[PATCH v3 3/7] exynos/fimg2d: add g2d_config_event

[Tobias Jakobi]

This enables us to pass command buffers to the kernel which
trigger an event on the DRM fd upon completion.
The final goal is to enable asynchronous operation of the
G2D engine, similar to async page flips.

Passing the event userdata pointer through the G2D context
was chosen to not change the current API (e.g. by adding
a userdata argument to each public functions).

Signed-off-by: Tobias Jakobi <tjakobi at math.uni-bielefeld.de>
---
 exynos/exynos_fimg2d.c | 27 +++++++++++++++++++++++++--
 exynos/exynos_fimg2d.h |  2 ++
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/exynos/exynos_fimg2d.c b/exynos/exynos_fimg2d.c
index fc605ed..e90ffed 100644
--- a/exynos/exynos_fimg2d.c
+++ b/exynos/exynos_fimg2d.c
@@ -202,8 +202,15 @@ static int g2d_flush(struct g2d_context *ctx)
 	cmdlist.cmd_buf = (uint64_t)(uintptr_t)&ctx->cmd_buf[0];
 	cmdlist.cmd_nr = ctx->cmd_nr;
 	cmdlist.cmd_buf_nr = ctx->cmd_buf_nr;
-	cmdlist.event_type = G2D_EVENT_NOT;
-	cmdlist.user_data = 0;
+
+	if (ctx->event_userdata) {
+		cmdlist.event_type = G2D_EVENT_NONSTOP;
+		cmdlist.user_data = (uint64_t)(uintptr_t)(ctx->event_userdata);
+		ctx->event_userdata = NULL;
+	} else {
+		cmdlist.event_type = G2D_EVENT_NOT;
+		cmdlist.user_data = 0;
+	}
 
 	ctx->cmd_nr = 0;
 	ctx->cmd_buf_nr = 0;
@@ -259,6 +266,22 @@ drm_public void g2d_fini(struct g2d_context *ctx)
 }
 
 /**
+ * g2d_config_event - setup userdata configuration for a g2d event.
+ *		The next invocation of a g2d call (e.g. g2d_solid_fill) is
+ *		then going to flag the command buffer as 'nonstop'.
+ *		Completion of the command buffer execution can then be
+ *		determined by using drmHandleEvent on the DRM fd.
+ *		The userdata is 'consumed' in the process.
+ *
+ * @ctx: a pointer to g2d_context structure.
+ * @userdata: a pointer to the user data
+ */
+drm_public void g2d_config_event(struct g2d_context *ctx, void *userdata)
+{
+	ctx->event_userdata = userdata;
+}
+
+/**
  * g2d_exec - start the dma to process all commands summited by g2d_flush().
  *
  * @ctx: a pointer to g2d_context structure.
diff --git a/exynos/exynos_fimg2d.h b/exynos/exynos_fimg2d.h
index 9db0c88..421249d 100644
--- a/exynos/exynos_fimg2d.h
+++ b/exynos/exynos_fimg2d.h
@@ -298,10 +298,12 @@ struct g2d_context {
 	unsigned int			cmd_nr;
 	unsigned int			cmd_buf_nr;
 	unsigned int			cmdlist_nr;
+	void				*event_userdata;
 };
 
 struct g2d_context *g2d_init(int fd);
 void g2d_fini(struct g2d_context *ctx);
+void g2d_config_event(struct g2d_context *ctx, void *userdata);
 int g2d_exec(struct g2d_context *ctx);
 int g2d_solid_fill(struct g2d_context *ctx, struct g2d_image *img,
 			unsigned int x, unsigned int y, unsigned int w,
-- 
2.0.5