linux-kernel - [PATCH v1 03/10] drm/panthor: Introduce framework for architecture-specific features

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Message-ID: <20251014094337.1009601-4-karunika.choo@arm.com>
Date: Tue, 14 Oct 2025 10:43:30 +0100
From: Karunika Choo <karunika.choo@....com>
To: dri-devel@...ts.freedesktop.org
Cc: nd@....com,
	Boris Brezillon <boris.brezillon@...labora.com>,
	Steven Price <steven.price@....com>,
	Liviu Dudau <liviu.dudau@....com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 03/10] drm/panthor: Introduce framework for architecture-specific features

Add a framework to support architecture-specific features. This allows
other parts of the driver to adjust their behaviour based on the feature
bits enabled for a given architecture.

Signed-off-by: Karunika Choo <karunika.choo@....com>
---
 drivers/gpu/drm/panthor/panthor_hw.c |  5 +++++
 drivers/gpu/drm/panthor/panthor_hw.h | 18 ++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/panthor/panthor_hw.c b/drivers/gpu/drm/panthor/panthor_hw.c
index b6e7401327c3..34536526384d 100644
--- a/drivers/gpu/drm/panthor/panthor_hw.c
+++ b/drivers/gpu/drm/panthor/panthor_hw.c
@@ -186,3 +186,8 @@ int panthor_hw_init(struct panthor_device *ptdev)
 
 	return 0;
 }
+
+bool panthor_hw_has_feature(struct panthor_device *ptdev, enum panthor_hw_feature feature)
+{
+	return test_bit(feature, ptdev->hw->features);
+}
diff --git a/drivers/gpu/drm/panthor/panthor_hw.h b/drivers/gpu/drm/panthor/panthor_hw.h
index 39752de3e7ad..7a191e76aeec 100644
--- a/drivers/gpu/drm/panthor/panthor_hw.h
+++ b/drivers/gpu/drm/panthor/panthor_hw.h
@@ -4,14 +4,32 @@
 #ifndef __PANTHOR_HW_H__
 #define __PANTHOR_HW_H__
 
+#include <linux/types.h>
+
 struct panthor_device;
 
+/**
+ * enum panthor_hw_feature - Bit position of each HW feature
+ *
+ * Used to define GPU specific features based on the GPU architecture ID.
+ * New feature flags will be added with support for newer GPU architectures.
+ */
+enum panthor_hw_feature {
+	/** @PANTHOR_HW_FEATURES_END: Must be last. */
+	PANTHOR_HW_FEATURES_END
+};
+
+
 /**
  * struct panthor_hw - GPU specific register mapping and functions
  */
 struct panthor_hw {
+	/** @features: Bitmap containing panthor_hw_feature */
+	DECLARE_BITMAP(features, PANTHOR_HW_FEATURES_END);
 };
 
 int panthor_hw_init(struct panthor_device *ptdev);
 
+bool panthor_hw_has_feature(struct panthor_device *ptdev, enum panthor_hw_feature feature);
+
 #endif /* __PANTHOR_HW_H__ */
-- 
2.49.0