On 1/18/19 2:24 AM, Philipp Zabel wrote:
On Thu, 2019-01-17 at 12:49 -0800, 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@collabora.com Signed-off-by: Steve Longerbeam slongerbeam@gmail.com Cc: stable@vger.kernel.org
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);
Can you add a short comment why this call is here? Since now csi_idmac_stop is kind of a misnomer and symmetry with csi(_idmac)_start is broken, I think this is a bit un-obvious.
Yeah. I think a cleaner, more symmetric solution would be to split up csi_idmac_stop.
Also note that now the error path of csi_start() will now call ipu_csi_disable() while the CSI is disabled. This happens to work because that just calls ipu_module_disable(), which is not refcounted.
Thanks for catching. Splitting up csi_idmac_stop will fix this. Working on that.
Steve
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);
Reviewed-by: Philipp Zabel p.zabel@pengutronix.de
regards Philipp