lkml.org 
[lkml]   [2019]   [Mar]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 5.0 218/238] media: imx: csi: Disable CSI immediately after last EOF
    Date
    5.0-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Steve Longerbeam <slongerbeam@gmail.com>

    commit 2e0fe66e0a136252f4d89dbbccdcb26deb867eb8 upstream.

    Disable the CSI immediately after receiving the last EOF before stream
    off (and thus before disabling the IDMA channel). Do this by moving the
    wait for EOF completion into a new function csi_idmac_wait_last_eof().

    This fixes a complete system hard lockup on the SabreAuto when streaming
    from the ADV7180, by repeatedly sending a stream off immediately followed
    by stream on:

    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 channel at stream off. Disabling
    the CSI before disabling the IDMA channel appears to be a reliable fix for
    the hard lockup.

    Fixes: 4a34ec8e470cb ("[media] media: imx: Add CSI subdev driver")

    Reported-by: Gaël PORTAY <gael.portay@collabora.com>
    Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
    Cc: stable@vger.kernel.org # for 4.13 and up
    Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
    Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/staging/media/imx/imx-media-csi.c | 17 ++++++++++++++---
    1 file changed, 14 insertions(+), 3 deletions(-)

    --- a/drivers/staging/media/imx/imx-media-csi.c
    +++ b/drivers/staging/media/imx/imx-media-csi.c
    @@ -629,7 +629,7 @@ out_put_ipu:
    return ret;
    }

    -static void csi_idmac_stop(struct csi_priv *priv)
    +static void csi_idmac_wait_last_eof(struct csi_priv *priv)
    {
    unsigned long flags;
    int ret;
    @@ -646,7 +646,10 @@ static void csi_idmac_stop(struct csi_pr
    &priv->last_eof_comp, msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
    if (ret == 0)
    v4l2_warn(&priv->sd, "wait last EOF timeout\n");
    +}

    +static void csi_idmac_stop(struct csi_priv *priv)
    +{
    devm_free_irq(priv->dev, priv->eof_irq, priv);
    devm_free_irq(priv->dev, priv->nfb4eof_irq, priv);

    @@ -758,6 +761,16 @@ idmac_stop:

    static void csi_stop(struct csi_priv *priv)
    {
    + if (priv->dest == IPU_CSI_DEST_IDMAC)
    + csi_idmac_wait_last_eof(priv);
    +
    + /*
    + * Disable the CSI asap, after syncing with the last EOF.
    + * Doing so after the IDMA channel is disabled has shown to
    + * create hard system-wide hangs.
    + */
    + ipu_csi_disable(priv->csi);
    +
    if (priv->dest == IPU_CSI_DEST_IDMAC) {
    csi_idmac_stop(priv);

    @@ -765,8 +778,6 @@ static void csi_stop(struct csi_priv *pr
    if (priv->fim)
    imx_media_fim_set_stream(priv->fim, NULL, false);
    }
    -
    - ipu_csi_disable(priv->csi);
    }

    static const struct csi_skip_desc csi_skip[12] = {

    \
     
     \ /
      Last update: 2019-03-22 13:26    [W:3.087 / U:1.228 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site