[Intel-gfx] [PATCH 01/19] drm/i915: define I915 during i915 driver build

[Jani Nikula]

The xe driver will reuse i915 display code by compiling it separately as
part of xe. We'll want to be able to distinguish between building the
i915 display code for i915 and xe. Define I915 when building i915.

Cc: David Airlie <airlied at gmail.com>
Cc: Daniel Vetter <daniel at ffwll.ch>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
Cc: Lucas De Marchi <lucas.demarchi at intel.com>
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/i915/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 1b2e02e9d92c..fa6aa71bb749 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -28,6 +28,10 @@ CFLAGS_i915_pci.o = $(call cc-disable-warning, override-init)
 CFLAGS_display/intel_display_device.o = $(call cc-disable-warning, override-init)
 CFLAGS_display/intel_fbdev.o = $(call cc-disable-warning, override-init)
 
+# Support compiling the display code separately for both i915 and xe
+# drivers. Define I915 when building i915.
+subdir-ccflags-y += -DI915
+
 subdir-ccflags-y += -I$(srctree)/$(src)
 
 # Please keep these build lists sorted!
-- 
2.39.2