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Blackfin SPI Driver: tweak magic spi dma sequence to get it working on BF54x

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Without this change, SPI DMA is not reliably under stress tests.
Obiviously it's a hardware issue which is not addressed by any document.

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Frysinger 2009-04-06 19:00:43 -07:00 committed by Linus Torvalds
parent aaaf939c57
commit a963ea83b3
1 changed files with 2 additions and 1 deletions
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3
drivers/spi/spi_bfin5xx.c
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@ -862,8 +862,9 @@ static void pump_transfers(unsigned long data)
set_dma_start_addr(drv_data->dma_channel, dma_start_addr); set_dma_start_addr(drv_data->dma_channel, dma_start_addr);
set_dma_config(drv_data->dma_channel, dma_config); set_dma_config(drv_data->dma_channel, dma_config);
local_irq_save(flags); local_irq_save(flags);
enable_dma(drv_data->dma_channel); SSYNC();
write_CTRL(drv_data, cr); write_CTRL(drv_data, cr);
enable_dma(drv_data->dma_channel);
dma_enable_irq(drv_data->dma_channel); dma_enable_irq(drv_data->dma_channel);
local_irq_restore(flags); local_irq_restore(flags);