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dmaengine: dw: Set DMA device max segment size parameter

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Maximum block size DW DMAC configuration corresponds to the max segment
size DMA parameter in the DMA core subsystem notation. Lets set it with a
value specific to the probed DW DMA controller. It shall help the DMA
clients to create size-optimized SG-list items for the controller. This in
turn will cause less dw_desc allocations, less LLP reinitializations,
better DMA device performance.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200723005848.31907-8-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Serge Semin 2020-07-23 03:58:45 +03:00 committed by Vinod Koul
parent ef3e515a87
commit e6fe576796
1 changed files with 7 additions and 0 deletions
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7
drivers/dma/dw/core.c
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@ -1229,6 +1229,13 @@ int do_dma_probe(struct dw_dma_chip *chip)
BIT(DMA_MEM_TO_MEM);
dw->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
/*
* For now there is no hardware with non uniform maximum block size
* across all of the device channels, so we set the maximum segment
* size as the block size found for the very first channel.
*/
dma_set_max_seg_size(dw->dma.dev, dw->chan[0].block_size);
err = dma_async_device_register(&dw->dma);
if (err)
goto err_dma_register;