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drm/ast: Add helper for computing framebuffer location in video memory

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The ast driver stores the primary plane's image in the framebuffer
memory up to where the cursor is located. Add helpers to calculate
the offset and size.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250305163207.267650-6-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2025-03-05 17:30:44 +01:00
parent 4ee3229bbe
commit ca7a8e8efc
1 changed files with 21 additions and 4 deletions
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25
drivers/gpu/drm/ast/ast_mode.c
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@ -51,6 +51,24 @@
#define AST_LUT_SIZE 256
static unsigned long ast_fb_vram_offset(void)
{
return 0; // with shmem, the primary plane is always at offset 0
}
static unsigned long ast_fb_vram_size(struct ast_device *ast)
{
struct drm_device *dev = &ast->base;
unsigned long offset = ast_fb_vram_offset(); // starts at offset
long cursor_offset = ast_cursor_vram_offset(ast); // ends at cursor offset
if (cursor_offset < 0)
cursor_offset = ast->vram_size; // no cursor; it's all ours
if (drm_WARN_ON_ONCE(dev, offset > cursor_offset))
return 0; // cannot legally happen; signal error
return cursor_offset - offset;
}
static inline void ast_load_palette_index(struct ast_device *ast,
u8 index, u8 red, u8 green,
u8 blue)
@ -609,9 +627,8 @@ static int ast_primary_plane_init(struct ast_device *ast)
struct ast_plane *ast_primary_plane = &ast->primary_plane;
struct drm_plane *primary_plane = &ast_primary_plane->base;
void __iomem *vaddr = ast->vram;
u64 offset = 0; /* with shmem, the primary plane is always at offset 0 */
unsigned long cursor_size = roundup(AST_HWC_SIZE + AST_HWC_SIGNATURE_SIZE, PAGE_SIZE);
unsigned long size = ast->vram_fb_available - cursor_size;
u64 offset = ast_fb_vram_offset();
unsigned long size = ast_fb_vram_size(ast);
int ret;
ret = ast_plane_init(dev, ast_primary_plane, vaddr, offset, size,
@ -942,7 +959,7 @@ static enum drm_mode_status ast_mode_config_mode_valid(struct drm_device *dev,
struct ast_device *ast = to_ast_device(dev);
unsigned long fbsize, fbpages, max_fbpages;
max_fbpages = (ast->vram_fb_available) >> PAGE_SHIFT;
max_fbpages = ast_fb_vram_size(ast) >> PAGE_SHIFT;
fbsize = mode->hdisplay * mode->vdisplay * max_bpp;
fbpages = DIV_ROUND_UP(fbsize, PAGE_SIZE);