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authorGuennadi Liakhovetski <g.liakhovetski@gmx.de>2009-03-31 02:44:22 -0400
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-04-06 20:43:46 -0400
commitae7410e712b33d32337df80f71f702d12a8ebb81 (patch)
treec42fdc07d694d685b74ecc061d4b8080e392f78c /drivers/media/video/pxa_camera.c
parent8c62e221c71a0240f16ea8aa29609f93a68c2ff9 (diff)
V4L/DVB (11323): pxa-camera: simplify the .buf_queue path by merging two loops
pxa_dma_update_sg_tail() is called only once, runs exactly the same loop as the caller and has to recalculate the last element in an sg-list, that the caller has already calculated. Eliminate redundancy by merging the two loops and re-using the calculated pointer. This also saves a bit of performance which is always good during video-capture. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Acked-by: Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/pxa_camera.c')
-rw-r--r--drivers/media/video/pxa_camera.c20
1 files changed, 6 insertions, 14 deletions
diff --git a/drivers/media/video/pxa_camera.c b/drivers/media/video/pxa_camera.c
index cfa113cedd3e..c639845460ff 100644
--- a/drivers/media/video/pxa_camera.c
+++ b/drivers/media/video/pxa_camera.c
@@ -566,15 +566,6 @@ static void pxa_dma_stop_channels(struct pxa_camera_dev *pcdev)
566 } 566 }
567} 567}
568 568
569static void pxa_dma_update_sg_tail(struct pxa_camera_dev *pcdev,
570 struct pxa_buffer *buf)
571{
572 int i;
573
574 for (i = 0; i < pcdev->channels; i++)
575 pcdev->sg_tail[i] = buf->dmas[i].sg_cpu + buf->dmas[i].sglen;
576}
577
578static void pxa_dma_add_tail_buf(struct pxa_camera_dev *pcdev, 569static void pxa_dma_add_tail_buf(struct pxa_camera_dev *pcdev,
579 struct pxa_buffer *buf) 570 struct pxa_buffer *buf)
580{ 571{
@@ -585,12 +576,13 @@ static void pxa_dma_add_tail_buf(struct pxa_camera_dev *pcdev,
585 buf_last_desc = buf->dmas[i].sg_cpu + buf->dmas[i].sglen; 576 buf_last_desc = buf->dmas[i].sg_cpu + buf->dmas[i].sglen;
586 buf_last_desc->ddadr = DDADR_STOP; 577 buf_last_desc->ddadr = DDADR_STOP;
587 578
588 if (!pcdev->sg_tail[i]) 579 if (pcdev->sg_tail[i])
589 continue; 580 /* Link the new buffer to the old tail */
590 pcdev->sg_tail[i]->ddadr = buf->dmas[i].sg_dma; 581 pcdev->sg_tail[i]->ddadr = buf->dmas[i].sg_dma;
591 }
592 582
593 pxa_dma_update_sg_tail(pcdev, buf); 583 /* Update the channel tail */
584 pcdev->sg_tail[i] = buf_last_desc;
585 }
594} 586}
595 587
596/** 588/**