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  1. 18 Aug, 2015 5 commits
  3. 17 Aug, 2015 20 commits
  5. 06 Aug, 2015 4 commits
  7. 05 Aug, 2015 3 commits
    • Maxime Ripard's avatar
      dmaengine: Add an enum for the dmaengine alignment constraints · 77a68e56
      Maxime Ripard authored 
      Most drivers need to set constraints on the buffer alignment for async tx
operations. However, even though it is documented, some drivers either use
a defined constant that is not matching what the alignment variable expects
(like DMA_BUSWIDTH_* constants) or fill the alignment in bytes instead of
power of two.

Add a new enum for these alignments that matches what the framework
expects, and convert the drivers to it.
Signed-off-by: default avatarMaxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
      77a68e56
    • Geert Uytterhoeven's avatar
      dmaengine: shdma: Make dummy shdma_chan_filter() always return false · 056f6c87
      Geert Uytterhoeven authored 
      If CONFIG_SH_DMAE_BASE (which is required for DMA engine support for
legacy SH, SH/R-Mobile, and R-Car Gen1, but not for R-Car Gen2) is not
enabled, but CONFIG_RCAR_DMAC (for R-Car Gen2 DMA engine support) is,
and the DTS doesn't provide a "dmas" property for a device,
dma_request_slave_channel_compat() incorrectly succeeds, and returns a
DMA channel.

However, when trying to use that DMA channel later, it fails with:

    rcar-dmac e6700000.dma-controller: rcar_dmac_prep_slave_sg: bad parameter: len=1, id=-22

(Fortunately most drivers can handle this failure, and fall back to
PIO)

The reason for this is that a NULL legacy filter function is used, which
actually means "all channels are OK", not "do not match".
If CONFIG_SH_DMAE_BASE is enabled (like in shmobile_defconfig, which
supports other SoCs besides R-Car Gen2), shdma_chan_filter() correctly
returns false, as no available channel on R-Car Gen2 matches a
shdma-base channel.
If the DTS does provide a "dmas" property, dma_request_slave_channel()
succeeds, and legacy filter-based matching is not used.

To fix this, change shdma_chan_filter from being NULL to a dummy
function that always returns false, like is done on other platforms.
Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
      056f6c87
    • Shengjiu Wang's avatar
      dmaengine: imx-sdma: Add device to device support · 8391ecf4
      Shengjiu Wang authored 
      This patch adds DEV_TO_DEV support for i.MX SDMA driver to support data
transfer between two peripheral FIFOs.
The per_2_per script requires two peripheral addresses and two DMA
requests, and it need to check the src addr and dst addr is in the SPBA
bus space or in the AIPS bus space.
Signed-off-by: default avatarShengjiu Wang <shengjiu.wang@freescale.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
      8391ecf4
  9. 16 Jul, 2015 4 commits
  11. 07 Jul, 2015 3 commits
  13. 06 Jul, 2015 1 commit
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