[media] v4l: ti-vpe: Fix some params in VPE data descriptors

Some parameters of the VPE descriptors were understood incorrectly. They are now
fixed. The fixes are explained as follows:

- When adding an inbound data descriptor to the VPDMA descriptor list, we intend
  to use c_rect as the cropped region fetched by VPDMA. Therefore, c_rect->width
  shouldn't be used to calculate the line stride, the original image width
  should be used for that. We add a 'width' argument which gives the buffer
  width in memory.

- frame_width and frame_height describe the complete width and height of the
  client to which the channel is connected. If there are multiple channels
  fetching data and providing to the same client, the above 2 arguments should
  be the width and height of the region covered by all the channels. In the case
  where there is only one channel providing pixel data to the client
  (like in VPE), frame_width and frame_height should be the cropped width and
  cropped height respectively. The calculation of these params is done in the
  vpe driver now.

- start_h and start_v is also used in the case of multiple channels to describe
  where each channel should start filling pixel data. We don't use this in VPE,
  and pass 0s to the vpdma_add_in_dtd() helper.

- Some minor changes are made to the vpdma_add_out_dtd() helper. The c_rect
  param is used for specifying the 'composition' target, and 'width'  is added
  to calculate the line stride.

Signed-off-by: Archit Taneja <archit@ti.com>
Acked-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 46 insertions, 14 deletions

diff --git a/drivers/media/platform/ti-vpe/vpdma.c b/drivers/media/platform/ti-vpe/vpdma.c
index 73dd38eab582..a51a01359805 100644
--- a/drivers/media/platform/ti-vpe/vpdma.c
+++ b/drivers/media/platform/ti-vpe/vpdma.c
@@ -614,8 +614,17 @@ static void dump_dtd(struct vpdma_dtd *dtd)
 /*
  * append an outbound data transfer descriptor to the given descriptor list,
  * this sets up a 'client to memory' VPDMA transfer for the given VPDMA channel
+ *
+ * @list: vpdma desc list to which we add this decriptor
+ * @width: width of the image in pixels in memory
+ * @c_rect: compose params of output image
+ * @fmt: vpdma data format of the buffer
+ * dma_addr: dma address as seen by VPDMA
+ * chan: VPDMA channel
+ * flags: VPDMA flags to configure some descriptor fileds
  */
-void vpdma_add_out_dtd(struct vpdma_desc_list *list, struct v4l2_rect *c_rect,
+void vpdma_add_out_dtd(struct vpdma_desc_list *list, int width,
+		const struct v4l2_rect *c_rect,
 		const struct vpdma_data_format *fmt, dma_addr_t dma_addr,
 		enum vpdma_channel chan, u32 flags)
 {
@@ -623,6 +632,7 @@ void vpdma_add_out_dtd(struct vpdma_desc_list *list, struct v4l2_rect *c_rect,
 	int field = 0;
 	int notify = 1;
 	int channel, next_chan;
+	struct v4l2_rect rect = *c_rect;
 	int depth = fmt->depth;
 	int stride;
 	struct vpdma_dtd *dtd;
@@ -630,11 +640,15 @@ void vpdma_add_out_dtd(struct vpdma_desc_list *list, struct v4l2_rect *c_rect,
 	channel = next_chan = chan_info[chan].num;
 
 	if (fmt->type == VPDMA_DATA_FMT_TYPE_YUV &&
-			fmt->data_type == DATA_TYPE_C420)
+			fmt->data_type == DATA_TYPE_C420) {
+		rect.height >>= 1;
+		rect.top >>= 1;
 		depth = 8;
+	}
 
