From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Thu, 24 May 2018 22:04:06 +0300
Subject: drm/i915: Simplify ilk-ivb underrun suppression
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Git-commit: 2b5b63126ef4037a576bc8f9954629dc22274ad2
Patch-mainline: v4.19-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Let's suppress the underruns around every modeset sequence instead
of trying to avoid it. Planes are disabled at this point anyway so
we don't really gain anything from keeping the underrun reporting
enabled. Also for PCH ports we already suppress all underruns here
anyway so trying avoid it for the CPU eDP doesn't seem all that
important.

Maybe this gets rid of some lingering spurious underruns?

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180524190406.2973-2-ville.syrjala@linux.intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/i915/intel_display.c |   12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5465,10 +5465,8 @@ static void ironlake_crtc_enable(struct
 	 *
 	 * Spurious PCH underruns also occur during PCH enabling.
 	 */
-	if (intel_crtc->config->has_pch_encoder || IS_GEN5(dev_priv))
-		intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);
-	if (intel_crtc->config->has_pch_encoder)
-		intel_set_pch_fifo_underrun_reporting(dev_priv, pipe, false);
+	intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);
+	intel_set_pch_fifo_underrun_reporting(dev_priv, pipe, false);
 
 	if (intel_crtc->config->has_pch_encoder)
 		intel_prepare_shared_dpll(intel_crtc);
@@ -5712,10 +5710,8 @@ static void ironlake_crtc_disable(struct
 	 * pipe is already disabled, but FDI RX/TX is still enabled.
 	 * Happens at least with VGA+HDMI cloning. Suppress them.
 	 */
-	if (intel_crtc->config->has_pch_encoder) {
-		intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);
-		intel_set_pch_fifo_underrun_reporting(dev_priv, pipe, false);
-	}
+	intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);
+	intel_set_pch_fifo_underrun_reporting(dev_priv, pipe, false);
 
 	intel_encoders_disable(crtc, old_crtc_state, old_state);