media: atmel: atmel-isc-base: move cropping settings outside start_dma

The cropping configuration of the Parallel Front Engine (PFE) can be done
just once when the streaming starts. The ISC configuration is in place and
will not be changed while streaming.
It is not effective to keep rewriting the crop registers configuration
everytime start_dma is called, as this can be called for each queued
buffer.
Thus we can configure the cropping at start_streaming time.
This change moves the code to a dedicated function.
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/atmel/atmel-isc-base.c

@@ -132,12 +132,9 @@ static int isc_buffer_prepare(struct vb2_buffer *vb)
 	return 0;
 }
 
-static void isc_start_dma(struct isc_device *isc)
+static void isc_crop_pfe(struct isc_device *isc)
 {
 	struct regmap *regmap = isc->regmap;
-	u32 sizeimage = isc->fmt.fmt.pix.sizeimage;
-	u32 dctrl_dview;
-	dma_addr_t addr0;
 	u32 h, w;
 
 	h = isc->fmt.fmt.pix.height;
@@ -172,6 +169,14 @@ static void isc_start_dma(struct isc_device *isc)
 	regmap_update_bits(regmap, ISC_PFE_CFG0,
 			   ISC_PFE_CFG0_COLEN | ISC_PFE_CFG0_ROWEN,
 			   ISC_PFE_CFG0_COLEN | ISC_PFE_CFG0_ROWEN);
+}
+
+static void isc_start_dma(struct isc_device *isc)
+{
+	struct regmap *regmap = isc->regmap;
+	u32 sizeimage = isc->fmt.fmt.pix.sizeimage;
+	u32 dctrl_dview;
+	dma_addr_t addr0;
 
 	addr0 = vb2_dma_contig_plane_dma_addr(&isc->cur_frm->vb.vb2_buf, 0);
 	regmap_write(regmap, ISC_DAD0 + isc->offsets.dma, addr0);
@@ -369,6 +374,7 @@ static int isc_start_streaming(struct vb2_queue *vq, unsigned int count)
 					struct isc_buffer, list);
 	list_del(&isc->cur_frm->list);
 
+	isc_crop_pfe(isc);
 	isc_start_dma(isc);
 
 	spin_unlock_irqrestore(&isc->dma_queue_lock, flags);