Commit 37f5aefd authored by Robert Jarzmik's avatar Robert Jarzmik Committed by Mauro Carvalho Chehab
Browse files

V4L/DVB (11320): pxa_camera: Remove YUV planar formats hole 



All planes were PAGE aligned (ie. 4096 bytes aligned). This
is not consistent with YUV422 format, which requires Y, U
and V planes glued together.  The new implementation forces
the alignement on 8 bytes (DMA requirement), which is almost
always the case (granted by width x height being a multiple
of 8).

The test cases include tests in both YUV422 and RGB565 :
 - a picture of size 111 x 111 (cross RAM pages example)
 - a picture of size 1023 x 4 in (under 1 RAM page)
 - a picture of size 1024 x 4 in (exactly 1 RAM page)
 - a picture of size 1025 x 4 in (over 1 RAM page)
 - a picture of size 1280 x 1024 (many RAM pages)

Signed-off-by: default avatarRobert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: default avatarGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 92a8337b

drivers/media/video/pxa_camera.c

+105 −38
Original line number Diff line number Diff line
@@ -287,19 +287,63 @@ static void free_buffer(struct videobuf_queue *vq, struct pxa_buffer *buf) 
	buf->vb.state = VIDEOBUF_NEEDS_INIT;

}



static int calculate_dma_sglen(struct scatterlist *sglist, int sglen,

			       int sg_first_ofs, int size)

{

	int i, offset, dma_len, xfer_len;

	struct scatterlist *sg;



	offset = sg_first_ofs;

	for_each_sg(sglist, sg, sglen, i) {

		dma_len = sg_dma_len(sg);



		/* PXA27x Developer's Manual 27.4.4.1: round up to 8 bytes */

		xfer_len = roundup(min(dma_len - offset, size), 8);



		size = max(0, size - xfer_len);

		offset = 0;

		if (size == 0)

			break;

	}



	BUG_ON(size != 0);

	return i + 1;

}



/**

 * pxa_init_dma_channel - init dma descriptors

 * @pcdev: pxa camera device

 * @buf: pxa buffer to find pxa dma channel

 * @dma: dma video buffer

 * @channel: dma channel (0 => 'Y', 1 => 'U', 2 => 'V')

 * @cibr: camera Receive Buffer Register

 * @size: bytes to transfer

 * @sg_first: first element of sg_list

 * @sg_first_ofs: offset in first element of sg_list

 *

 * Prepares the pxa dma descriptors to transfer one camera channel.

 * Beware sg_first and sg_first_ofs are both input and output parameters.

 *

 * Returns 0 or -ENOMEM if no coherent memory is available

 */

static int pxa_init_dma_channel(struct pxa_camera_dev *pcdev,

				struct pxa_buffer *buf,

				struct videobuf_dmabuf *dma, int channel,

				int sglen, int sg_start, int cibr,

				unsigned int size)

				int cibr, int size,

				struct scatterlist **sg_first, int *sg_first_ofs)

{

	struct pxa_cam_dma *pxa_dma = &buf->dmas[channel];

	int i;

	struct scatterlist *sg;

	int i, offset, sglen;

	int dma_len = 0, xfer_len = 0;



	if (pxa_dma->sg_cpu)

		dma_free_coherent(pcdev->dev, pxa_dma->sg_size,

				  pxa_dma->sg_cpu, pxa_dma->sg_dma);



	sglen = calculate_dma_sglen(*sg_first, dma->sglen,

				    *sg_first_ofs, size);



	pxa_dma->sg_size = (sglen + 1) * sizeof(struct pxa_dma_desc);

	pxa_dma->sg_cpu = dma_alloc_coherent(pcdev->dev, pxa_dma->sg_size,

					     &pxa_dma->sg_dma, GFP_KERNEL);
@@ -307,28 +351,54 @@ static int pxa_init_dma_channel(struct pxa_camera_dev *pcdev, 
		return -ENOMEM;



	pxa_dma->sglen = sglen;

	offset = *sg_first_ofs;



	for (i = 0; i < sglen; i++) {

		int sg_i = sg_start + i;

		struct scatterlist *sg = dma->sglist;

		unsigned int dma_len = sg_dma_len(&sg[sg_i]), xfer_len;

	dev_dbg(pcdev->dev, "DMA: sg_first=%p, sglen=%d, ofs=%d, dma.desc=%x\n",

		*sg_first, sglen, *sg_first_ofs, pxa_dma->sg_dma);



		pxa_dma->sg_cpu[i].dsadr = pcdev->res->start + cibr;

		pxa_dma->sg_cpu[i].dtadr = sg_dma_address(&sg[sg_i]);



	for_each_sg(*sg_first, sg, sglen, i) {

		dma_len = sg_dma_len(sg);



