[Intel-gfx] [PATCH v2 08/14] drm/i915: Disable FIFO underrun reporting around IBX transcoder B workaround

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Doing the IBX transcoder B workaround causes underruns on
pipe/transcoder A. Just hide them by disabling underrun reporting for
pipe A around the workaround.

It might be possible to avoid the underruns by moving the workaround
to be applied only when enabling pipe A. But I was too lazy to try it
right now, and the current method has been proven to work, so didn't
want to change it too hastily.

Note that this can re-enable underrun reporting on pipe A if was
already disabled due to a previous actual underrun. But that's OK, we
may just get a second underrun report if another real underron occurrs
on pipe A.

v2: Note that pipe A underruns can get re-enabled due to this (Jani)

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Reviewed-by: Jesse Barnes <jbarnes at virtuousgeek.org> (v1)
---
 drivers/gpu/drm/i915/intel_dp.c   | 11 +++++++++++
 drivers/gpu/drm/i915/intel_drv.h  |  9 +++++++++
 drivers/gpu/drm/i915/intel_hdmi.c | 11 +++++++++++
 drivers/gpu/drm/i915/intel_sdvo.c | 11 +++++++++++
 4 files changed, 42 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 1cb1f3f..3ad3405 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3957,6 +3957,13 @@ intel_dp_link_down(struct intel_dp *intel_dp)
 	 * matching HDMI port to be enabled on transcoder A.
 	 */
 	if (HAS_PCH_IBX(dev) && crtc->pipe == PIPE_B && port != PORT_A) {
+		/*
+		 * We get CPU/PCH FIFO underruns on the other pipe when
+		 * doing the workaround. Sweep them under the rug.
+		 */
+		intel_set_cpu_fifo_underrun_reporting(dev_priv, PIPE_A, false);
+		intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, false);
+
 		/* always enable with pattern 1 (as per spec) */
 		DP &= ~(DP_PIPEB_SELECT | DP_LINK_TRAIN_MASK);
 		DP |= DP_PORT_EN | DP_LINK_TRAIN_PAT_1;
@@ -3966,6 +3973,10 @@ intel_dp_link_down(struct intel_dp *intel_dp)
 		DP &= ~DP_PORT_EN;
 		I915_WRITE(intel_dp->output_reg, DP);
 		POSTING_READ(intel_dp->output_reg);
+
+		intel_wait_for_vblank_if_active(dev_priv->dev, PIPE_A);
+		intel_set_cpu_fifo_underrun_reporting(dev_priv, PIPE_A, true);
+		intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, true);
 	}
 
 	msleep(intel_dp->panel_power_down_delay);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 72cc272..35f1457 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1073,6 +1073,15 @@ intel_wait_for_vblank(struct drm_device *dev, int pipe)
 {
 	drm_wait_one_vblank(dev, pipe);
 }
+static inline void
+intel_wait_for_vblank_if_active(struct drm_device *dev, int pipe)
+{
+	const struct intel_crtc *crtc =
+		to_intel_crtc(intel_get_crtc_for_pipe(dev, pipe));
+
+	if (crtc->active)
+		intel_wait_for_vblank(dev, pipe);
+}
 int ironlake_get_lanes_required(int target_clock, int link_bw, int bpp);
 void vlv_wait_port_ready(struct drm_i915_private *dev_priv,
 			 struct intel_digital_port *dport,
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 013bd7d..bccbe70 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1108,6 +1108,13 @@ static void intel_disable_hdmi(struct intel_encoder *encoder)
 	 * matching DP port to be enabled on transcoder A.
 	 */
 	if (HAS_PCH_IBX(dev) && crtc->pipe == PIPE_B) {
+		/*
+		 * We get CPU/PCH FIFO underruns on the other pipe when
+		 * doing the workaround. Sweep them under the rug.
+		 */
+		intel_set_cpu_fifo_underrun_reporting(dev_priv, PIPE_A, false);
+		intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, false);
+
 		temp &= ~SDVO_PIPE_B_SELECT;
 		temp |= SDVO_ENABLE;
 		/*
@@ -1122,6 +1129,10 @@ static void intel_disable_hdmi(struct intel_encoder *encoder)
 		temp &= ~SDVO_ENABLE;
 		I915_WRITE(intel_hdmi->hdmi_reg, temp);
 		POSTING_READ(intel_hdmi->hdmi_reg);
+
+		intel_wait_for_vblank_if_active(dev_priv->dev, PIPE_A);
+		intel_set_cpu_fifo_underrun_reporting(dev_priv, PIPE_A, true);
+		intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, true);
 	}
 
 	intel_hdmi->set_infoframes(&encoder->base, false, NULL);
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index c42b636..267e6cb 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -1464,12 +1464,23 @@ static void intel_disable_sdvo(struct intel_encoder *encoder)
 	 * matching DP port to be enabled on transcoder A.
 	 */
 	if (HAS_PCH_IBX(dev_priv) && crtc->pipe == PIPE_B) {
+		/*
+		 * We get CPU/PCH FIFO underruns on the other pipe when
+		 * doing the workaround. Sweep them under the rug.
+		 */
+		intel_set_cpu_fifo_underrun_reporting(dev_priv, PIPE_A, false);
+		intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, false);
+
 		temp &= ~SDVO_PIPE_B_SELECT;
 		temp |= SDVO_ENABLE;
 		intel_sdvo_write_sdvox(intel_sdvo, temp);
 
 		temp &= ~SDVO_ENABLE;
 		intel_sdvo_write_sdvox(intel_sdvo, temp);
+
+		intel_wait_for_vblank_if_active(dev_priv->dev, PIPE_A);
+		intel_set_cpu_fifo_underrun_reporting(dev_priv, PIPE_A, true);
+		intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, true);
 	}
 }
 
-- 
2.4.10