4.14-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 @@ -538,7 +538,7 @@ 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; @@ -555,7 +555,10 @@ 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);
@@ -681,6 +684,16 @@ 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);
@@ -688,8 +701,6 @@ 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] = {