DRM uses a magic number of 4 for the maximum number of planes per color
format. Declare this constant via DRM_FORMAT_MAX_PLANES and update the
related code. Some code depends on the length of arrays that are now
declared with DRM_FORMAT_MAX_PLANES. Convert it from '4' to ARRAY_SIZE.
v2:
* mention usage of ARRAY_SIZE() in the commit message (Maxime)
* also fix error handling in drm_gem_fb_init_with_funcs()
(kernel test robot)
* include <drm/drm_fourcc.h> for DRM_FORMAT_MAX_PLANES
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
drivers/gpu/drm/drm_gem_framebuffer_helper.c | 19 +++++++++++--------
include/drm/drm_fourcc.h | 13 +++++++++----
include/drm/drm_framebuffer.h | 8 ++++----
include/drm/drm_gem_atomic_helper.h | 3 ++-
4 files changed, 26 insertions(+), 17 deletions(-)
diff --git a/drivers/gpu/drm/drm_gem_framebuffer_helper.c b/drivers/gpu/drm/drm_gem_framebuffer_helper.c
index 67bc9edc1d98..421e029a6b3e 100644
--- a/drivers/gpu/drm/drm_gem_framebuffer_helper.c
+++ b/drivers/gpu/drm/drm_gem_framebuffer_helper.c
@@ -48,7 +48,7 @@
struct drm_gem_object *drm_gem_fb_get_obj(struct drm_framebuffer *fb,
unsigned int plane)
{
- if (plane >= 4)
+ if (plane >= ARRAY_SIZE(fb->obj))
return NULL;
return fb->obj[plane];
@@ -62,7 +62,8 @@ drm_gem_fb_init(struct drm_device *dev,
struct drm_gem_object **obj, unsigned int num_planes,
const struct drm_framebuffer_funcs *funcs)
{
- int ret, i;
+ unsigned int i;
+ int ret;
drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
@@ -86,9 +87,9 @@ drm_gem_fb_init(struct drm_device *dev,
*/
void drm_gem_fb_destroy(struct drm_framebuffer *fb)
{
- int i;
+ size_t i;
- for (i = 0; i < 4; i++)
+ for (i = 0; i < ARRAY_SIZE(fb->obj); i++)
drm_gem_object_put(fb->obj[i]);
drm_framebuffer_cleanup(fb);
@@ -145,8 +146,9 @@ int drm_gem_fb_init_with_funcs(struct drm_device *dev,
const struct drm_framebuffer_funcs *funcs)
{
const struct drm_format_info *info;
- struct drm_gem_object *objs[4];
- int ret, i;
+ struct drm_gem_object *objs[DRM_FORMAT_MAX_PLANES];
+ unsigned int i;
+ int ret;
info = drm_get_format_info(dev, mode_cmd);
if (!info) {
@@ -187,9 +189,10 @@ int drm_gem_fb_init_with_funcs(struct drm_device *dev,
return 0;
err_gem_object_put:
- for (i--; i >= 0; i--)
+ while (i > 0) {
+ --i;
drm_gem_object_put(objs[i]);
-
+ }
return ret;
}
EXPORT_SYMBOL_GPL(drm_gem_fb_init_with_funcs);
diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
index 3b138d4ae67e..22aa64d07c79 100644
--- a/include/drm/drm_fourcc.h
+++ b/include/drm/drm_fourcc.h
@@ -25,6 +25,11 @@
#include <linux/types.h>
#include <uapi/drm/drm_fourcc.h>
+/**
+ * DRM_FORMAT_MAX_PLANES - maximum number of planes a DRM format can have
+ */
+#define DRM_FORMAT_MAX_PLANES 4u
+
/*
* DRM formats are little endian. Define host endian variants for the
* most common formats here, to reduce the #ifdefs needed in drivers.
@@ -78,7 +83,7 @@ struct drm_format_info {
* triplet @char_per_block, @block_w, @block_h for better
* describing the pixel format.
*/
- u8 cpp[4];
+ u8 cpp[DRM_FORMAT_MAX_PLANES];
/**
* @char_per_block:
@@ -104,7 +109,7 @@ struct drm_format_info {
* information from their drm_mode_config.get_format_info hook
* if they want the core to be validating the pitch.
*/
- u8 char_per_block[4];
+ u8 char_per_block[DRM_FORMAT_MAX_PLANES];
};
/**
@@ -113,7 +118,7 @@ struct drm_format_info {
* Block width in pixels, this is intended to be accessed through
* drm_format_info_block_width()
*/
- u8 block_w[4];
+ u8 block_w[DRM_FORMAT_MAX_PLANES];
/**
* @block_h:
@@ -121,7 +126,7 @@ struct drm_format_info {
* Block height in pixels, this is intended to be accessed through
* drm_format_info_block_height()
*/
- u8 block_h[4];
+ u8 block_h[DRM_FORMAT_MAX_PLANES];
/** @hsub: Horizontal chroma subsampling factor */
u8 hsub;
diff --git a/include/drm/drm_framebuffer.h b/include/drm/drm_framebuffer.h
index be658ebbec72..f67c5b7bcb68 100644
--- a/include/drm/drm_framebuffer.h
+++ b/include/drm/drm_framebuffer.h
@@ -27,12 +27,12 @@
#include <linux/list.h>
#include <linux/sched.h>
+#include <drm/drm_fourcc.h>
#include <drm/drm_mode_object.h>
struct drm_clip_rect;
struct drm_device;
struct drm_file;
-struct drm_format_info;
struct drm_framebuffer;
struct drm_gem_object;
@@ -147,7 +147,7 @@ struct drm_framebuffer {
* @pitches: Line stride per buffer. For userspace created object this
* is copied from drm_mode_fb_cmd2.
*/
- unsigned int pitches[4];
+ unsigned int pitches[DRM_FORMAT_MAX_PLANES];
/**
* @offsets: Offset from buffer start to the actual pixel data in bytes,
* per buffer. For userspace created object this is copied from
@@ -165,7 +165,7 @@ struct drm_framebuffer {
* data (even for linear buffers). Specifying an x/y pixel offset is
* instead done through the source rectangle in &struct drm_plane_state.
*/
- unsigned int offsets[4];
+ unsigned int offsets[DRM_FORMAT_MAX_PLANES];
/**
* @modifier: Data layout modifier. This is used to describe
* tiling, or also special layouts (like compression) of auxiliary
@@ -210,7 +210,7 @@ struct drm_framebuffer {
* This is used by the GEM framebuffer helpers, see e.g.
* drm_gem_fb_create().
*/
- struct drm_gem_object *obj[4];
+ struct drm_gem_object *obj[DRM_FORMAT_MAX_PLANES];
};
#define obj_to_fb(x) container_of(x, struct drm_framebuffer, base)
diff --git a/include/drm/drm_gem_atomic_helper.h b/include/drm/drm_gem_atomic_helper.h
index d82c23622156..f9f8b6f0494a 100644
--- a/include/drm/drm_gem_atomic_helper.h
+++ b/include/drm/drm_gem_atomic_helper.h
@@ -5,6 +5,7 @@
#include <linux/dma-buf-map.h>
+#include <drm/drm_fourcc.h>
#include <drm/drm_plane.h>
struct drm_simple_display_pipe;
@@ -40,7 +41,7 @@ struct drm_shadow_plane_state {
* The memory mappings stored in map should be established in the plane's
* prepare_fb callback and removed in the cleanup_fb callback.
*/
- struct dma_buf_map map[4];
+ struct dma_buf_map map[DRM_FORMAT_MAX_PLANES];
};
/**
--
2.32.0
