Re: [PATCH v6] media: platform: Renesas IMR driver

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Hello!

On 07/06/2017 09:16 PM, Sergei Shtylyov wrote:

[...]
+=========================================
+
+This file documents some driver-specific aspects of the IMR driver, such as
+driver-specific ioctls.
+
+The ioctl reference
+~~~~~~~~~~~~~~~~~~~
+
+VIDIOC_IMR_MESH - Set mapping data
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Argument: struct imr_map_desc
+
+**Description**:
+
+    This ioctl sets up the mesh using which the input frames will be

s/using/through/

+    transformed into the output frames. The mesh can be strictly rectangular
+    (when IMR_MAP_MESH bit is set in imr_map_desc::type) or arbitrary (when
+    that bit is not set).
+
+    A rectangular mesh consists of the imr_mesh structure followed by M*N
+    vertex objects (where M is imr_mesh::rows and N is imr_mesh::columns).
+    In case either IMR_MAP_AUTOSG or IMR_MAP_AUTODG bits were set in
+    imr_map_desc::type, imr_mesh::{x|y}0 specify the coordinates of the top
+    left corner of the auto-generated mesh and imr_mesh::d{x|y} specify the
+    mesh's X/Y steps.

What if any of the other types are used like IMR_MAP_LUCE?

   IMR_MAP_LUCE only affects the vertex object.

Is this documented in a Renesas datasheet?

   Yes.

Well, not exactly. The different mesh types are a software concept, the hardware only understands series of triangles.

[...]

Regards,

    Hans

MBR, Sergei

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