DisplayLink 5.2.14 dkms for Linux 5.4.x patch

DisplayLink-5.2.14-Linux-5.4.patch

diff --git a/Makefile b/Makefile
index 8281112..5ed3acc 100644
--- a/Makefile
+++ b/Makefile
@@ -40,7 +40,7 @@ evdi-y := evdi_drv.o evdi_modeset.o evdi_connector.o evdi_encoder.o evdi_main.o
 evdi-$(CONFIG_COMPAT) += evdi_ioc32.o
 obj-$(CONFIG_DRM_EVDI) := evdi.o
 
-else
+endif
 
 # kbuild against specified or current kernel
 ifeq ($(KVER),)
@@ -51,7 +51,7 @@ ifeq ($(KDIR),)
 	KDIR := /lib/modules/$(KVER)/build
 endif
 
-default: module
+all: module
 
 module:
 	$(MAKE) -C $(KDIR) M=$$PWD
@@ -59,7 +59,4 @@ module:
 clean:
 	rm -rf *.o *.ko .tmp* .*.*.cmd Module.symvers evdi.mod.c modules.order
 
-
-endif # ifneq ($(KERNELRELEASE),)
-
 endif # ifneq ($(DKMS_BUILD),)
diff --git a/dkms.conf b/dkms.conf
index 817231d..ebd568e 100644
--- a/dkms.conf
+++ b/dkms.conf
@@ -7,11 +7,13 @@
 #
 
 PACKAGE_NAME="evdi"
-PACKAGE_VERSION=1.0.0
+PACKAGE_VERSION=5.2.14
 AUTOINSTALL=yes
 
-MAKE[0]="make all INCLUDEDIR=/lib/modules/$kernelver/build/include KVERSION=$kernelver DKMS_BUILD=1"
+#MAKE[0]="make all INCLUDEDIR=/lib/modules/$kernelver/build/include KVERSION=$kernelver DKMS_BUILD=1"
+MAKE[0]="make all INCLUDEDIR=/lib/modules/$kernelver/build/include KVER=$kernelver"
 DEST_MODULE_LOCATION[0]="/kernel/drivers/gpu/drm/evdi"
 BUILT_MODULE_NAME[0]="evdi"
-CLEAN="make clean KERNELRELEASE=$kernelver DKMS_BUILD=1"
+#CLEAN="make clean KERNELRELEASE=$kernelver DKMS_BUILD=1"
+CLEAN="make clean KERNELRELEASE=$kernelver"
 
diff --git a/evdi_drv.c b/evdi_drv.c
index e59d0a1..c4fd33e 100644
--- a/evdi_drv.c
+++ b/evdi_drv.c
@@ -18,6 +18,10 @@
 #include "evdi_params.h"
 #include "evdi_debug.h"
 
+#if KERNEL_VERSION(5, 4, 0) <= LINUX_VERSION_CODE
+# define DRIVER_PRIME 0
+#endif
+
 MODULE_AUTHOR("DisplayLink (UK) Ltd.");
 MODULE_DESCRIPTION("Extensible Virtual Display Interface");
 MODULE_LICENSE("GPL");
diff --git a/evdi_drv.h b/evdi_drv.h
index 0d67197..9433530 100644
--- a/evdi_drv.h
+++ b/evdi_drv.h
@@ -20,7 +20,17 @@
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_rect.h>
 #include <drm/drm_gem.h>
-#include <linux/reservation.h>
+#if KERNEL_VERSION(5, 4, 0) > LINUX_VERSION_CODE
+# include <linux/reservation.h>
+# define evdi_reservation_object reservation_object
+# define evdi_reservation_object_init reservation_object_init
+# define evdi_reservation_object_fini reservation_object_fini
+#else
+# include <linux/dma-resv.h>
+# define evdi_reservation_object dma_resv
+# define evdi_reservation_object_init dma_resv_init
+# define evdi_reservation_object_fini dma_resv_fini
+#endif
 #include "evdi_debug.h"
 
 #define DRIVER_NAME   "evdi"
@@ -51,8 +61,8 @@ struct evdi_gem_object {
 	struct page **pages;
 	void *vmapping;
 	struct sg_table *sg;
-	struct reservation_object *resv;
-	struct reservation_object _resv;
+	struct evdi_reservation_object *resv;
+	struct evdi_reservation_object _resv;
 };
 
