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| author | Mike Frysinger <vapier.adi@gmail.com> | 2009-04-07 04:00:43 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-07 17:31:06 +0200 |
| commit | a963ea83b316b0a3ebf1c7118a6c36b5cd334bb6 (patch) | |
| tree | b714ae44ada54cd56813cc773f5181e153df5efd /drivers/spi/spi_bfin5xx.c | |
| parent | Blackfin SPI Driver: add timeout while waiting for SPIF in dma irq handler (diff) | |
| download | linux-a963ea83b316b0a3ebf1c7118a6c36b5cd334bb6.tar.xz linux-a963ea83b316b0a3ebf1c7118a6c36b5cd334bb6.zip | |
Blackfin SPI Driver: tweak magic spi dma sequence to get it working on BF54x
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>
Diffstat (limited to '')
| -rw-r--r-- | drivers/spi/spi_bfin5xx.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c index e706de1d10c8..317731a9cd6d 100644 --- a/drivers/spi/spi_bfin5xx.c +++ b/drivers/spi/spi_bfin5xx.c @@ -862,8 +862,9 @@ static void pump_transfers(unsigned long data) set_dma_start_addr(drv_data->dma_channel, dma_start_addr); set_dma_config(drv_data->dma_channel, dma_config); local_irq_save(flags); - enable_dma(drv_data->dma_channel); + SSYNC(); write_CTRL(drv_data, cr); + enable_dma(drv_data->dma_channel); dma_enable_irq(drv_data->dma_channel); local_irq_restore(flags); |