-	stride = ALIGN((depth * c_rect->width) >> 3, VPDMA_STRIDE_ALIGN);
-	dma_addr += (c_rect->left * depth) >> 3;
+	stride = ALIGN((depth * width) >> 3, VPDMA_STRIDE_ALIGN);
+
+	dma_addr += rect.top * stride + (rect.left * depth >> 3);
 
 	dtd = list->next;
 	WARN_ON((void *)(dtd + 1) > (list->buf.addr + list->buf.size));
@@ -664,31 +678,48 @@ void vpdma_add_out_dtd(struct vpdma_desc_list *list, struct v4l2_rect *c_rect,
 /*
  * append an inbound data transfer descriptor to the given descriptor list,
  * this sets up a 'memory to client' VPDMA transfer for the given VPDMA channel
+ *
+ * @list: vpdma desc list to which we add this decriptor
+ * @width: width of the image in pixels in memory(not the cropped width)
+ * @c_rect: crop params of input image
+ * @fmt: vpdma data format of the buffer
+ * dma_addr: dma address as seen by VPDMA
+ * chan: VPDMA channel
+ * field: top or bottom field info of the input image
+ * flags: VPDMA flags to configure some descriptor fileds
+ * frame_width/height: the complete width/height of the image presented to the
+ *			client (this makes sense when multiple channels are
+ *			connected to the same client, forming a larger frame)
+ * start_h, start_v: position where the given channel starts providing pixel
+ *			data to the client (makes sense when multiple channels
+ *			contribute to the client)
  */
-void vpdma_add_in_dtd(struct vpdma_desc_list *list, int frame_width,
-		int frame_height, struct v4l2_rect *c_rect,
+void vpdma_add_in_dtd(struct vpdma_desc_list *list, int width,
+		const struct v4l2_rect *c_rect,
 		const struct vpdma_data_format *fmt, dma_addr_t dma_addr,
-		enum vpdma_channel chan, int field, u32 flags)
+		enum vpdma_channel chan, int field, u32 flags, int frame_width,
+		int frame_height, int start_h, int start_v)
 {
 	int priority = 0;
 	int notify = 1;
 	int depth = fmt->depth;
 	int channel, next_chan;
+	struct v4l2_rect rect = *c_rect;
 	int stride;
-	int height = c_rect->height;
 	struct vpdma_dtd *dtd;
 
 	channel = next_chan = chan_info[chan].num;
 
 	if (fmt->type == VPDMA_DATA_FMT_TYPE_YUV &&
 			fmt->data_type == DATA_TYPE_C420) {
-		height >>= 1;
-		frame_height >>= 1;
+		rect.height >>= 1;
+		rect.top >>= 1;
 		depth = 8;
 	}
 
-	stride = ALIGN((depth * c_rect->width) >> 3, VPDMA_STRIDE_ALIGN);
-	dma_addr += (c_rect->left * depth) >> 3;
+	stride = ALIGN((depth * width) >> 3, VPDMA_STRIDE_ALIGN);
+
+	dma_addr += rect.top * stride + (rect.left * depth >> 3);
 
 	dtd = list->next;
 	WARN_ON((void *)(dtd + 1) > (list->buf.addr + list->buf.size));
@@ -701,13 +732,14 @@ void vpdma_add_in_dtd(struct vpdma_desc_list *list, int frame_width,
 					!!(flags & VPDMA_DATA_ODD_LINE_SKIP),
 					stride);
 
-	dtd->xfer_length_height = dtd_xfer_length_height(c_rect->width, height);
+	dtd->xfer_length_height = dtd_xfer_length_height(rect.width,
+					rect.height);
 	dtd->start_addr = (u32) dma_addr;
 	dtd->pkt_ctl = dtd_pkt_ctl(!!(flags & VPDMA_DATA_MODE_TILED),
 				DTD_DIR_IN, channel, priority, next_chan);
 	dtd->frame_width_height = dtd_frame_width_height(frame_width,
 					frame_height);
-	dtd->start_h_v = dtd_start_h_v(c_rect->left, c_rect->top);
+	dtd->start_h_v = dtd_start_h_v(start_h, start_v);
 	dtd->client_attr0 = 0;
 	dtd->client_attr1 = 0;