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| author | Serge Semin <Sergey.Semin@baikalelectronics.ru> | 2020-07-23 03:58:41 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2020-07-27 12:00:54 +0300 |
| commit | d97758e048e5fe91c7d8ff9ce5f030ee88d92161 (patch) | |
| tree | 3d2940d352db676fec5e8251a7b3c85a0bcb939e /include/linux | |
| parent | 2e7d74214d03b40e4ca123b834f189b08e40a6b7 (diff) | |
| download | linux-d97758e048e5fe91c7d8ff9ce5f030ee88d92161.tar.xz | |
dmaengine: Introduce min burst length capability
Some hardware aside from default 0/1 may have greater minimum burst
transactions length constraints. Here we introduce the DMA device
and slave capability, which if required can be initialized by the DMA
engine driver with the device-specific value.
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200723005848.31907-4-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/dmaengine.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 883e1e087de5..7d6e2aa26980 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -467,6 +467,7 @@ enum dma_residue_granularity { * Since the enum dma_transfer_direction is not defined as bit flag for * each type, the dma controller should set BIT(<TYPE>) and same * should be checked by controller as well + * @min_burst: min burst capability per-transfer * @max_burst: max burst capability per-transfer * @cmd_pause: true, if pause is supported (i.e. for reading residue or * for resume later) @@ -480,6 +481,7 @@ struct dma_slave_caps { u32 src_addr_widths; u32 dst_addr_widths; u32 directions; + u32 min_burst; u32 max_burst; bool cmd_pause; bool cmd_resume; @@ -771,6 +773,7 @@ struct dma_filter { * Since the enum dma_transfer_direction is not defined as bit flag for * each type, the dma controller should set BIT(<TYPE>) and same * should be checked by controller as well + * @min_burst: min burst capability per-transfer * @max_burst: max burst capability per-transfer * @residue_granularity: granularity of the transfer residue reported * by tx_status @@ -841,6 +844,7 @@ struct dma_device { u32 src_addr_widths; u32 dst_addr_widths; u32 directions; + u32 min_burst; u32 max_burst; bool descriptor_reuse; enum dma_residue_granularity residue_granularity; |