Add function drm_fb_cma_get_gem_addr() which return the physical address
of framebuffer (1st pixel). This function will usually be called by plane
callback (atomic_update).
Signed-off-by: Yannick Fertre <yannick.fertre@xxxxxx>
---
drivers/gpu/drm/drm_fb_cma_helper.c | 27 +++++++++++++++++++++++++++
include/drm/drm_fb_cma_helper.h | 4 ++++
2 files changed, 31 insertions(+)
diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c b/drivers/gpu/drm/drm_fb_cma_helper.c
index 74cd393..126f52a 100644
--- a/drivers/gpu/drm/drm_fb_cma_helper.c
+++ b/drivers/gpu/drm/drm_fb_cma_helper.c
@@ -260,6 +260,33 @@ struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct drm_framebuffer *fb,
EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_obj);
/**
+ * drm_fb_cma_get_gem_addr() - Get physical address for framebuffer
+ * @fb: The framebuffer
+ * @state: Which state of drm plane
+ * @plane: Which plane
+ * Return the CMA GEM address for given framebuffer.
+ *
+ * This function will usually be called from the PLANE callback functions.
+ */
+dma_addr_t drm_fb_cma_get_gem_addr(struct drm_framebuffer *fb,
+ struct drm_plane_state *state,
+ unsigned int plane)
+{
+ struct drm_fb_cma *fb_cma = to_fb_cma(fb);
+ dma_addr_t paddr;
+
+ if (plane >= 4)
+ return 0;
+
+ paddr = fb_cma->obj[plane]->paddr + fb->offsets[plane];
+ paddr += fb->format->cpp[plane] * (state->src_x >> 16);
+ paddr += fb->pitches[plane] * (state->src_y >> 16);
+
+ return paddr;
+}
+EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_addr);
+
+/**
* drm_fb_cma_prepare_fb() - Prepare CMA framebuffer
* @plane: Which plane
* @state: Plane state attach fence to
diff --git a/include/drm/drm_fb_cma_helper.h b/include/drm/drm_fb_cma_helper.h
index a5ecc0a..199a63f 100644
--- a/include/drm/drm_fb_cma_helper.h
+++ b/include/drm/drm_fb_cma_helper.h
@@ -41,6 +41,10 @@ struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev,
struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct drm_framebuffer *fb,
unsigned int plane);
+dma_addr_t drm_fb_cma_get_gem_addr(struct drm_framebuffer *fb,
+ struct drm_plane_state *state,
+ unsigned int plane);
+
int drm_fb_cma_prepare_fb(struct drm_plane *plane,
struct drm_plane_state *state);
--
1.9.1
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