Hi, This patchset contains two groups of improvements: * Add support for frame (zero-copy) DMA mode, and also scatter-gather DMA mode. * Audio improvements: prevent hw param changes, and allow period size configuration. The DMA modes are selected at module insertion time, through a module parameter called dma_mode. While it should be theoretically possible to switch this at runtime, I believe the complexity involved does not worth the benefit: users will be interested in some specific use case, and thus will set the DMA mode right from the start. Note that in scatter-gather mode, only V4L2_FIELD_SEQ_TB is possible. As far as I can see, in this DMA mode, the device delivers a sequential top-bottom field frame, and cannot deliver separate top/bottom frames. The only sane thing we can do is limit the DMA length and get a top (or bottom field), but I doubt that's useful for anyone. Then again, any additional support can be done as follow up patches. For instance, the current series does not add support for the "FIELD" mode provided by the device. The reason for this is that it looked quite complex, and required a lot of changes. I'd really like to avoid adding any complexity until we have some users demanding it. Series based on v4.6-rc1, plus patch "media: Support Intersil/Techwell TW686x-based video capture cards" (https://patchwork.linuxtv.org/patch/33546/) Ezequiel Garcia (7): tw686x: Specify that the DMA is 32 bits tw686x: Introduce an interface to support multiple DMA modes tw686x: Add support for DMA contiguous interlaced frame mode tw686x: Add support for DMA scatter-gather mode tw686x: audio: Implement non-memcpy capture tw686x: audio: Allow to configure the period size tw686x: audio: Prevent hw param changes while busy drivers/media/pci/tw686x/Kconfig | 2 + drivers/media/pci/tw686x/tw686x-audio.c | 92 ++++-- drivers/media/pci/tw686x/tw686x-core.c | 56 +++- drivers/media/pci/tw686x/tw686x-regs.h | 9 + drivers/media/pci/tw686x/tw686x-video.c | 493 +++++++++++++++++++++++++------- drivers/media/pci/tw686x/tw686x.h | 41 ++- 6 files changed, 545 insertions(+), 148 deletions(-) -- 2.7.0 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
