diff options
author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2008-12-13 09:12:51 +0000 |
---|---|---|
committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-12-13 09:12:51 +0000 |
commit | 72aaf09fda49f5919d98d65d35e5179f3acb0497 (patch) | |
tree | 5fd25748f7f5640f8ee8efb86ddca88d12840791 /drivers/spi/au1550_spi.c | |
parent | 67fbc2312312095acc2f19a0b601bac10f84cf9d (diff) | |
parent | 58c2467355ed3154a12ee49d8f8236547145c9d3 (diff) |
Merge git://git.marvell.com/orion into devel
Diffstat (limited to 'drivers/spi/au1550_spi.c')
-rw-r--r-- | drivers/spi/au1550_spi.c | 26 |
1 files changed, 16 insertions, 10 deletions
diff --git a/drivers/spi/au1550_spi.c b/drivers/spi/au1550_spi.c index 87b73e0169c..b02f25c702f 100644 --- a/drivers/spi/au1550_spi.c +++ b/drivers/spi/au1550_spi.c @@ -369,10 +369,23 @@ static int au1550_spi_dma_txrxb(struct spi_device *spi, struct spi_transfer *t) dma_rx_addr = t->rx_dma; /* - * check if buffers are already dma mapped, map them otherwise + * check if buffers are already dma mapped, map them otherwise: + * - first map the TX buffer, so cache data gets written to memory + * - then map the RX buffer, so that cache entries (with + * soon-to-be-stale data) get removed * use rx buffer in place of tx if tx buffer was not provided * use temp rx buffer (preallocated or realloc to fit) for rx dma */ + if (t->tx_buf) { + if (t->tx_dma == 0) { /* if DMA_ADDR_INVALID, map it */ + dma_tx_addr = dma_map_single(hw->dev, + (void *)t->tx_buf, + t->len, DMA_TO_DEVICE); + if (dma_mapping_error(hw->dev, dma_tx_addr)) + dev_err(hw->dev, "tx dma map error\n"); + } + } + if (t->rx_buf) { if (t->rx_dma == 0) { /* if DMA_ADDR_INVALID, map it */ dma_rx_addr = dma_map_single(hw->dev, @@ -396,15 +409,8 @@ static int au1550_spi_dma_txrxb(struct spi_device *spi, struct spi_transfer *t) dma_sync_single_for_device(hw->dev, dma_rx_addr, t->len, DMA_FROM_DEVICE); } - if (t->tx_buf) { - if (t->tx_dma == 0) { /* if DMA_ADDR_INVALID, map it */ - dma_tx_addr = dma_map_single(hw->dev, - (void *)t->tx_buf, - t->len, DMA_TO_DEVICE); - if (dma_mapping_error(hw->dev, dma_tx_addr)) - dev_err(hw->dev, "tx dma map error\n"); - } - } else { + + if (!t->tx_buf) { dma_sync_single_for_device(hw->dev, dma_rx_addr, t->len, DMA_BIDIRECTIONAL); hw->tx = hw->rx; |