1 files changed, 61 insertions, 0 deletions
diff --git a/debian/patches-rt/0251-drm-radeon-i915-Use-preempt_disable-enable_rt-where-.patch b/debian/patches-rt/0251-drm-radeon-i915-Use-preempt_disable-enable_rt-where-.patch
new file mode 100644
index 000000000..898eacd8a
--- /dev/null
+++ b/debian/patches-rt/0251-drm-radeon-i915-Use-preempt_disable-enable_rt-where-.patch
@@ -0,0 +1,61 @@
+From f85948d1377d8e7d97d94d7d90250791825fc355 Mon Sep 17 00:00:00 2001
+From: Mike Galbraith <umgwanakikbuti@gmail.com>
+Date: Sat, 27 Feb 2016 08:09:11 +0100
+Subject: [PATCH 251/347] drm,radeon,i915: Use preempt_disable/enable_rt()
+ where recommended
+Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz
+
+DRM folks identified the spots, so use them.
+
+Signed-off-by: Mike Galbraith <umgwanakikbuti@gmail.com>
+Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+Cc: linux-rt-users <linux-rt-users@vger.kernel.org>
+Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+---
+ drivers/gpu/drm/i915/i915_irq.c         | 2 ++
+ drivers/gpu/drm/radeon/radeon_display.c | 2 ++
+ 2 files changed, 4 insertions(+)
+
+diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
+index b7c398232136..eed1ba3009c6 100644
+--- a/drivers/gpu/drm/i915/i915_irq.c
++++ b/drivers/gpu/drm/i915/i915_irq.c
+@@ -1025,6 +1025,7 @@ static bool i915_get_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
+ 	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
+ 
+ 	/* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */
++	preempt_disable_rt();
+ 
+ 	/* Get optional system timestamp before query. */
+ 	if (stime)
+@@ -1076,6 +1077,7 @@ static bool i915_get_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
+ 		*etime = ktime_get();
+ 
+ 	/* preempt_enable_rt() should go right here in PREEMPT_RT patchset. */
++	preempt_enable_rt();
+ 
+ 	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
+ 
+diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
+index 5985efc5a1f3..de2552a40d36 100644
+--- a/drivers/gpu/drm/radeon/radeon_display.c
++++ b/drivers/gpu/drm/radeon/radeon_display.c
+@@ -1818,6 +1818,7 @@ int radeon_get_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
+ 	struct radeon_device *rdev = dev->dev_private;
+ 
+ 	/* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */
++	preempt_disable_rt();
+ 
+ 	/* Get optional system timestamp before query. */
+ 	if (stime)
+@@ -1910,6 +1911,7 @@ int radeon_get_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
+ 		*etime = ktime_get();
+ 
+ 	/* preempt_enable_rt() should go right here in PREEMPT_RT patchset. */
++	preempt_enable_rt();
+ 
+ 	/* Decode into vertical and horizontal scanout position. */
+ 	*vpos = position & 0x1fff;
+-- 
+2.36.1
+