		/* PXA27x Developer's Manual 27.4.4.1: round up to 8 bytes */

		xfer_len = (min(dma_len, size) + 7) & ~7;

		xfer_len = roundup(min(dma_len - offset, size), 8);



		size = max(0, size - xfer_len);



		pxa_dma->sg_cpu[i].dsadr = pcdev->res->start + cibr;

		pxa_dma->sg_cpu[i].dtadr = sg_dma_address(sg) + offset;

		pxa_dma->sg_cpu[i].dcmd =

			DCMD_FLOWSRC | DCMD_BURST8 | DCMD_INCTRGADDR | xfer_len;

		size -= dma_len;

		pxa_dma->sg_cpu[i].ddadr =

			pxa_dma->sg_dma + (i + 1) * sizeof(struct pxa_dma_desc);



		dev_vdbg(pcdev->dev, "DMA: desc.%08x->@phys=0x%08x, len=%d\n",

			 pxa_dma->sg_dma + i * sizeof(struct pxa_dma_desc),

			 sg_dma_address(sg) + offset, xfer_len);

		offset = 0;



		if (size == 0)

			break;

	}



	pxa_dma->sg_cpu[sglen - 1].ddadr = DDADR_STOP;

	pxa_dma->sg_cpu[sglen - 1].dcmd |= DCMD_ENDIRQEN;



	/*

	 * Handle 1 special case :

	 *  - in 3 planes (YUV422P format), we might finish with xfer_len equal

	 *    to dma_len (end on PAGE boundary). In this case, the sg element

	 *    for next plane should be the next after the last used to store the

	 *    last scatter gather RAM page

	 */

	if (xfer_len >= dma_len) {

		*sg_first_ofs = xfer_len - dma_len;

		*sg_first = sg_next(sg);

	} else {

		*sg_first_ofs = xfer_len;

		*sg_first = sg;

	}



	return 0;

}
@@ -340,7 +410,6 @@ static int pxa_videobuf_prepare(struct videobuf_queue *vq, 
	struct pxa_camera_dev *pcdev = ici->priv;

	struct pxa_buffer *buf = container_of(vb, struct pxa_buffer, vb);

	int ret;

	int sglen_y,  sglen_yu = 0, sglen_u = 0, sglen_v = 0;

	int size_y, size_u = 0, size_v = 0;



	dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
@@ -379,39 +448,37 @@ static int pxa_videobuf_prepare(struct videobuf_queue *vq, 
	}



	if (vb->state == VIDEOBUF_NEEDS_INIT) {

		unsigned int size = vb->size;

		int size = vb->size;

		int next_ofs = 0;

		struct videobuf_dmabuf *dma = videobuf_to_dma(vb);

		struct scatterlist *sg;



		ret = videobuf_iolock(vq, vb, NULL);

		if (ret)

			goto fail;



		if (pcdev->channels == 3) {

			/* FIXME the calculations should be more precise */

			sglen_y = dma->sglen / 2;

			sglen_u = sglen_v = dma->sglen / 4 + 1;

			sglen_yu = sglen_y + sglen_u;

			size_y = size / 2;

			size_u = size_v = size / 4;

		} else {

			sglen_y = dma->sglen;

			size_y = size;

		}



		/* init DMA for Y channel */

		ret = pxa_init_dma_channel(pcdev, buf, dma, 0, sglen_y,

					   0, 0x28, size_y);

		sg = dma->sglist;



		/* init DMA for Y channel */

		ret = pxa_init_dma_channel(pcdev, buf, dma, 0, CIBR0, size_y,

					   &sg, &next_ofs);

		if (ret) {

			dev_err(pcdev->dev,

				"DMA initialization for Y/RGB failed\n");

			goto fail;

		}



		if (pcdev->channels == 3) {

		/* init DMA for U channel */

			ret = pxa_init_dma_channel(pcdev, buf, dma, 1, sglen_u,

						   sglen_y, 0x30, size_u);

		if (size_u)

			ret = pxa_init_dma_channel(pcdev, buf, dma, 1, CIBR1,

						   size_u, &sg, &next_ofs);

		if (ret) {

			dev_err(pcdev->dev,

				"DMA initialization for U failed\n");
@@ -419,14 +486,14 @@ static int pxa_videobuf_prepare(struct videobuf_queue *vq, 
		}



		/* init DMA for V channel */

			ret = pxa_init_dma_channel(pcdev, buf, dma, 2, sglen_v,

						   sglen_yu, 0x38, size_v);

		if (size_v)

			ret = pxa_init_dma_channel(pcdev, buf, dma, 2, CIBR2,

						   size_v, &sg, &next_ofs);

		if (ret) {

			dev_err(pcdev->dev,

				"DMA initialization for V failed\n");

			goto fail_v;

		}

		}



		vb->state = VIDEOBUF_PREPARED;

	}

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