[PATCH v2 4/9] drm/i915/display: add display platforms structure with platform members

[Jani Nikula <jani.nikula@xxxxxxxxx>]

Add a structure with a bitfield member for each platform and
subplatform, and initialize them in platform and subplatform descs.

The structure also contains a bitmap in a union for easier manipulation
of the bits.

Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
 .../drm/i915/display/intel_display_device.c   |  8 ++++++--
 .../drm/i915/display/intel_display_device.h   | 19 +++++++++++++++++++
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_device.c b/drivers/gpu/drm/i915/display/intel_display_device.c
index 336cc8e717f5..55ab1923c8b3 100644
--- a/drivers/gpu/drm/i915/display/intel_display_device.c
+++ b/drivers/gpu/drm/i915/display/intel_display_device.c
@@ -21,6 +21,7 @@ __diag_push();
 __diag_ignore_all("-Woverride-init", "Allow field initialization overrides for display info");
 
 struct subplatform_desc {
+	struct intel_display_platforms platforms;
 	enum intel_display_platform subplatform;
 	const char *name;
 	const u16 *pciidlist;
@@ -28,9 +29,11 @@ struct subplatform_desc {
 
 #define SUBPLATFORM(_platform, _subplatform)				\
 	.subplatform = (INTEL_DISPLAY_##_platform##_##_subplatform),	\
-	.name = #_subplatform
+	.name = #_subplatform,						\
+	.platforms._platform##_##_subplatform = 1
 
 struct platform_desc {
+	struct intel_display_platforms platforms;
 	enum intel_display_platform platform;
 	const char *name;
 	const struct subplatform_desc *subplatforms;
@@ -39,7 +42,8 @@ struct platform_desc {
 
 #define PLATFORM(_platform)			 \
 	.platform = (INTEL_DISPLAY_##_platform), \
-	.name = #_platform
+	.name = #_platform,			 \
+	.platforms._platform = 1
 
 #define ID(id) (id)
 
diff --git a/drivers/gpu/drm/i915/display/intel_display_device.h b/drivers/gpu/drm/i915/display/intel_display_device.h
index 0a78f7438035..6f8814d1fabd 100644
--- a/drivers/gpu/drm/i915/display/intel_display_device.h
+++ b/drivers/gpu/drm/i915/display/intel_display_device.h
@@ -6,6 +6,7 @@
 #ifndef __INTEL_DISPLAY_DEVICE_H__
 #define __INTEL_DISPLAY_DEVICE_H__
 
+#include <linux/bitops.h>
 #include <linux/types.h>
 
 #include "intel_display_conversion.h"
@@ -101,6 +102,24 @@ enum intel_display_platform {
 
 #undef __ENUM
 
+#define __MEMBER(name) unsigned long name:1;
+#define __COUNT(x) 1 +
+
+#define __NUM_PLATFORMS (INTEL_DISPLAY_PLATFORMS(__COUNT) 0)
+
+struct intel_display_platforms {
+	union {
+		struct {
+			INTEL_DISPLAY_PLATFORMS(__MEMBER);
+		};
+		DECLARE_BITMAP(bitmap, __NUM_PLATFORMS);
+	};
+};
+
+#undef __MEMBER
+#undef __COUNT
+#undef __NUM_PLATFORMS
+
 #define DEV_INFO_DISPLAY_FOR_EACH_FLAG(func) \
 	/* Keep in alphabetical order */ \
 	func(cursor_needs_physical); \
-- 
2.39.2