Hi, I would like to explore what level of support is available in the v4l buffer exchange mechanism for USERPTR buffer exchange. In our internal release, we had a hack to support this feature. We use contiguous buffers in our user ptr hack implementation. The buffers are allocated in a kernel module that export api to pass the physical address of the allocated buffer to the user application. In the v4l2 driver, USERPTR IO mechanism will be requested, and in QBUF, the ptr passed to the driver is the above physical address. One thing we observed was that even in this case, we had to use index in the buffer structure without which it doesn't work. Anyone has any insight into how to port this capability to the open source kernel v4l2 driver? In other words, can I use userptr IO mechanism and pass contigous buffer address like above? If so, Is there a driver example I can refer to port this to my vpfe capture driver? Thanks in advance. Murali Karicheri Software Design Engineer Texas Instruments Inc. Germantown, MD 20874 email: m-karicheri2@xxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
