[PATCH 3/3] drm/panthor: Relax the check on the tiler chunk size

[Boris Brezillon]

The field used to store the chunk size if 12 bits wide, and the encoding
is chunk_size = chunk_header.chunk_size << 12, which gives us a
theoretical [4k:8M] range. This range is further limited by
implementation constraints, but those shouldn't be enforced kernel side.

Fixes: 9cca48fa4f89 ("drm/panthor: Add the heap logical block")
Signed-off-by: Boris Brezillon <boris.brezillon at collabora.com>
---
 drivers/gpu/drm/panthor/panthor_heap.c | 2 +-
 include/uapi/drm/panthor_drm.h         | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/panthor/panthor_heap.c b/drivers/gpu/drm/panthor/panthor_heap.c
index 8728c9bb76e4..146ea2f57764 100644
--- a/drivers/gpu/drm/panthor/panthor_heap.c
+++ b/drivers/gpu/drm/panthor/panthor_heap.c
@@ -285,7 +285,7 @@ int panthor_heap_create(struct panthor_heap_pool *pool,
 		return -EINVAL;
 
 	if (hweight32(chunk_size) != 1 ||
-	    chunk_size < SZ_256K || chunk_size > SZ_2M)
+	    chunk_size < SZ_4K || chunk_size > SZ_8M)
 		return -EINVAL;
 
 	down_read(&pool->lock);
diff --git a/include/uapi/drm/panthor_drm.h b/include/uapi/drm/panthor_drm.h
index 5db80a0682d5..80c0716361b9 100644
--- a/include/uapi/drm/panthor_drm.h
+++ b/include/uapi/drm/panthor_drm.h
@@ -898,7 +898,7 @@ struct drm_panthor_tiler_heap_create {
 	/** @initial_chunk_count: Initial number of chunks to allocate. Must be at least one. */
 	__u32 initial_chunk_count;
 
-	/** @chunk_size: Chunk size. Must be a power of two at least 256KB large. */
+	/** @chunk_size: Chunk size. Must be a power of two and lie in the [4k:8M] range. */
 	__u32 chunk_size;
 
 	/**
-- 
2.44.0