[Intel-gfx] [PATCH 16/24] drm/i915: support DDI training in FDI mode
Eugeni Dodonov
eugeni.dodonov at intel.com
Thu Apr 26 20:21:11 CEST 2012
Starting with Haswell, DDI ports can work in FDI mode to support
connectivity with the outputs located on the PCH.
This commit adds support for such connections in the intel_ddi module, and
provides Haswell-specific functionality to make it work.
Signed-off-by: Eugeni Dodonov <eugeni.dodonov at intel.com>
---
drivers/gpu/drm/i915/intel_ddi.c | 121 ++++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_display.c | 3 +
drivers/gpu/drm/i915/intel_drv.h | 1 +
drivers/gpu/drm/i915/intel_pm.c | 10 +++
4 files changed, 135 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 32594a8..93436caa 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -109,3 +109,124 @@ void intel_prepare_ddi(struct drm_device *dev)
intel_prepare_ddi_buffers(dev, PORT_E, true);
}
}
+
+static const long hsw_ddi_buf_ctl_values[] = {
+ DDI_BUF_EMP_400MV_0DB_HSW,
+ DDI_BUF_EMP_400MV_3_5DB_HSW,
+ DDI_BUF_EMP_400MV_6DB_HSW,
+ DDI_BUF_EMP_400MV_9_5DB_HSW,
+ DDI_BUF_EMP_600MV_0DB_HSW,
+ DDI_BUF_EMP_600MV_3_5DB_HSW,
+ DDI_BUF_EMP_600MV_6DB_HSW,
+ DDI_BUF_EMP_800MV_0DB_HSW,
+ DDI_BUF_EMP_800MV_3_5DB_HSW
+};
+
+
+/* Link training for Haswell DDI port to work in FDI mode */
+static void hsw_fdi_link_train(struct drm_crtc *crtc)
+{
+ struct drm_device *dev = crtc->dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+ int pipe = intel_crtc->pipe;
+ u32 reg, temp, i;
+
+ /* Configure CPU PLL, wait for warmup */
+ I915_WRITE(SPLL_CTL,
+ SPLL_PLL_ENABLE |
+ SPLL_PLL_FREQ_1350MHz |
+ SPLL_PLL_SCC);
+
+ /* Use SPLL to drive the output when in FDI mode */
+ I915_WRITE(PORT_CLK_SEL(PORT_E),
+ PORT_CLK_SEL_SPLL);
+ I915_WRITE(PIPE_CLK_SEL(pipe),
+ PIPE_CLK_SEL_PORT(PORT_E));
+
+ udelay(20);
+
+ /* Start the training iterating through available voltages and emphasis */
+ for (i=0; i < ARRAY_SIZE(hsw_ddi_buf_ctl_values); i++) {
+ /* Configure DP_TP_CTL with auto-training */
+ I915_WRITE(DP_TP_CTL(PORT_E),
+ DP_TP_CTL_FDI_AUTOTRAIN |
+ DP_TP_CTL_ENHANCED_FRAME_ENABLE |
+ DP_TP_CTL_LINK_TRAIN_PAT1 |
+ DP_TP_CTL_ENABLE);
+
+ /* Configure and enable DDI_BUF_CTL for DDI E with next voltage */
+ temp = I915_READ(DDI_BUF_CTL(PORT_E));
+ temp = (temp & ~DDI_BUF_EMP_MASK);
+ I915_WRITE(DDI_BUF_CTL(PORT_E),
+ temp |
+ DDI_BUF_CTL_ENABLE |
+ DDI_PORT_WIDTH_X2 |
+ hsw_ddi_buf_ctl_values[i]);
+
+ udelay(600);
+
+ /* Enable CPU FDI Receiver with auto-training */
+ reg = FDI_RX_CTL(pipe);
+ I915_WRITE(reg,
+ I915_READ(reg) |
+ FDI_LINK_TRAIN_AUTO |
+ FDI_RX_ENABLE |
+ FDI_LINK_TRAIN_PATTERN_1_CPT |
+ FDI_RX_ENHANCE_FRAME_ENABLE |
+ FDI_PORT_WIDTH_2X_LPT |
+ FDI_RX_PLL_ENABLE);
+ POSTING_READ(reg);
+ udelay(100);
+
+ temp = I915_READ(DP_TP_STATUS(PORT_E));
+ if (temp & DP_TP_STATUS_AUTOTRAIN_DONE) {
+ DRM_DEBUG_DRIVER("BUF_CTL training done on %d step\n", i);
+
+ /* Enable normal pixel sending for FDI */
+ I915_WRITE(DP_TP_CTL(PORT_E),
+ DP_TP_CTL_FDI_AUTOTRAIN |
+ DP_TP_CTL_LINK_TRAIN_NORMAL |
