From a963ea83b316b0a3ebf1c7118a6c36b5cd334bb6 Mon Sep 17 00:00:00 2001 From: Mike Frysinger Date: Mon, 6 Apr 2009 19:00:43 -0700 Subject: [PATCH] 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 Signed-off-by: Bryan Wu Cc: David Brownell Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/spi/spi_bfin5xx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c index e706de1d10c..317731a9cd6 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); -- 2.20.1