On Tue, 21 Nov 2017 16:48:27 +0100 Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx> wrote: > Hi, > > 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. > > 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? > > Thanks! > Maxime > > -- > Maxime Ripard, Free Electrons > Embedded Linux and Kernel engineering > http://free-electrons.com Thanks, Yong
