Hi Steve, On 01/22/2019 12:35 AM, Steve Longerbeam wrote: > Repeatedly sending a stream off immediately followed by stream on can > eventually cause a complete system hard lockup on the SabreAuto when > streaming from the ADV7180: > > while true; do v4l2-ctl -d4 --stream-mmap --stream-count=3; done > > Eventually this either causes the system lockup or EOF timeouts at all > subsequent stream on, until a system reset. > > The lockup occurs when disabling the IDMA channels at stream off. Stopping > the video data stream entering the IDMA channel before disabling the > channel itself appears to be a reliable fix for the hard lockup. > > In the CSI subdevice, this can be done by disabling the CSI before > disabling the CSI IDMA channel, instead of after. In the IC-PRPENVVF > subdevice, this can be done by stopping upstream before disabling the > PRPENC/VF IDMA channel. Please let me know when you are satisfied with this patch series and I can make a pull request for this. Thanks! Hans > > History: > v4: > - Disabling SMFC will have no effect if both CSI's are streaming. So > go back to disabling CSI before channel as in v2, but split up > csi_idmac_stop such that ipu_csi_disable can still be called within > csi_stop. > > v3: > - Switch to disabling the SMFC before the channel, instead of the CSI > before the channel. > > v2: > - Whitespace fixes > - Add Fixes: and Cc: stable@xxxxxxxxxxxxxxx > - No functional changes. > > > Steve Longerbeam (3): > media: imx: csi: Disable CSI immediately after last EOF > media: imx: csi: Stop upstream before disabling IDMA channel > media: imx: prpencvf: Stop upstream before disabling IDMA channel > > drivers/staging/media/imx/imx-ic-prpencvf.c | 26 ++++++++----- > drivers/staging/media/imx/imx-media-csi.c | 42 +++++++++++++-------- > 2 files changed, 44 insertions(+), 24 deletions(-) >
