[PATCH 6/7] v4l: ti-vpe: Fix some params in VPE data descriptors

[Archit Taneja <archit@ti.com>]

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 removed since cropping isn't possible for outbound data, and 'width'
  is added to calculate the line stride.

Signed-off-by: Archit Taneja <archit@ti.com>
---
 drivers/media/platform/ti-vpe/vpdma.c | 50 ++++++++++++++++++++++++++---------
 drivers/media/platform/ti-vpe/vpdma.h |  9 ++++---
 drivers/media/platform/ti-vpe/vpe.c   | 16 +++++++----
 3 files changed, 53 insertions(+), 22 deletions(-)

diff --git a/drivers/media/platform/ti-vpe/vpdma.c b/drivers/media/platform/ti-vpe/vpdma.c
index 73dd38e..7248f16 100644
--- a/drivers/media/platform/ti-vpe/vpdma.c
+++ b/drivers/media/platform/ti-vpe/vpdma.c
@@ -614,8 +614,15 @@ 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
+ * @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 vpdma_data_format *fmt, dma_addr_t dma_addr,
 		enum vpdma_channel chan, u32 flags)
 {
@@ -633,8 +640,7 @@ void vpdma_add_out_dtd(struct vpdma_desc_list *list, struct v4l2_rect *c_rect,
 			fmt->data_type == DATA_TYPE_C420)
 		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);
 
 	dtd = list->next;
 	WARN_ON((void *)(dtd + 1) > (list->buf.addr + list->buf.size));
@@ -664,31 +670,48 @@ 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 +724,14 @@ 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;
 
diff --git a/drivers/media/platform/ti-vpe/vpdma.h b/drivers/media/platform/ti-vpe/vpdma.h
index bf5f8bb..850c8d5 100644
--- a/drivers/media/platform/ti-vpe/vpdma.h
+++ b/drivers/media/platform/ti-vpe/vpdma.h
@@ -186,13 +186,14 @@ void vpdma_add_cfd_adb(struct vpdma_desc_list *list, int client,
 		struct vpdma_buf *adb);
 void vpdma_add_sync_on_channel_ctd(struct vpdma_desc_list *list,
 		enum vpdma_channel chan);
-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 vpdma_data_format *fmt, dma_addr_t dma_addr,
 		enum vpdma_channel chan, u32 flags);
-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);
 
 /* vpdma list interrupt management */
 void vpdma_enable_list_complete_irq(struct vpdma_data *vpdma, int list_num,
diff --git a/drivers/media/platform/ti-vpe/vpe.c b/drivers/media/platform/ti-vpe/vpe.c
index 3a610a6..6acdcd8 100644
--- a/drivers/media/platform/ti-vpe/vpe.c
+++ b/drivers/media/platform/ti-vpe/vpe.c
@@ -986,7 +986,6 @@ static void add_out_dtd(struct vpe_ctx *ctx, int port)
 	struct vpe_q_data *q_data = &ctx->q_data[Q_DATA_DST];
 	const struct vpe_port_data *p_data = &port_data[port];
 	struct vb2_buffer *vb = ctx->dst_vb;
-	struct v4l2_rect *c_rect = &q_data->c_rect;
 	struct vpe_fmt *fmt = q_data->fmt;
 	const struct vpdma_data_format *vpdma_fmt;
 	int mv_buf_selector = !ctx->src_mv_buf_selector;
@@ -1015,7 +1014,7 @@ static void add_out_dtd(struct vpe_ctx *ctx, int port)
 	if (q_data->flags & Q_DATA_MODE_TILED)
 		flags |= VPDMA_DATA_MODE_TILED;
 
-	vpdma_add_out_dtd(&ctx->desc_list, c_rect, vpdma_fmt, dma_addr,
+	vpdma_add_out_dtd(&ctx->desc_list, q_data->width, vpdma_fmt, dma_addr,
 		p_data->channel, flags);
 }
 
@@ -1024,11 +1023,11 @@ static void add_in_dtd(struct vpe_ctx *ctx, int port)
 	struct vpe_q_data *q_data = &ctx->q_data[Q_DATA_SRC];
 	const struct vpe_port_data *p_data = &port_data[port];
 	struct vb2_buffer *vb = ctx->src_vbs[p_data->vb_index];
-	struct v4l2_rect *c_rect = &q_data->c_rect;
 	struct vpe_fmt *fmt = q_data->fmt;
 	const struct vpdma_data_format *vpdma_fmt;
 	int mv_buf_selector = ctx->src_mv_buf_selector;
 	int field = vb->v4l2_buf.field == V4L2_FIELD_BOTTOM;
+	int frame_width, frame_height;
 	dma_addr_t dma_addr;
 	u32 flags = 0;
 
@@ -1055,8 +1054,15 @@ static void add_in_dtd(struct vpe_ctx *ctx, int port)
 	if (q_data->flags & Q_DATA_MODE_TILED)
 		flags |= VPDMA_DATA_MODE_TILED;
 
-	vpdma_add_in_dtd(&ctx->desc_list, q_data->width, q_data->height,
-		c_rect, vpdma_fmt, dma_addr, p_data->channel, field, flags);
+	frame_width = q_data->c_rect.width;
+	frame_height = q_data->c_rect.height;
+
+	if (p_data->vb_part && fmt->fourcc == V4L2_PIX_FMT_NV12)
+		frame_height /= 2;
+
+	vpdma_add_in_dtd(&ctx->desc_list, q_data->width, &q_data->c_rect,
+		vpdma_fmt, dma_addr, p_data->channel, field, flags, frame_width,
+		frame_height, 0, 0);
 }
 
 /*
-- 
1.8.3.2