Instead of restarting the R-Car CSI-2 receiver if a transmission error
is detected, inform the R-Car VIN driver of the error so it can stop the
whole pipeline and inform user-space. This is done to reflect a updated
usage recommendation in later versions of the datasheet.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
Reviewed-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
---
* Changes since v3
- Switch to new V4L2_EVENT_XFER_ERROR from V4L2_EVENT_EOS.
- Disable error interrupts after the first one to not spam the error
event.
* Changes since v2
- Update spelling in commit message.
---
drivers/media/platform/rcar-vin/rcar-csi2.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
index 11848d0c4a55cb4c..427c236243a03ec2 100644
--- a/drivers/media/platform/rcar-vin/rcar-csi2.c
+++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
@@ -902,21 +902,22 @@ static irqreturn_t rcsi2_irq(int irq, void *data)
rcsi2_write(priv, INTERRSTATE_REG, err_status);
- dev_info(priv->dev, "Transfer error, restarting CSI-2 receiver\n");
-
return IRQ_WAKE_THREAD;
}
static irqreturn_t rcsi2_irq_thread(int irq, void *data)
{
struct rcar_csi2 *priv = data;
+ struct v4l2_event event = {
+ .type = V4L2_EVENT_XFER_ERROR,
+ };
- mutex_lock(&priv->lock);
- rcsi2_stop(priv);
- usleep_range(1000, 2000);
- if (rcsi2_start(priv))
- dev_warn(priv->dev, "Failed to restart CSI-2 receiver\n");
- mutex_unlock(&priv->lock);
+ /* Disable further interrupts to not spam the transfer error event. */
+ rcsi2_write(priv, INTEN_REG, 0);
+
+ dev_err(priv->dev, "Transfer error detected.\n");
+
+ v4l2_subdev_notify_event(&priv->subdev, &event);
return IRQ_HANDLED;
}
--
2.33.1
