Hi Philpp,

Please disregard this patch. A better solution to a busy wait with a spin lock held is to wait for all required EOF interrupts before doing tile completion processing. I will submit a new patch series.

Steve

On 6/9/20 5:51 PM, Steve Longerbeam wrote:

Call ipu_idmac_wait_busy() on each idmac channel to busy wait for the channel to be idle before disabling. Otherwise it was found that a conversion would stall after the completion of a tile and the start of the next tile.

Fixes: 0537db801bb01 ("gpu: ipu-v3: image-convert: reconfigure IC per tile") Signed-off-by: Steve Longerbeam slongerbeam@gmail.com

---

drivers/gpu/ipu-v3/ipu-image-convert.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/ipu-v3/ipu-image-convert.c b/drivers/gpu/ipu-v3/ipu-image-convert.c index eeca50d9a1ee..f0938015d2fd 100644 --- a/drivers/gpu/ipu-v3/ipu-image-convert.c +++ b/drivers/gpu/ipu-v3/ipu-image-convert.c @@ -1251,6 +1251,19 @@ static int get_run_count(struct ipu_image_convert_ctx *ctx, return count; }

+static void stop_channel(struct ipu_image_convert_chan *chan,

• 	 struct ipuv3_channel *channel)
  

+{

• struct ipu_image_convert_priv *priv = chan->priv;
• int ret;
• ret = ipu_idmac_wait_busy(channel, 1);
• if (ret == -ETIMEDOUT)

• dev_warn(priv->ipu->dev, "IDMAC timeout\n");
  

• ipu_idmac_disable_channel(channel);

+}

• static void convert_stop(struct ipu_image_convert_run *run) { struct ipu_image_convert_ctx *ctx = run->ctx;

@@ -1262,12 +1275,12 @@ static void convert_stop(struct ipu_image_convert_run *run)

/* disable IC tasks and the channels */ ipu_ic_task_disable(chan->ic);

• ipu_idmac_disable_channel(chan->in_chan);
• ipu_idmac_disable_channel(chan->out_chan);

• stop_channel(chan, chan->in_chan);

• stop_channel(chan, chan->out_chan);

  if (ipu_rot_mode_is_irt(ctx->rot_mode)) {

• ipu_idmac_disable_channel(chan->rotation_in_chan);
  

• ipu_idmac_disable_channel(chan->rotation_out_chan);
  

• stop_channel(chan, chan->rotation_in_chan);
  

• stop_channel(chan, chan->rotation_out_chan);
  

  ipu_idmac_unlink(chan->out_chan, chan->rotation_in_chan); }