And another skylake laptop external monitor fix
which would be good to add to the Fedora kernels.
(note it has a Cc stable)
-------- Forwarded Message --------
Subject: [PATCH] drm/i915/skl: Fix redundant cursor update, fix cursor underruns
Date: Fri, 15 Jul 2016 18:13:56 -0400
From: Lyude <cpaul(a)redhat.com>
To: intel-gfx(a)lists.freedesktop.org
CC: Lyude <cpaul(a)redhat.com>, Radhakrishna Sripada <radhakrishna.sripada(a)intel.com>, Hans de Goede <hdegoede(a)redhat.com>, stable(a)vger.kernel.org, Daniel Vetter <daniel.vetter(a)intel.com>, Jani Nikula <jani.nikula(a)linux.intel.com>, David Airlie <airlied(a)linux.ie>, open list:INTEL DRM DRIVERS (excluding Poulsbo, Moorestow...), linux-kernel(a)vger.kernel.org (open list) <dri-devel(a)lists.freedesktop.org>
At long last, the time has finally come for Skylake users to plug their
external displays back in.
During intel_atomic_commit() on Skylake, we've actually been arming the
registers to update the cursor information twice instead of just once.
Once in i9xx_update_cursor(), and once in skl_wm_flush_pipe(). This
isn't actually necessary, and removing the later update in
skl_wm_flush_pipe() has completely stopped the underruns on this T460p
from occurring when moving the mouse cursor from one monitor to another.
Signed-off-by: Lyude <cpaul(a)redhat.com>
Cc: Radhakrishna Sripada <radhakrishna.sripada(a)intel.com>
Cc: Hans de Goede <hdegoede(a)redhat.com>
Cc: stable(a)vger.kernel.org
---
drivers/gpu/drm/i915/intel_pm.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 7ac71ec..4771a03 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3860,7 +3860,6 @@ skl_wm_flush_pipe(struct drm_i915_private *dev_priv, enum pipe pipe, int pass)
I915_WRITE(PLANE_SURF(pipe, plane),
I915_READ(PLANE_SURF(pipe, plane)));
}
- I915_WRITE(CURBASE(pipe), I915_READ(CURBASE(pipe)));
}
static bool
--
2.7.4