+ DP_TP_CTL_ENHANCED_FRAME_ENABLE |
+ DP_TP_CTL_ENABLE);
+
+ /* Enable PIPE_DDI_FUNC_CTL for the pipe to work in FDI mode */
+ temp = I915_READ(DDI_FUNC_CTL(pipe));
+ temp &= ~PIPE_DDI_PORT_MASK;
+ temp |= PIPE_DDI_SELECT_PORT(PORT_E) |
+ PIPE_DDI_MODE_SELECT_FDI |
+ PIPE_DDI_FUNC_ENABLE |
+ PIPE_DDI_PORT_WIDTH_X2;
+ I915_WRITE(DDI_FUNC_CTL(pipe),
+ temp);
+ break;
+ } else {
+ DRM_ERROR("Error training BUF_CTL %d\n", i);
+
+ /* Disable DP_TP_CTL and FDI_RX_CTL) and retry */
+ I915_WRITE(DP_TP_CTL(PORT_E),
+ I915_READ(DP_TP_CTL(PORT_E)) &
+ ~DP_TP_CTL_ENABLE);
+ I915_WRITE(FDI_RX_CTL(pipe),
+ I915_READ(FDI_RX_CTL(pipe)) &
+ ~FDI_RX_PLL_ENABLE);
+ continue;
+ }
+ }
+
+ DRM_DEBUG_KMS("FDI train done.\n");
+}
+
+/* Starting with Haswell, different DDI ports can work in FDI mode for
+ * connection to the PCH-located connectors.
+ *
+ * To avoid exporting generation-specific functions, we abstract the DDI port
+ * training in FDI mode here.
+ */
+void ddi_fdi_link_train(struct drm_crtc *crtc)
+{
+ struct drm_device *dev = crtc->dev;
+
+ if (IS_HASWELL(dev))
+ hsw_fdi_link_train(crtc);
+}
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index ad080b7..5be2ff1 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6617,6 +6617,9 @@ static void intel_init_display(struct drm_device *dev)
/* FIXME: detect B0+ stepping and use auto training */
dev_priv->display.fdi_link_train = ivb_manual_fdi_link_train;
dev_priv->display.write_eld = ironlake_write_eld;
+ } else if (IS_HASWELL(dev)) {
+ dev_priv->display.fdi_link_train = ddi_fdi_link_train;
+ dev_priv->display.write_eld = ironlake_write_eld;
} else
dev_priv->display.update_wm = NULL;
} else if (IS_VALLEYVIEW(dev)) {
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 8e93d2e..df3536f 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -443,6 +443,7 @@ extern void intel_write_eld(struct drm_encoder *encoder,
struct drm_display_mode *mode);
extern void intel_cpt_verify_modeset(struct drm_device *dev, int pipe);
extern void intel_prepare_ddi(struct drm_device *dev);
+extern void ddi_fdi_link_train(struct drm_crtc *crtc);
/* For use by IVB LP watermark workaround in intel_sprite.c */
extern void intel_update_watermarks(struct drm_device *dev);
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index f87768d..2b437c9 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3055,6 +3055,16 @@ void intel_init_pm(struct drm_device *dev)
dev_priv->display.update_wm = NULL;
}
dev_priv->display.init_clock_gating = ivybridge_init_clock_gating;
+ } else if (IS_HASWELL(dev)) {
+ if (SNB_READ_WM0_LATENCY()) {
+ dev_priv->display.update_wm = sandybridge_update_wm;
+ dev_priv->display.update_sprite_wm = sandybridge_update_sprite_wm;
+ } else {
+ DRM_DEBUG_KMS("Failed to read display plane latency. "
+ "Disable CxSR\n");
+ dev_priv->display.update_wm = NULL;
+ }
+ dev_priv->display.init_clock_gating = ivybridge_init_clock_gating;
} else
dev_priv->display.update_wm = NULL;
} else if (IS_VALLEYVIEW(dev)) {
--
1.7.10
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