From: Ville Syrjälä Date: Fri, 30 Oct 2015 17:23:22 +0000 (+0200) Subject: drm/i915: Disable FIFO underrun reporting around IBX transcoder B workaround X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0c241d5b2770d4a50d3367ed591d0d0236b69b51;p=linux-beck.git drm/i915: Disable FIFO underrun reporting around IBX transcoder B workaround 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 Reviewed-by: Jesse Barnes (v1) Link: http://patchwork.freedesktop.org/patch/msgid/1446225802-11180-1-git-send-email-ville.syrjala@linux.intel.com --- diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 5264887311f1..278f025f4b20 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -3655,6 +3655,13 @@ 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; @@ -3664,6 +3671,10 @@ 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 d45677436170..f32a59493a09 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -1079,6 +1079,15 @@ 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 013bd7d522ca..bccbe701649b 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 c42b636c2087..267e6cb76c4a 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); } }