Hi, Any suggestion here? Murali Karicheri Software Design Engineer Texas Instruments Inc. Germantown, MD 20874 email: m-karicheri2@xxxxxx >-----Original Message----- >From: linux-media-owner@xxxxxxxxxxxxxxx [mailto:linux-media- >owner@xxxxxxxxxxxxxxx] On Behalf Of Karicheri, Muralidharan >Sent: Friday, June 12, 2009 10:57 AM >To: linux-media@xxxxxxxxxxxxxxx >Subject: USERPTR buffer exchange mechanism > >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 -- 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
