[lkml]   [2019]   [Jan]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH v2 1/2] media: imx: csi: Disable CSI immediately after last EOF
Disable the CSI immediately after receiving the last EOF before stream
off (and thus before disabling the IDMA channel).

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 <>
Signed-off-by: Steve Longerbeam <>
Changes in v2:
- restore an empty line
- Add Fixes: and Cc: stable
drivers/staging/media/imx/imx-media-csi.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index e18f58f56dfb..e0f6f88e2e70 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -681,6 +681,8 @@ static void csi_idmac_stop(struct csi_priv *priv)
if (ret == 0)
v4l2_warn(&priv->sd, "wait last EOF timeout\n");

+ ipu_csi_disable(priv->csi);
devm_free_irq(priv->dev, priv->eof_irq, priv);
devm_free_irq(priv->dev, priv->nfb4eof_irq, priv);

@@ -793,9 +795,9 @@ static void csi_stop(struct csi_priv *priv)
/* stop the frame interval monitor */
if (priv->fim)
imx_media_fim_set_stream(priv->fim, NULL, false);
+ } else {
+ ipu_csi_disable(priv->csi);
- ipu_csi_disable(priv->csi);

static const struct csi_skip_desc csi_skip[12] = {
 \ /
  Last update: 2019-01-17 21:50    [W:0.106 / U:2.120 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site