 #define to_evdi_bo(x) container_of(x, struct evdi_gem_object, base)
@@ -112,8 +122,12 @@ uint32_t evdi_gem_object_handle_lookup(struct drm_file *filp,
 
 struct drm_gem_object *evdi_gem_prime_import(struct drm_device *dev,
 					     struct dma_buf *dma_buf);
+#if KERNEL_VERSION(5, 4, 0) > LINUX_VERSION_CODE
 struct dma_buf *evdi_gem_prime_export(struct drm_device *dev,
 				      struct drm_gem_object *obj, int flags);
+#else
+struct dma_buf *evdi_gem_prime_export(struct drm_gem_object *obj, int flags);
+#endif
 
 int evdi_gem_vmap(struct evdi_gem_object *obj);
 void evdi_gem_vunmap(struct evdi_gem_object *obj);
diff --git a/evdi_gem.c b/evdi_gem.c
index 2895d6c..0a0d336 100644
--- a/evdi_gem.c
+++ b/evdi_gem.c
@@ -61,7 +61,7 @@ struct evdi_gem_object *evdi_gem_alloc_object(struct drm_device *dev,
 		return NULL;
 	}
 
-	reservation_object_init(&obj->_resv);
+	evdi_reservation_object_init(&obj->_resv);
 	obj->resv = &obj->_resv;
 
 	return obj;
@@ -255,7 +255,7 @@ void evdi_gem_free_object(struct drm_gem_object *gem_obj)
 	if (gem_obj->dev->vma_offset_manager)
 		drm_gem_free_mmap_offset(gem_obj);
 
-	reservation_object_fini(&obj->_resv);
+	evdi_reservation_object_fini(&obj->_resv);
 	obj->resv = NULL;
 }
 
@@ -569,8 +569,12 @@ struct drm_gem_object *evdi_gem_prime_import(struct drm_device *dev,
 	return ERR_PTR(ret);
 }
 
+#if KERNEL_VERSION(5, 4, 0) > LINUX_VERSION_CODE
 struct dma_buf *evdi_gem_prime_export(__maybe_unused struct drm_device *dev,
 				      struct drm_gem_object *obj, int flags)
+#else
+struct dma_buf *evdi_gem_prime_export(struct drm_gem_object *obj, int flags)
+#endif
 {
 	struct evdi_gem_object *evdi_obj = to_evdi_bo(obj);
 	struct dma_buf_export_info exp_info = {
@@ -582,7 +586,7 @@ struct dma_buf *evdi_gem_prime_export(__maybe_unused struct drm_device *dev,
 		.priv = obj
 	};
 
-#if KERNEL_VERSION(4, 9, 0) <= LINUX_VERSION_CODE
+#if (KERNEL_VERSION(4, 9, 0) <= LINUX_VERSION_CODE) && (KERNEL_VERSION(5, 4, 0) > LINUX_VERSION_CODE)
 	return drm_gem_dmabuf_export(dev, &exp_info);
 #else
 	return dma_buf_export(&exp_info);

Thanks for your patch! Unfortunately, on latest Ubuntu 20.04LTS, trying to patch evdi, I got these errors:

patching file Makefile
Hunk #1 succeeded at 40 with fuzz 1.
Hunk #2 succeeded at 61 with fuzz 2 (offset 10 lines).
Hunk #3 FAILED at 59.
1 out of 3 hunks FAILED -- saving rejects to file Makefile.rej
patching file dkms.conf
patching file evdi_drv.c
Hunk #1 succeeded at 22 (offset 4 lines).
patching file evdi_drv.h
Hunk #1 FAILED at 20.
Hunk #2 FAILED at 51.
Hunk #3 FAILED at 112.
3 out of 3 hunks FAILED -- saving rejects to file evdi_drv.h.rej
patching file evdi_gem.c
Hunk #1 FAILED at 61.
Hunk #2 FAILED at 255.
Hunk #3 FAILED at 569.
Hunk #4 FAILED at 582.
4 out of 4 hunks FAILED -- saving rejects to file evdi_gem.c.rej

@kalon33 Sorry for a late response. Probably, DisplayLink updated the code in their destributed Linux driver, making this patch outdated. You can use code from DisplayLink/evdi in Ubuntu 20.04. I wrote this patch before discovering the repository, wouldn't have bothered otherwise 😉