Re: [PATCH v2 1/2] media: imx: csi: Disable CSI immediately after last EOF

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Steeve, all,

On 1/17/19 3:49 PM, Steve Longerbeam wrote:
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 <gael.portay@xxxxxxxxxxxxx>
Signed-off-by: Steve Longerbeam <slongerbeam@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
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] = {


Tested-by: Gaël PORTAY <gael.portay@xxxxxxxxxxxxx>

Thanks,
Gael
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