Hi Michael, Sorry for the late reply. On Thursday 30 June 2011 10:31:52 Michael Jones wrote: > Hi Laurent, > > I'm observing a system freeze-up with the ISP when writing data to memory > directly from the ccdc. > > Here's the sequence I'm using: > > 0. apply the patch I'm sending separate in this thread. > > 1. configure the ISP pipeline for the CCDC to deliver V4L2_PIX_FMT_GREY > directly from the sensor to memory. > > 2. yavta -c10 /dev/video2 > > The patch is pretty self-explanatory. It introduces a loop (with ugly > indenting to keep the patch simple) with 100 iterations leaving the device > open between them. My system usually hangs up within the first 30 > iterations. I've never made it to 100 successfully. I see the same > behavior with user pointers and with mmap, but I don't see it when using > data from the previewer. > > Can you please try this out with your setup? Even if you can't get 8-bit > gray data from your sensor, hopefully you could observe it with any other > format directly from the CCDC. > > I'll postpone further discussion until you confirm that you can reproduce > the behavior. As the patch illustrates, it looks like it is hanging up in > STREAMON. I've tested this with a serial CSI-2 sensor and a parallel sensor (MT9V032, in both 8-bit and 10-bit modes, albeit with SGRBG8 instead of GREY for the 8-bit mode), and I can't reproduce the issue. I thought I've asked you already but can't find this in my mailbox, so I apologize if I have, but could you try increasing vertical blanking and see if it helps ? -- Regards, Laurent Pinchart -- 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
