diff options
author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2011-04-18 12:12:14 -0400 |
---|---|---|
committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2011-04-18 12:12:14 -0400 |
commit | fac56c2df51bc29b07b3c2dcfabf32a015a0522c (patch) | |
tree | 1ff5d84ecf4ea0bcbd42e2ef9624b5ade3810890 /Documentation/video4linux/pxa_camera.txt | |
parent | 6caa15d0b84d2ea688fd31f4f172c8353463e109 (diff) | |
parent | a6360dd37e1a144ed11e6548371bade559a1e4df (diff) |
Merge commit 'v2.6.39-rc3' into for-2.6.39
Diffstat (limited to 'Documentation/video4linux/pxa_camera.txt')
-rw-r--r-- | Documentation/video4linux/pxa_camera.txt | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/Documentation/video4linux/pxa_camera.txt b/Documentation/video4linux/pxa_camera.txt index 4f6d0ca01956..51ed1578b0e8 100644 --- a/Documentation/video4linux/pxa_camera.txt +++ b/Documentation/video4linux/pxa_camera.txt | |||
@@ -84,12 +84,12 @@ DMA usage | |||
84 | transfer is not started. On "End Of Frame" interrupt, the irq handler | 84 | transfer is not started. On "End Of Frame" interrupt, the irq handler |
85 | starts the DMA chain. | 85 | starts the DMA chain. |
86 | - capture of one videobuffer | 86 | - capture of one videobuffer |
87 | The DMA chain starts transfering data into videobuffer RAM pages. | 87 | The DMA chain starts transferring data into videobuffer RAM pages. |
88 | When all pages are transfered, the DMA irq is raised on "ENDINTR" status | 88 | When all pages are transferred, the DMA irq is raised on "ENDINTR" status |
89 | - finishing one videobuffer | 89 | - finishing one videobuffer |
90 | The DMA irq handler marks the videobuffer as "done", and removes it from | 90 | The DMA irq handler marks the videobuffer as "done", and removes it from |
91 | the active running queue | 91 | the active running queue |
92 | Meanwhile, the next videobuffer (if there is one), is transfered by DMA | 92 | Meanwhile, the next videobuffer (if there is one), is transferred by DMA |
93 | - finishing the last videobuffer | 93 | - finishing the last videobuffer |
94 | On the DMA irq of the last videobuffer, the QCI is stopped. | 94 | On the DMA irq of the last videobuffer, the QCI is stopped. |
95 | 95 | ||
@@ -101,7 +101,7 @@ DMA usage | |||
101 | 101 | ||
102 | This structure is pointed by dma->sg_cpu. | 102 | This structure is pointed by dma->sg_cpu. |
103 | The descriptors are used as follows : | 103 | The descriptors are used as follows : |
104 | - desc-sg[i]: i-th descriptor, transfering the i-th sg | 104 | - desc-sg[i]: i-th descriptor, transferring the i-th sg |
105 | element to the video buffer scatter gather | 105 | element to the video buffer scatter gather |
106 | - finisher: has ddadr=DADDR_STOP, dcmd=ENDIRQEN | 106 | - finisher: has ddadr=DADDR_STOP, dcmd=ENDIRQEN |
107 | - linker: has ddadr= desc-sg[0] of next video buffer, dcmd=0 | 107 | - linker: has ddadr= desc-sg[0] of next video buffer, dcmd=0 |