[PATCH 2/4] gpu: ipu-v3: prg: add function to get channel configure status

[Lucas Stach]

This allows channels using the PRG to check if a requested configuration
update has been applied or is still pending.

Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
---
 drivers/gpu/ipu-v3/ipu-prg.c | 16 ++++++++++++++++
 include/video/imx-ipu-v3.h   |  1 +
 2 files changed, 17 insertions(+)

diff --git a/drivers/gpu/ipu-v3/ipu-prg.c b/drivers/gpu/ipu-v3/ipu-prg.c
index 38a3a9764e49..f78463cf1c15 100644
--- a/drivers/gpu/ipu-v3/ipu-prg.c
+++ b/drivers/gpu/ipu-v3/ipu-prg.c
@@ -347,6 +347,22 @@ int ipu_prg_channel_configure(struct ipuv3_channel *ipu_chan,
 }
 EXPORT_SYMBOL_GPL(ipu_prg_channel_configure);
 
+int ipu_prg_channel_configure_done(struct ipuv3_channel *ipu_chan)
+{
+	int prg_chan = ipu_prg_ipu_to_prg_chan(ipu_chan->num);
+	struct ipu_prg *prg = ipu_chan->ipu->prg_priv;
+	struct ipu_prg_channel *chan;
+
+	if (prg_chan < 0)
+		return -EINVAL;
+
+	chan = &prg->chan[prg_chan];
+	WARN_ON(!chan->enabled);
+
+	return ipu_pre_update_done(prg->pres[chan->used_pre]);
+}
+EXPORT_SYMBOL_GPL(ipu_prg_channel_configure_done);
+
 static int ipu_prg_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
diff --git a/include/video/imx-ipu-v3.h b/include/video/imx-ipu-v3.h
index abbad94e14a1..45802eab1084 100644
--- a/include/video/imx-ipu-v3.h
+++ b/include/video/imx-ipu-v3.h
@@ -345,6 +345,7 @@ int ipu_prg_channel_configure(struct ipuv3_channel *ipu_chan,
 			      unsigned int axi_id,  unsigned int width,
 			      unsigned int height, unsigned int stride,
 			      u32 format, uint64_t modifier, unsigned long *eba);
+int ipu_prg_channel_configure_done(struct ipuv3_channel *ipu_chan);
 
 /*
  * IPU CMOS Sensor Interface (csi) functions
-- 
2.19.0