The ast drivers stores the cursor image at the end of the video memory.
Add helpers to calculate the offset and size.
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
drivers/gpu/drm/ast/ast_cursor.c | 21 +++++++++++++++++++--
drivers/gpu/drm/ast/ast_drv.h | 1 +
2 files changed, 20 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/ast/ast_cursor.c b/drivers/gpu/drm/ast/ast_cursor.c
index 139ab00dee8f..05e297f30b4e 100644
--- a/drivers/gpu/drm/ast/ast_cursor.c
+++ b/drivers/gpu/drm/ast/ast_cursor.c
@@ -45,6 +45,21 @@
#define AST_HWC_SIGNATURE_HOTSPOTX 0x14
#define AST_HWC_SIGNATURE_HOTSPOTY 0x18
+static unsigned long ast_cursor_vram_size(void)
+{
+ return AST_HWC_SIZE + AST_HWC_SIGNATURE_SIZE;
+}
+
+long ast_cursor_vram_offset(struct ast_device *ast)
+{
+ unsigned long size = ast_cursor_vram_size();
+
+ if (size > ast->vram_size)
+ return -EINVAL;
+
+ return PAGE_ALIGN_DOWN(ast->vram_size - size);
+}
+
static u32 ast_cursor_calculate_checksum(const void *src, unsigned int width, unsigned int height)
{
u32 csum = 0;
@@ -276,7 +291,7 @@ int ast_cursor_plane_init(struct ast_device *ast)
struct drm_plane *cursor_plane = &ast_plane->base;
size_t size;
void __iomem *vaddr;
- u64 offset;
+ long offset;
int ret;
/*
@@ -290,7 +305,9 @@ int ast_cursor_plane_init(struct ast_device *ast)
return -ENOMEM;
vaddr = ast->vram + ast->vram_fb_available - size;
- offset = ast->vram_fb_available - size;
+ offset = ast_cursor_vram_offset(ast);
+ if (offset < 0)
+ return offset;
ret = ast_plane_init(dev, ast_plane, vaddr, offset, size,
0x01, &ast_cursor_plane_funcs,
diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h
index 2c7861835cfb..ec9ec77260e9 100644
--- a/drivers/gpu/drm/ast/ast_drv.h
+++ b/drivers/gpu/drm/ast/ast_drv.h
@@ -432,6 +432,7 @@ int ast_vga_output_init(struct ast_device *ast);
int ast_sil164_output_init(struct ast_device *ast);
/* ast_cursor.c */
+long ast_cursor_vram_offset(struct ast_device *ast);
int ast_cursor_plane_init(struct ast_device *ast);
/* ast dp501 */
--
2.48.1
