msm: mdss: add support for async position updates

Expose new ioctl for updating the layer position asynchronously.
Initially, pipes should be configured with async_update flag set
during the atomic commit, after which any number of position update
calls can be made. This would enable multiple position updates
within a single vsync. However, the screen update would happen
only after vsync, which would pick the latest update. Currently,
supported for video mode panels with single LM or dual LM with
src_split enabled. Only position updates are possible with no
scaling/cropping and each async layer should have unique z_order.

Change-Id: Ibb2804b59c6c980411396120e63167f18df5bc5b
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>
[cip@codeaurora.org: Resolved out-of-order merge conflict]
Signed-off-by: Clarence Ip <cip@codeaurora.org>

1 files changed, 67 insertions, 0 deletions

diff --git a/include/uapi/linux/msm_mdp_ext.h b/include/uapi/linux/msm_mdp_ext.h
index a224ff3f5267..634eec6ed1c5 100644
--- a/include/uapi/linux/msm_mdp_ext.h
+++ b/include/uapi/linux/msm_mdp_ext.h
@@ -7,6 +7,22 @@
 /* atomic commit ioctl used for validate and commit request */
 #define MSMFB_ATOMIC_COMMIT	_IOWR(MDP_IOCTL_MAGIC, 128, void *)
 
+/*
+ * Ioctl for updating the layer position asynchronously. Initially, pipes
+ * should be configured with MDP_LAYER_ASYNC flag set during the atomic commit,
+ * after which any number of position update calls can be made. This would
+ * enable multiple position updates within a single vsync. However, the screen
+ * update would happen only after vsync, which would pick the latest update.
+ *
+ * Limitations:
+ * - Currently supported only for video mode panels with single LM or dual LM
+ *   with source_split enabled.
+ * - Only position update is supported with no scaling/cropping.
+ * - Async layers should have unique z_order.
+ */
+#define MSMFB_ASYNC_POSITION_UPDATE _IOWR(MDP_IOCTL_MAGIC, 129, \
+					struct mdp_position_update)
+
 /**********************************************************************
 LAYER FLAG CONFIGURATION
 **********************************************************************/
@@ -40,6 +56,9 @@ LAYER FLAG CONFIGURATION
 /* layer contains bandwidth compressed format data */
 #define MDP_LAYER_BWC			0x80
 
+/* layer is async position updatable */
+#define MDP_LAYER_ASYNC			0x100
+
 /**********************************************************************
 VALIDATE/COMMIT FLAG CONFIGURATION
 **********************************************************************/
@@ -348,4 +367,52 @@ struct mdp_layer_commit {
 	};
 };
 
+struct mdp_point {
+	uint32_t x;
+	uint32_t y;
+};
+
+/*
+ * Async updatable layers. One layer holds configuration for one pipe.
+ */
+struct mdp_async_layer {
+	/*
+	 * Flag to enable/disable properties for layer configuration. Refer
+	 * layer flag config section for all possible flags.
+	 */
+	uint32_t flags;
+
+	/*
+	 * Pipe selection for this layer by client. Client provides the
+	 * pipe index that the device reserved during ATOMIC_COMMIT.
+	 */
+	uint32_t		pipe_ndx;
+
+	/* Source start x,y. */
+	struct mdp_point	src;
+
+	/* Destination start x,y. */
+	struct mdp_point	dst;
+
+	/*
+	 * This is an output parameter.
+	 *
+	 * Frame buffer device sets error code based on the failure.
+	 */
+	int			error_code;
+
+	uint32_t		reserved[3];
+};
+
+/*
+ * mdp_position_update - argument for ioctl MSMFB_ASYNC_POSITION_UPDATE
+ */
+struct mdp_position_update {
+	 /* Pointer to a list of async updatable input layers */
+	struct mdp_async_layer __user *input_layers;
+
+	/* Input layer count present in input list */
+	uint32_t input_layer_cnt;
+};
+
 #endif