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>

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);