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authorMarek Vasut <marex@denx.de>2016-11-14 13:07:31 +0300
committerDaniel Vetter <daniel.vetter@ffwll.ch>2016-11-14 14:43:58 +0300
commit14d7f96f90fb65c2ca0e0ac7df237e06ff001c29 (patch)
tree87f8c0d593f6e349a00307ba7f1df5c298a46289 /drivers/gpu/drm/drm_fb_cma_helper.c
parent3da6c2f3b730cea04938e612e7f26dfbf2db9641 (diff)
downloadlinux-14d7f96f90fb65c2ca0e0ac7df237e06ff001c29.tar.xz
drm/fb_cma_helper: Add drm_fb_cma_prepare_fb() helper
Add new drm_fb_cma_prepare_fb() helper function extracted from the imx-drm driver. This function checks if the plane has DMABUF attached to it, extracts the exclusive fence from it and attaches it to the plane state for the atomic helper to wait on it. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Lucas Stach <l.stach@pengutronix.de> Reviewed-by: Lucas Stach <l.stach@pengutronix.de> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20161114100732.3446-1-marex@denx.de
Diffstat (limited to 'drivers/gpu/drm/drm_fb_cma_helper.c')
-rw-r--r--drivers/gpu/drm/drm_fb_cma_helper.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c b/drivers/gpu/drm/drm_fb_cma_helper.c
index 8bac57e2e41c..81b3558302b5 100644
--- a/drivers/gpu/drm/drm_fb_cma_helper.c
+++ b/drivers/gpu/drm/drm_fb_cma_helper.c
@@ -18,13 +18,16 @@
*/
#include <drm/drmP.h>
+#include <drm/drm_atomic.h>
#include <drm/drm_crtc.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_fb_cma_helper.h>
+#include <linux/dma-buf.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>
+#include <linux/reservation.h>
#define DEFAULT_FBDEFIO_DELAY_MS 50
@@ -265,6 +268,38 @@ 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_prepare_fb() - Prepare CMA framebuffer
+ * @plane: Which plane
+ * @state: Plane state attach fence to
+ *
+ * This should be put into prepare_fb hook of struct &drm_plane_helper_funcs .
+ *
+ * This function checks if the plane FB has an dma-buf attached, extracts
+ * the exclusive fence and attaches it to plane state for the atomic helper
+ * to wait on.
+ *
+ * There is no need for cleanup_fb for CMA based framebuffer drivers.
+ */
+int drm_fb_cma_prepare_fb(struct drm_plane *plane,
+ struct drm_plane_state *state)
+{
+ struct dma_buf *dma_buf;
+ struct dma_fence *fence;
+
+ if ((plane->state->fb == state->fb) || !state->fb)
+ return 0;
+
+ dma_buf = drm_fb_cma_get_gem_obj(state->fb, 0)->base.dma_buf;
+ if (dma_buf) {
+ fence = reservation_object_get_excl_rcu(dma_buf->resv);
+ drm_atomic_set_fence_for_plane(state, fence);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(drm_fb_cma_prepare_fb);
+
#ifdef CONFIG_DEBUG_FS
static void drm_fb_cma_describe(struct drm_framebuffer *fb, struct seq_file *m)
{