeconf_val = I915_READ(PIPECONF(pipe));
-- 
1.7.10