On Thu, Nov 23, 2017 at 09:14:44AM +0800, Yong wrote: > > On Wed, Nov 22, 2017 at 09:33:06AM +0800, Yong wrote: > > > > On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote: > > > > > Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface > > > > > and CSI1 is used for parallel interface. This is not documented in > > > > > datasheet but by testing and guess. > > > > > > > > > > This patch implement a v4l2 framework driver for it. > > > > > > > > > > Currently, the driver only support the parallel interface. MIPI-CSI2, > > > > > ISP's support are not included in this patch. > > > > > > > > > > Signed-off-by: Yong Deng <yong.deng@xxxxxxxxxxxx> > > > > > > > > Thanks again for this driver. > > > > > > > > It seems like at least this iteration is behaving in a weird way with > > > > DMA transfers for at least YU12 and NV12 (and I would assume YV12). > > > > > > > > Starting a transfer of multiple frames in either of these formats, > > > > using either ffmpeg (ffmpeg -f v4l2 -video_size 640x480 -framerate 30 > > > > -i /dev/video0 output.mkv) or yavta (yavta -c80 -p -F --skip 0 -f NV12 > > > > -s 640x480 $(media-c tl -e 'sun6i-csi')) will end up in a panic. > > > > > > > > The panic seems to be generated with random data going into parts of > > > > the kernel memory, the pattern being in my case something like > > > > 0x8287868a which is very odd (always around 0x88) > > > > > > > > It turns out that when you cover the sensor, the values change to > > > > around 0x28, so it really seems like it's pixels that have been copied > > > > there. > > > > > > > > I've looked quickly at the DMA setup, and it seems reasonable to > > > > me. Do you have the same issue on your side? Have you been able to > > > > test those formats using your hardware? > > > > > > I had tested the following formats with BT1120 input: > > > V4L2_PIX_FMT_NV12 -> NV12 > > > V4L2_PIX_FMT_NV21 -> NV21 > > > V4L2_PIX_FMT_NV16 -> NV16 > > > V4L2_PIX_FMT_NV61 -> NV61 > > > V4L2_PIX_FMT_YUV420 -> YU12 > > > V4L2_PIX_FMT_YVU420 -> YV12 > > > V4L2_PIX_FMT_YUV422P -> 422P > > > And they all work fine. > > > > Ok, that's good to know. > > > > > > Given that they all are planar formats and YUYV and the likes work > > > > just fine, maybe we can leave them aside for now? > > > > > > V4L2_PIX_FMT_YUV422P and V4L2_PIX_FMT_YUYV is OK, and V4L2_PIX_FMT_NV12 > > > is bad? It's really weird. > > > > > > What's your input bus code format, type and width? > > > > The sensor is an ov5640, so the MBUS code for the bus is > > MEDIA_BUS_FMT_YUYV8_2X8. > > Did you test on V3s? No, this is on an H3, but that would be the first difference so far. > I haven't tested it with MEDIA_BUS_FMT_YUYV8_2X8. Ok, it's good to know that at least it works on your end, it's useful for us to debug things :) > The Allwinner CSI's DMA is definitely weird. Ondřej Jirman thought > that CSI has an internal queue (Ondřej's commit has explained in detail). > I think CSI just pick up the buffer address before the frame done > interrupt triggered. > The patch in attachment can deal with this. You can see if it is > useful to solve your problem. I'll test that on monday, thanks! Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
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