diff options
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/mxs_spi.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/spi/mxs_spi.c b/drivers/spi/mxs_spi.c index 168dbe4..c399707 100644 --- a/drivers/spi/mxs_spi.c +++ b/drivers/spi/mxs_spi.c @@ -224,6 +224,7 @@ static int mxs_spi_xfer_dma(struct mxs_spi_slave *slave, struct mxs_dma_desc *dp; uint32_t ctrl0; uint32_t cache_data_count; + const uint32_t dstart = (uint32_t)data; int dmach; int tl; @@ -246,10 +247,12 @@ static int mxs_spi_xfer_dma(struct mxs_spi_slave *slave, else cache_data_count = length; + /* Flush data to DRAM so DMA can pick them up */ if (write) - /* Flush data to DRAM so DMA can pick them up */ - flush_dcache_range((uint32_t)data, - (uint32_t)(data + cache_data_count)); + flush_dcache_range(dstart, dstart + cache_data_count); + + /* Invalidate the area, so no writeback into the RAM races with DMA */ + invalidate_dcache_range(dstart, dstart + cache_data_count); dmach = MXS_DMA_CHANNEL_AHB_APBH_SSP0 + slave->slave.bus; @@ -310,10 +313,8 @@ static int mxs_spi_xfer_dma(struct mxs_spi_slave *slave, return -EINVAL; /* The data arrived into DRAM, invalidate cache over them */ - if (!write) { - invalidate_dcache_range((uint32_t)data, - (uint32_t)(data + cache_data_count)); - } + if (!write) + invalidate_dcache_range(dstart, dstart + cache_data_count); return 0; } |