1 files changed, 79 insertions, 0 deletions
diff --git a/bsp/meta-synopsys/recipes-kernel/linux/linux-arc/0009-UDL-add-pseudo-deferred-io-for-modeset-drive.patch b/bsp/meta-synopsys/recipes-kernel/linux/linux-arc/0009-UDL-add-pseudo-deferred-io-for-modeset-drive.patch
new file mode 100644
index 00000000..9ca4f1eb
--- /dev/null
+++ b/bsp/meta-synopsys/recipes-kernel/linux/linux-arc/0009-UDL-add-pseudo-deferred-io-for-modeset-drive.patch
@@ -0,0 +1,79 @@
+From dba8746636e35f3e42bed62f5b7d7231adf569c8 Mon Sep 17 00:00:00 2001
+From: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
+Date: Wed, 4 Apr 2018 21:55:21 +0300
+Subject: [PATCH v100500 9/9] UDL: add pseudo deferred io for modeset driver
+
+With blackjack and mud.
+---
+ drivers/gpu/drm/udl/udl_modeset.c | 42 +++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 42 insertions(+)
+
+diff --git a/drivers/gpu/drm/udl/udl_modeset.c b/drivers/gpu/drm/udl/udl_modeset.c
+index 5bcae7649795..737471da16e4 100644
+--- a/drivers/gpu/drm/udl/udl_modeset.c
++++ b/drivers/gpu/drm/udl/udl_modeset.c
+@@ -17,6 +17,45 @@
+ #include <drm/drm_plane_helper.h>
+ #include "udl_drv.h"
+ 
++/* All hacks and mud stuff --- start */
++#define DL_DEFIO_WRITE_DELAY    (HZ / 40) /* deferred_io delay in jiffies */
++
++static struct delayed_work deferred_work;
++static struct drm_device *deferred_dev;
++
++static void pal_modeset_damage(struct drm_device *dev)
++{
++	struct udl_device *udl = dev->dev_private;
++	struct udl_framebuffer *ufb;
++
++	if (!udl->crtc || !udl->crtc->primary->fb)
++		return;
++
++	ufb = to_udl_fb(udl->crtc->primary->fb);
++	udl_handle_damage(ufb, 0, 0, ufb->base.width, ufb->base.height);
++}
++
++static void pal_deferred_io_work(struct work_struct *work)
++{
++	pal_modeset_damage(deferred_dev);
++	schedule_delayed_work(&deferred_work, DL_DEFIO_WRITE_DELAY);
++}
++
++static void pal_deferred_io_cleanup(void)
++{
++	cancel_delayed_work_sync(&deferred_work);
++}
++
++static void pal_deferred_io_init(struct drm_device *dev)
++{
++	deferred_dev = dev;
++
++	INIT_DELAYED_WORK(&deferred_work, pal_deferred_io_work);
++
++	schedule_delayed_work(&deferred_work, DL_DEFIO_WRITE_DELAY);
++}
++/* All hacks and mud stuff --- end */
++
+ /*
+  * All DisplayLink bulk operations start with 0xAF, followed by specific code
+  * All operations are written to buffers which then later get sent to device
+@@ -450,6 +489,8 @@ int udl_modeset_init(struct drm_device *dev)
+ 
+ 	udl_connector_init(dev, encoder);
+ 
++	pal_deferred_io_init(dev);
++
+ 	return 0;
+ }
+ 
+@@ -467,5 +508,6 @@ void udl_modeset_restore(struct drm_device *dev)
+ 
+ void udl_modeset_cleanup(struct drm_device *dev)
+ {
++	pal_deferred_io_cleanup();
+ 	drm_mode_config_cleanup(dev);
+ }
+-- 
+2.14.3
+